Neutralization aluminum removing method for sodium chromate alkali solution

A technology of alkaline liquid and sodium chromate, applied in the fields of inorganic salt production and resource environment, can solve the problems of large impact, difficult to handle and utilize aluminum mud, difficult liquid-solid separation of leaching slurry, etc., and achieves high chromium recovery rate and easy recovery. Use and compose simple effects
CN101723461AInactive Publication Date: 2010-06-09CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2010-06-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a neutralization aluminum removing method for a sodium chromate alkali solution. The carbon dioxide is used as a neutralizer for the neutralization aluminum removal of the sodium chromate alkali solution, and a two-section neutralization method is adopted; in the first section, a neutralization pH value is controlled so that most of aluminum in the alkali solution forms and separate aluminium hydroxide sediment with thick and big particles; in the second section, the residual aluminum in the solution is completely neutralized and precipitated by continuously using the carbon dioxide, and the aluminum sediment precipitated in the second section is returned to the first section; the solution after the neutralization aluminum removal by the carbon dioxide is neutralized and acidized by a by-product chromium-contained sodium hydrogen sulfate in the production process of chromium salt, the chromium-contained sodium hydrogen sulfate is comprehensively utilized, and the trivalent chromium is recycled. The invention has the advantages of easy separation and washing of aluminum mud, low water content, low chromium band loss, easy comprehensive utilization, and the like.
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Description

technical field

[0001] The invention relates to a method for removing aluminum by using carbon dioxide to neutralize sodium chromate alkaline solution in the production process of chromium salt, and belongs to the field of inorganic salt production and resource environment. Background technique

[0002] At present, the main method of chromite production is the chromite ore oxidation roasting method, which is to oxidize and roast the mixed powder of chromite, soda ash, filler or return slag at 1100-1200 °C to convert the chromium in chromite It is water-soluble sodium chromate. The roasted clinker is leached and the leaching solution is purified to produce chromium salt. Chromite oxidation roasting method is divided into calcium roasting method and calcium-free roasting method.

[0003] During the oxidation and roasting of chromite ore, part of the aluminum compounds in chromite ore will inevitably react with sodium carbonate to form water-soluble sodium aluminate, and durin...

Claims

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