Method for manufacturing ferrosilicon by silica fume, coke powder and oxidized sheet iron pressed compact

Abstract

The invention discloses a method for manufacturing ferrosilicon by silica fume, coke powder and oxidized sheet iron pressed compact. The manufactured ferrosilicon comprises the following raw materials according to weight percentages: 55%-60% of waste silica fume with 97%-99% of SiO2, 25%-32% of waste coke powder with 84%-90% of carbon, 7%-10% of oxidized sheet iron, 2%-5% of swell soil, 0.8-1.5% of industrial syrup, 1%-2% of water glass, and 1%-2% of lime. The sum of the above percentages of the raw materials is 100%, wherein, granularity of silica fume is 3mm-30mm, granularity of coke powder is 3mm-10mm, and granularity of oxidized sheet iron is 5mm-15mm. The method of the invention uses waste silica fume to replace silica, waste coke powder to replace semi coke or metallurgical coke and oxidized sheet iron to replace steel cuttings; the method uses pressed compact to manufacture silicoferrite, thereby not only fastening smelting speed of ferrosilicon to shorten smelting time of the ferrosilicon, but also saving electrical energy to save approximately 15% of smelting cost. The method also has fine furnace condition and operation condition of smelting, so as to improve working environment of the workers while reducing working intensity of the workers.

Description

technical field [0001] The invention relates to the field of ferroalloy production, in particular to a method for producing ferrosilicon alloys by using waste silica powder, coke powder and oxidized iron sheet briquettes. Background technique [0002] The general raw materials for ferrosilicon production are: silica, metallurgical coke or semi-coke and steel scrap, and there are certain requirements for the particle size of the raw materials. The particle size of silica is generally 30-100 mm; the particle size of metallurgical coke or semi-coke is generally 10-100 mm. 18mm. In normal production, when silica is crushed, about 10% to 15% of silica powder with a particle size of less than 30mm does not meet the smelting requirements. At present, there is no good way to use silica powder, and it can only be discarded and piled up; while metallurgical enterprises in the coking process It will produce coke powder with particle size less than 8mm, accounting for about 10% of the ...

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Problems solved by technology

These discarded resources cannot be reused, which not only causes a lot of waste of resources, but also increases production costs and reduces economic benefits. More importantly, waste silica powder and coke powder are piled up in the open air to occupy cultivated land, exposed to wind and sun, flying around, causing environmental damage. Severe dust pollution directly affects the working and living environment of the production plant and the surrounding residents, endangering human health

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