Method for utilizing crystalline silicon cutting waste

A technology for cutting waste and crystalline silicon, which is applied in the field of utilization and treatment of crystalline silicon cutting waste, can solve the problems of complex process and low consumption, and achieve the effects of low melting point, promotion of reaction and good fluidity

Pending Publication Date: 2021-08-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low consumption and complex process in the existing crystalline silicon cutting waste treatment technology, the purpose of the present invention is to provide a method for utilizing crystalline silicon cutting waste, which uses crystalline silicon cutting waste for ferromolybdenum smelting, and replaces silicon As a reducing agent, iron can effectively reduce the production cost in ferromolybdenum smelting, and realize efficient and large-scale utilization of crystalline silicon cutting waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for utilizing crystalline silicon cutting waste in this embodiment includes the following steps:

[0034] Weigh 100 parts by mass of molybdenum calcine, 30 parts of crystalline silicon cutting waste, 8 parts of aluminum particles, 30 parts of iron and phosphorus, 30 parts of steel scrap, 12 parts of quicklime, 4 parts of fluorite, and 3 parts of saltpeter, Carry out mixing and pelletizing in a pelletizer for 10 minutes, and spray 6wt% of water during the process; put the uniformly mixed pellet material into the furnace, the ratio of the height of the charge D to the full height of the furnace is D / H=0.37, and at the top of the charge 5 wt % rice husks are covered; after the reaction is completed, let stand to allow ferromolybdenum to settle, and then open the slag discharge port to discharge slag; finally pull out the furnace drum, and the alloy ingot can be cooled in the sand to obtain the ferromolybdenum alloy. The chemical element analysis shows that the mol...

Embodiment 2

[0036]Weigh 150 parts of molybdenum calcining sand, 40 parts of crystalline silicon cutting waste, 15 parts of aluminum granules, 38 parts of iron and phosphorus, 42 parts of steel scraps, 15 parts of quicklime, 5 parts of fluorite, 5 parts of saltpeter by weight respectively, Carry out mixing and pelletizing in a pelletizer for 13 minutes, and spray 10wt% of water during the process; put the evenly mixed pelletized material into the furnace, the ratio of the height of the charge D to the full height of the furnace is D / H=0.4, and the top of the charge is placed at the top of the furnace. 8 wt% rice husks are covered; after the reaction is finished, let stand to settle the ferromolybdenum, and then open the slag discharge port to discharge the slag; finally pull out the furnace drum, and the alloy ingot can be cooled in the sand to obtain the ferromolybdenum alloy. The chemical element analysis shows that the molybdenum content in the prepared ferromolybdenum is 60.3 wt %, the ...

Embodiment 3

[0038] Weigh 130 parts of molybdenum calcining sand, 37 parts of crystalline silicon cutting waste, 10 parts of aluminum granules, 34 parts of iron and phosphorus, 35 parts of steel scraps, 12 parts of quicklime, 4 parts of fluorite, 5 parts of saltpeter, respectively, in parts by mass, Carry out mixing and pelletizing in a pelletizer for 15 minutes, and spray 7wt% of water during the process; put the uniformly mixed pellet material into the furnace, the ratio of the height of the charge D to the full height of the furnace is D / H=0.39, and the top of the charge is placed at the top of the furnace. 5.4wt% rice husks are covered; after the reaction is finished, let stand to allow ferromolybdenum to settle, and then open the slag discharge port to discharge slag; finally pull out the furnace tube, and the alloy ingot can be cooled in the sand to obtain the ferromolybdenum alloy. The chemical element analysis shows that the molybdenum content in the prepared ferromolybdenum is 58.6...

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Abstract

The invention discloses a method for utilizing crystalline silicon cutting waste. The method comprises the following steps of smelting a ferromolybdenum alloy by using a pellet material containing the silicon cutting waste to obtain the ferromolybdenum alloy. The pellet material is prepared from, by mass, 100-150 parts of molybdenum calcine, 30-40 parts of the silicon cutting waste, 8-15 parts of aluminum particles, 30-38 parts of iron phosphorus, 30-42 parts of steel cuttings, 12-15 parts of quick lime, 2-5 parts of fluorite and 7-10 parts of saltpeter. The silicon cutting waste adopts monocrystalline silicon and / or polycrystalline silicon cutting waste, and the silicon cutting waste contains metal Si, SiC and polyethylene glycol. According to the method, the crystalline silicon cutting waste is used for ferromolybdenum smelting, ferrosilicon is replaced to serve as a reducing agent, the production cost in ferromolybdenum smelting is effectively reduced, and efficient and large-scale utilization of the crystalline silicon cutting waste is achieved.

Description

technical field [0001] The invention relates to the field of utilization and treatment of crystalline silicon cutting waste, in particular to a method for utilizing crystalline silicon cutting waste. Background technique [0002] Monocrystalline silicon and polycrystalline silicon are essential raw materials for the solar photovoltaic industry and the semiconductor industry. In practical applications, high-purity crystalline silicon ingots need to be cut into silicon wafers. During the cutting process, nearly 50% of the crystalline silicon will enter the cooling liquid to form cutting waste. With the development of the solar photovoltaic industry and the semiconductor industry, the waste discharge is increasing day by day, which will cause serious waste of resources and environmental pollution. The main components of the crystalline silicon cutting waste are metal silicon, silicon carbide and polyethylene glycol (PEG) solvent, wherein the metal silicon and silicon carbide e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B5/04C22C35/00
CPCC22B1/2406C22B5/04C22C35/005
Inventor 李小明吴育庆邢相栋臧旭媛阮锦榜马雨溦谢昊峰张馨艺
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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