Coal washing wastewater treatment agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of the coal chemical industry, and particularly relates to a coal washing wastewater treatment agent and a preparation method and application thereof. The coal washing wastewater treatment agent comprises modified molecular sieve powder, polyacrylamide, a natural polymeric flocculant, a surfactant and hydrogen peroxide, wherein the modified molecular sieve powder is composed of molecular sieve powder and calcium oxide, and pores of the modified molecular sieve powder contain calcium oxide; and the natural polymeric flocculant is one or a combination of more selected from the group consisting of a cationic starch derivative flocculant, an anionic starch derivative flocculant, an amphoteric starch derivative flocculant, a cationic lignin flocculant and an anionic lignin flocculant. According to the coal washing wastewater treatment agent disclosed by the invention, the polyacrylamide, the natural polymeric flocculant and the modified molecular sieve powder are matched for use, so the dosage of the polyacrylamide is reduced, metal ions such as iron and aluminum are not additionally introduced, and meanwhile, the coal washing wastewater treatment agent also has an excellent water purification effect.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a coal washing wastewater treatment agent, its preparation method and application. Background technique [0002] Coal washing is a coal processing link that separates raw coal with different components and different specific gravity into different grades through the impact of water flow, and removes dust and waste rocks to reduce the content of ash and sulfur. Coal washing will produce a large amount of coal washing wastewater. Coal washing wastewater has the characteristics of high SS, high COD concentration, extremely negative zeta potential, weak alkalinity, black ink color, and contains S, Fe, etc. It is heavy and difficult to deal with. The pollution caused by it is mainly manifested in the serious excess of suspended solids, which will silt up the river, hinder the growth of organisms, and the dyeing of coal will also cause landscape pollution. Therefore, it ...

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Problems solved by technology

Coal washing wastewater has the characteristics of high SS, high COD concentration, extremely negative zeta potential, weak alkalinity, black ink color, and contains S, Fe, etc. It is heavy and difficult to deal with. The pollution caused by it is mainly manifested in the serious excess of suspended solids, which will silt up the river, hinder the growth of organisms, and the dyeing of coal will also cause landscape pollution. Therefore, it must be purified to meet the national regulations. emission requirements

[0003] For the purification and treatment of coal washing wastewater, the key factor is to choose a suitable treatment agent. The treatment agents commonly used in the prior art include polyacrylamide, polyaluminum chloride, polymer Flocculant such as ferric chloride, polyacrylamide has the best flocculation purification effect, but it has strong neurotoxicity and carcinogenicity, and is not safe and environmentally friendly. It is necessary to minimize its dosage and avoid single use. Polyaluminum chloride and polychlorinated The flocculation effect of iron etc. needs to be further improved, and the inorganic salt flocculants containing iron and aluminum will increase the iron and aluminum content of water, which is not good for further purification of water quality

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