Silicon carbide composite zero-valent iron porous ceramics for sewage treatment and preparing method

Abstract

The invention relates to silicon carbide composite zero-valent iron porous ceramics for sewage treatment and a preparing method. The porous ceramics is prepared by uniformly mixing, by mass, 60-90 parts of silicon carbide micro powder, 5-25 parts of zero-valent iron power, 1-5 parts of glass powder, 3-20 parts of carbon powder, 1-8 parts of graphite, 0.1-0.5 part of ethanediol, 0.1-0.5 part of ammonium polyacrylate, 2-10 parts of polyvinyl alcohol and water, then spray granulation is carried out, a blank is manufactured, and under the protection of nitrogen, the blank is sintered for 1 h at the temperature of 1350-1400 DEG C and cooled to the room temperature to obtain the silicon carbide composite zero-valent iron porous ceramics for sewage treatment. The zero-valent iron is compounded into the ceramics and has the advantages of being low in toxicity, low in price, easy to operate, environmentally friendly and free of secondary pollution. The porous ceramics is simple in process, low in cost, capable of being produced on a large scale and applied to a practical sewage treatment project, and the problems that in the prior art, secondary pollution is caused as the treatment effect is unobvious and not thorough are solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental protection materials, and relates to a silicon carbide composite zero-valent iron porous ceramic for sewage treatment and a preparation method thereof. Background technique [0002] Silicon carbide has the characteristics of low density, high strength, corrosion resistance, oxidation resistance, good thermal conductivity, high temperature resistance, etc. Zero-valent iron can easily lose electrons and has good reducibility. After the two materials are combined to form a new functional material with many pores in the internal structure, it can be widely used in the field of sewage treatment. [0003] There are many methods for preparing silicon carbide porous ceramics, including fiber drawing process, organic foam impregnation process, chemical deposition process, etc., but these methods are relatively complicated, it is not easy to carry out large-scale industrial production, ...

AI Technical Summary

Problems solved by technology

[0003] There are many methods for preparing silicon carbide porous ceramics, including fiber drawing process, organic foam impregnation process, chemical deposition process, etc., but these methods are relatively complicated, it is not easy to carry out large-scale industrial production, and the cost is high

[0004] Traditional sewage treatment and polluted soil treatment require a series of complicated processes such as filtration, neutralization reaction, resin adsorption, and chemical precipitation. The workload is heavy, the treatment effect is not obvious, not thorough, and even causes secondary pollution.