A method for smelting 97 metal silicon

Abstract

The invention discloses a method for smelting 97 metallic silicon. A smelting device is provided; the smelting device comprises a smelting electric furnace, a raw material silica water-washing device,a raw material silica treatment device, a water-cooling coagulating tank and a water-cooling tank; the raw material silica treatment device is arranged at the top of the smelting electric furnace; the raw material silica water-washing device is arranged on one side of the raw material silica treatment device; an electric furnace inlet is formed in the top of the smelting electric furnace; the electric furnace inlet is communicated with the bottom of the raw material silica treatment device; the bottom of the smelting electric furnace is of a conical structure; two supporting frames are fixedly arranged at the bottom of the smelting electric furnace; a silicon liquid outlet is formed in the smelting electric furnace between the two supporting frames; the silicon liquid outlet is communicated with an input end of a discharging pump through a liquid guide pipe; the smelting device is reasonable and simple in structure; the energy consumption and the cost of 97 metal silicon smelting areeffectively reduced; furthermore, the production process flow is simple and practicable; and the product quality of the 97 metal silicon is improved by treating the granularity of the raw material silica, and the method is suitable for batched continuous production of the 97 metal silicon.

Description

Technical field [0001] The invention relates to the technical field of 97 metal silicon smelting, in particular to a method for smelting 97 metal silicon. Background technique: [0002] 97 Metallic silicon is also called iso-external silicon or industrial silicon. Its main use is as an additive for non-ferrous alloys. 97 metal silicon is a product smelted from silica and blue carbon in an electric furnace. The main component silicon content is about 98% (in recent years, 99.99% Si content is also included in 97 metal silicon), and the remaining impurities are Iron, aluminum, calcium, etc., but when the particle size is too large in the existing 97 metal silicon smelting process, unreacted silica will easily enter the liquid silicon, resulting in an increase in slag volume, difficulty in furnace discharge, reduced silicon recovery, and increased energy consumption. It even causes the bottom of the furnace to rise, affecting normal production, resulting in poor product quality of ...

AI Technical Summary

Problems solved by technology

97 metal silicon is a product smelted from silica and semi-coke in an electric furnace. The main component silicon content is about 98% (in recent years, 99.99% of Si content is also included in 97 metal silicon), and the remaining impurities are Iron, aluminum, calcium, etc., but when the particle size is too large in the existing 97 metal silicon smelting process, it is easy to cause unreacted silica to enter the liquid silicon, resulting in an increase in the amount of slag, difficulty in getting out of the furnace, a decrease in the recovery rate of silicon, and an increase in energy consumption. large, and even cause the bottom of the furnace to rise, affecting normal production, resulting in poor product quality of 97 metal silicon, and the heat loss of flue gas generated during 97 metal silicon smelting is relatively large, while the low-temperature raw material silica has a large heat absorption during smelting. The energy consumption and cost of 97 metal silicon smelting are relatively high, which is not suitable for the continuous batch production of 97 metal silicon

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