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Recovery method of slurry

A recycling method and slurry technology, applied in the field of solar cells, can solve the problems of limited recyclable capacity and low recovery rate

Active Publication Date: 2014-05-07
JINKO SOLAR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the limited ability to obtain recyclables through the above-mentioned means makes the recovery rate low

Method used

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  • Recovery method of slurry
  • Recovery method of slurry

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Embodiment Construction

[0034] The core of the invention is to provide a slurry recovery method to improve the recovery rate.

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] Please refer to figure 1 , the invention discloses a slurry recovery method for recovering polyethylene glycol and silicon carbide powder in the slurry, which comprises the following steps:

[0037] Step S 1: adjust the density of the initial slurry to obtain the pretreated slurry;

[0038] Since the density of the initial slurry discharged from the high-efficiency tank 1 is generally ρ=1.60-1.70g / ml, and the moisture content is ≤4%, it cannot meet the separation density requirements, so polyethylene glycol is added to the initial slurry , make the density of the initial slurry reach the first density value to obtain the pretreate...

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Abstract

The invention discloses a recovery method of slurry, which is used for recovering polyoxyalkylene and carborundum powder in the slurry. The recovery method comprises the following steps that the density of initial slurry is adjusted to obtain pretreated slurry; the pretreated slurry is subjected to primary fractionation to obtain carborundum and first suspension liquid; the first suspension liquid is subjected to secondary fractionation to obtain the carborundum and second suspension liquid; the second suspension liquid is filtered to obtain the polyoxyalkylene and filter residues; and the filter residues are subjected to off-line separation to obtain the polyoxyalkylene and the filter residues. According to the recovery method, as the first suspension liquid obtained after the primary fractionation is subjected to the secondary fractionation, the recovery rate of the carborundum is increased. As the second suspension liquid after the secondary fractionation is filtered, the suspension liquid is further recovered; and the filter residues after the secondary fractionation is further recovered. Therefore, with the adoption of the recovery method, the recovery rate is increased greatly.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a slurry recovery method. Background technique [0002] Cutting silicon wafers requires a large amount of cutting fluid. During the polysilicon wire cutting process, 40% to 50% of the polysilicon chips are brought into the SiC (silicon carbide) slurry. If the waste cutting fluid is directly discarded, it will cause great waste. The composition of waste mortar is: 35% of PEG (polyethylene glycol), 33% of silicon carbide micropowder and other substances. If the waste slurry is recycled, it can not only alleviate the tension of silicon raw materials, but also reduce the direct discharge of old slurry to the pollution of the environment. [0003] The recovery of polysilicon cutting waste slurry is mainly to recover polyethylene glycol and silicon carbide in the slurry. At present, the recovery process in the slurry recycling industry mainly adopts online recovery, which specifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M175/00C01B31/36C08G65/34C01B32/956
Inventor 罗文斌朱伟杰胡杉林李淳伟齐平
Owner JINKO SOLAR CO LTD
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