Resourceful treatment process for silicon-containing wastewater

Abstract

The invention provides a resourceful treatment process for silicon-containing wastewater. The resourceful treatment process comprises the following steps: (1) heating and boiling the silicon-containing wastewater for 15-30 minutes; (2) separating the boiled wastewater through a ceramic membrane device to obtain a permeate liquid and a concentrated liquid, wherein the permeate liquid is a PEG solution and the concentrated liquid is a solution with high a suspended matter content; (3) introducing the concentrated liquid into a concentration tank for concentration; (4) firing the sludge at the bottom of the concentration tank at high temperature to obtain waste sand containing SiC, Si and Fe2O3; and (5) sequentially carrying out acid dissolution and alkali dissolution on the waste sand, and conducting rinsing and drying to obtain SiC micro-powder. According to the method, high-temperature boiling and membrane separation via the ceramic membrane device are carried out in sequence, then high-temperature firing is carried out through a high-temperature furnace, and finally, acid dissolution and alkali dissolution are carried out through an acid pool and an alkali pool respectively, so resourceful treatment can be effectively carried out on the silicon-containing wastewater, the purity of the obtained PEG solution and SiC micro-powder is obviously improved, and the risk of enrichment of other impurities is also avoided in the recycling process of the re-prepared cutting fluid.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and relates to a silicon-containing waste water resource treatment process. Background technique [0002] With the increasing shortage of oil, natural gas, coal and other resources, the utilization of solar energy resources is increasing. Due to its renewable and clean characteristics, it is favored by various countries. All over the world, there has been an upsurge in paying attention to and constructing and utilizing solar energy. The Chinese government has recently attached great importance to the research and utilization of solar energy resources, and the National Development and Reform Commission has also frequently issued policies to strongly support the photovoltaic industry. Therefore, it has promoted the rapid development of the photovoltaic silicon plate industry as the solar photovoltaic industry and its raw material industry. Silicon materials generally exist in the fo...

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Problems solved by technology

If the waste cutting fluid enters the sewage treatment system, the general sewage treatment method is difficult to work on it. Not only the COD value is too high and it is difficult to deal with it, but the large amount of silicon carbide contained in the cutting fluid will generate a large amount of sludge, which will also cause a large amount of waste to be treated. waste cutting fluid

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