According to China Aluminum Corporation's Zhongzhou branch, a few days ago, the expert group of China Aluminum Corporation's Ministry of Science and Technology organized a final acceptance check on the recycling of alumina slag and alkali industrial pilot project of Zhongzhou Branch's silicon slag.
The expert group unanimously agreed that the industrial trial flow of silicon slag firing in Zhongzhou Branch reached a design value of 30m3/h, the dissolution rate of alumina standard was between 75% and 85%, and the dissolution rate of sodium oxide was between 83% and 93%. When the production reaches the standard, the industrial testing process can be applied to industrialization.
Since the establishment of China Aluminum Corporation, the largest investment in R&D projects has been the full success of the silicon slag sintering recovery alumina and alkali industrial pilot projects.
The silicon slag sintering technology is another innovative technology that Chinalco Zhongzhou Branch Company has acquired after strengthening the sintering method, the Bayer process of beneficiation Bayer and the post-enrichment thickening and dissolution technology. Prior to this, the expert group of the China Nonferrous Metals Industry Association identified the technology. For the first time in the world, the process technology has reached the international advanced level. Its successful industrialization can further reduce the grade of the alumina ore by the sintering method and further widen the scope of use, allowing more than 90% of the alumina in the silicon slag to be recycled and used to achieve resource utilization. Maximize the thermal kiln thermal efficiency and production capacity of alumina clinker.
The silicon slag produced by the sintering process to produce alumina contains 31% of alumina and 29% of alkali. China's traditional process method is to return the silicon slag to the production process for batching and sintering to recover the alumina and alkali. However, due to The large amount of silicon contained in the silicon slag has a greater impact on the production process, making the production index difficult to control. The development of circular economy is the only way for companies to become stronger.
For this reason, the scientific research personnel of the Zhongzhou branch has made many breakthroughs and independently developed the silicon slag sintering technology to maximize the use of resources. The process innovates the sintering method, and separates the silicon slags after they are sintered separately, and finally produces the finished product alumina. The sodium oxide is recycled in the production process to recover the alumina and sodium oxide in the silicon slag, completely changing the sintering process silicon. The slag-back batching process reduces the impact on the production process, widens the sintering method and uses the ore grade, which greatly reduces the energy consumption of the process.
Since this process is still the first case in the country and there is no mature experience to be consulted, the Zhongzhou Branch has prepared a detailed test run with reference to the equipment and process characteristics of the sintering furnace, such as clinker kiln and roaster, and the equipment and process characteristics of the silicon slag sintering furnace. Basic documents such as plans, operation standards, safety plans, etc.; 4 engineering and technical personnel of the organization have discussed and demonstrated the plan for 4 consecutive times, forming a complete and systematic “Slag Slag Sintering Test Projectâ€; 8 convening conferences, special meetings, and analysis The meeting analyzed in detail the outstanding problems exposed and formulated feasible measures. The alumina plant selected 12 production backbones, deployed 6 process technicians, technicians as technical backbones, participated in the test run for the whole process, and followed the assignment for 3 months. Employees conducted technical guidance and handled small problems at any time. Major problems did not stay overnight, and the problems that occurred during the trial run were dealt with in a timely manner. In July 2007, the alumina plant shut down 3 times successively, and reformed and perfected more than 40 bottleneck points such as the cone of the calciner, the hot air pipe of the annular flue, the fluidized bed, the burner nozzle, and the soot blower. . The nozzles of the spray gun are easy to wear, and the technicians carry out on-site modification according to the use conditions, so that the service life of the nozzles is increased by 4 times.
After exploration and improvement, in late October 2007, the amount of silicon slag furnace unloading reached a design capacity of 30m3/h.
At present, the company has carried out many technical transformations on key processes that affect the process, and the silicon slag sintering has achieved continuous, stable, and high-yield operations. In February 2008, the operation rate of the silicon slag furnace reached 96%, and the discharge amount of the silicon slag furnace was stable at the production level of 31.43m3/h. The highest average throughput was 34m3/h, which exceeded the design capacity by 10%. Aluminum standard dissolved 87.74%, sodium standard dissolved 91.74%, fully exceeded the design index.
With the increase of the output and operating rate of the silicon slag furnace, the optimization of the index of the cinder clinker, the advantages of the atomization and drying cycle sintering technology have become increasingly apparent. In the first two months of 2008, under the condition that the incoming aluminum ore A/S continued to decline, the Zhongzhou Branch passed the stable operation of the silicon slag sintering furnace, the production system was highly efficient and stable, and the ratio of aluminum to silicon decreased from about 7.2 to approximately At present, around 6.0, 14,000 tons of high-aluminum ore is saved on a year-on-year basis, and the monthly ore cost is saved by more than 700,000 yuan.
According to the thermal equilibrium measurement of the silicon slag furnace, the thermal efficiency of the silicon slag furnace reaches 80.95%, which is 20% higher than that of the traditional clinker furnace. Sintered silicon slag is separately fired and dissolved, so that the alumina and alkali in the silicon slag can be recycled as much as possible. The annual output of alumina can be increased by 70,000 tons, and about 60,000 tons of alkali can be returned to the production process for recycling.
The expert group unanimously agreed that the industrial trial flow of silicon slag firing in Zhongzhou Branch reached a design value of 30m3/h, the dissolution rate of alumina standard was between 75% and 85%, and the dissolution rate of sodium oxide was between 83% and 93%. When the production reaches the standard, the industrial testing process can be applied to industrialization.
Since the establishment of China Aluminum Corporation, the largest investment in R&D projects has been the full success of the silicon slag sintering recovery alumina and alkali industrial pilot projects.
The silicon slag sintering technology is another innovative technology that Chinalco Zhongzhou Branch Company has acquired after strengthening the sintering method, the Bayer process of beneficiation Bayer and the post-enrichment thickening and dissolution technology. Prior to this, the expert group of the China Nonferrous Metals Industry Association identified the technology. For the first time in the world, the process technology has reached the international advanced level. Its successful industrialization can further reduce the grade of the alumina ore by the sintering method and further widen the scope of use, allowing more than 90% of the alumina in the silicon slag to be recycled and used to achieve resource utilization. Maximize the thermal kiln thermal efficiency and production capacity of alumina clinker.
The silicon slag produced by the sintering process to produce alumina contains 31% of alumina and 29% of alkali. China's traditional process method is to return the silicon slag to the production process for batching and sintering to recover the alumina and alkali. However, due to The large amount of silicon contained in the silicon slag has a greater impact on the production process, making the production index difficult to control. The development of circular economy is the only way for companies to become stronger.
For this reason, the scientific research personnel of the Zhongzhou branch has made many breakthroughs and independently developed the silicon slag sintering technology to maximize the use of resources. The process innovates the sintering method, and separates the silicon slags after they are sintered separately, and finally produces the finished product alumina. The sodium oxide is recycled in the production process to recover the alumina and sodium oxide in the silicon slag, completely changing the sintering process silicon. The slag-back batching process reduces the impact on the production process, widens the sintering method and uses the ore grade, which greatly reduces the energy consumption of the process.
Since this process is still the first case in the country and there is no mature experience to be consulted, the Zhongzhou Branch has prepared a detailed test run with reference to the equipment and process characteristics of the sintering furnace, such as clinker kiln and roaster, and the equipment and process characteristics of the silicon slag sintering furnace. Basic documents such as plans, operation standards, safety plans, etc.; 4 engineering and technical personnel of the organization have discussed and demonstrated the plan for 4 consecutive times, forming a complete and systematic “Slag Slag Sintering Test Projectâ€; 8 convening conferences, special meetings, and analysis The meeting analyzed in detail the outstanding problems exposed and formulated feasible measures. The alumina plant selected 12 production backbones, deployed 6 process technicians, technicians as technical backbones, participated in the test run for the whole process, and followed the assignment for 3 months. Employees conducted technical guidance and handled small problems at any time. Major problems did not stay overnight, and the problems that occurred during the trial run were dealt with in a timely manner. In July 2007, the alumina plant shut down 3 times successively, and reformed and perfected more than 40 bottleneck points such as the cone of the calciner, the hot air pipe of the annular flue, the fluidized bed, the burner nozzle, and the soot blower. . The nozzles of the spray gun are easy to wear, and the technicians carry out on-site modification according to the use conditions, so that the service life of the nozzles is increased by 4 times.
After exploration and improvement, in late October 2007, the amount of silicon slag furnace unloading reached a design capacity of 30m3/h.
At present, the company has carried out many technical transformations on key processes that affect the process, and the silicon slag sintering has achieved continuous, stable, and high-yield operations. In February 2008, the operation rate of the silicon slag furnace reached 96%, and the discharge amount of the silicon slag furnace was stable at the production level of 31.43m3/h. The highest average throughput was 34m3/h, which exceeded the design capacity by 10%. Aluminum standard dissolved 87.74%, sodium standard dissolved 91.74%, fully exceeded the design index.
With the increase of the output and operating rate of the silicon slag furnace, the optimization of the index of the cinder clinker, the advantages of the atomization and drying cycle sintering technology have become increasingly apparent. In the first two months of 2008, under the condition that the incoming aluminum ore A/S continued to decline, the Zhongzhou Branch passed the stable operation of the silicon slag sintering furnace, the production system was highly efficient and stable, and the ratio of aluminum to silicon decreased from about 7.2 to approximately At present, around 6.0, 14,000 tons of high-aluminum ore is saved on a year-on-year basis, and the monthly ore cost is saved by more than 700,000 yuan.
According to the thermal equilibrium measurement of the silicon slag furnace, the thermal efficiency of the silicon slag furnace reaches 80.95%, which is 20% higher than that of the traditional clinker furnace. Sintered silicon slag is separately fired and dissolved, so that the alumina and alkali in the silicon slag can be recycled as much as possible. The annual output of alumina can be increased by 70,000 tons, and about 60,000 tons of alkali can be returned to the production process for recycling.
Pe Xa Pipe Extrusion Line,Pex Pipe Machine,Pipe Making Machine,Pipe Extruder Machine
ZHANGJIAGANG MYHAL MACHINERY CO.,LTD , https://www.myhalmachinery.com