DEVELOPMENT STATUS OF PROCESSING TECHNOLOGY FOR SPENT POTLINING IN CHINA

摘要

With the development of Chinese aluminum industry, wastes from smelters are severely restricted by the government. Different processing technologies for spent potlining (short as SPL) have been developed in the past five years. Main SPL processing technologies are Detoxifying with limestone, coal cinder by Pyro-process, Detoxifying with bauxite in Aluminum Sintering Process and Floatation of SPL. Three typical technologies were put into industrial application in Pingguo Smelter, Shandong Smelter and Yichun Smelter, respectively. SPL plant in Pingguo which adopts Pyro-process has a capacity of 15000 metric tons per year. SPL-bauxite Sintering Process used in Shandong can treat 6000 metric tons SPL every year. Floatation of SPL was put into industrial test in Yichun this year and the test scale is 1000 metric tons SPL per year. Different products which were received from three processes can meet national standard, at the same time SPL can be sufficiently detoxified after processing.