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High temperature composite semi-coke reducing agent of metal silicon, and preparation method and application method thereof

A reducing agent and metal silicon technology, applied in the field of metal silicon manufacturing, can solve the problems of low fixed carbon content, unsatisfactory indicators, rising furnace bottom, etc., achieve high fixed carbon content, meet production needs, and reduce raw material costs.

Inactive Publication Date: 2017-03-29
曲靖市马龙区明龙焦化实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The production of charcoal needs to cut down a large number of trees, destroying the ecological environment, which is not conducive to sustainable development, and the production cost of charcoal is relatively high, which is not conducive to ensuring the economic benefits of silicon refining enterprises
The properties of bituminous coal are good, but the ash content is high, the fixed carbon content is low, the reducing agent produced is also high in ash, the mechanical strength is poor, and the burning loss is large during the smelting process
The fixed carbon content of petroleum coke is high, but petroleum coke will lead to strong graphitization, which will make the bottom of the furnace rise and affect production
Some indicators of the reducing agent produced by using the above materials can better meet the requirements for the reducing agent, but some indicators are not satisfactory, which is not conducive to the production of metal silicon

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0036] The preparation method of the high-temperature composite blue-carbon reducing agent of above-mentioned metallic silicon comprises the following steps:

[0037] A. Weigh coal tar pitch and long-flame coal, gas coal and fat coal after coal washing processing in proportion; coal washing processing includes rough washing and fine washing to remove impurities in raw coal and improve the quality of coal.

[0038] B. Dry the long-flame coal and mix it with coal tar pitch evenly, and pulverize the mixture. After crushing, the mass fraction of the part with a particle size less than 1mm is greater than 95%; drying is carried out in a drum drying system, and the long-flame coal and coal tar pitch Mixing and crushing are carried out in a ball mill.

[0039] C, mixing the particles obtained in step B with gas coal and fat coal, and then pulverizing, after pulverizing, the mass fraction of the part whose particle size is less than 2mm is greater than 95%;

[0040] D. Vibrating siev...

Embodiment 1

[0050] The weight percentages of long-flame coal, gas coal, fat coal and coal tar pitch are 30%, 32%, 35% and 3% respectively, and the coal tar pitch and long-flame coal, gas coal and coal tar pitch after coal washing are weighed in proportion Fatty coal: dry the long-flame coal and mix it with coal tar pitch evenly, and crush the mixture. The mass fraction of the part with a particle size less than 2mm is greater than 95%; the iron is removed by vibrating sieving, and then the mixed particles are tamped into a cake with a weight of 25 tons of coal in a tamping furnace; Dry distillation at high temperature, the dry distillation time is 30h to 40h; after water quenching and cooling, the coke is crushed to a particle size of 10mm-22mm; iron is removed to obtain high-temperature composite blue coke.

[0051] The composition and weight percentage of the high-temperature composite blue carbon prepared in this example are: 0.1% of internal water, 4% of ash, 3% of volatile matter, 0....

Embodiment 2

[0053] The weight percentages of long-flame coal, gas coal, fat coal and coal tar pitch are 35%, 40%, 20% and 5% respectively, and the coal tar pitch and long-flame coal, gas coal and coal tar pitch after coal washing and processing are weighed in proportion. Fatty coal: dry the long-flame coal and mix it with coal tar pitch evenly, and crush the mixture. The mass fraction of the part with a particle size less than 2mm is greater than 95%; the iron is removed by vibrating sieving, and then the mixed particles are tamped into a cake with a weight of 25 tons of coal in a tamping furnace; Dry distillation at high temperature, the dry distillation time is 30h to 40h; after water quenching and cooling, the coke is crushed to a particle size of 10mm-22mm; iron is removed to obtain high-temperature composite blue coke.

[0054] The composition and weight percent of the high-temperature composite blue carbon prepared in this example are: 0.1% internal water, 3% ash, 2% volatile matter...

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Abstract

The invention discloses a high temperature composite semi-coke reducing agent of metal silicon. The high temperature composite semi-coke reducing agent comprises, by weight, 30 to 50% of jet coal, 20 to 40% of gas coal, 15 to 35% of fat coal, and 3 to 7% of coal tar pitch. A preparation method comprises steps of mixing, crushing, high temperature dry distillation, and crushing. In an application method, silica and the high temperature composite semi-coke reducing agent are uniformly mixed at a weight ratio of (2.4-2.7):1.1, and are delivered into a high-temperature electric furnace. The high temperature composite semi-coke reducing agent possesses following advantages: the raw materials are cheap; reducing performance is excellent; the high temperature composite semi-coke reducing agent is capable of satisfying requirements of metal silicon production preferably, increasing the yield of metal silicon and silicon yield, and reducing production cost.

Description

technical field [0001] The invention belongs to the technical field of metal silicon production, in particular to a high-temperature composite blue-carbon reducing agent for metal silicon and its preparation method and use method. Background technique [0002] With the rapid development of the semiconductor industry and the photovoltaic industry, the demand for metal silicon is increasing day by day. Silicon metal is a high-energy-consuming industry, and its production mainly uses silica as raw material and carbonaceous material as reducing agent, and is produced in an electric furnace. Metal silicon needs a large amount of reducing agent in the reduction process, and has strict requirements on the reducing agent: high content of fixed carbon, low ash content, good reactivity, high specific resistance, etc. For the specific principles, please refer to the paper "A Brief Discussion Several carbonaceous reducing agents for industrial silicon" ("Value Engineering", Issue 26, 2...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B33/025
CPCC01B33/025C01P2006/16C01P2006/40C01P2006/90
Inventor 李永安
Owner 曲靖市马龙区明龙焦化实业有限公司
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