Chinalco's first aluminum electrolytic waste tank lining harmless processing production line successfully put into operation

On April 10th, China Aluminum's first harmless processing line for aluminum electrolytic waste tank lining was successfully put into operation in Baotou Aluminum, marking that Chinalco’s harmless treatment technology for hazardous waste generated from overhaul of aluminum electrolytic tanks has reached the domestic level. The advanced level achieves a smooth connection between the harmless treatment technology of waste aluminum sluice lining and the environmental protection industry.

On April 11, Ge Honglin, Chairman of the Board and Party Secretary of Chinalco Corporation, visited the production site of Baotou Aluminum Electrolysis Waste Tank Lining Harmless Treatment Demonstration Production Line during the mobilization meeting for the construction of major projects in Baotou City in 2017. Understand the production capacity of the production line, technical process, environmental protection indicators. He pointed out that we must attach great importance to environmental protection work, continuously strengthen the green and harmless treatment of production waste, and at the same time, we must in-depth explore and actively innovate the resource utilization of production waste, and make this work a new profit growth point for the company.

The waste tank lining removed during the overhaul of the electrolyzer after 6-8 years of operation contains fluoride and is hazardous waste. Bao Ying, director of business, Bao'an Safety, Environment and Health Department, introduced the requirements of environmental management. The hazardous waste must be temporarily stored at the site with the “three defenses” function, and a qualified unit should be entrusted with the disposal. After consultation with hazardous waste disposal units, the cost of aluminum electrolytic waste tank linings is as high as RMB 4,000 to RMB 4,000 per ton, excluding transport costs. For Baotou Aluminum, which produces an average of three to four thousand tons of overhauled slag each year, it is a significant expenditure.

At present, Baotou Aluminum has entered the track of rapid development and is making every effort to build the electrolytic aluminum industry base of Chinalco. The expansion of production capacity has made the comprehensive utilization of waste tank linings an increasingly pressing issue. To this end, based on the request of the 2015 Inner Mongolia Environmental Protection Office Overhaul Slag Management Conference, Baotou Aluminum actively explores the harmlessness of aluminum electrolytic waste tank lining on the basis of conscientiously implementing the strategic goals of China Aluminum Corporation's circular economy and cleaner production. In 2016, according to arrangements of Chinalco Corporation, Baotou Aluminum Group and China Aluminum Corporation Zhengzhou Nonferrous Metals Research Institute jointly established a technology research and development team, successfully developed a set of aluminum electrolytic waste tank lining harmless treatment technology with independent intellectual property rights. , With an investment of 15 million yuan, in the factory area of ​​Baotou Aluminium Electrolytic No. 4 Plant, the original domestic asphalt storage facility will be used to build the first state-of-the-art production line for harmless treatment of aluminum electrolysis waste tank lining, and it will officially start on October 25, 2016. Construction.

Shi Zhirong, general manager of the Zhengzhou Research Institute, told reporters that domestic research on spent slot lining started late. Electrolytic aluminum enterprises have not applied large-scale industrialization to the harmless treatment of the electrolytic cell waste slot lining. A few companies have conducted some small tests. There are two process routes for wet processing and pyroprocessing. A small number of electrolytic aluminum companies use the wet process to treat the waste tank lining. During the treatment process, only the waste refractories in the waste tank lining are treated, and the waste cathode carbon block is not completely detoxified. The “chalco-SPL” technology invented by the Zhengzhou Research Institute has conducted a comprehensive research on the waste tank lining of electrolytic cells from laboratory research to industrial testing, and has formed a mature wet processing technology. The program adopts wet process technology to classify and dispose the waste cathode and waste refractory insulation materials in the waste tank linings in a harmless manner at one time, without generating new hazardous wastes.

The construction of this project has received special attention from the leaders of Chinalco headquarters. Comrade Liu Xiangmin, a member of China Aluminum Corporation's party group, has issued instructions on many occasions, demanding that Baotou aluminum speed up the pace of construction, early completion, early production, and early results. On March 16th, Vice President of China Aluminum, Jiang Yingang, visited the project construction site in person and asked the company to implement the continuous operation of the equipment as soon as possible, and achieve the achievement of production standards.

On April 10th this year, the project was fully completed and put into operation. The designed annual production capacity will be 10,000 tons of aluminum electrolysis waste tank lining, which can fully digest the existing stock of Baotou Aluminum and the electrolytic tank waste chute lining in the future. The analysis of experimental data shows that after the detoxification treatment, the concentration of fluoride leaching in waste tank liners is 6 mg/L, which is far lower than the national standard of 100 mg/L. It belongs to Class I general solid waste, and it meets national emission standards. , It can also be used as a raw material for industrial production. It can also be used as a raw material for making brick building materials or as a raw material for road filling and backfilling. The cost of the harmless treatment of the production line is greatly reduced as compared with the outward delivery. According to estimates, the disposal fee can be saved by more than RMB 12 million a year, and the environmental and economic benefits are significant.

It is reported that based on its own energy-saving, emission-reduction and cleaner production, Baotou Aluminum continues to explore and actively innovate the resource utilization of production waste, and plans to establish a regional harmless treatment center for waste tank lining of the electrolytic cell, and to radiate Baotou City. The surrounding areas, and even electrolytic aluminum companies of Chinalco Corporation, have transformed this scientific research technology into new growth points for enterprises. We must vigorously develop a recycling economy, promote the reduction and recycling of solid waste, and achieve harmlessness and reduction. Resource management.