THE CHOICE OF THE REDUCING AGENT IN THE MANUFACTURE OF SILICON-MANGANESE

Abstract

The paper presents the results of two experimental campaigns of silicon-manganese  smelting brand MnS17 using coke nut and semicoke as a reducing agent, produced from brown coal of Kansk-Achinsk basin on the technology, which is based on the slicing coal gasification process.  The  experienced  campaign  of  silicon-manganese  smelting was performed using  a manganese ore  containing 42.7  and 38.44  % of manganese  in value  in  charge 1:3. The manganese  content  in  the melted alloys were 65.9 – 68.11 %, silicon – 17.47 – 18.3 %. It was established that using restorative mixture of 80 % of coke and 20 % of semi-coke  the  technical and  technological parameters of  the process deteriorated; with  the  introduction  into  restorative mixture of brown coal  in  the amount of 35 % at a flow rate of semi-coke of 27 % and coke of 38 % the electrical performance of the furnace stabilized, gas permeability  of  the  furnace  throat  recovered. The  best  performance was achieved with  the  introduction  into  restorative mixture of  semi-coke of 32,5 %,  a  further  increase of  its quantity  affects  the performance of the furnace.