Manganese oxide mineral sulfur-based fire reduction method

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...

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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 Prefecture Debang Chemical Co., Ltd. carried out roasting and reduction using semi-water gas as heat source and multi-chamber rotary kiln Test of manganese oxide ore; Chongqing University has carried out basic research on manganese oxide ore rotary kiln method in recent years, and achieved good reduction effect, but there are still problems such as high cost

[0018] In short, the existing carbon-based reduction methods using coke, anthracite, water gas, CO, etc. as reducing agents generally have high roasting temperature (greater than 850°C), large equipment investment, and high energy consumption (the consumption of coal-based reduction of anthracite is greater than 100kg / t), high cost (generally 380 yuan / t ~ 450 yuan / t) and other issues, resulting in the carbon-based fire reduction method is rarely used in industry