A silicon slag electroseparation method that effectively improves the recovery rate of silicon metal

A technology of silicon metal and recovery rate, which is applied to non-metallic elements, chemical instruments and methods, silicon compounds, etc., to achieve the effects of simple operation, low cost, and improved electro-separation efficiency and accuracy.

Active Publication Date: 2020-02-07
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

At present, the technology of recycling silicon slag by electro-separation has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for electroseparation of silicon slag that effectively improves the recovery rate of silicon metal, comprising the following steps:

[0035] 1) Silicon slag crushing: First, the silicon slag is fully crushed, and the particle size of the crushed silicon slag is controlled to be 60-100 mesh;

[0036] 2) Surface pretreatment of silicon slag: add a surface modifier to the crushed silicon slag after step (1), and stir well; the surface modifier is silicone oil, and the addition amount is 1kg / t 硅渣 ;

[0037] 3) Silicon slag heating: heat and dry the silicon slag treated in step (2) at 60°C for 10 minutes;

[0038] 4) Electric separation: Put the silicon slag obtained in step (3) into the electric separation equipment, and under the action of the electric field, sort according to the electrical difference between the elemental silicon in the silicon slag and the molten slag to obtain concentrate and silicon slag tailings. That is, the silicon slag tailings are sili...

Embodiment 2

[0041] A method for electroseparation of silicon slag that effectively improves the recovery rate of silicon metal, comprising the following steps:

[0042] 1) Silicon slag crushing: First, the silicon slag is fully crushed, and the particle size of the crushed silicon slag is controlled to be 60-100 mesh;

[0043] 2) Surface pretreatment of silicon slag: add a surface modifier to the crushed silicon slag after step (1), and stir well; the surface modifier is silicone oil, and the addition amount is 2kg / t 硅渣 ;

[0044]3) Silicon slag heating: heat and dry the silicon slag treated in step (2) at 120°C for 30 minutes;

[0045] 4) Electric separation: Put the silicon slag obtained in step (3) into the electric separation equipment, and under the action of the electric field, sort according to the electrical difference between the elemental silicon in the silicon slag and the molten slag. Separation and secondary electric separation, specifically, putting silicon slag into prima...

Embodiment 3

[0048] A method for electroseparation of silicon slag that effectively improves the recovery rate of silicon metal, comprising the following steps:

[0049] 1) Silicon slag crushing: First, the silicon slag is fully crushed, and the particle size of the crushed silicon slag is controlled to be 100-160 mesh;

[0050] 2) Surface pretreatment of silicon slag: add a surface modifier to the crushed silicon slag after step (1), and stir well; the surface modifier is silicone oil, and the addition amount is 1.2kg / t 硅渣 ;

[0051] 3) Silicon slag heating: heat and dry the silicon slag treated in step (2) at 80°C for 15 minutes;

[0052] 4) Electric separation: Put the silicon slag obtained in step (3) into the electric separation equipment, and under the action of the electric field, sort according to the electrical difference between the elemental silicon in the silicon slag and the molten slag to obtain concentrate and silicon slag tailings. That is, the silicon slag tailings are s...

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Abstract

The invention discloses a silicon slag electric separation method for effectively improving the recycling rate of silicon metal. The method comprises the following steps: 1) crushing silicon slag: firstly, sufficiently crushing the silicon slag; controlling the granularity of the crushed silicon slag to be 60 to 200 meshes; 2) pre-treating the surface of the silicon slag: adding a surfactant intothe silicon slag crushed through step (1), and sufficiently and uniformly stirring; 3) heating the silicon slag: heating and drying the silicon slag treated by step (2), wherein the temperature is 60to 120 DEG C; drying for 10 to 30min; 4) carrying out electric separation: adding the silicon slag obtained by step (3) into electric separation equipment; separating according to the difference of electrical properties of elemental silicon and molten slag in the silicon slag to obtain ore concentrate and silicon slag tailings. According to the silicon slag electric separation method disclosed bythe invention, the elemental silicon is extracted from industrial silicon waste slag by adopting an electric separation manner; an extraction method is simple and the cost is low; the recycling rate of the silicon metal in the silicon slag is improved to 90 percent or more from current about 65 percent, and maximum recycling of a silicon slag resource is effectively realized.

Description

technical field [0001] The invention belongs to the technical field of silicon slag treatment, and in particular relates to an electroseparation method for silicon slag that can effectively improve the recovery rate of silicon metal. Background technique [0002] Industrial silicon is a product smelted in an electric furnace with silica as the raw material and carbonaceous raw material as the reducing agent. The content of silicon as the main component is about 98%. In the process of industrial silicon smelting and production, Fe 2 o 3 , SiO 2 , MgO, Al 2 o 3 , CaO, etc. due to different reduction temperatures, Fe 2 o 3 , SiO 2 Mostly reduced, Al 2 o 3 , MgO and CaO can only be partially reduced. Unreduced Al 2 o 3 , MgO and CaO and SiO 2 together to form slag. Some of this slag accumulates together to form a distinct light-colored slag block, confined to the grain boundaries, and well-defined; other slag becomes dark particles that can only be seen under the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037B03C7/00
CPCB03C7/003C01B33/037
Inventor 文建华毕红兴王世宇赵兴凡任承伟张忠益杨贵明康万福梅志能赵茂庚张藜徐加雄
Owner 云南永昌硅业股份有限公司
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