IMPROVING THE TECHNOLOGY OF WAELZATION OF ZINC CAKES
Today, about 90% of zinc in the world is produced by the hydrometallurgical method. In zinc plant of Almalyk Mining and Metallurgical Complex a mixed technology is used for zinc production: roasting – leaching – purification from impurities – electrolysis, the extraction of zinc from concentrates is 92.5-94%. The waelz process makes it possible to achieve high rates of zinc extraction, however, it has the following disadvantages: an increase in the content of chlorine, fluorine and reducing agent leads to contamination of solutions with impurities. Experiments were carried out to remove process impurities by wateralkaline washing and calcination of waelz-oxides. Washing of secondary sublimates after preliminary calcination of waelz-oxides allows to effectively solve the problem of reducing the content of reducing agent, chlorine and fluorine from the technological cycle of zinc production.
*D.B. Kholikulov, Q.M. Ruzikulov, K.R. Khaidaraliev