Treatment recovery method for monocrystalline silicon cutting waste liquor

A recovery method, single crystal silicon technology, applied in energy wastewater treatment, heating water/sewage treatment, silicon, etc., can solve the problem of not being found, and achieve the effect of low cost, good effect and easy operation

Inactive Publication Date: 2008-01-30
金柏林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no suitable waste liquid treatment and recycling method has been found, so domestic production plants can only pile up a large amount of waste liquid. With the continuo...

Method used

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  • Treatment recovery method for monocrystalline silicon cutting waste liquor
  • Treatment recovery method for monocrystalline silicon cutting waste liquor
  • Treatment recovery method for monocrystalline silicon cutting waste liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] See Figures 1-6 of the accompanying drawings. 50 kg of monocrystalline silicon cutting waste liquid from which kerosene has been removed and 10 liters of dilute hydrochloric acid with a concentration of 0.01 mol enter the first mixing tank 65 of the spray mixer 49 through the first feeding tank 63 and its first feeding pipe 69 . The passage of the first three-way valve 62 and the first nozzle passage 66 is opened, and the passage with the first discharge pipe 64 is closed, and the first diaphragm pump 61 (pneumatic diaphragm pump model QBY-40, manufactured by Shanghai Changquan Pump Industry) is started. Co., Ltd.), the air pressure is 3kg / cm 2 , the mixture flows out from the first outlet 67 at the bottom of the first mixing kettle 65 through the first diaphragm pump 61, the first pipeline 68 and the first three-way valve 62, and the nozzle diameter entering the first spray channel 66 is a nozzle 70 of 3mm , the mixed material is quickly ejected from the first nozzle ...

Embodiment 2

[0042] Add 50 kg of kerosene-free monocrystalline silicon cutting waste liquid and 15 liters of dilute hydrochloric acid with a concentration of 0.001 mol into the first mixing tank 65 of the spray agitator 49, and carry out repeated circulation of spray agitation and reaction for 20 minutes. The preliminary mixture obtained enters the spray mixer 50 for repeated cycle spray mixing and reaction for 20 minutes, the temperature rises to 50°C, the mixture enters the turbulent channel 11 in a turbulent state, the pump flow rate is 3 cubic meters per hour, and the diameter of the turbulent channel is 1.5mm , when the kinetic viscosity of the mixture is 40.6Pa·s, the Reynolds number is 9845. The secondary mixed material mixed by the spray mixer enters the solid-liquid separator 30, and the mixed material is heated by the electric heating plate of the two units whose temperature is maintained at 60 ° C. The water vapor and polyethylene glycol are steamed out together, and condensed to...

Embodiment 3

[0044] Add 50 kg of kerosene-removed monocrystalline silicon cutting waste liquid and 25 liters of dilute hydrochloric acid with a concentration of 0.0001 mol into the first mixing tank 65 of the spray mixer 49, and carry out repeated circulation of spray stirring and reaction for 30 minutes. The preliminary mixture obtained enters the spray mixer 50 for repeated cycle spray mixing and reaction for 10 minutes, the temperature rises to 40°C, the mixture enters the turbulent channel 11 in a turbulent state, the pump flow rate is 3 cubic meters per hour, and the diameter of the turbulent channel is 2.5mm , when the kinetic viscosity of the mixture is 28.4Pa·s, the Reynolds number is 3040. The secondary mixed material mixed by the spray mixer enters the solid-liquid separator 30, and the mixed material is heated by the electric heating plate of the two units whose temperature is maintained at 80 ° C. The water vapor and polyethylene glycol are steamed out together, and condensed to...

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Abstract

A treatment and reclaim method of single crystal silicon cutting waste liquid comprises the steps: (1). the waste liquid is treated with diluted hydrochloric acid then is stirred and mixed to enable the liquid to become a flowable mixture; (2). the mixed material is heated to separate solid and liquid, by which water and polyethylene glycol are extracted. The polyethylene glycol is obtained by the process of condensation, dehydration and recovery. The solid after being separated is a crude solid mixture of silicon carbide and silicon; (3). the quadratic-cleaning solid mixture of silicon diluted and silicon is obtained after quadratic cleaning to the crude solid mixture obtained in step 2; (4). the mixture is treated by mixed acid liquid comprising HNO3+HF to recover and get silicon diluted and silicon. The method has easy operation, simple equipment, low cost, high efficiency in treatment and recovery. The allover recovery rate calculated based on the weight of waste liquid can reach 26-46 percent and the recovering material can reach or close to the standard index, and can be directly used in solar energy battery production, so the invented method has good economic benefit and also can greatly contribute to environment protective, thereby having large exploration prospect.

Description

technical field [0001] The invention relates to a treatment and recovery method for monocrystalline silicon cutting waste liquid. Background technique [0002] With the increasing tension of energy and the aggravation of pollution, countries pay more attention to the use of clean energy. There is a wave of solar cell construction all over the world. The development of solar cells in my country has developed rapidly in recent years. The wide application of solar cells has prompted the rapid development of the production of monocrystalline silicon as the main raw material of solar cells. Monocrystalline silicon wafers used in solar cells are cut from single crystal silicon rods. During the cutting process of single crystal silicon rods, cutting fluid must be used for lubrication and cooling, so a large amount of cutting waste liquid is generated during the cutting process. At present, the cutting fluid commonly used in China is a mixture including polyethylene glycol, silicon...

Claims

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Application Information

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IPC IPC(8): C02F1/04C01B33/02C01B31/36
CPCY02W10/37
Inventor 金柏林陈钧陈丕烈
Owner 金柏林
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