Process method for recovering chromium and aluminum by comprehensively utilizing waste aluminum residues
A process method and waste recycling technology, which is applied in the field of recycling sodium dichromate and alumina, can solve the problems of high impurity content, affecting the quality of alumina products, etc., and achieve the effects of increasing economic benefits, easy implementation of production conditions, and protecting the environment
Inactive Publication Date: 2015-07-29
CHONGQING MINFENG CHEM
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The invention provides a process method for recovering chromium and aluminum by comprehensively utilizing waste aluminum residues, and relates to a novel method for recovering sodium chromate and aluminum oxide from industrial waste chromium-containing aluminum residues. The waste chromium-containing aluminum residues serve as a raw material and are separated with beating, water washing, electroosmosis and other processes, so that the sodium chromate solution is obtained and used for producing sodium dichromate products; the aluminum residues after dechroming processing are dissolved with a NaOH solution, and then a high-purity metallurgical grade aluminum oxide product is obtained with repeated continuous carbonation decomposition methods. With the adoption of the process method, hexavent chromium in the chromium-containing aluminum residues can be recovered, valuable metal aluminum in the aluminum residues is extracted, the qualified aluminum oxide product is produced, and meanwhile, the environment is effectively protected.
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