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 roastin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example one

[0017] Mix chromium ore: soda ash: clinker=100:65:200, and the particle size of chromium ore is less than 0.076mm, Cr 2 O 3 The content is 46.50%, the particle size of the clinker added is less than 0.2mm, and the chromium transfer rate is 98.5%. In a Φ149×2000mm rotary drum, heat to 1100°C for 35min to obtain loose powdered clinker, crush and grind to 0.2mm Hereinafter, according to the ratio of leaching liquid to solid mass ratio=1:1, leaching temperature=90℃, stirring and leaching for 10min, after liquid-solid separation, the leaching solution with sodium chromate concentration of 634g / L is obtained, and the chromium conversion rate is 99.20%.

Example Embodiment

[0018] Example two

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

Example Embodiment

[0020] Example three

[0021] Mix chromium ore: soda ash: clinker=100:75:200, in which the particle size of chromium ore is less than 0.76mm, Cr 2 O 3 The content is 53.60%, the particle size of the clinker is less than 0.2mm, and the chromium transfer rate is 99.2%. In a Φ149×2000mm rotary drum, heat to 1080℃ for 60min to obtain loose powdered clinker, crush and grind to 0.2mm Below, according to the leaching liquid-to-solid mass ratio=2:1, leaching temperature=80℃, stirring and leaching for 10min, after liquid-solid separation, the leaching liquid with a sodium chromate concentration of 346g / L is obtained, and the chromium conversion rate is 99.00%.

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PUM

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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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