GCL method polycrystalline silicon production whole process comprehensive water-saving production system and method

Abstract

The invention discloses a GCL method polycrystalline silicon production whole process comprehensive water-saving production system and method. Water and drainage of living and production systems are comprehensively optimized, all schemes for water use of polycrystalline silicon enterprises and drainage treatment are systematically balanced, purified water, desalted water, reclaimed water and the like used in devices finally flow to a sewage station, high-salt sewage passes through a flocculation system, a sedimentation system, an air flotation system, a multi-medium filtration system and an MVR evaporative crystallization system, generated high-quality reuse water serves as inlet water of a desalted water station, solid-state carnallite generated by the crystallization system is transported outwards for separate treatment, the sewage is reused to the maximum extent, the comprehensive utilization rate of distillate is treated to be 90% or above, the comprehensive utilization rate of desalted water is treated to be 85% or above, the dilemma of serious water resource shortage in remote water-deficient areas is relieved, and water resources are saved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a comprehensive water-saving production method and system in the whole process of GCL polysilicon production. Background technique [0002] At present, the comprehensive water consumption of domestic polysilicon manufacturers in the same industry is generally 150-200 tons per ton of polysilicon. In recent years, domestic large-scale polysilicon enterprises have expanded their construction to Xinjiang, Inner Mongolia and other areas with low electricity prices. However, these areas are remote, dry, and water resources are extremely scarce, and the winter is cold and long, and there are few municipal sewage treatment plants. From the perspective of cost saving or environmental protection, the comprehensive water saving of the production process is a problem that plagues the development of enterprises. [0003] The water consumed in the process of polys...

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Problems solved by technology

[0008]With the technological progress of the photovoltaic industry and the increasing sales volume of the polysilicon market, in recent years, domestic large-scale polysilicon enterprises have expanded to Xinjiang, Inner Mongolia and other western regions. Obviously, but they are all in arid areas with relatively scarce water resources, and the municipal supporting facilities are seriously insufficient

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