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Method for extracting Cr from Cr-containing material by liquid-phase oxidation

A liquid-phase oxidation and material technology, applied in the direction of chromate/dichromate, etc., can solve problems such as complex components, achieve the effect of reducing reaction temperature, reducing production cost, and accelerating reaction rate

Inactive Publication Date: 2019-03-01
HUBEI ZHENHUA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the recovery rate of chromium in this method is high, the source of caustic soda in caustic soda solid-phase roasting in this method is chromite or ferrochrome caustic soda liquid phase oxidation or three-phase oxidation completion liquid, and the composition of this solution is more complicated, except caustic soda Also contains components such as sodium chromate, sodium aluminate and sodium silicate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for extracting chromium by liquid-phase oxidation of chromium-containing materials, comprising the steps of:

[0057] (1) The raw chromium ore powder (Cr 2 o 3 Content 41wt.%), KOH (1.5 times the theoretical amount) for batching, mixing evenly, mixing uniformity ≥ 98%, mixing through abrasives so that the particle size of the material (above 90wt.%) <50μm;

[0058] (2) The mixture is subjected to microwave roasting in an oxygen-enriched atmosphere, the microwave power is 3kW, the roasting temperature is 350°C, and the roasting time is 2h;

[0059] (3) The alkali-mineral ratio is 4.5:1, the alkali concentration is 56wt%, the stirring speed is 750r / min, the temperature is 320°C, the reaction time is 3h, and the oxygen partial pressure is 0.1MPa for liquid phase leaching;

[0060] (4) Leach out the slurry for liquid-solid separation to obtain leachate and leaching slag, and Cr in the tailings obtained after the leaching slag is washed 2 o 3 The content is 3.2w...

Embodiment 2

[0062] A method for extracting chromium by liquid-phase oxidation of chromium-containing materials is the same as that of Example 1 except that the method is roasted in an oxygen-enriched atmosphere, the roasting temperature is 300° C., and the roasting time is 4 hours. Cr in tailings 2 o 3 The content is 3.7wt.%.

[0063] In addition, the calcination temperature in Example 2 was adjusted to 280°C, the Cr in tailings 2 o 3 The content is 5.2wt.%.

Embodiment 3

[0065] A method for extracting chromium by liquid-phase oxidation of chromium-containing materials is the same as that of Example 1 except that the method is roasted in an oxygen-enriched atmosphere, the roasting temperature is 550° C., and the roasting time is 0.5 h. Cr in tailings 2 o 3 The content is 3.7wt.%.

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Abstract

The invention provides a method for extracting Cr from a Cr-containing material by liquid-phase oxidation. The method comprises the steps as follows: Cr is extracted from the Cr-containing material bythe liquid-phase oxidation, and the Cr-containing material is pretreated before Cr is extracted from the Cr-containing material by the liquid-phase oxidation; the Cr-containing material and alkali are subjected to abrasive treatment and roasting in sequence. According to the method, the Cr-containing material is pretreated, so that reaction rate of Cr is increased, Cr conversion rate is increased, reaction temperature is reduced, reaction time is shortened, Cr content of leaching residues is reduced, resource utilization rate is increased, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt chromium salt production, and relates to a method for extracting chromium by liquid-phase oxidation of chromium-containing materials. Background technique [0002] The early production of chromium compounds by the caustic alkali liquid phase oxidation method using chromium-containing minerals as raw materials is mainly the NaOH molten salt liquid phase oxidation method. This method makes chromite extract chromium in NaOH molten salt. The consumption of reactants is increased, and the oxidation efficiency is improved, but the problems of high-concentration lye circulation and alkali-chromium separation have not been really solved, and the engineering implementation of this method is difficult, and no industrial application reports have been seen. [0003] The liquid-phase oxidation-dilution phase separation-carbon-ammonia cycle-sodium-alkali regeneration and other processes developed on the ...

Claims

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Application Information

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IPC IPC(8): C01G37/14
CPCC01G37/14
Inventor 庆朋辉刘静文张红玲陈小红朱光锦周飞龙徐红彬石义朗张懿蔡再华
Owner HUBEI ZHENHUA CHEMICAL CO LTD
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