On June 18, 1997, the municipality of Chongqing was officially unveiled. Since then, the city’s economic development and urban-rural development have entered the fast lane. In the 15 years under his direct jurisdiction, he has invested heavily, has many construction projects, and has rapid economic development. The investment in fixed assets increased from 31.2 billion yuan in 1997 to 900 billion yuan in 2012. The regional GNP increased from 151 billion yuan in 1997 to 11.28 billion yuan in 2012, an average annual increase of 24.90% and 15.50%, respectively. As a driving industry for cement, the city’s cement production increased from 9.71 million tons in 1997 to about 55 million tons in 2012, an average annual increase of 13.0%. The cement industry has made an indelible contribution to the smooth flow of urban and rural traffic in Chongqing, great changes in Chongqing, and changes in the living environment of production and living. The growth of Chongqing Cement with direct jurisdiction is worthy of praise.
First, large-scale elimination of outdated cement production capacity, for the development of advanced productive forces.
Due to historical reasons, in the past ten years or so, when people talked about cement companies, the scene of “smoky and black water cracking†often appeared in the minds of people. “Three highs†(high energy consumption, high consumption, and high pollution) became cement. Synonymous with industry. It is undeniable that since the implementation of the “Building Materials for Everyone†policy in 1985, the city has had the reality of “smoking in villages and setting up factories in counties and countiesâ€. These cement plants are characterized by small scale (1 to 40,000 tons), wide distribution (36 districts and counties), backward technology and equipment (Tudan kiln, machine vertical kiln, dry hollow kiln, and small wet kiln), and dust emission. many. People commented on cement factories like this: “You have to wear a hat when you go out, and you need to close the window when you enter the houseâ€; “Walk on an umbrella, eat to a bowl, and sleep to cover your faceâ€; “Sunny weather is full of ash and it's rainy and muddy.â€
After direct administration in Chongqing, under the guidance of the national government, the Chongqing municipal government issued a series of policies on the elimination of backward production capacity, and the pace of elimination has been significantly accelerated. According to incomplete statistics, from the “Ninth Five-Year Plan†to the “Eleventh Five-Year Planâ€, a total of 34 cement companies were banned, 80 cement companies were shut down, and 377 outdated cement production process lines were eliminated. A total of 14.36 million tons of outdated cement production capacity was eliminated. During the second five-year period, more than 70 cement production lines will be phased out, and 12.3 million tons of outdated cement will be eliminated. By the end of 2012, the city's shaft kiln cement production capacity at the depth of the Dashan Mountain was only about 6 million tons, and there was no doubt that the backward production capacity was withdrawn from the historical stage.
Second, large-scale adjustment of the technological structure, laying the foundation for advanced productivity to occupy the market The new dry cement kiln outside the decomposition line, is the representative of the advanced productive forces of the cement industry. Its characteristics: large scale, low energy consumption, low consumption, and low pollution. Before the municipality was directly under the jurisdiction, the city did not have a new dry process cement production line. Through the “Ninth Five-Year†exploration pilot project, the “10th Five-Year Plan†development, and the “Eleventh Five-Year Plan†strong expansion, the “Twelfth Five-Year Plan†completed the renewal construction until 2012. At the end of the year, the city's new dry process cement production line reached 55. (In which, more than 2,500 t/d of new dry process lines reached 48, accounting for 86.2% of the total capacity of all new dry process lines). The capacity of new dry process cement will reach 73 million tons, which will account for 92% of the city's total cement output. about. In addition to the "Twelfth Five-Year Plan" to curb increase, by 2015, the city's new dry process cement will reach more than 96%.
Third, large-scale management of cement business environment, for the blue sky and white clouds, green mountains and water.
With the Dongfeng, which had two production licenses for cement enterprises in 2002 and 2008, combined with the implementation of GB4915-2004 "Emission Standard of Air Pollutants for Cement Industry", the total investment for cement companies to control dust, treat flue gas and treat sewage In the case of over 1 billion yuan, the old production enterprises will not be demolished, the pollutant discharge will not be up to the standard, and the replacement of the pollutants will not be up to standard; the environmental protection acceptance of new construction enterprises will be unqualified and no measures such as emission permits and cement production permits will be issued. The internal and external environment of cement companies will occur. A fundamental change. The dust emissions of Chongqing cement companies have reached and approached the European standards; there is no wastewater discharge from the company. Cement companies sky blue, green trees become a reality. On February 8, 2012, Chongqing Daily reporter Zhang Junxing made an in-depth interview with Chongqing County Conch Cement Co., Ltd. in the “Go to the grassroots, switch to the style of work, and change the style of writing.†In what he saw and heard, he published: “Chongqing Conch The cement factory is like a garden" news report. Chongqing Conch Cement is a microcosm of the current Chongqing cement and is a true reflection of Chongqing Cement.
Fourthly, to carry out comprehensive utilization of resources on a large scale, and strive to become the vanguard of the development of circular economy. The cement enterprises in our city take advantage of the cement production technology and equipment, strive to improve the efficiency of energy use, adjust the production structure of raw materials, and develop a recycling economy. Exploring beneficially.
1. Carry out internal waste utilization within the company and realize a small cycle within the company, which can save costs and reduce emissions. (1) Recycling waste heat Use raw materials for drying and power generation to realize cost reduction and emission reduction. By the end of 2011, a total of 34 new production lines in the city's new dry-process cement companies had used waste heat to generate electricity, generating a total of 66.637 million kilowatt-hours of electricity in the year. Only this one, saving 264,200 tons of standard coal; emissions of 664,400 tons of carbon dioxide; emission reduction dioxide * 20,000 tons; NOx reduction of 10,000 tons. By the end of 2012, nine new dry process production lines will also be put into operation using waste heat power generation at 6 enterprises. By that time, the city can use the waste heat power generation production line to realize the entire waste heat power generation. Compared with traditional cement companies, modern cement companies have reduced electricity purchases by 35%.
(2) Cylindrical radiant heat recovery Increase the temperature of the waste heat power generation circulating water and increase the power generation. The utility model patent technology invented by our city's experts has won the “Utility Model Patent Certificate†(No. 1881275) issued by the government on August 10, 2011. The city has already practiced cement companies and received good results.
(3) The particulate dust recovered by the enterprise is generally used as the raw material for cement production. The recycling and recycling of waste water has become the norm.
2. Consuming industrial waste and realizing the recycling of cement companies in the industrial system, which saves both land occupation and secondary pollution.
"Solid waste is not placed on the location of resources." The consumption of industrial waste by Chongqing Cement is increasing at an annual rate of about 15%. Chongqing New Dry Cement can use calcium carbide slag to replace the raw materials, which can eliminate coal, fly ash, gypsum, tailings slag, coal gangue, steel slag, construction waste and other industrial solid wastes of thermal power plants. In 2011, cement companies have eliminated Spent 15,800 tons of waste, accounting for 60% of the city's total industrial waste.
3. The use of cement kiln to co-dispose of the waste discharged from society, to achieve a major cycle in the social system, and to build a splendid urban and rural areas can not be separated from Chongqing cement.
(1) Co-disposal of urban sludge, and solving the "Chongqing Model Creation" problem. Through exploration and experimentation, Lafarge Nanshan Plant, Diwei Plant, Chongqing Runjiang Environmental Building Material Company, Chongqing Fuhuang Cement Company, and Xiaonanhai Cement Plant have become the main forces for co-processing the sewage sludge in the main urban area. About 3 years ago, more than 130,000 tons of sewage sludge (with a water content of about 80%) have been disposed of in a coordinated manner. Created great achievements for "Chongqing Model Creation".
(2) Co-disposal of domestic garbage, cracking the "garbage siege" problem. The enterprises such as Chongqing Conch, Jidong Cement Cement Company, Huaxin Cement Fuling Company, and Oriental Hope Chongqing Cement Company have disposal technologies and experience. In addition, when constructing the new line, they are equipped with an interface for daily disposal of 200-400t/d waste. Compared with waste-to-energy power plants, cement kilns co-dispose of urban household waste, and do not involve new land acquisition, no secondary pollution, no secondary disposal of fly ash and ash residues, and safe disposal and large quantities.
(3) Co-disposal of contaminated soil, allowing the Pure Land to enter the land market. About 400,000 m3 of organic contaminated soil in Chongqing needs to be disposed of; 2.5 million m3 of site contaminated with heavy metals needs to be disposed of. A total of 3 million m3 of repairs are required to be repaired. The city's cement companies have conducted beneficial explorations. The former Chongqing Tian Chemicals Plant site has more than 30,000 tons of contaminated soil. Based on scientific evidence, the Laiwei Diwei Cement Factory, Coordinated disposal began in May 2010 and was disposed of at the end of 2011.
V. Vigorously promote technological progress, adopt new technologies and new equipment to reduce energy consumption The raw materials used in cement production are: limestone, clay, iron powder correction, raw coal (both raw materials and fuels), mixed materials, and gypsum; cement production The process is “Mining + Kiln + Grindingâ€, so it is determined that the cement production process is high energy consumption (Comparative standard coal consumption of 105-120kg per tonne of clinker; approximately 105kWh of comparable electricity per tonne of cement); High emission (cement production During the process, a large number of limestone decomposition, coal combustion, moisture evaporation of raw materials, several oxides to be calcined into cement mineral clinker, there must be a large number of waste gas production process, ancient and modern China and foreign countries are no exception. For this reason, in the process of developing new dry process cement, the design is optimized: to make the process energy-saving; in the procurement and use of equipment: to make it large-scale and reliable; for example, large-scale vertical mills and high-efficiency cages are used for raw materials. Powder classifier, cement roller combined grinding system, fourth-generation non-leakage cooling machine, high-performance high-thrust burner, waste heat power generation boiler, kiln tail high temperature fan adopts variable frequency speed control device, etc.; in management: carry out energy efficiency For benchmarking and contract energy management, the use of computer-controlled DCS system on-line monitoring, so that management and energy conservation; implementation of the national energy consumption limit standards, so that the standard energy. In 2011, the city's new dry process cement production line has a standard coal consumption of 115kg/ton per ton of cement clinker, which is higher than the original vertical shaft kiln, wet method kiln and dry method hollow kiln, and can save 45kg, 93kg, and 128kg of coal. The comprehensive energy consumption per ton cement is 97Kg, which is 28Kg, 64Kg and 88Kg less than that of the original shaft kiln, wet kiln and dry kiln.
6. Large-scale introduction of well-known brand enterprises to improve the city's cement concentration during the “Tenth Five-year Plan†period: Lafarge Ryan enters the flood season; during the “Eleventh Five-Year Plan†period: Conch, Jidong, Huaxin, Tectonic, Oriental Hopeæ¸; "12th Five-Year" opening year: China's southwest cement into the building materials. By the end of 2012, the above seven companies will have 50 million tons of production capacity, accounting for 63% of the city's total cement production capacity. The city's scale of enterprises from the average of 50,000 tons in 1997 to an average of 940,000 tons in 2012.
VII. To develop innovative design concepts for the recycling economy, Oriental hopes that Chongqing Cement will win the top spot in the country. Oriental Hope Chongqing Cement Co., Ltd. will select a 5×4800t/d cement clinker production line at the site of the Yangtze River in Champo Town, Fengdu County. With 55MW of waste heat power generation. The project is designed using five professional design institutes (civil engineering, technology, slope management, road ports, and power generation):
1. In the elevation of 100 meters between the positive and negative, on the slope of 754 acres, the design and layout of the platform is divided into 17 sections, and a 5×4800t/d production line is built, which saves over 50% of the area compared with the traditional.
2. The mine achieves the homogenization of limestone;
3. High-temperature fan, kiln exhaust fan, vertical mill circulating fan (cancelled motor) used in the firing system, waste heat steam turbine produced by the waste heat boiler is used to drive the three wind turbines, and the installed load of the clinker is reduced by 32 kW. The same cement grinding ball mill is used. Steam turbines are also used for dragging, and tons of cement reduce the installed load by 21.52k.
4. Accumulation of natural rainwater is used in the production cycle, and it is rare in China.
5. Using the 350m topography potential energy resources, limestone and sandstone are transported by 5.6km long belts. The belt conveyor runs at a speed of 3.6m/s and an operating load of 1800t/h. The feedback power generation reaches 700-900kWh/h. ,Feeding 0.4-0.5kWh/h of electricity per tonne of limestone and sandstone, also rare in China;
6. The raw material grinding adopts China's double first set of dual-drive vertical mill, and the diameter of the mill can be expanded to more than 8 meters, which is also the first choice in China.
East hopes that the innovation of the cement design concept will provide a brand new blueprint for the development of a demonstration project for the development of circular economy in the cement industry (water saving, energy saving, energy saving, and material saving). China Cement Association President Lei Qianzhi expressed his praise after visiting Eastern Hope Cement. He said that China Conch Cement is the first company to eat crabs after introducing and digesting new dry kilns outside the country's kiln; Dongfang hopes to use integrated technology for cement production, which is also the first Chinese company to eat crabs.
In the 15th year under the direct jurisdiction of the People's Government, cement was completely subverted yesterday. The “three highs†of cement are farther and farther away from us. The beautiful urban and rural areas are coexisting with Chongqing Cement and are getting closer. Our dreams will surely come true.
First, large-scale elimination of outdated cement production capacity, for the development of advanced productive forces.
Due to historical reasons, in the past ten years or so, when people talked about cement companies, the scene of “smoky and black water cracking†often appeared in the minds of people. “Three highs†(high energy consumption, high consumption, and high pollution) became cement. Synonymous with industry. It is undeniable that since the implementation of the “Building Materials for Everyone†policy in 1985, the city has had the reality of “smoking in villages and setting up factories in counties and countiesâ€. These cement plants are characterized by small scale (1 to 40,000 tons), wide distribution (36 districts and counties), backward technology and equipment (Tudan kiln, machine vertical kiln, dry hollow kiln, and small wet kiln), and dust emission. many. People commented on cement factories like this: “You have to wear a hat when you go out, and you need to close the window when you enter the houseâ€; “Walk on an umbrella, eat to a bowl, and sleep to cover your faceâ€; “Sunny weather is full of ash and it's rainy and muddy.â€
After direct administration in Chongqing, under the guidance of the national government, the Chongqing municipal government issued a series of policies on the elimination of backward production capacity, and the pace of elimination has been significantly accelerated. According to incomplete statistics, from the “Ninth Five-Year Plan†to the “Eleventh Five-Year Planâ€, a total of 34 cement companies were banned, 80 cement companies were shut down, and 377 outdated cement production process lines were eliminated. A total of 14.36 million tons of outdated cement production capacity was eliminated. During the second five-year period, more than 70 cement production lines will be phased out, and 12.3 million tons of outdated cement will be eliminated. By the end of 2012, the city's shaft kiln cement production capacity at the depth of the Dashan Mountain was only about 6 million tons, and there was no doubt that the backward production capacity was withdrawn from the historical stage.
Second, large-scale adjustment of the technological structure, laying the foundation for advanced productivity to occupy the market The new dry cement kiln outside the decomposition line, is the representative of the advanced productive forces of the cement industry. Its characteristics: large scale, low energy consumption, low consumption, and low pollution. Before the municipality was directly under the jurisdiction, the city did not have a new dry process cement production line. Through the “Ninth Five-Year†exploration pilot project, the “10th Five-Year Plan†development, and the “Eleventh Five-Year Plan†strong expansion, the “Twelfth Five-Year Plan†completed the renewal construction until 2012. At the end of the year, the city's new dry process cement production line reached 55. (In which, more than 2,500 t/d of new dry process lines reached 48, accounting for 86.2% of the total capacity of all new dry process lines). The capacity of new dry process cement will reach 73 million tons, which will account for 92% of the city's total cement output. about. In addition to the "Twelfth Five-Year Plan" to curb increase, by 2015, the city's new dry process cement will reach more than 96%.
Third, large-scale management of cement business environment, for the blue sky and white clouds, green mountains and water.
With the Dongfeng, which had two production licenses for cement enterprises in 2002 and 2008, combined with the implementation of GB4915-2004 "Emission Standard of Air Pollutants for Cement Industry", the total investment for cement companies to control dust, treat flue gas and treat sewage In the case of over 1 billion yuan, the old production enterprises will not be demolished, the pollutant discharge will not be up to the standard, and the replacement of the pollutants will not be up to standard; the environmental protection acceptance of new construction enterprises will be unqualified and no measures such as emission permits and cement production permits will be issued. The internal and external environment of cement companies will occur. A fundamental change. The dust emissions of Chongqing cement companies have reached and approached the European standards; there is no wastewater discharge from the company. Cement companies sky blue, green trees become a reality. On February 8, 2012, Chongqing Daily reporter Zhang Junxing made an in-depth interview with Chongqing County Conch Cement Co., Ltd. in the “Go to the grassroots, switch to the style of work, and change the style of writing.†In what he saw and heard, he published: “Chongqing Conch The cement factory is like a garden" news report. Chongqing Conch Cement is a microcosm of the current Chongqing cement and is a true reflection of Chongqing Cement.
Fourthly, to carry out comprehensive utilization of resources on a large scale, and strive to become the vanguard of the development of circular economy. The cement enterprises in our city take advantage of the cement production technology and equipment, strive to improve the efficiency of energy use, adjust the production structure of raw materials, and develop a recycling economy. Exploring beneficially.
1. Carry out internal waste utilization within the company and realize a small cycle within the company, which can save costs and reduce emissions. (1) Recycling waste heat Use raw materials for drying and power generation to realize cost reduction and emission reduction. By the end of 2011, a total of 34 new production lines in the city's new dry-process cement companies had used waste heat to generate electricity, generating a total of 66.637 million kilowatt-hours of electricity in the year. Only this one, saving 264,200 tons of standard coal; emissions of 664,400 tons of carbon dioxide; emission reduction dioxide * 20,000 tons; NOx reduction of 10,000 tons. By the end of 2012, nine new dry process production lines will also be put into operation using waste heat power generation at 6 enterprises. By that time, the city can use the waste heat power generation production line to realize the entire waste heat power generation. Compared with traditional cement companies, modern cement companies have reduced electricity purchases by 35%.
(2) Cylindrical radiant heat recovery Increase the temperature of the waste heat power generation circulating water and increase the power generation. The utility model patent technology invented by our city's experts has won the “Utility Model Patent Certificate†(No. 1881275) issued by the government on August 10, 2011. The city has already practiced cement companies and received good results.
(3) The particulate dust recovered by the enterprise is generally used as the raw material for cement production. The recycling and recycling of waste water has become the norm.
2. Consuming industrial waste and realizing the recycling of cement companies in the industrial system, which saves both land occupation and secondary pollution.
"Solid waste is not placed on the location of resources." The consumption of industrial waste by Chongqing Cement is increasing at an annual rate of about 15%. Chongqing New Dry Cement can use calcium carbide slag to replace the raw materials, which can eliminate coal, fly ash, gypsum, tailings slag, coal gangue, steel slag, construction waste and other industrial solid wastes of thermal power plants. In 2011, cement companies have eliminated Spent 15,800 tons of waste, accounting for 60% of the city's total industrial waste.
3. The use of cement kiln to co-dispose of the waste discharged from society, to achieve a major cycle in the social system, and to build a splendid urban and rural areas can not be separated from Chongqing cement.
(1) Co-disposal of urban sludge, and solving the "Chongqing Model Creation" problem. Through exploration and experimentation, Lafarge Nanshan Plant, Diwei Plant, Chongqing Runjiang Environmental Building Material Company, Chongqing Fuhuang Cement Company, and Xiaonanhai Cement Plant have become the main forces for co-processing the sewage sludge in the main urban area. About 3 years ago, more than 130,000 tons of sewage sludge (with a water content of about 80%) have been disposed of in a coordinated manner. Created great achievements for "Chongqing Model Creation".
(2) Co-disposal of domestic garbage, cracking the "garbage siege" problem. The enterprises such as Chongqing Conch, Jidong Cement Cement Company, Huaxin Cement Fuling Company, and Oriental Hope Chongqing Cement Company have disposal technologies and experience. In addition, when constructing the new line, they are equipped with an interface for daily disposal of 200-400t/d waste. Compared with waste-to-energy power plants, cement kilns co-dispose of urban household waste, and do not involve new land acquisition, no secondary pollution, no secondary disposal of fly ash and ash residues, and safe disposal and large quantities.
(3) Co-disposal of contaminated soil, allowing the Pure Land to enter the land market. About 400,000 m3 of organic contaminated soil in Chongqing needs to be disposed of; 2.5 million m3 of site contaminated with heavy metals needs to be disposed of. A total of 3 million m3 of repairs are required to be repaired. The city's cement companies have conducted beneficial explorations. The former Chongqing Tian Chemicals Plant site has more than 30,000 tons of contaminated soil. Based on scientific evidence, the Laiwei Diwei Cement Factory, Coordinated disposal began in May 2010 and was disposed of at the end of 2011.
V. Vigorously promote technological progress, adopt new technologies and new equipment to reduce energy consumption The raw materials used in cement production are: limestone, clay, iron powder correction, raw coal (both raw materials and fuels), mixed materials, and gypsum; cement production The process is “Mining + Kiln + Grindingâ€, so it is determined that the cement production process is high energy consumption (Comparative standard coal consumption of 105-120kg per tonne of clinker; approximately 105kWh of comparable electricity per tonne of cement); High emission (cement production During the process, a large number of limestone decomposition, coal combustion, moisture evaporation of raw materials, several oxides to be calcined into cement mineral clinker, there must be a large number of waste gas production process, ancient and modern China and foreign countries are no exception. For this reason, in the process of developing new dry process cement, the design is optimized: to make the process energy-saving; in the procurement and use of equipment: to make it large-scale and reliable; for example, large-scale vertical mills and high-efficiency cages are used for raw materials. Powder classifier, cement roller combined grinding system, fourth-generation non-leakage cooling machine, high-performance high-thrust burner, waste heat power generation boiler, kiln tail high temperature fan adopts variable frequency speed control device, etc.; in management: carry out energy efficiency For benchmarking and contract energy management, the use of computer-controlled DCS system on-line monitoring, so that management and energy conservation; implementation of the national energy consumption limit standards, so that the standard energy. In 2011, the city's new dry process cement production line has a standard coal consumption of 115kg/ton per ton of cement clinker, which is higher than the original vertical shaft kiln, wet method kiln and dry method hollow kiln, and can save 45kg, 93kg, and 128kg of coal. The comprehensive energy consumption per ton cement is 97Kg, which is 28Kg, 64Kg and 88Kg less than that of the original shaft kiln, wet kiln and dry kiln.
6. Large-scale introduction of well-known brand enterprises to improve the city's cement concentration during the “Tenth Five-year Plan†period: Lafarge Ryan enters the flood season; during the “Eleventh Five-Year Plan†period: Conch, Jidong, Huaxin, Tectonic, Oriental Hopeæ¸; "12th Five-Year" opening year: China's southwest cement into the building materials. By the end of 2012, the above seven companies will have 50 million tons of production capacity, accounting for 63% of the city's total cement production capacity. The city's scale of enterprises from the average of 50,000 tons in 1997 to an average of 940,000 tons in 2012.
VII. To develop innovative design concepts for the recycling economy, Oriental hopes that Chongqing Cement will win the top spot in the country. Oriental Hope Chongqing Cement Co., Ltd. will select a 5×4800t/d cement clinker production line at the site of the Yangtze River in Champo Town, Fengdu County. With 55MW of waste heat power generation. The project is designed using five professional design institutes (civil engineering, technology, slope management, road ports, and power generation):
1. In the elevation of 100 meters between the positive and negative, on the slope of 754 acres, the design and layout of the platform is divided into 17 sections, and a 5×4800t/d production line is built, which saves over 50% of the area compared with the traditional.
2. The mine achieves the homogenization of limestone;
3. High-temperature fan, kiln exhaust fan, vertical mill circulating fan (cancelled motor) used in the firing system, waste heat steam turbine produced by the waste heat boiler is used to drive the three wind turbines, and the installed load of the clinker is reduced by 32 kW. The same cement grinding ball mill is used. Steam turbines are also used for dragging, and tons of cement reduce the installed load by 21.52k.
4. Accumulation of natural rainwater is used in the production cycle, and it is rare in China.
5. Using the 350m topography potential energy resources, limestone and sandstone are transported by 5.6km long belts. The belt conveyor runs at a speed of 3.6m/s and an operating load of 1800t/h. The feedback power generation reaches 700-900kWh/h. ,Feeding 0.4-0.5kWh/h of electricity per tonne of limestone and sandstone, also rare in China;
6. The raw material grinding adopts China's double first set of dual-drive vertical mill, and the diameter of the mill can be expanded to more than 8 meters, which is also the first choice in China.
East hopes that the innovation of the cement design concept will provide a brand new blueprint for the development of a demonstration project for the development of circular economy in the cement industry (water saving, energy saving, energy saving, and material saving). China Cement Association President Lei Qianzhi expressed his praise after visiting Eastern Hope Cement. He said that China Conch Cement is the first company to eat crabs after introducing and digesting new dry kilns outside the country's kiln; Dongfang hopes to use integrated technology for cement production, which is also the first Chinese company to eat crabs.
In the 15th year under the direct jurisdiction of the People's Government, cement was completely subverted yesterday. The “three highs†of cement are farther and farther away from us. The beautiful urban and rural areas are coexisting with Chongqing Cement and are getting closer. Our dreams will surely come true.
Power Spring,Power Spring with Flat Coils,Large Coil Power Spring
Compression Springs ,Stampings,Extension Springs Co., Ltd. , http://www.ns-springs.com