A kind of method that chromium phosphate prepares basic chromium sulfate

A technology of chromium sulfate and chromium phosphate, applied in the direction of chromium sulfate, etc., can solve the problems of no large-scale industrial application and no invention patent, etc., and achieve the effects of significant economic benefits, low cost, and short process

CN104609473BActive Publication Date: 2016-08-24BEIJING GENERAL RES INST OF MINING & METALLURGY +1

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: BEIJING GENERAL RES INST OF MINING & METALLURGY
Publication Date: 2016-08-24

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Abstract

The invention discloses a method for preparation of basic chromium sulfate from chromium phosphate, relates to a method for preparation of the basic chromium sulfate from chromium-containing material chromium phosphate, particularly relates to a method for extraction and separation of chromium in mixed electroplating sludge and phosphorus chromium slag to obtain chromium phosphate and then extending preparation of the basic chromium sulfate. The method is characterized by sequentially comprising the following steps: (1) adding water into a chromic phosphate raw material for mixing slurry; (2) adding a reducing agent for reducing processing; (3) adding an alkali for phosphate radical removal reaction; (4) filtering to obtain chromium hydroxide and alkali liquid; (5) redissolving the chromium hydroxide with sulfuric acid; (6) adding NaOH alkali solution into redissolving solution to adjust solution pH, aging to obtain basic chromium sulfate solution; and (7) evaporating and crystallizing to obtain basic chromium sulfate. The method is a simple-process short-flow environmentally-friendly high chromium value utilization hydrometallurgy technology, and is suitable for application in the field of resource utilization of chromium phosphate in electroplating sludge, chromium phosphate slag and waste slag sludge.

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Description

technical field

[0001] A method for preparing basic chromium sulfate from chromium phosphate, which involves preparing basic chromium sulfate from chromium phosphate from chromium-containing materials, especially after extracting and separating chromium from mixed electroplating sludge and phosphorus-chromium slag to obtain chromium phosphate, and then extending to prepare basic chromium sulfate. Chromium sulfate method. Background technique

[0002] Basic chromium sulfate is an important inorganic chemical raw material, widely used in printing and dyeing, ceramics, ink and leather industry, especially in leather industry, it is an extremely important chrome tanning agent. In the preparation process of basic chromium sulfate, there are usually glucose method, sulfur dioxide method, formaldehyde method, mixed acid method and so on.

[0003] (1) Glucose method

[0004] Basic chromium sulfate is usually prepared by reducing sodium dichromate with glucose, and the production o...

Claims

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