Manganese oxide mineral sulfur-based fire reduction method

A manganese oxide and mineral technology, applied in the fields of metallurgy and chemical industry, can solve the problem that rotary kilns were built in Yunnan, Hunan, Guangdong and other places in the 1980s for the reduction and roasting of pyrolusite; Yu Zhichun et al reported that Beijing Mining and Metallurgy The industrialization test results of the transformation of a manganese ore rotary kiln in Yunnan by the General Research Institute in 1985; Tan Liqun reported on the development of the National Manganese Industry Technical Committee, the high roasting temperature, and the large equipment investment, so as to reduce the reduction roasting cost, low roasting temperature, and conversion efficiency. high effect

Active Publication Date: 2010-12-15
CENT SOUTH UNIV
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Problems solved by technology

In the 1980s, domestic Yunnan, Hunan, Guangdong and other places also built rotary kilns for the reduction roasting of pyrolusite; Yu Zhichun et al. reported the industrialization test results of the transformation of a manganese ore rotary kiln in Yunnan in 1985 by Beijing General Research Institute of Mining and Metallurgy; Tan Liqun reported the electrothermal rotary reduction kiln for manganese sulfate production developed by the National Manganese Industry Technical Committee; Guangxi Chongzuo Kangmilao Chemical Company used a large rotary kiln made in Lanzhou to import high-grade pyrolusite (manganese content greater than 45%) Reduction roasting; Daxin Branch of CITIC Dameng Co., Ltd. used electric heating rotary kiln for reduction roasting of low-grade pyrolusite in 2002; Hunan Xiangxi Autonomous Prefec

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The pyrolus ore with Mn grade of 53.3% is crushed to -1.0mm particle size in advance, accounting for 80% by mass, and the sulfur-containing industrial by-product (S grade is 85%) is crushed to -1.0mm particle size, which accounts for 84% by mass %, and then mix the two evenly according to the mass ratio of 1:0.22; then put the mixture of the two into the reactor for heating and roasting, the roasting temperature is 750°C, and the roasting time is 20min; the roasted product is 20% dilute sulfuric acid Dissolution, the leaching rate of Mn is 94.6%.

Embodiment 2

[0039] Manganese oxide ore (a mixture of pyrolusite and black manganese ore) with a Mn grade of 43.5% is pre-crushed to -1.0mm particle size accounting for 85% by mass, and industrial sulfur (99% S grade) is finely ground to -1.0 The mass percentage of mm particle size is 80%, and then the two are mixed uniformly according to the mass ratio of 1:0.15; then the mixture of the two is placed in the reactor to be heated and roasted, the roasting temperature is 700 ° C, and the roasting time is 30min; the roasted product adopts The dilute sulfuric acid with a mass percentage of 10% is leached out, and the leaching rate of Mn is 93.8%.

Embodiment 3

[0041]In advance, the hard manganese ore with a Mn grade of 36.4% is crushed to a mass percentage of -1.0mm, and the industrial sulfur (94%) is crushed to a mass percentage of -1.0mm, and then Mix the two evenly according to the mass ratio of 1:0.3; then put the mixture of the two into the reactor for heating and roasting, the roasting temperature is 600°C, and the roasting time is 55min; The leaching rate is 92.6%.

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Abstract

The invention discloses a manganese oxide mineral sulfur-based fire reduction method, which comprises: crushing a manganese oxide mineral and a sulfur-based reducer respectively till the mass percentage content of 1.0-millimeter particles is over 80 percent, and uniformly mixing the crushed manganese oxide mineral and the crushed sulfur-based reducer in a mass ratio of 1:(0.05-0.5); and placing in a closed environment and heating for roasting, wherein the obtained product of the roasting is a mixture of MnO and MnSO4. The method can realize the reduction of the manganese oxide mineral at a lower temperature and has the advantages of low energy consumption, high conversion efficiency, simple process and the like. The method overcomes the drawbacks of high temperature, low efficiency and high energy consumption of the conventional reduction roasting with the carbon-based reducer, and is suitable for processing manganese oxide minerals including pyrolusite, psilomelane, hausmannite, braunite, manganite, metamanganate and the like. In the invention, the process is simple, the operation is convenient, the roasting temperature is low, the energy consumption is low, the rate of the conversion from high-valence manganese to divalent manganese is high; the reduction roasting cost of the manganese oxide minerals can be reduced obviously; and the method is suitable for industrial application. Particularly, the method is suitable for preparing manganese sulfate and electrolytic manganese high-quality materials.

Description

technical field [0001] The invention relates to a reduction method of manganese oxide minerals, in particular to a sulfur-based fire reduction method of manganese oxide minerals, belonging to the fields of metallurgy and chemical industry. Background technique [0002] my country's manganese ore resources are mainly divided into two types: manganese oxide ore and manganese carbonate ore. Manganese carbonate ore is mainly used to produce electrolytic manganese, and the technology is mature and widely used at home and abroad. With the development of the manganese industry, the supply of high-quality manganese carbonate ore resources is becoming increasingly tight, which limits the development of the electrolytic manganese industry to a certain extent. High-grade and high-priced manganese oxide ore can be used as a high-quality raw material for the preparation of manganese sulfate and electrolytic manganese in industry due to its low impurity content. However, manganese oxide...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B3/08C22B47/00
Inventor 姜涛钟宏范晓慧张元波李光辉周友连郭宇峰杨永斌李骞陈许玲黄柱成许斌
Owner CENT SOUTH UNIV
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