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Method for preparation of basic chromium sulfate from chromium phosphate

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

Active Publication Date: 2015-05-13
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] Regarding the process technology for preparing basic chromium sulfate from chromium phosphate, there is no relevant invention patent in the public literature in my country at present, and there is no report on large-scale industrial application

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  • Method for preparation of basic chromium sulfate from chromium phosphate

Examples

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Embodiment 1

[0042] Choose chromium phosphate made by extracting chromium from electroplating sludge as raw material. In a closed reaction vessel, add water to liquid to solid ratio to 3:1 (L / kg), while adding 5% sodium sulfite to maintain a reducing atmosphere to prevent Cr 3+ It is oxidized and stirred into slurry. Add NaOH lye with an initial concentration of 80g / L into a closed container, adjust the liquid-to-solid ratio to 20:1 (L / kg), control the linear stirring speed at 100 m / min, heat to 50°C, and react for 180 minutes. After filtration, an intermediate product of chromium hydroxide is obtained. The removal rate of phosphate is 93.6%. The lye contains 66g / L of NaOH, which can be recycled. The chromium hydroxide was reconstituted with 2M sulfuric acid, and kept at 80 ℃ and the linear speed of stirring was controlled at 200 m / min for 10 minutes. The pH value of the solution was adjusted to 4 with NaOH alkali. After aging for 30 minutes, the obtained basic chromium sulfate solution was ...

Embodiment 2

[0044] Choose chromium phosphate made by extracting chromium from phosphorus chromium slag as raw material. In a closed reaction vessel, add water to liquid-solid ratio to 2:1 (L / kg), and add sodium thiosulfate at a concentration of 5% to prevent reducing atmosphere. Cr 3+ It is oxidized and stirred into slurry. Add NaOH lye with an initial concentration of 250g / L into a closed container, adjust the liquid-to-solid ratio to 5:1 (L / kg), control the linear stirring speed at 400 m / min, heat to 90°C, and react for 120 minutes. After filtration, an intermediate product of chromium hydroxide is obtained. The removal rate of phosphate is 94.1%. The lye contains 222g / L NaOH, which can be recycled. The chromium hydroxide was reconstituted with 2M sulfuric acid, and kept at 80 ℃ and the linear speed of stirring was controlled at 100 m / min for 10 minutes. The pH value of the solution was adjusted to 3.5 with NaOH alkali. After aging for 30 minutes, the obtained basic chromium sulfate solu...

Embodiment 3

[0046] Choose chromium phosphate made by extracting chromium from electroplating sludge as raw material. In a pressurized closed reaction vessel, add water to liquid-solid ratio to adjust to 3:1 (L / kg), while adding 3% sodium sulfite to maintain a reducing atmosphere to prevent Cr 3+ It is oxidized and stirred into slurry. Add NaOH lye with an initial concentration of 100g / L into a closed container, adjust the liquid-to-solid ratio to 10:1 (L / kg), control the linear stirring speed at 100 m / min, heat to 180°C, and react for 60 minutes. After filtration, an intermediate product of chromium hydroxide is obtained. The removal rate of phosphate is 95.1%. The lye contains 78g / L of NaOH, which can be recycled. The chromium hydroxide was reconstituted with 2M sulfuric acid, and kept at 80 ℃ and the linear speed of stirring was controlled at 200 m / min for 10 minutes. The pH value of the solution was adjusted to 3.5 with NaOH alkali. After aging for 30 minutes, the obtained basic chromium...

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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.

Description

Technical field [0001] A method for preparing basic chromium sulfate from chromium phosphate, which involves the preparation of basic chromium sulfate from chromium phosphate from chromium-containing materials, in particular after chromium phosphate is extracted and separated from chromium in mixed electroplating sludge and phosphorus chromium slag, and then extended 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, printing ink and leather industry, especially in the 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, etc. [0003] (1) Glucose method [0004] Basic chromium sulfate is commonly produced by reducing sodium dichromate with glucose, and producing cl...

Claims

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Application Information

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IPC IPC(8): C01G37/08
Inventor 王成彦袁文辉徐志峰郭峰杨卜
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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