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Production method for smelting ferrosilicon by utilizing crystalline silicon cutting waste powder

A production method and technology of crystalline silicon, which is applied in the production field of smelting ferrosilicon by using crystalline silicon cutting waste powder, can solve environmental pollution and other problems, achieve the effects of solving environmental pollution problems, reducing coke consumption, and significant social and environmental protection effects

Inactive Publication Date: 2016-05-11
四川川投峨眉铁合金(集团)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention aims at proposing a production method for smelting ferrosilicon by using crystalline silicon cutting waste powder on the basis of existing metallurgical technology, which can effectively solve the environmental pollution problem caused by the stacking of a large amount of tailing powder in the crystalline silicon slice industry, For the smelting of ferrosilicon products, a treasure house of silicon resource raw materials with high energy storage and strong reducibility and a new process for producing ferrosilicon with high efficiency and low consumption have been developed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A production method for smelting ferrosilicon by using crystalline silicon cutting waste powder, which is carried out in the following steps:

[0034] ①Measuring ingredients: weigh the materials according to the following proportions by weight,

[0035] Silica raw material 1000kg,

[0036] Crystal silicon cutting waste powder 700kg,

[0037] Coke 400kg,

[0038] Steel shavings 200kg,

[0039] The above-mentioned "crystalline silicon cutting waste powder" refers to the silicon powder waste obtained by recycling the cutting mortar waste generated by polycrystalline silicon and monocrystalline silicon slicing operations;

[0040] ② Furnace smelting: The materials weighed according to the weight ratio in the step of "measurement and batching" are input into the ferroalloy smelting submerged arc furnace, and the smelting operation is carried out according to the process conditions required for smelting ferrosilicon;

[0041] ③Molten iron pouring: After removing the slag ...

Embodiment 2

[0044] The invention discloses a production method for smelting ferrosilicon by using crystalline silicon cutting waste powder, which is carried out sequentially according to the following steps:

[0045] ①Measuring ingredients: weigh the materials according to the following proportions by weight,

[0046] Silica raw material 1000kg,

[0047] Crystal silicon cutting waste powder 1000kg,

[0048] Coke 350kg,

[0049] Steel shavings 350kg,

[0050]The above-mentioned "crystalline silicon cutting waste powder" refers to the silicon powder waste obtained by recycling the cutting mortar waste generated by polycrystalline silicon and single crystal silicon slicing operations.

[0051] Then follow the steps of "2. furnace smelting, 3. molten iron pouring, 4. finishing and removing slag" in order to obtain qualified ferrosilicon products.

Embodiment 3

[0053] The invention discloses a production method for smelting ferrosilicon by using crystalline silicon cutting waste powder, which is carried out sequentially according to the following steps:

[0054] ①Measuring ingredients: weigh the materials according to the following proportions by weight,

[0055] Silica raw material 1000kg,

[0056] Crystal silicon cutting waste powder 1200kg,

[0057] Coke 300kg,

[0058] Steel shavings 280kg,

[0059] The above-mentioned "crystalline silicon cutting waste powder" refers to the silicon powder waste obtained by recycling the cutting mortar waste generated by polycrystalline silicon and single crystal silicon slicing operations.

[0060] Then follow the steps of "2. furnace smelting, 3. molten iron pouring, 4. finishing and removing slag" in order to obtain qualified ferrosilicon products.

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Abstract

The invention discloses a production method for smelting ferrosilicon by utilizing crystalline silicon cutting waste powder. The production method is characterized in that the crystalline silicon cutting waste powder can be directly molten into a ferrosilicon component under a high-temperature melting state by utilizing the matter characteristic that the high-purity simple substance silicon in the crystalline silicon cutting waste powder is a silicon component in ferrosilicon; unit power consumption and coke consumption of smelting the ferrosilicon can be greatly reduced by reducing silicon dioxide in silica raw materials through strong reduction characteristic of silicon carbide and releasing a great deal of reaction heat; equipment investment is not required to be increased, so that in case of current equipment, crystalline silicon cutting waste powder (namely powder tailings) can be recycled on a large scale for being added into furnace burden for smelting production of a ferrosilicon product, and therefore, a silicon resource raw material treasury with high energy storage property and strong reducing property is developed for producing and smelting the ferrosilicon product in the metallurgical industry, the environmental pollution problem caused by stocking and stacking the cutting waste powder for a long time in the crystalline silicon slicing industry can be effectively solved, and remarkable social environment-friendly effect and great economic benefits are achieved.

Description

technical field [0001] The invention relates to a production method for smelting ferrosilicon by using crystalline silicon cutting waste powder, and belongs to the production technical field of recycling waste crystalline silicon slicing to smelt ferrosilicon products. Background technique [0002] With the rapid development of the global solar photovoltaic industry, the market demand for crystalline silicon products (including polycrystalline silicon and monocrystalline silicon) is increasing day by day, and the processing scale of the crystalline silicon slicing industry is also increasing. So far, in my country's current crystalline silicon slicing industry, most of them adopt the relatively mature "wire cutting" slicing process. The mortar mixed with silicon carbide powder is sent to the cutting area to cut the crystalline silicon ingot to complete the slicing operation. During the slicing process, a large amount of silicon powder (accounting for about 20%-40% of the wei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B4/06C22C33/04C22C35/00
CPCC22B4/06C22C33/04C22C35/005
Inventor 唐华应吴孝郑再春郑惠丽
Owner 四川川投峨眉铁合金(集团)有限责任公司
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