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.