Method for preparing high-silicon aluminum-silicon alloy by recycling crystalline silicon cutting waste through metallic aluminum

A technology for cutting waste and aluminum-silicon alloys, which is applied in the production of aluminum-silicon alloys, can solve problems such as slow reaction speed, large equipment corrosion, and high environmental load, and achieve the effects of lower melting point, short process, and efficient recycling

Inactive Publication Date: 2019-09-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the method of processing crystalline silicon cutting waste is mainly the wet process. The wet process has problems such as low production capacity, slow reaction speed, long process, high environmental load, and large equipment corrosion in production practice.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the method that utilizes metal aluminum to reclaim crystalline silicon cutting waste to produce high-silicon aluminum-silicon alloy is as follows:

[0022] (1) Mix aluminum particles and crystalline silicon cutting waste according to the mass ratio of 84:16, and then add Na according to 5% of the total material mass (the total mass of aluminum particles, crystalline silicon cutting waste and co-solvent) 3 AlF 6 As a flux, mix all materials thoroughly for later use;

[0023] (2) Put the mixed material in step (1) into a graphite crucible, place it in an induction furnace and heat it to 1000°C for high-temperature melting, and keep it warm for 4 hours;

[0024] (3) Cool the high-temperature melt in step (2) to room temperature at a cooling rate of 4°C / min;

[0025] (4) Use a wire cutting machine to remove the slag on the surface of the aluminum-silicon alloy sample obtained in step (3) to obtain a high-silicon aluminum-silicon alloy. According to XRF detec...

Embodiment 2

[0026] Embodiment 2: The method for producing high-silicon aluminum-silicon alloy by recycling crystalline silicon cutting waste from metal aluminum is as follows:

[0027] (1) Mix aluminum particles and crystalline silicon cutting waste according to the mass ratio of 74:26, then add CaO as a flux according to 15% of the total material mass, and fully mix all the materials for later use;

[0028] (2) Put the mixed material in step (1) into a graphite crucible, place it in an induction furnace and heat it to 1400°C for high-temperature melting, and keep it warm for 2 hours;

[0029] (3) Cool the high-temperature melt in step (2) to room temperature at a cooling rate of 2°C / min;

[0030] (4) Use a wire cutting machine to remove the slag on the surface of the aluminum-silicon alloy sample obtained in step (3) to obtain a high-silicon aluminum-silicon alloy. According to XRF detection, the Si content is 25.4%, the impurity Fe content is 0.42%, and Cu0. 022%, Mn0.0038%, Ni0.044%. ...

Embodiment 3

[0031] Embodiment 3: The method for producing high-silicon aluminum-silicon alloy by recycling crystalline silicon cutting waste from metallic aluminum is as follows:

[0032] (1) Mix aluminum particles and crystalline silicon cutting waste according to the mass ratio of 80:20, and then add flux (50% CaO, 50% Na 3 AlF 6 ), fully mix all the materials for later use;

[0033] (2) Put the mixed material in step (1) into a graphite crucible, place it in an induction furnace and heat it to 1100 °C for high-temperature melting, and keep it warm for 3 h;

[0034] (3) Cool the high-temperature melt in step (2) to room temperature at a cooling rate of 5°C / min;

[0035] (4) Use a wire cutting machine to remove the slag on the surface of the aluminum-silicon alloy sample obtained in step (3) to obtain a high-silicon aluminum-silicon alloy. According to XRF detection, the Si content is 21.3%, the impurity Fe content is 0.25%, and Cu0. 018%, Mn0.0027%, Ni0.034%.

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Abstract

The invention discloses a method for preparing a high-silicon aluminum-silicon alloy by recycling crystalline silicon cutting waste through metallic aluminum. Metallic aluminum particles, the crystalline silicon cutting waste and a fluxing agent are mixed according to a certain proportion and are contained in a graphite crucible and placed in an induction furnace for high-temperature melting; after heat preservation is carried out for a period of time, the product is cooled to room temperature at certain cooling speed; and after residues on the surface of the sample are separated out of the solidified alloy sample, the high-silicon aluminum-silicon alloy can be obtained. Due to the fact that the crystalline silicon cutting waste and the metallic aluminum particles are used as the raw materials, the content of Fe, Cu, Mn, Ni and other impurities in the prepared high-silicon aluminum-silicon alloy is far lower than the aluminum-silicon alloy impurity standard requirement. The method is low in cost, efficient and environment-friendly, the problem of comprehensive recovery of current silicon waste is solved, the high-silicon aluminum-silicon alloy product can also be directly produced through silicon waste, and a new way is provided for economical utilization of silicon containing waste.

Description

technical field [0001] The invention relates to a method for producing high-silicon aluminum-silicon alloy by recycling crystalline silicon cutting waste from metallic aluminum, and belongs to the technical field of comprehensive utilization of secondary resources of crystalline silicon materials and production of aluminum-silicon alloys. Background technique [0002] Crystalline silicon is the main raw material for the photovoltaic industry, and it is irreplaceable in the short term. At present, more than 80% of solar cell production needs to use crystalline silicon. Although the manufacturing cost of silicon wafers has been declining with the maturity of manufacturing technology, the cutting cost of silicon wafers has remained high, accounting for about 30% of the production cost. % or so, the polysilicon cutting process is mostly used to process solid silicon ingots, which is also a key link in the solar cell production process. The slicing technology of crystalline sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C21/02
CPCC22C1/026C22C1/06C22C21/02
Inventor 伍继君张雪峰马文会陈正杰魏奎先颜恒维雷云李绍元
Owner KUNMING UNIV OF SCI & TECH
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