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A method for purifying PEG from wire-cutting waste mortar

A waste mortar, wire cutting technology, applied in the direction of lubricating composition, etc., to achieve the effect of saving recycling cost, low energy consumption, reducing energy consumption and operation cycle

Active Publication Date: 2015-09-23
JIANGSU OXIRANCHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

reduce environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Stir the wire cutting waste slurry evenly, dilute it with water, and get the liquid phase part through the advection settling tank.

[0026] 2) Filter the above-mentioned liquid phase with a plate and frame filter press to remove solid particles, and use a 500-mesh filter cloth for the plate and frame.

[0027] 3) Pass the plate and frame filtered liquid through a precision filter with a pore size of 0.8um.

[0028] 4) Pass the finely filtered liquid in the previous step through a strong acid and strong base ion exchange resin, and the final liquid conductivity is 3us / cm.

[0029] 5) Pump the liquid treated with the resin in the previous step into the membrane vacuum distillation equipment for dehydration. The membrane is made of polyethylene membrane, and the membrane module is hollow fiber type. The final PEG water content is <0.5%.

Embodiment 2

[0031] 1) Stir the wire cutting waste slurry evenly, dilute it with water, and get the liquid phase through the radial flow sedimentation tank.

[0032] 2) Filter the above-mentioned liquid phase with a plate and frame filter press to remove solid particles, and use a 1000-mesh filter cloth for the plate and frame.

[0033] 3) Pass the plate and frame filtered liquid through a precision filter with a pore size of 0.9um.

[0034] 4) Pass the finely filtered liquid in the previous step through a strong acid and strong base ion exchange resin, and the final liquid conductivity is 4us / cm.

[0035] 5) Pump the liquid treated with the resin in the previous step into the membrane vacuum distillation equipment for dehydration. The membrane is made of polypropylene membrane, and the membrane module is made of tubular module. Final PEG moisture content <0.5%.

Embodiment 3

[0037] 1) Stir the wire cutting waste slurry evenly, dilute it with water, and get the liquid phase part through the vertical flow sedimentation tank.

[0038] 2) Filter the above-mentioned liquid phase with a plate and frame filter press to remove solid particles, and use a 7500-mesh filter cloth for the plate and frame.

[0039] 3) Pass the plate and frame filtered liquid through a precision filter with a pore size of 0.8um.

[0040] 4) Pass the finely filtered liquid in the previous step through a strong acid and strong base ion exchange resin, and the final liquid conductivity is 5us / cm.

[0041] 5) Pump the liquid treated with the resin in the previous step into the membrane vacuum distillation equipment for dehydration. The membrane is made of polytetrafluoroethylene membrane, and the membrane module is a plate-and-frame module. The final PEG water content is less than 0.5%.

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PUM

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Abstract

The invention relates to a method for purifying PEG from wire cutting waste mortar. The process first adds water to the waste mortar and separates the solid from the liquid through natural sedimentation. The obtained liquid part is subjected to half-frame press filtration, precision filtration, ion exchange resin treatment, and vacuum membrane distillation to finally obtain the PEG product. The advantage of this process is that PEG water removal adopts membrane vacuum distillation, which has low energy consumption, and qualified PEG products can be obtained by one-step distillation. Reduced energy consumption and operating cycle, saving recycling costs.

Description

technical field [0001] The invention relates to a recycling technology for wire-cutting waste mortar, and is especially suitable for recycling PEG waste liquid contained in wire-cutting slurry in a silicon wafer processing technology. Background technique [0002] As an important link in the photovoltaic industry chain, wire cutting mortar will be produced during the cutting process of crystalline silicon wafers. Wire cutting mortar is a mixture of silicon micropowder, silicon carbide, iron filings and cutting fluid. According to statistics, about 57.6 tons of wire-cut mortar are produced for every 1MW silicon wafer produced. With the rapid increase in the output of crystalline silicon wafers, more and more wire cutting mortars are formed from the crystalline silicon wafer cutting blades and cutting fluids used in the cutting process. Wire cutting mortar is a kind of industrial waste, if it is not treated, it will cause serious pollution; at the same time, the silicon carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M175/06C08G65/34
Inventor 朱建民刘兆滨董振鹏富扬刘丙柱
Owner JIANGSU OXIRANCHEM CO LTD
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