Method for recovering and recycling silicon slice cutting waste mortar

A silicon chip cutting and waste mortar technology, applied in the direction of lubricating composition, etc., can solve the problems of sewage COD increase, long maintenance time, high production cost, etc., and achieve the effect of reducing COD content, reducing labor intensity and reducing maintenance cost

Inactive Publication Date: 2011-05-25
JIANGSU HAOBO NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First of all, the solid-liquid separation of mortar by centrifugal equipment is too low to meet the expected production requirements, and the centrifugal equipment is easy to wear, the maintenance cost is high, and the maintenance time is too long;
[0005] Secondly, the conductivity of the PEG product liquid recovered by this method is 15-20 μs/cm, which cannot effectively reduce the conductivity of the recovered PEG product liquid, and its moisture content is high, so it is difficult to meet the actual conductivity re...

Method used

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  • Method for recovering and recycling silicon slice cutting waste mortar
  • Method for recovering and recycling silicon slice cutting waste mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention relates to a method for recycling waste mortar for cutting silicon wafers, said method comprising the following process steps:

[0024] Step 1. Preprocessing:

[0025] Mortar mixing, according to the ratio of raw pulp and water 1:0.35~0.55 for effective and uniform stirring, and at the same time, use steam to heat the mortar to 50-60°C; then use a plate and frame filter press for solid-liquid separation;

[0026] Step 2, recovery of PEG:

[0027] Add a decolorizer to the filtered liquid, and heat the liquid at the same time. The temperature is controlled at 55-65°C, stirred for 35-45 minutes, and then plate and frame filtered. The obtained filtrate is exchanged with an ion exchange resin; The exchanged liquid undergoes multi-effect distillation to reduce the moisture in the liquid to 15-20%, then undergoes vacuum distillation to control the moisture below 5%, and then undergoes rectification to control the moisture below 0.5%, and finally uses the filter ...

Embodiment 2

[0033] As a preferred version of the present invention, the difference from Example 1 is:

[0034] In step 1, effective and uniform stirring is carried out according to the ratio of raw pulp to water 1:0.45, and at the same time, the mortar is heated to 55°C with steam; and then the solid-liquid separation is carried out by using a plate and frame filter press;

[0035] Step 2, recovery of PEG:

[0036] Add a decolorizing agent to the filtered liquid, the added decolorizing agent is made of activated carbon accounting for 0.5% of the total weight of the liquid and 0.3% clay, while heating the liquid, the temperature is controlled at 60 ° C, stirred for 40 minutes, and then Carry out plate and frame filtration, and the obtained filtrate is exchanged by ion exchange resin; then the ion-exchanged liquid is subjected to multi-effect distillation to reduce the moisture in the liquid to 15-20%, and then the pressure is 0.09Mpa, and the temperature is 85°C. Under reduced pressure di...

Embodiment 3

[0038] The difference with embodiment 1 is:

[0039] In step 3, the separated solids are pickled again to remove metal oxides; Tandem settings.

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Abstract

The invention relates to a method for recovering and recycling silicon slice cutting waste mortar. The method is characterized by comprising the following steps of: 1, pre-treating: uniformly stirring raw mortar and water and performing solid-liquid separation by using a plate and frame type filter press; 2, recovering polyethylene glycol (PEG): adding a decoloring agent into filtered liquid, and performing plate and frame filtering; treating obtained filtrate by using ion exchange resin or a multiple-effect distiller; and performing reduced pressure distillation, rectification and fine filtering to obtain a PEG finished product; and 3, recovering silicon carbide: mixing filtered filter cakes and water according to a proportion of 1:(3-4), stirring to form mortar; separating the mortar by using a multi-stage cyclone; performing acid washing; separating by using the cyclone; filtering by using a belt filter; and drying to obtain the silicon carbide finished product. By the method, the separation amount is large, recovery rate is high, recovered PEG and silicon carbide have high quality, and the method saves energy and is environmentally-friendly.

Description

technical field [0001] The invention relates to a recycling method for silicon chip cutting waste mortar, which is mainly used for processing the waste mortar produced after silicon chip cutting, and recovering PEG and silicon carbide therein. Background technique [0002] With the depletion of non-renewable resources such as coal and oil, solar energy has received strong support from governments of various countries as a new energy source, and the solar photovoltaic industry has developed rapidly, and its related industries have also followed. Chip cutting manufacturers are also increasing rapidly, and a large amount of mixed mortar waste containing polyethylene glycol (PEG), silicon carbide (SiC), silicon powder, metal oxides, moisture, metal ions, free carbon, etc. is produced during the process of cutting silicon wafers , the resulting mortar cannot be disposed of in time, causing great pressure on enterprises and environmental protection. [0003] Chinese patent docume...

Claims

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Application Information

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IPC IPC(8): C10M175/00C01B31/36
Inventor 沈志伟
Owner JIANGSU HAOBO NEW MATERIALS CO LTD
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