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A kind of treatment method of chromium salt mud

A treatment method and technology for chromium salts, applied in chemical instruments and methods, chromium compounds, inorganic chemistry, etc., can solve the problems of difficult trivalent chromium, high energy consumption for dry detoxification, and inability to remove chromium completely.

Active Publication Date: 2017-09-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The method for treating waste slag containing chromium in the above-mentioned prior art cannot be directly applied to chromium salt mud in chlorate plants, and the hexavalent chromium ions wrapped in the particles in the chromium salt mud are not easy to be removed, and the dry detoxification consumes a lot of energy. Secondary pollution occurs, the direct reduction method cannot completely remove chromium and other impurities are easily produced, and the leaching method is difficult to leach the trivalent chromium wrapped inside the particles. Harmless and Chromium Separation Treatment of Salt Plant Chromium Salt Sludge

Method used

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  • A kind of treatment method of chromium salt mud
  • A kind of treatment method of chromium salt mud
  • A kind of treatment method of chromium salt mud

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Experimental program
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Effect test

Embodiment approach

[0093] A processing method for chromium salt mud, comprising the following steps:

[0094] (1) Mix chromium salt mud and water at a mass volume ratio (g / mL) of 1:(2-20) and heat to 30-100°C for elution for 0.2-4 hours. After liquid-solid separation, the surface-adsorbed chromium and soluble Salt filtrate and filter residue, the filtrate is returned to the chlorate production system for recycling;

[0095] (2) Mix the filter residue obtained in step (1) with water at a mass volume ratio (g / mL) of 1:(2-20) and mix evenly, with the molar ratio of oxidant and chromium in the filter residue being (5-50):1 Add the oxidizing agent in an amount of leaching agent, mix and heat to 30-200°C for 0.5-4h to oxidize, add the leaching agent with the molar ratio of leaching agent to calcium element in the filter residue (0.5-5):1, mix and heat at 30-200°C Leach for 0.5 to 6 hours, and obtain the leach liquid and leach residue after liquid-solid separation;

[0096] (3) The leached slag obtai...

Embodiment 1

[0100] (1) Mix 40g of chromium salt mud and water at a mass volume ratio (g / mL) of 1:2 and heat to 100°C for elution for 0.2h. After liquid-solid separation, the filtrate and filter residue containing chromium adsorbed on the surface and soluble salts are obtained. The filtrate is returned to the chlorate production system for recycling;

[0101] (2) Mix the filter residue obtained in step (1) with water at a mass volume ratio (g / mL) of 1:20, add hydrogen peroxide at a molar ratio of 5:1 to the chromium element in the filter residue, mix and heat to 30 Oxidation at ℃ for 4 hours, adding potassium carbonate in the amount of potassium carbonate and calcium element in the filter residue at a molar ratio of 5:1, mixing and heating at 200℃ for 0.5h, and obtaining the leaching solution and leaching residue after liquid-solid separation;

[0102] (3) The leaching slag obtained in step (2) is washed in 5 stages to obtain dechrome tailings, the liquid-solid ratio (mL / g) of washing is 2...

Embodiment 2

[0107] (1) Mix 40g of chromium salt mud and water at a mass volume ratio (g / mL) of 1:20 and heat to 30°C for elution for 4 hours. After liquid-solid separation, the filtrate and filter residue containing chromium adsorbed on the surface and soluble salts are obtained. Return to the chlorate production system for recycling;

[0108] (2) Mix the filter residue obtained in step (1) with water at a mass volume ratio (g / mL) of 1:2, add hydrogen peroxide in an amount of 5:1 molar ratio of the chromium element in the hydrogen peroxide to the filter residue, mix and heat to 200 Oxidation at 0.5°C for 0.5h, adding sodium carbonate at a molar ratio of 0.5:1 to the calcium element in the filter residue, mixing and heating at 30°C for 6h, and obtaining the leach solution and leach residue after liquid-solid separation;

[0109] (3) The leached slag obtained in step (2) is subjected to two-stage washing to obtain dechrome tailings, the liquid-solid ratio (mL / g) of the washing is 8:1, the w...

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Abstract

The invention relates to a method for harmless treatment of chromium salt mud in a chlorate plant and a method for separation and recovery of chromium, comprising the following steps: after mixing and heating the chromium salt mud and water for elution, liquid-solid separation to obtain filtrate and filter residue; the obtained The filter residue is mixed evenly with water, then oxidized and chrome-leached, and then liquid-solid separated to obtain leachate and leach residue; the obtained leach residue is washed to obtain dechrome tailings, and the washing liquid after washing is recycled; the obtained leachate is adjusted to pH , adding a reducing agent for reductive dechroming, and then performing liquid-solid separation to obtain dechroming liquid and chromium hydroxide; the obtained dechroming liquid is subjected to crystallization and separation to obtain sulfate, and the mother liquor after crystallization and separation is recycled. The process method of the invention can realize the efficient separation and recovery of chromium in the chromium salt mud of the chlorate plant, and the dechrome tailing residue can be thoroughly detoxified. The invention has simple process, low cost and good industrial application prospect.

Description

technical field [0001] The invention belongs to the application field of hydrometallurgy and inorganic salt industry, and in particular relates to a treatment method for chromium salt mud, in particular to a harmless treatment method for chromium salt mud in a chlorate factory and a chromium separation treatment method. Background technique [0002] The composition of chromium salt mud in chlorate plant is complex, including white mud and yellow mud. Due to different production methods, the composition and phase of the two mud are quite different. The impurity content of the raw salt in the brine process is high. When the brine is refined, soda ash and caustic soda are added to precipitate calcium and magnesium ions to produce white mud whose main components are calcium carbonate, sodium chloride and a small amount of calcium sulfate, calcium chromate and sodium chromate. Sulfate ions mainly enter the process system through raw material salt. In order to make the electrolyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/00
Inventor 徐红彬张红玲张笛田颖庆朋辉裴丽丽胡应燕
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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