Graphite furnace starting method applying induction furnace to smelt silicon

Abstract

The invention discloses a graphite furnace starting method applying an induction furnace to smelt silicon. The graphite furnace starting method comprises the following steps: putting silicon blocks or silicon powder in the induction furnace, and adding graphite in the induction furnace at the same time; starting the induction furnace, and rising the temperature to 1800-1900 DEG C; and smelting the silicon blocks or the silicon powder into silicon liquid, and taking out the graphite. According to the graphite furnace starting method, through a mode of adding the graphite in the silicon blocks, the induction furnace can also generate heat through own induction by utilizing weak conductivity of silicon water, and the purpose of smelting the silicon blocks is achieved; and compared with the maximum capacity 20KG of a crucible, through a mode of utilizing the induction furnace to smelt silicon, the single smelting quantity can be increased to 5 tons, so that the yield is greatly increased, and the production efficiency is greatly improved compared with crucible smelting in the prior art.

Description

technical field [0001] The invention relates to the field of reutilization and processing of silicon slag, in particular to a method for starting a graphite furnace using an induction furnace to melt silicon. Background technique [0002] Silicon slag generally refers to the remaining part after the ore is refined, and it also contains a certain amount of silicon. There are many kinds of silicon slag, industrial silicon slag, solar silicon slag, semiconductor silicon slag and so on. Silicon slag can be used to return to the furnace for recrystallization and purification. Now silicon materials are in short supply and expensive. Silico-manganese slag, also called silicomanganese smelting slag, is a kind of industrial waste slag discharged when smelting silicon-manganese alloys. Its structure is loose, and its appearance is often light green particles, which are composed of some porous amorphous particles with irregular shapes. The silicomanganese slag is brittle and fragile....

AI Technical Summary

Problems solved by technology

[0004] The current main equipment for silicon smelting is the crucible, and the technology of using the crucible for silicon smelting is relatively mature, but the biggest disadvantage of the crucible is that the capacity is too small, the amount of single smelting is small, and the bottleneck of difficult mass production has always restricted the development of silicon.