Device for recycling silicon powder and waste water from waste water from silicon cutting and method thereof

A waste water recovery and silicon cutting technology, which is applied in chemical instruments and methods, energy waste water treatment, water/sewage multi-stage treatment, etc., can solve the problems of failing to meet waste water standards or zero discharge, secondary pollution of the environment, and high operating costs. Achieve the effects of improving resource utilization, low operating costs, and alleviating environmental pollution problems

Inactive Publication Date: 2012-10-17
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of large investment, high operating cost, secondary pollution to the environment and inability to achieve waste water up to standard or zero discharge in existing silicon cutting waste water and waste water recycling technology, and to provide a method using electrolysis Silicon powder and waste water recovery and utilization device and method thereof in silicon cutting waste water combined with technology, centrifugal separation technology and filtration technology

Method used

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  • Device for recycling silicon powder and waste water from waste water from silicon cutting and method thereof
  • Device for recycling silicon powder and waste water from waste water from silicon cutting and method thereof
  • Device for recycling silicon powder and waste water from waste water from silicon cutting and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 1000 tons / day silicon powder and wastewater recycling project in silicon cutting wastewater.

[0041] The water quality of the silicon cutting wastewater is shown in Table 1.

[0042] Table 1 Water quality of silicon cutting wastewater

[0043]

[0044] Step 1. Electrolysis: start the water supply pump 12, and the sewage is 50m 3 The flow rate per hour enters the electrolysis machine 13 through the stop valve 11 for electrolysis, and then enters the buffer tank 14 for precipitation. The working voltage of the electrolysis machine is 12V, the voltage between the two poles is 3.5~8.0V, and the current density is 80mA / cm 2 , The residence time of wastewater in the electrolysis machine is 9-15min. Under the action of electric current, the nascent hydroxyl [OH] and nascent oxygen [O] and other strong oxidizing substances produced by electrolysis oxidize and decompose the organic matter in the wastewater to reduce COD , And make the suspended solids, colloids, and charged particles...

Embodiment 2

[0056] 2000 tons / day silicon powder and waste water recycling project in silicon cutting wastewater.

[0057] The water quality of the silicon cutting wastewater is shown in Table 4.

[0058] Table 4 Water quality of silicon cutting wastewater

[0059]

[0060] Step 1. Electrolysis: start the water supply pump 12, and the silicon cutting waste water is 100m 3 The flow rate per hour enters the electrolysis machine 13 through the stop valve 11 for electrolysis, and then enters the buffer tank 14 for precipitation. The working voltage of the electrolysis machine is 18V, the voltage between the two poles is 3.5~5.0V, and the current density is 120mA / cm 2 , The residence time of wastewater in the electrolysis machine is 5-8min. Under the action of electric current, the nascent hydroxyl [OH] and nascent oxygen [O] and other strong oxidizing substances produced by electrolysis oxidize and decompose the organic matter in the wastewater, and reduce COD , And make the suspended solids, colloi...

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Abstract

The invention discloses a device for recycling silicon powder and waste water from waste water from silicon cutting and a method thereof, which relate to waste water treatment. The device is provided with an electrolysis system, a centrifugal separation system, a drying system and a filtering system. After being pumped by a water pump, the waste water from silicon cutting is input into an electrolytic machine for electrolysis, and the electrolytic solution is input into a buffer tank to obtain electrolytic flocculation waste water; purified waste water treated by the electrolysis system is delivered to the centrifugal separation system by a pipe, so that materials with different sizes and densities are separated under the centrifugal force generated by the rotation of a centrifuge to formsilicon powder sediment and waste water; the silicon sediment obtained by the centrifugal separation system is placed in a dryer to reduce the water content in the silicon powder sediment by drying to obtain finished silicon powder; and the waste water obtained by the centrifugal separation system is lifted into a filtering device by the water pump to be filtrated and separated, and the filtrate obtained by filtering is filled into a recycled water tank to form recycled water.

Description

Technical field [0001] The invention relates to a waste water treatment, in particular to a device and a method for recycling silicon powder and waste water in silicon cutting waste water using a combination of electrolysis technology, centrifugal separation technology and filtering technology. Background technique [0002] With the rapid development of the semiconductor industry, high-purity crystalline silicon materials have been widely used. The crystalline silicon is first drawn into single crystal silicon rods, and then cut into silicon wafers for use in manufacturing chips. In recent years, as the global oil, coal and other energy sources have become increasingly tight, solar energy has gradually become the most important new energy source in this century. The global solar energy industry has entered a period of rapid development. When preparing solar cells, it is necessary to cast high-purity silicon into crystalline silicon ingots. , And then cut into silicon wafers, whet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C01B33/037C01B33/02C10M175/00
CPCY02W10/37
Inventor 张世文
Owner BOYING XIAMEN SCI & TECH
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