Comprehensive utilization method of wastes from production of polycrystalline silicon

Abstract

The invention belongs to the technical field of waste residue recycling and particularly relates to the technical field of preparation of building blocks by recycling of polycrystalline silicon wasteresidues. The method comprises the following steps: putting wastes produced in the production process of the polycrystalline silicon into a leaching pool, after hydrolysis, alkali liquid spraying andabsorption and neutralization, primarily forming waste residues in the leaching pool, adding tap water according to the mass ratio of leached waste residues to water being (1-3):1, and stirring to obtain slurry; and adding the following components: 20-26 parts of phosphorus slag residues, 17-19 parts of organic silicon waste residue slurry, 14-16 parts of natural siderite, 4-11 parts of cement, 5-7 parts of gypsum into feed liquid, carrying out filtering press to obtain insoluble residues, storing, rolling uniformly by using wheels, then carrying out compression molding, and carrying out autoclaved curing to prepare an unfired type building block. The preparation of the building blocks consumes a large amount of polycrystalline silicon waste residues and tailing sand, the utilization rateof the waste residues is 86% or above, the wastes are changed into valuables, and chemical pollution sources are changed into usable resources, so that the energy-saving and environment-friendly benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of waste slag, in particular to the technical field of resource utilization of polysilicon waste slag to prepare building blocks. Background technique [0002] Polysilicon waste residue is a kind of industrial solid waste deposited in the process of treating polysilicon production sewage. The main component is elemental silicon, a small amount of CaCO3, amorphous substances containing Al and Fe, and the flocculant polyacrylamide (PAM) used in sewage treatment. . Since polysilicon waste slag contains impurities such as organic matter, its recycling has been limited, and now the main treatment methods are landfill and stacking. The stacking of polysilicon waste has seriously endangered the surrounding environment, such as the atmosphere, soil, groundwater, etc., and almost no grass grows in the place where polysilicon waste is stacked. As the state strengthens environmental protection...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the prior art, the present invention provides a polysilicon solid waste slag recycling treatment method, which uses polysilicon waste slag to prepare building blocks, thereby providing a technology for solving the environmental pollution problems caused by the discharge and accumulation of polysilicon waste slag At the same time, building blocks with excellent performance can be produced to meet the market demand for new building materials