Method of processing raw materials for production of ferrosilicon silicocalcium and high purity silicon

Abstract

The invention relate to smelt technology field, especially relate to a method of processing raw material of ferrosilicium, silicon calcium and monocrystalline silicon, the feature as follow: disintegrating silica dioxide and carbon raw material to powder that the particle diameter less than 1mm, according to weight ratio SiO2:C=1:(0.4-0.6) to modeling; The described modeling method is that silica dioxide and carbon raw material powder are mixed, and then take into mixer to mix, add the water that the weight is 3-15% of raw material weight, after intimate mixing, take into cold-roll-forming machine to press forming, the forming ball material sun-cure and natural ventilating dry after denaturation treatment; the method substantial increase reaction contact area, improve the chemical reaction speed in the stove, decrease the electrical energy consumption apparently and improve production.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for processing raw materials for producing ferrosilicon, silicon-calcium and high-purity silicon in an electric smelting furnace. Background technique [0002] At present, the smelting of ferrosilicon and calcium silicon is to crush the carbon raw material to a particle size of 10-30mm. Silica: processed into a block of 40-120mm in a large-capacity electric furnace, and processed into a block of 25-80mm in a small-capacity electric furnace below 3000kva , according to a certain proportion of silicon dioxide and carbon into the furnace for production, using this raw material for production, because coal, silica and other raw materials have a certain particle size, especially coal, which will never melt in the smelting furnace, when silica and lime melt Finally, the chemical reaction can only be carried out on the surface of the coal and gradually enters the pores of the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the smelting of ferrosilicon and calcium silicon is to crush the carbon raw material to a particle size of 10-30mm. Silica: processed into a block of 40-120mm in a large-capacity electric furnace, and processed into a block of 25-80mm in a small-capacity electric furnace below 3000kva , according to a certain proportion of silicon dioxide and carbon into the furnace for production, using this raw material for production, because coal, silica and other raw materials have a certain particle size, especially coal, which will never melt in the smelting furnace, when silica and lime melt Finally, the chemical reaction can only be carried out on the surface of the coal and gradually enters the pores of the coal. In this way, the contact area of ​​the reactant is very limited, so the chemical reaction speed is relatively slow, which seriously affects the output and is accompanied by the increase of energy consumption. The current production of raw materials generally has a daily output of 20-25 tons, and the power consumption per ton is 8400-9000kvA, and the power consumption per ton of silicon-calcium is 13000kvA; it can be seen from this that the raw materials produced by the current processing method have high power consumption. Serious waste of energy and low output