A kind of fluidized low-temperature reduction method of powdery manganese oxide ore

Abstract

The invention relates to a fluidized low-temperature reduction device and a fluidized low-temperature reduction method for powdery manganese oxide ores. The device comprises a feeding unit, a preheating unit, a reduction roasting unit and a cooling unit which are connected from top down, wherein the reduction roasting unit is connected with a combustion chamber; and the combustion chamber is connected below the preheating unit. In the reduction method, tail gas formed in the reduction process enters the combustion chamber combusts with supplementary gas and air to form flue gas; and the flue gas is subjected to countercurrent heat exchange with the manganese oxide ores. The fluidized low-temperature reduction device and the reduction method have the advantages that: the gas can be used as a reducer and also can be used as fuel; and the utilization rate of the gas is 100 percent. In the reduction device, the reduction temperature of the manganese oxide ores is low, so a manganese-containing phase which is insoluble to sulfuric acid is avoided, and heat carried by the manganese oxide ores is reduced by over 30 percent. The manganese oxide ores in a fluidized reduction roasting furnace are in the bubbling fluidized state, the heat transfer efficiency, the mass transfer efficiency and the reaction efficiency are high, the distribution of retention time is uniform, and the reduction rate of the manganese oxide is more than 98 percent.

Description

technical field

[0001] The invention belongs to the fields of chemical industry and metallurgy, and in particular relates to a fluidized low-temperature reduction device and reduction method for powdered manganese oxide ore. Background technique

[0002] Electrolytic manganese is an important raw material for the production of stainless steel, high-strength low-alloy steel, aluminum-manganese alloy, copper-manganese alloy, etc. It is also the main raw material for the production of welding electrodes, ferrite, permanent magnetic alloys, and manganese salts for many pharmaceutical and chemical industries. Manganese ore, the main raw material for the production of electrolytic manganese metal, is mainly divided into two categories: manganese oxide ore and manganese carbonate ore. Manganese carbonate ore can be directly leached by sulfuric acid solution to prepare manganese sulfate solution, and then an electrolyte solution is prepared through a series of processes such as neut...

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