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Reduction leaching method of manganese oxide ores

A technology of manganese oxide ore and manganese oxide is applied in the field of hydrometallurgical process to achieve the effects of strong reducing ability, wide source of raw materials and mild reaction conditions

Active Publication Date: 2012-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods have some deficiencies and problems in terms of product quality, reducing agent source and cost, etc., and it is necessary to research and develop a new method of reducing and leaching more efficient manganese oxide ore to meet the urgent needs of electrolytic manganese production in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The ore sample was taken from a manganese oxide mine in Yongzhou, Hunan. The main manganese mineral is pyrolusite, with a manganese grade of 20.3%, an iron grade of 10.5%, and a silica content of 37.2%. The ore is crushed to -200 mesh size.

[0024] A green tea in Xiangxi, Hunan Province was soaked in boiling water for 3 to 4 times to obtain green tea waste tea dregs, which contained 3.9% tea polyphenols, 7.9% tea polysaccharides, 12.7% cellulose, and 19.8% lignin after drying. Add ore sample and 10% (dry basis) green tea waste tea dregs in the reactor, then add water and sulfuric acid, adjust the concentration of sulfuric acid to be 1.7mol / L, and the liquid-solid ratio of the ore slurry is 7.5: 1, and stir in the reaction room at 95°C After 8 hours, manganese sulfate leaching solution was obtained, and the leaching rate of manganese was 95.5%.

Embodiment 2

[0026] The ore sample is as in Example 1, and the ore is crushed to -100 mesh size. Add ore sample and 15% (dry basis) green tea waste tea residue (composition is as shown in embodiment 1) in reactor, add water and sulfuric acid then, adjust sulfuric acid concentration to be 2.3mol / L, ore slurry liquid-solid ratio is 10 : 1, stirring the reaction room at 90° C. for 8 hours to obtain a reaction leaching solution, the leaching rate of manganese was 97.8%.

Embodiment 3

[0028] The ore sample was taken from a manganese oxide ore in Gabon, the main manganese mineral is pyrolusite, the grade of manganese is 45.6%, the grade of iron is 2.7%, and the grade of silicon dioxide is 10.8%. The ore is crushed to -200 mesh size.

[0029] Add ore sample and 40% (dry basis) green tea waste tea residue (composition is as shown in embodiment 1) in reactor, add water and sulfuric acid then, adjust sulfuric acid concentration to be 2.3mol / L, ore pulp liquid-solid ratio is 5 : 1, stirring the reaction room at 95° C. for 8 hours to obtain a reaction leaching solution, the leaching rate of manganese was 96.8%.

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Abstract

The invention relates to a reduction leaching method of manganese oxide ores. Waste and defective tea is used as a reducer to carry out reduction leaching on manganese oxide ores in a sulfuric acid water solution which serves as a medium. The leaching rate of manganese by using the method is up to more than 95%. By using waste and defective tea as the reducer, the invention has the characteristics of wide material sources, mild reaction conditions, high leaching rate of manganese and the like, and provides a new way for efficiently and comprehensively utilizing waste tea resources.

Description

[technical field] [0001] The technical field of the invention is a hydrometallurgical process, and mainly relates to a method for reducing and leaching manganese oxide ore in an aqueous sulfuric acid medium by using waste tea leaves as a reducing agent. [Background technique] [0002] As a strategic resource, manganese has an irreplaceable important position in the national economy. The output of electrolytic manganese in my country ranks first in the world. In recent years, with the decrease of high-quality manganese carbonate ore, manganese oxide ore will become the main substitute raw material for electrolytic manganese production. Research and development of efficient reduction leaching methods for manganese oxide ores is a hot topic in the field of manganese metallurgy in my country. [0003] Some studies have focused on the two-mineral leaching process using pyrite as the reducing agent. Chinese patent CN1058201 discloses a new process for the wet production of manga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/16C22B3/08C22B47/00
Inventor 钟宏李进中王帅刘广义曹占芳蒋崇文
Owner CENT SOUTH UNIV
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