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Industrial silicon smelting method

A smelting method and industrial silicon technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as poor reactivity of furnace charge, poor air permeability, furnace bottom rise, etc., to achieve improved reactivity, good air permeability, and reduced burnout effect

Inactive Publication Date: 2013-03-13
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, when full oil coke smelts industrial silicon, problems such as poor charge reactivity, poor air permeability, and serious furnace bottom rise, etc., thereby providing a kind of reactivity, good air permeability, and stable furnace bottom. industrial silicon smelting method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Silica: SiO 2 Silica with a content of 99.5wt% is crushed to a particle size between 8 and 150mm.

[0039] Petroleum coke: sea coke with an ash content less than 0.3wt%, crushed to a particle size of less than 10mm.

[0040] Binder: coal tar pitch

[0041] Bulking agent: straw

[0042] Heat to melt the coal tar pitch, spray 2 parts by weight of coal tar pitch on the surface of 72 parts by weight of silica, and then put it into the cylinder mixer together with 28 parts by weight of petroleum coke for mixing, and then spray 3 parts by weight of the mixed mixture part of coal tar pitch, and finally mix well.

[0043] Finally, 5 parts by weight of straw are added to the mixture for mixing, and then they are put into a submerged arc furnace together for smelting at 2700°C.

[0044] During the smelting process, there were no unfavorable phenomena such as furnace bottom rise and fire stabbing. The smelting condition is good: it can be observed that the electrode is deeply...

Embodiment 2

[0046] Silica: SiO 2 Silica with a content of 99.5wt% is crushed to a particle size between 8 and 150mm.

[0047] Petroleum coke: sea coke with an ash content less than 0.3wt%, crushed to a particle size of less than 10mm.

[0048] Binders: coal tar, pulp

[0049] Loosening agent: bagasse

[0050] Coal tar is first heated in the melting pool, then 71 parts by weight of silica is soaked in coal tar for 15 minutes. Known by weighing, the weight of coal tar on the surface of silica is 1 part by weight of silica, and the silica after soaking is mixed with 29 parts by weight. 5 parts of petroleum coke are put into the mixer and mixed, and the mixture is sprayed with 5 parts by mass of pulp, and then fully mixed evenly.

[0051]Finally, 8 parts by weight of bagasse are added to the mixed material for mixing, and then they are put into a submerged arc furnace together for smelting at 2800°C.

[0052] During the smelting process, there were no unfavorable phenomena such as furnace...

Embodiment 3

[0054] Silica: SiO 2 Silica with a content of 99.5wt% is crushed to a particle size between 8 and 150mm.

[0055] Petroleum coke: sea coke with an ash content less than 0.3wt%, crushed to a particle size of less than 10mm.

[0056] Binder: silane coupling agent solution

[0057] The silane coupling agent solution of 1 weight part is evenly coated on the surface of 70 weight parts of silica, the silane coupling agent solution of 3 parts by weight is evenly coated on the surface of 30 weight parts of petroleum coke, and the coated Petroleum coke and silica are further mixed evenly in a drum mixer.

[0058] The uniformly mixed material is put into the submerged arc furnace for smelting production, and the smelting is carried out at 2900°C.

[0059] During the smelting process, there were no unfavorable phenomena such as furnace bottom rise and fire stabbing. The smelting condition is good: it can be observed that the electrode is deeply and stably buried in the charge, the ch...

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Abstract

The invention discloses an industrial silicon smelting method, which belongs to the field of silicon purification and comprises the steps that: adhesion agents in the liquid form are mixed with silica and petroleum coke to form loose furnace feeding materials; and then, the furnace feeding materials are added into a submerged arc furnace for smelting, wherein the granularity distribution of the silica is within 8 to 150mm, the granularity of the petroleum coke is smaller than or equal to 12mm, and the adhesion agents are petroleum asphalt, coal pitch, coal tar, anthracene oil, silane coupling agents, paper pulp and the like. In the method, any raw materials such as charcoal, wood blocks and the like are not adopted, forest resources are protected, and the green environment protection is realized. The method has the advantages that the loose furnace feeding materials are prepared through the adhesion agents, the petroleum coke is adhered on the silica, the reaction area is increased, the reactivity of furnace materials is improved, the burning loss and the blowing loss of the petroleum coke are reduced, the powdery petroleum coke is concentrated on the surface of the silica, and the powdery petroleum coke in the material layer is relatively reduced, so good ventilation of the material layer is ensured.

Description

technical field [0001] The invention belongs to the technical field of silicon purification, and in particular relates to a method for smelting industrial silicon. Background technique [0002] Industrial silicon is the most basic functional material in information industry, new energy industry and new material industry. It is known as "magic metal" and "industrial monosodium glutamate". The industrial products derived from industrial silicon are of various varieties and involve a wide range of fields. It is mainly used in the following four fields: one is used as a binder for smelting aluminum and steel; Used in the manufacture of semiconductor silicon, silicon ceramics, silicon carbide, silicon nitride and other new materials. [0003] Industrial silicon is generally prepared by carbothermal reduction smelting. That is, the carbon reducing agent and silica are crushed to a certain particle size, mixed and put into ore heat for smelting. In the early days, charcoal was...

Claims

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Application Information

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