Method for preparing chromium hydroxide from chromium slag to co-produce mixed hydroxide of barium chloride, calcium, magnesium and aluminum

Abstract

The invention belongs to the technical field of three wastes treatment and comprehensive utilization in chromium compound manufacturing enterprises, in particular a method for preparing chromium hydroxide from chromium slag to co-produce mixed hydroxides of barium chloride, calcium, magnesium and aluminum; the invention is mainly The chromium slag is acidolyzed with hydrochloric acid and then filtered, the filtrate is settled again, and after the sedimentation liquid is separated, the filtrate and filter cake are further processed respectively to obtain chromium hydroxide and barium chloride mixed hydroxide with calcium, magnesium and aluminum; the present invention It can not only swallow the waste residue cleanly, reduce the pollution of the waste residue to the environment; but also produce valuable mixed hydroxides of chromium hydroxide and barium chloride with calcium, magnesium and aluminum, which not only have significant social and economic benefits , and the process and production equipment are simple, it is a more practical method of processing and utilization.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of three wastes in chromium compound manufacturing enterprises, in particular to a method for preparing chromium hydroxide and co-producing barium chloride, calcium, magnesium and aluminum mixed hydroxide with chromium slag. technical background [0002] The solid waste of chromium salt production mainly refers to the residue of sodium dichromate leached with water after chromite ore is roasted in the production process of sodium dichromate, commonly known as chromium slag. Chromium slag is a highly toxic and dangerous waste slag, and its appearance is yellow, black, ocher and other colors. Chromium slag often contains oxides such as calcium, magnesium, iron, aluminum, chromium trioxide, water-soluble sodium chromate, acid-soluble sodium chromate, etc. The toxicity of chromium is mainly hexavalent chromium. The toxicity of hexavalent chromium mainly comes from the corrosion and ...

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Problems solved by technology

[0012] Although the above-mentioned utilizations can dispose of the chromium slag to a certain extent, because the chromium slag is toxic and difficult to transport, its utilization has not yet opened up. When the chromium slag is processed, it is only limited to eliminating its toxicity and is not sufficient. Utilize the valuable elements contained in it; there is no relevant report on the method of co-producing barium chloride, calcium, magnesium, aluminum mixed hydroxide with chromium slag to prepare chromium hydroxide

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