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Method for supplementing carbon at furnace bottom in metal silicon smelting process

A smelting process, metal silicon technology, applied in the direction of non-metallic elements, chemical instruments and methods, silicon compounds, etc., can solve the problems of rising furnace bottom, blocked furnace holes, low furnace bottom temperature, etc., and achieve the effect of improving furnace conditions

Active Publication Date: 2012-06-20
云南永昌硅业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of long-term lack of carbon in the reaction zone to produce excessive silicon dioxide, resulting in sticky slag that is difficult to discharge, low furnace bottom temperature, difficult to open the silicon outlet, unblocked furnace holes, and rising furnace bottom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Use waste carbon electrodes with a carbon content of 85-92wt% as raw materials, and crush them with a jaw crusher to make the particle size reach 80-100mm. When the current of one or two phase electrodes is lower than 70KA during production, When the current still cannot be increased after 8 hours of adjusting the electrode by pressing and discharging and three-phase balance, the method of adding waste electrodes is used for carbon replenishment. Push flat and lower the electrodes. The specific dosage is: when the electrode current is 50-60KA, manually add 100-200kg at the root of the electrode corresponding to each phase; when the electrode current is 40-50KA, manually add at the root of the electrode corresponding to each phase 200-300kg. Let the waste electrode pass through the low-temperature reaction zone into the silicon carbide formation reaction zone and the silicon melt formation area, and SiO 2 +3C=SiC+2O reaction and SiO+C=Si+CO reaction, make ...

Embodiment 2

[0034] Embodiment 2: use carbon content as 80-82wt% waste carbon brick as raw material, crush it with a jaw crusher, make the particle size reach 80-100mm, when the electrode current of one phase or two phases is lower than 70KA during production, pass If the current still cannot be increased after 8 hours of pressure-discharging electrodes and three-phase balance adjustment, carbon supplementation is carried out by adding waste carbon bricks. The main addition method is: add waste carbon brick raw materials to the large area between the corresponding two electrodes , and then push it to the root of the electrode with a ramming machine, and then push it away after normal feeding with the material pipe, and cover the added waste carbon bricks. The specific amount of addition is: when the electrode current is 50-60KA, in the corresponding large area Manually add 100-150kg; when the electrode current is 40-50KA, manually add 200-250kg on the corresponding large area. Let the wast...

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Abstract

The invention relates to a method for supplementing carbon at the furnace bottom in a metal silicon smelting process. Waste carbon electrodes of electric furnace smelting and / or waste carbon bricks of electric furnace smelting are / is used as carbon supplementing raw materials, and after crushing and during the electric furnace smelting production, the addition time and the addition quality are determined according to the electrode current intensity and the furnace condition change. When one phase or two phases of the electrode current are lower than the normal control range being 70 to 80KA, the electrode current is firstly improved through the electrode voltage drop, and when the electrode current still cannot be improved after 8 hours, the addition of the waste carbon electrodes and / or the waste carbon bricks is needed for carbon supplementation. The problems that the carbon is lacked in a reaction for a long time, excessive silicon dioxide is generated, furnace slag is sticky and cannot be easily discharged, the furnace bottom temperature is low, a silicon outlet is not easy to open, a furnace hole is not smooth, and the furnace bottom is raised are solved.

Description

1. Technical field [0001] The invention relates to a furnace bottom charcoal replenishing method in the metal silicon smelting process, belonging to the technical field of metal silicon electric furnace smelting. 2. Background technology [0002] In the electric furnace smelting process of metal silicon, batching is the first process. The amount of charcoal used in each batch of material directly affects the economic and technical indicators of each phase. The unit consumption of carbon is a key control index in the process of metal silicon electric furnace smelting. When the charcoal in the furnace is insufficient, the silica cannot be fully reduced, and the silica is excessive, a large amount of silicon monoxide is generated in the furnace, and a part of the excess silicon dioxide becomes liquid and slags together with the impurities in the raw materials, which changes the furnace condition. When there is excess carbon in the furnace, silicon carbide will be produced in th...

Claims

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Application Information

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IPC IPC(8): C01B33/025
Inventor 李宗有包崇军张安福卢国洪杨明礼王传昌张金清王正勇王加良张继忠
Owner 云南永昌硅业股份有限公司
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