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Industrial silicon smelting abnormity treatment method

A technology for abnormal handling and industrial silicon, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as economic loss, quality decline, increase raw material and power consumption, etc., to solve abnormal problems and reduce heat loss. , the effect of reducing the yield

Inactive Publication Date: 2013-04-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flame piercing hole will release a large amount of heat and reduced silicon and other oxides, which will not only cause a large loss of heat energy and smelting products, increase the consumption of raw materials and electric energy, but also increase the temperature of the upper part of the hearth. Affects electrode assemblies and other equipment and components close to the furnace surface
[0005] If the above abnormal problems are not dealt with in time or improperly, a large amount of smelting products and heat will be lost
It will eventually lead to difficult operation, high power consumption, quality decline, failure of normal production, and forced shutdown of the furnace, resulting in great economic losses

Method used

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  • Industrial silicon smelting abnormity treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Silica: the content of silicon dioxide is 99wt%, crushed to a particle size of less than 8mm.

[0040] Silicon carbide: the purity is 98wt%, crushed to a particle size of less than 6mm.

[0041] Binder: petroleum asphalt, epoxy resin

[0042] Proportioning silica and silicon carbide with a mass ratio of 1.1:1, adding 4wt% petroleum pitch and 4wt% epoxy resin of the total amount of silica and silicon carbide at the same time, mixing evenly, and then pressing on a press to form a particle size of 50mm sphere. Make furnace charge A1.

[0043] When there are smelting abnormalities such as furnace bottom rising and stinging during the smelting process, the prepared furnace charge A1 is added to the submerged arc furnace for smelting.

[0044] With the smelting of the furnace charge, it can be seen that the current gradually tends to be stable, the electrodes can be inserted slowly, the air permeability of the charge surface is significantly improved, and the gas is evenly...

Embodiment 2

[0046] Silica: the content of silicon dioxide is 99wt%, crushed to a particle size of less than 10mm.

[0047] Silicon carbide: the purity is 98wt%, crushed to a particle size of less than 6mm.

[0048] Binder: coal tar pitch (10wt% of the total amount of silica and silicon carbide)

[0049] Heat the molten coal tar pitch in a kneading pot, add silica and silicon carbide with a mass ratio of 2.2:1 into the kneading pot, and mix them well and evenly. It is then sent into a press and pressed into a cylinder with a diameter of 40mm and a height of 60mm. Make furnace charge A2.

[0050] When there are smelting abnormalities such as furnace bottom rise and stinging during the smelting process, the prepared furnace charge A2 is added to the submerged arc furnace for smelting.

[0051]With the smelting of the furnace charge, it can be seen that the current gradually tends to be stable, the electrode can be inserted slowly, the air permeability of the charge surface is significantl...

Embodiment 3

[0053] Silica: the content of silica is 99wt%, crushed to a particle size of less than 6mm.

[0054] Silicon carbide: the purity is 98wt%, crushed to a particle size of less than 3mm.

[0055] Mix silica and silicon carbide at a mass ratio of 0.75:1, and mix them evenly. Then send it into the press machine to press the block of growth * width * height = 50mm * 40mm * 30mm. Make furnace charge A3.

[0056] When there are smelting abnormalities such as furnace bottom rise and stinging during the smelting process, the prepared furnace charge A3 is added to the submerged arc furnace for smelting.

[0057] With the smelting of the furnace charge, it can be seen that the current gradually tends to be stable, the electrode can be inserted slowly, the air permeability of the charge surface is significantly improved, and the gas is evenly emitted from the charge surface. When the furnace condition is about to turn to normal and the electrode is lowered close to the bottom of the fur...

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Abstract

The invention belongs to the field of industrial silicon smelting and particularly discloses an industrial silicon smelting abnormity treatment method, which comprises the following steps of: adding furnace regulation materials into a submerged arc furnace in abnormal smelting; and carrying out smelting at a high temperature being 2350 to 3000 DEG C until the furnace condition is normal, wherein the furnace regulation materials comprise block materials or ball materials formed by mixing and pressing silica and silicon carbide, the mass ratio of the silica to the silicon carbide is 0.7 / 1 to 2.3 / 1, the granularity of the silica is smaller than or equal to 10mm, and the granularity of the silicon carbide is smaller than or equal to 6mm. The industrial silicon smelting abnormity treatment method provided by the invention has the advantages that the furnace halt is not needed, the method is simple and is easy to implement, the problem of abnormity in the smelting process can be effectivelysolved, in addition, the utilization rate of reducing agents is high, the furnace discharge rate of silicon is not reduced, the heat loss is little, and the like.

Description

technical field [0001] The invention belongs to the technical field of industrial silicon smelting, and in particular relates to a method for treating abnormalities in industrial silicon smelting. Background technique [0002] At present, industrial silicon smelting generally adopts the carbothermal reduction method; that is, in the submerged arc furnace, the electric energy is converted into heat energy through the electrodes, and the silica in the furnace is reacted with the reducing agent (charcoal, petroleum coke, bituminous coal and other carbon materials) to prepare industrial silicon. silicon. [0003] Such as figure 1 As shown, A is the electrode, and the submerged arc furnace is divided into 5 zones from top to bottom: 1 is the preheating zone, 2 is the hot zone, 3 is the melting zone, 4 is the reaction zone, and 5 is the silicon water zone. [0004] In the process of producing industrial silicon, due to the selection of reducing agent, different raw material rati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/025
Inventor 沈益顺吴绍钿司雷
Owner BYD CO LTD