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Silicon solar cell texturization waste liquid recycling method

A silicon solar cell and waste liquid recycling technology, which is applied in the fields of energy and wastewater treatment, chemical instruments and methods, fluorosilicic acid, etc. Effect

Inactive Publication Date: 2017-09-01
ZHEJIANG DONGFU PLASTIC SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it brings solid waste CaF2, causing new pollution, and the saturation solubility of CaF2 in water is 16.5mg / L, which cannot meet the national wastewater discharge standard of 10mg / L

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] A method for recycling silicon solar cell texturing waste liquid, comprising the following steps:

[0016] The first step: the process of removing fluorosilicic acid, that is, putting the potassium salt or sodium salt into the reaction tank containing the waste liquid from texturing, and the weight ratio of the waste liquid to the added potassium salt or sodium salt is 1:1~ 1:1.5, the reaction is carried out at a temperature range of 10°C to 30°C, the materials are fully contacted by stirring or circulating with a pump for reaction, and then solid-liquid separation is carried out by filtration or centrifugation;

[0017] The second step: a purification process, the purification process is a process of purifying the above-mentioned treated waste liquid, and removing metal impurity ions by means of rectification.

[0018] As another improvement of the technical solution of the present invention, after the step 1, the step also includes:

[0019] HF / HNO3 separation proces...

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PUM

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Abstract

The invention discloses a silicon solar cell texturization waste liquid recycling method. The method includes: fluosilicic acid removing, HF / HNO3 separation, purification and other processes, can acquire a chemical stock solution level single chemical or mixed chemical used for a texturization process, and basically reduces discharge of waste chemicals.

Description

technical field [0001] The invention belongs to the field of recycling chemical waste liquid, and in particular relates to a method for recycling silicon solar battery texturing waste liquid. Background technique [0002] The texturing process of silicon solar cells is the process of pre-cleaning the silicon surface and corroding it into a pyramid-like or honeycomb-like structure with strong alkali or strong acid. The chemicals used in alkali texturing are mainly sodium hydroxide or potassium hydroxide, isopropanol or ethanol, sodium silicate or suede additives; the chemicals used in acid texturing are mainly nitric acid and hydrofluoric acid. Texture making process includes steps such as texturing, pickling, alkali washing, drying, etc. The waste water and liquid generated in the production process are mainly acid-base waste water, hydrofluoric acid waste water, and organic waste water. The invention is a method for recycling waste liquid produced in the texturing process ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B7/19C01B21/46C01B33/10
CPCC01B7/196C01B21/46C01B33/103C02F1/001C02F1/04C02F1/38C02F9/00Y02W10/37
Inventor 何正纲王燕董杰翁露霞
Owner ZHEJIANG DONGFU PLASTIC SCI & TECH
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