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A kind of pyrolusite pyrolysis reduction method

A technology of pyrolusite and pyrolysis, which is applied in the fields of metallurgy, solid waste treatment and chemical industry, can solve the problems of no process route patents, etc., and achieve the effects of high product added value, good application prospects and high environmental benefits

Active Publication Date: 2020-06-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the reduction of pyrolusite with ferrophosphorus as a reducing agent at home and abroad, and there is no report or patent on the relevant process route.

Method used

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  • A kind of pyrolusite pyrolysis reduction method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The pyrolusite ore (broken to -1.0mm level) with a grade of 49.6% and ferrophosphorus powder (chemical formula Fe 1.5 P, 2000 mesh, purity 98%) are mixed and ball milled according to the mass ratio of 1:0.54, and then the mixture of the two is put into the reaction furnace for heating and roasting, the roasting temperature is 800°C, the roasting time is 5 hours, and the roasting atmosphere is High-purity nitrogen (99.99%); after roasting, dilute sulfuric acid with a mass fraction of 20% is used for leaching, and the leaching rate of manganese is 94.1%.

Embodiment 2

[0033] The pyrolusite ore (broken to -1.0mm level) with a grade of 45.3% and ferrophosphorus powder (chemical formula Fe 1.5 P, 2000 mesh, purity 98%) are mixed and ball milled according to the mass ratio of 1:0.54, and then the mixture of the two is put into a reaction furnace for heating and roasting, the roasting temperature is 700°C, the roasting time is 6 hours, and the roasting atmosphere is High-purity nitrogen (99.99%); after roasting, dilute sulfuric acid with a mass fraction of 20% is used for leaching, and the leaching rate of manganese is 92.8%.

Embodiment 3

[0035] Mix pyrolusite ore with a grade of 34.6% (crushed to -1.0mm grade) and ferrophosphorus powder (chemical formula FeP, 2000 mesh, purity 98%) according to the mass ratio of 1:0.6 and ball mill, and then the mixture of the two Put it into a reaction furnace for heating and roasting, the roasting temperature is 750°C, the roasting time is 5 hours, and the roasting atmosphere is high-purity nitrogen (99.99%); after roasting, it is leached with dilute sulfuric acid with a mass fraction of 20%, and the leaching rate of manganese is 90.5% %.

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Abstract

The invention relates to a method of using a ferro-phosphorus compound as a reducing agent to conduct pyrogenic process reduction of pyrolusite. The pyrolusite is calcined at the high temperature by using the ferro-phosphorus compound as the reducing agent so as to obtain manganese oxide, and then a sulfuric acid leaching method is adopted to obtain a manganese sulfate solution. In this way, reduction of the pyrolusite is achieved, and a new method is provided for the reduction of the pyrolusite. Compared with a conventional method, the method has the advantages of being low in energy consumption, high in processing speed, good in environmental benefit and the like. Ferro-phosphorus adopted in the method can be from the chemical by-product ferro-phosphorus slag, and a large amount of ferro-phosphorus slag is generated in the phosphoric acid industry in China. By the adoption of the method, the reduction of the pyrolusite is achieved, recycling conversion and utilization of the ferro-phosphorus are achieved, and therefore the method also has the advantage of being low in cost. In addition, the method has the advantages that the technology is simple, the reaction is easy to operate,the requirement for process equipment is low, the energy consumption is low, and the method is clean, environmentally friendly and high in benefit, and is suitable for reduction leaching of the pyrolusite and recycling utilization of the ferro-phosphorus slag.

Description

technical field [0001] The invention relates to a fire reduction method of pyrolusite, in particular to a fire reduction method of pyrolusite ferrophosphorus compound, belonging to the fields of metallurgy, solid waste treatment and chemical industry. Background technique [0002] Pyrolulusite, the main component is manganese dioxide (MnO 2 ), is a major form of manganese ore. Compared with manganese carbonate, pyrolusite often has the advantages of high grade and less impurities, and is often used as a raw material for the production of manganese sulfate and electrolytic manganese in industry. Pyrolulusite is an important raw material for the production of manganese sulfate, and about 60% of manganese sulfate in the world is processed from pyrolusite. Pyrolulurite is distributed in Guizhou, Yunnan, Sichuan and other places in my country. Due to MnO 2 Insoluble in sulfuric acid, MnO 2 The primary process of ore smelting and utilization is to reduce it, and further disso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/08C22B47/00
CPCC22B1/02C22B3/08C22B47/00
Inventor 赵强闫康平王贵欣罗春晖
Owner SICHUAN UNIV