METHOD FOR PROCESSING SOLID WASTES FROM SLUDGE IN ALUMINUM PRODUCTION

摘要

1. A method for processing solid wastes from sludge, comprising the steps of sludge sintering, grinding, cake leaching with water and pulp filtering, characterized in that the sludge is sintered without preliminary washing from sulfates and carbonates. 2. The method of claim 1, characterized in that the sludge is sintered at a continuous air access at 750 to 850 degree C during 20-40 minutes. 3. The method of claim 1, characterized in that the sludge is ground at 70-80 degree C with ratio solids/liquid from 1:3 to 1:5 during 30-60 minutes. 4. The method of claim 1 and 3, characterized in that the solid waste comprising cryolite and alumina is used as raw material after drying at 100-150 degree C during 30-60 minutes. 5. The method of claim 1 and 3, characterized in that a solution comprising sodium hydroaluminate is used as alkali coagulant.