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A method for separating caustic alkali and chromate in a solid mixture of caustic alkali and chromate

A solid-liquid mixture and chromate technology, applied in the field of inorganic salts, can solve the problems of high energy consumption, lower production costs, and large methanol usage, and achieve the effects of being conducive to industrial production, reducing losses, and simple processes

Active Publication Date: 2021-05-14
HUBEI ZHENHUA CHEMICAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of methanol used in this method is large, and the energy consumption in the process of recovering methanol is also large, and methanol has high requirements on the sealing of the device, which directly affects the equipment investment cost
[0007] Therefore, there is still a lack of simple and efficient separation of chromate and caustic soda while reducing production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] At 100°C, according to the liquid-solid ratio of 10:1, use a sodium chromate solution with a concentration of 55wt% to carry out two-stage countercurrent immersion of the solid mixture of sodium hydroxide and sodium chromate, and the immersion time is 2h; After completion, filter to obtain alkaline solution and sodium chromate crystals respectively.

[0045] After testing, the recovery rate of sodium hydroxide was 96%.

Embodiment 2

[0047] At 90°C, according to the liquid-solid ratio of 7:1, use a sodium chromate solution with a concentration of 45wt% to carry out three-stage countercurrent immersion of the solid mixture of sodium hydroxide and sodium chromate, and the immersion time is 1h; After completion, filter to obtain alkaline solution and sodium chromate crystals respectively.

[0048] After testing, the recovery rate of sodium hydroxide was 98%.

Embodiment 3

[0050] At 80°C, according to the liquid-solid ratio of 5:1, use a potassium chromate solution with a concentration of 35wt% to carry out 4-stage countercurrent immersion for the solid mixture of potassium hydroxide and potassium chromate, and the immersion time is 0.5h; After washing, filter to obtain alkaline solution and potassium chromate crystals respectively.

[0051] After testing, the recovery rate of potassium hydroxide was 95%.

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PUM

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Abstract

The invention relates to a method for separating caustic alkali and chromate in a solid mixture of caustic alkali and chromate. The method is as follows: using chromate solution to soak the solid mixture of caustic alkali and chromate, After the washing is completed, solid-liquid separation is performed to obtain lye and chromate solids, and the chromate in the chromate solution is the same as the chromate in the solid mixture. The invention realizes the effective separation of caustic alkali and chromate in the solid mixture of caustic alkali and chromate, obtains a solution of caustic alkali with high concentration, reduces the loss of solid phase chromate, and recovers caustic alkali Rate > 90%. The invention simultaneously reduces the energy consumption for separating the solid mixture of caustic soda and chromate, has simple process, is convenient to operate, is beneficial to industrial production, and has good application prospects.

Description

technical field [0001] The invention relates to the field of inorganic salts, in particular to a method for separating caustic alkali and chromate in a solid mixture of caustic alkali and chromate. Background technique [0002] In the processes of liquid phase (molten salt or solution) oxidation and electrochemical oxidation treatment with caustic alkali as the main medium, and pyrooxidation treatment of chromium-containing raw materials, the chromate and caustic alkali formed by the reaction form a solid phase mixture, which is used for the preparation of chromium. Chromate product or other chromium products and realize the effective recovery of caustic, need to separate the chromate and caustic in the solid phase mixture. [0003] At present, the common method for separating chromate and caustic alkali solid phase mixture is salting out crystallization method. CN101659444, CN102134098A, CN104760997A and other patents all mentioned: the solid mixture containing sodium hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D1/28C01G37/14
CPCC01D1/28C01G37/14
Inventor 庆朋辉刘静文张红玲周飞龙裴丽丽王欢徐红彬程西川张懿黄国强
Owner HUBEI ZHENHUA CHEMICAL CO LTD