Ingot casting circulation material cleaning and treating method

Abstract

The invention discloses an ingot casting circulation material cleaning and treating method. The method includes the process steps of preparing mixed liquor, soaking, washing, carrying out acid neutralization, rinsing, carrying out ultrasonic cleaning, and drying in sequence. Light alkali mixed solution prepared through mixing of caustic soda flakes and cleaning agents is utilized to replace original strong acid solution to carry out cleaning treatment on ingot casting circulation materials. Consequently, harm of the strong acid solution to body health of operators and the ambient environment is avoided, and safety of the whole cleaning process is greatly improved. Moreover, the liquid waste disposal difficulty of the light alkali mixed solution is low, and the liquid waste of the light alkali mixed solution is subjected to appropriate acid neutralization treatment and can be directly discharged only through utilization of diluted hydrochloric acid or diluted hydrofluoric acid. The whole treating process is environment-friendly. Meanwhile, the light alkali mixed solution is simple and feasible in preparation and low in manufacturing cost, and consequently the whole cleaning and treating cost of the ingot casting circulation materials is correspondingly reduced.

Description

technical field [0001] The invention relates to the technical field of silicon material surface treatment, in particular to a cleaning treatment method for ingot circulating material. Background technique [0002] During the processing and production of polycrystalline ingots in the solar industry, the surface of the ingot recycling material is usually attached with residual mortar and cutting fluid after cutting operations, as well as some metal impurities and other non-silicon substances. The existence of these impurities It will greatly affect the subsequent processing operations and the quality of silicon ingot manufacturing. In order to remove these impurities, manufacturers generally implement corresponding cleaning measures for silicon ingots. [0003] At present, the cleaning treatment process of the existing ingot circulating material is usually to immerse the ingot circulating material to be cleaned in a mixed solution prepared by hydrofluoric acid and nitric acid...

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Problems solved by technology

[0004] However, although the above-mentioned cleaning treatment methods can meet the basic production and processing needs, due to the strong corrosiveness of the mixed solution of hydrofluoric acid and nitric acid, the processing process will have adverse effects on the health of operators and the surrounding environment

At the same time, the use cost of the mixed solution of hydrofluoric acid and nitric acid is relatively high, resulting in the high cost of overall cleaning treatment of ingot recycling materials, and the treatment of strong acid waste liquid is difficult, and the environmental protection pressure of waste liquid discharge is relatively high

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