Method of producing manganese monoxide by utilizing waste manganese dioxide

Abstract

The invention relates to the technical field of mineral resource utilization and specifically relates to a method of producing manganese monoxide by utilizing waste manganese dioxide. The method comprises the following steps: by taking low-grade manganese dioxide powder and common anthracite powder as raw materials, pre-heating by utilizing waste heat exchange to remove moisture, initially and quickly heating and roasting by utilizing medium-frequency magnetic wave induction, heating, roasting and reducing in a sectional manner by virtue of a thermal resistance wire, preserving heat and continuing to reduce, cooling by utilizing closed waste heat exchange, cooling by virtue of water quenching, discharging and enabling the raw materials to enter a storage bin to prepare efficient, energy-saving and cheap manganese monoxide roasted powder. According to the method disclosed by the invention, low-grade and low-cost manganese dioxide is adopted as production raw materials, so that recycling of the waste manganese dioxide can be realized.

Description

technical field [0001] The invention relates to the technical field of mineral resources utilization, specifically a method for producing manganese monoxide by using waste manganese dioxide, which realizes the recovery of waste manganese dioxide by using low-grade and low-cost manganese dioxide as production raw materials Reuse. Background technique [0002] Manganese monoxide roasting powder is the main raw material for the production of manganese sulfate and electrolytic manganese, especially low-grade, low-cost manganese monoxide roasting powder alone or in combination with low-grade manganese carbonate to produce electrolytic manganese has wider uses and lower cost. The production of manganese monoxide is mainly obtained through the reduction of manganese dioxide. The method used in the past is to use high-grade manganese carbonate or high-grade manganese dioxide to roast to produce electrolytic manganese. This production method has low resource utilization rate and high...

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Problems solved by technology

[0005] (2) Vertical kiln (shaft kiln) gas reduction method: use high-quality lump coal with more than 6000 kcal to burn gas and then enter the furnace body for roasting. It is suitable for burning sand ore, not suitable for burning powder ore. The amount of coal is 350-400kg, but there are problems such as low output, high pollution, high cost, short service life of the kiln body, high maintenance rate, and poor safety, and has not been confirmed by the environmental protection department.

[0006] (3) Coal-burning rotary kiln reduction method: This method has the characteristics of large investment cost, high output, low coal consumption, and part of the waste heat can be recovered; but it is difficult to control the roasting temperature, the reduction rate is unstable, and coal burning is not optimistic. , Coal quality is limited, there are pollution problems, and it has not been approved by the environmental protection department

[0007] (4) Electrothermal rotary kiln reduction method: This method adopts a fully enclosed production process of heating, reduction and cooling, which has the advantages of high output, high reduction rate, stability and small dust, but at the same time has high power consumption, waste heat cannot be recovered, and water consumption The problems of large quantity, large investment cost and difficult maintenance of furnace body

[0008] Over the years, experts in the electrolytic manganese industry have been making unremitting efforts to reduce the cost of manganese dioxide reduction, but the effect is very limited