Preparation method of industrial silicon smelting reducer

Abstract

The invention discloses a preparation method of an industrial silicon smelting reducer. The preparation method comprises the steps of uniformly mixing blind coal, a binder, various types of carbon powder and biomass to obtain a mixed material; adding the prepared mixed material in batches into a material bin of a molding machine, fully stirring in the material bin and slowly heating to the temperature of 80 DEG C to 300 DEG C, allowing the material to enter a pellet pressing system by the effect of the gravity of the material, and then performing a hot-press molding process to prepare pellets of which the sizes are from 150mm to 600 mm; rapidly demolding and drying the obtained pellets through cooling and scouring of water; adding the cooled and scoured pellets in batches into an industrial silicon ore-smelting furnace to replace charcoal to produce a high-quality industrial silicon product. An industrial silicon pellet reducer produced by the preparation method disclosed by the invention has the characteristics of high fixed carbon content, low ash content, good reaction activity, large porosity, proper particle size, high mechanical strength and the like, the yield can be increased, the product quality can be improved, the power consumption can be reduced, and the production cost can be lowered, so that the preparation method is suitable for smelting of industrial silicon of medium and large ore-smelting furnaces.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy smelting, and in particular relates to a preparation method of a reducing agent for industrial silicon smelting. Background technique [0002] The reducing agents used in the production of metal silicon in my country are mainly charcoal, wood blocks, petroleum coke and low-ash bituminous coal. Because charcoal has the largest porosity and many straight holes, it is suitable for gas to pass through, and its crystallization degree does not increase greatly at high temperatures, so it has high specific resistance and reaction ability under reducing conditions. So far, charcoal is the best reducing agent in the smelting process of metal silicon. For a long time, my country's industrial silicon production enterprises have always used charcoal as the main reducing agent. Bituminous coal, petroleum coke, etc. can only be mixed in a small amount, mainly due to the high degree of graphitiza...

AI Technical Summary

Problems solved by technology

Bituminous coal, petroleum coke, etc. can only be mixed in a small amount, mainly due to the high degree of graphitization of petroleum coke under high temperature conditions, resulting in low reduction activity, and the high content of vanadium and nickel in petroleum coke, which is easy to poison the catalyst used in organosilicon production. Reduce methylsilane conversion and selectivity

Although anthracite has high fixed carbon content and low ash content, it has problems such as low volatile matter, poor chemical activity, and easy expansion and thermal separation under high temperature conditions, so it cannot be directly used as a reducing agent to produce industrial silicon.

[0003] The production of charcoal requires the consumption of a large amount of forest resources. A large amount of charcoal consumption leads to less and less forest resources and seriously damages the ecological environment.

In the long run, my country's forest coverage area is less than 10% of the country's land. Forests need a certain growth cycle. A large number of deforestation does not meet the requirements of protecting the ecological environment, creating a low-carbon society, and developing a circular economy. The development of the silicon industry cannot At the cost of consuming a large amount of energy and forest resources that are not rich, due to the limitation of resources, the price of charcoal has risen sharply, which has seriously affected the economic benefits of silicon refining enterprises, and the development of the silicon industry has been restricted by reducing agents.