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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

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

Method used

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  • A kind of method that chromium phosphate prepares basic chromium sulfate

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Embodiment 1

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

Embodiment 2

[0044] Choose chromium phosphate obtained by extracting chromium from phosphorous chromium slag as raw material. In a closed reaction vessel, add water to adjust the liquid-solid ratio to 2:1 (L / kg), and add sodium thiosulfate with a concentration of 5% at the same time to maintain a reducing atmosphere to prevent Cr 3+ Oxidized, stirred and pulped. Add NaOH lye with an initial concentration of 250g / L into the airtight container, adjust the liquid-solid ratio to 5:1 (L / kg), control the stirring line speed at 400 m / min, heat to 90°C, and react for 120 minutes. After filtration, the intermediate product of chromium hydroxide is obtained, the phosphate removal rate is 94.1%, and the lye contains 222g / L of NaOH, which can be recycled. Redissolve chromium hydroxide with 2M sulfuric acid, keep it warm for 10 min at 80 °C and control the stirring line speed at 100 m / min, adjust the pH value of the solution to 3.5 with NaOH alkali, and add the obtained basic chromium sulfate solution...

Embodiment 3

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

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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 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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Application Information

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Patent Type & Authority Patents(China)
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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