Production method for extracting chromium by mixed roasting of chromium-containing material

A production method and material mixing technology, applied in the direction of improving process efficiency, etc., can solve problems such as low roasting efficiency, difficult processing, and large energy loss, so as to improve equipment utilization, solve material bonding, and increase leaching capacity. Effect

Inactive Publication Date: 2018-03-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the calcium roasting method needs to add 2 to 4 times of fillers containing calcium or magnesium. Although the technical problem of chrome ore roasting and bonding has been solved and industrialized production has been realized, the resulting chromium (Cr 6+ ) has a large amount of waste residue, is difficult to deal with, and has great environmental protection hazards. It has been gradually eliminated at present; the calcium-free roasting method that has been actively promoted in recent years is mainly roasting with chromium-extracting tailings. On the one hand, continuous and stable production of roasting has been realized. Second, the amount of waste slag containing chromium is significantly reduced, and the environmental protection benefits are obvious, but there are still problems such as long internal circulation process of tailings, high energy consumption, and low utilization rate of equipment
[0003] The patent with the publication number CN102557137B discloses a method for producing sodium chromate by three-stage calcium-free roasting to solve the problems of low roasting efficiency and large energy loss in the production of chromium salt by calcium-free roasting. , there is no large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix chrome ore: soda ash: clinker = 100:65:200, wherein the particle size of chrome ore is less than 0.076mm, Cr 2 o 3 The content is 46.50%, the particle size of added clinker is less than 0.2mm, and the chromium transfer rate is 98.5%. In a Φ149×2000mm rotary drum, it is heated to 1100°C and roasted for 35 minutes to obtain loose powdery clinker, which is crushed and ground to 0.2mm Next, stirring and leaching for 10 minutes under the conditions of leaching liquid-solid mass ratio = 1:1, leaching temperature = 90°C, after liquid-solid separation, a leaching solution with a sodium chromate concentration of 634g / L was obtained, and the chromium transfer rate was 99.20%.

Embodiment 2

[0019] Mix chrome ore: soda ash: clinker = 100:67:200, wherein the particle size of chrome ore is less than 0.076mm, Cr 2 o 3 The content is 48.00%, the particle size of the added clinker is less than 0.2mm, and the chromium transfer rate is 99%. In the Φ149×2000mm rotary drum, it is heated to 1050°C and roasted for 65min to obtain loose powdery clinker, which is crushed and ground to 0.2mm Next, according to the leaching liquid-solid mass ratio = 1.5:1, stirring and leaching under boiling conditions for 10 minutes, after liquid-solid separation, a leachate with a sodium chromate concentration of 429g / L was obtained, and the chromium transfer rate was 98.67%.

Embodiment 3

[0021] Mix chrome ore: soda ash: clinker = 100:75:200, wherein the particle size of chrome ore is less than 0.76mm, Cr 2 o 3 The content is 53.60%, the particle size of added clinker is less than 0.2mm, and the chromium transfer rate is 99.2%. In a Φ149×2000mm rotary drum, it is heated to 1080°C and roasted for 60 minutes to obtain loose powdery clinker, which is crushed and ground to 0.2mm Next, stirring and leaching for 10 minutes under the conditions of leaching liquid-solid mass ratio = 2:1, leaching temperature = 80°C, after liquid-solid separation, a leach solution with a sodium chromate concentration of 346g / L was obtained, and the chromium transfer leaching rate was 99.00%.

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Abstract

The invention discloses a production method, and particularly discloses a production method for extracting chromium by mixed roasting of a chromium-containing material, belonging to the technical field of metallurgical production process. The invention provides a production method for extracting chromium by mixed roasting of a chromium-containing material, which is simple and short in procedure, easy to implement and good in extraction effect and realizes roasting instead of sintering. According to the production method, chromium is extracted by a procedure of uniformly mixing chrome ore, sodium carbonate and clinker according to a mass ratio of 100:(50-120):(200-400), then roasting, crushing, grinding and subsequently immersing with water to obtain a sodium chromate solution, wherein theparticle diameter of ground roasted clinker does not exceed 0.2mm.

Description

technical field [0001] The invention relates to a production method, in particular to a production method for extracting chromium by mixing and roasting chromium-containing materials, and belongs to the technical field of metallurgical production technology. Background technique [0002] Chromium extraction by roasting chromium ore can be divided into calcium roasting method and calcium-free roasting method according to the type of filler added. Among them, the calcium roasting method needs to add 2 to 4 times of fillers containing calcium or magnesium. Although the technical problem of chrome ore roasting and bonding has been solved and industrialized production has been realized, the resulting chromium (Cr 6+ ) has a large amount of waste residue, is difficult to deal with, and has great environmental protection hazards. It has been gradually eliminated at present; the calcium-free roasting method that has been actively promoted in recent years is mainly roasting with chro...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B34/32
CPCC22B1/02C22B34/32Y02P10/20
Inventor 何文艺彭毅叶露申彪陈燕李明
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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