Method for preparing low-carbon metal manganese iron by using manganese-poor powdered ore

Abstract

The invention relates to a low-carbon ferromanganese production method using low-grade manganese mineral powder. The low-grade manganese mineral powder which has rich reserves is heated by a micro-wave oven, reduced by carbon, smelted at high temperature, purified by magnetic separation to directly prepare low-carbon ferromanganese. And the production method saves sintered agglomeration process with large energy consumption and serious pollution. The low-carbon ferromanganese with high purity is made through the steps that: the material is carefully chosen, crushed, fine- grinded, sieved, mixed, stirred, preheated by the micro-wave oven, pre-reduced through carbon monoxide, finally reduced, smelted at high temperature, cooled under the protection of nitrogen and purified by magnetic separation. The preparation method has the advantages of short technological process, less using equipment, being suitable for large- scale industrialization production, the yield rate can reach 98 percent, wherein manganese content is 75 percent and iron content is 20 percent, and the content of carbon is less than 0.5 percent; the content of harmful material sulfur is also less than 0.5 percent; the content of phosphor is less than 0.2 percent. The products have the advantages of low carbon, low phosphor and sulfur containing, no agglomeration, no pollution to environment. The method is the ideal ferromanganese direct production method using low-grade manganese mineral powder and fills up a scientific research blank in the field in China.

Description

technical field [0001] The invention relates to a method for preparing low-carbon metal ferromanganese from manganese-poor ore powder, belonging to the technical field of ferrous metal smelting and purification. Background technique [0002] Manganese element is the most important raw material for steelmaking. It is the most important alloying element to improve the hardness, strength and wear resistance of steel. It is often used in alloy structural steel, high manganese steel, stainless steel, tool steel, etc. [0003] Manganese and manganese ore reserves are relatively abundant, and South Africa and other countries have the largest reserves, and most of them are manganese-rich ore with manganese content ≥ 30%. Although there are many manganese ore resources in my country, most of them are poor manganese ore with manganese content 5-20%, and high phosphorus content, when refining and producing manganese, it is often necessary to add imported manganese-rich ore for mixed ref...

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Problems solved by technology

[0003] Manganese and manganese ore reserves are relatively abundant, and South Africa and other countries have the largest reserves, and most of them are manganese-rich ore with manganese content ≥ 30%. Although there are many manganese ore resources in my country, most of them are poor manganese ore with manganese content 5-20%, and high phosphorus content, when refining and producing manganese, it is often necessary to add imported manganese-rich ore for mixed refining, which greatly limits the extraction of manganese and increases the cost of extraction

[0004] At present, blast furnace method, electric furnace method or out-of-furnace method are mainly used to extract ferromanganese alloy. Since manganese ore is poor manganese ore, manganese ore can only be used after mineral processing to improve its grade. However, the powdery manganese ore produced by mineral processing is It cannot be used directly in the furnace, and artificial agglomeration, such as sintering, briquetting, and pelletizing, is required, which will increase the investment in the smelting process, increase energy consumption, increase pollution, lengthen the process, and take time and effort. Due to the different types of manganese ore powder, Mineral beneficiation is also required, and it is often necessary to add 2-3 mineral processing processes to make agglomerates. The agglomeration process also needs to add inorganic binders, which increases smelting energy consumption and impurities in ferromanganese alloy products, which affects the smelting process and product quality. have been affected and limited

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