Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for extracting chromium from chromite ore

A chromite ore roasting technology, applied in the field of chromium extraction, can solve problems such as complex process and difficulty in realizing industrialized production

Active Publication Date: 2017-05-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the complex process existing in the existing method for extracting chromium from chromite and the defects that it is difficult to realize industrialized production, and to provide a simple and easy to realize industrialized production method for extracting chromium from chromite Methods

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment is used to illustrate the method for extracting chromium from chromite of the present invention.

[0035]50g of chromite (the content of chromium element is 26.7% by weight), 10g of sodium hydroxide and 15g of sodium sulfate were mixed, and roasted at 200°C for 90min, then heated up to 880°C, and roasted at 880°C for 90min; The roasted material is immersed in water at 60°C for 20 minutes (liquid-solid ratio is 2:1), and filtered, and the obtained filtrate is the chromium leachate, wherein the chromium leaching rate is 96.1%, and in the second roasting process No sticky lumps are produced, and only a very small amount of NaFeSiO exists in the leaching residue 4 .

Embodiment 2

[0037] This embodiment is used to illustrate the method for extracting chromium from chromite of the present invention.

[0038] 100g of chromite (the content of chromium element is 26.7% by weight), 5g of sodium hydroxide and 15g of sodium sulfate were mixed, and roasted at 500°C for 60min, then heated up to 900°C, and roasted at 900°C for 180min; The roasted material is soaked in water at 30°C for 60 minutes (the liquid-solid ratio is 3:1), and filtered, and the obtained filtrate is the leachate of chromium, wherein the leaching rate of chromium is 90%, and in the second roasting process No sticky lumps are produced, and only a very small amount of NaFeSiO exists in the leaching residue 4 .

Embodiment 3

[0040] This embodiment is used to illustrate the method for extracting chromium from chromite of the present invention.

[0041] 400g of chromite (the content of chromium element is 26.7% by weight), 320g of sodium hydroxide and 20g of sodium sulfate were mixed, and roasted at 150°C for 90min, then heated up to 800°C, and roasted at 800°C for 60min; The roasted material is immersed in water at 95°C for 30 minutes (liquid-solid ratio is 1.6:1), and filtered, and the obtained filtrate is the leachate of chromium, wherein the leaching rate of chromium is 91.5%, and in the second roasting process No sticky lumps are produced, and only a very small amount of NaFeSiO exists in the leaching residue 4 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for extracting chromium from chromite. The method comprises the following steps: roasting chromite and alkali metal hydroxide for the first time; roasting the first roasting product for the second time; and water-leaching the second roasting product, wherein the alkali metal hydroxide is potassium hydroxide and / or sodium hydroxide; the first roasting condition is as follows: the temperature is 150-695 DEG C and the time is 60-130 minutes; the second roasting condition is as follows: the temperature is 750-900 DEG C and the time is 60-180 minutes. The method for extracting chromium from chromite, provided by the invention, can be used for simply roasting, oxidizing and water-leaching chromium from chromite and extracting chromium with a high leaching efficiency. In addition, the method further facilitates continuous industrial production of extraction of chromium from chromite.

Description

technical field [0001] The invention relates to a method for extracting chromium from chromite ore. Background technique [0002] The methods for extracting chromium from chromite mainly include calcium roasting, calcium-free roasting and sub-molten salt method. Calcium roasting mainly uses lime or slaked lime-return slag as filler, or dolomite-limestone-return slag as filler; calcium-free roasting mainly uses magnesium ferrite or soda ash as filler for chromium extraction; the sub-molten salt method is With alkali as the medium, chromium is extracted in sub-molten salt state in a high-pressure reactor. Whether there is calcium or calcium-free roasting to extract chromium, the roasting process needs to be roasted at a high temperature above 1000°C; the Chinese Academy of Sciences has developed a sub-molten salt liquid phase method for extracting chromium from chromium ore. Oxygen is airtight, and the leaching time is 4 to 6 hours long. During the leaching process, impuriti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/32
Inventor 伍珍秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP