Method for grinding cement admixture and grinding aid for cement admixture

Abstract

The invention provides a cement mixture grinding method and a cement mixture grinding aid. The method is characterized in that a cement mixture to be ground and the cement mixture grinding aid are ground, wherein the cement mixture grinding aid contains a waste liquid obtained after production of caprolactam from cyclohexanone. The cement mixture grinding method adopts the waste liquid obtained after production of caprolactam from cyclohexanone as the cement mixture grinding aid to carry out cement mixture grinding.

Description

technical field [0001] The invention relates to a method for grinding cement admixture and a grinding aid for cement admixture. Background technique [0002] In order to improve cement performance, adjust cement strength grade, increase cement production, etc., artificial or natural mineral materials are added, which is called cement mixture. Most of the currently used cement mixtures are industrial waste residues. Mixed materials are usually divided into two categories: active mixed materials and inactive mixed materials according to their different properties, among which active mixed materials are used in the largest amount. Commonly used active mixed materials include granulated blast furnace slag, pozzolanic mixed materials and fly ash, etc., while inactive mixed materials include fine powder ground from quartzite, sandstone, etc. In the production process, the grinding process consumes a lot of energy, and the utilization rate of energy is extremely low, resulting in...

AI Technical Summary

Problems solved by technology

[0003] The process of producing caprolactam through oximation and rearrangement reaction of cyclohexanone, due to the by-products of inorganic salts such as ammonium phosphate, ammonium sulfate, and sodium nitrate, in addition to the above two-step main reaction, it also includes extraction, stripping, ion exchange, rectification, etc. Multiple product refining steps, these steps will produce their own waste liquids while the products are refined, such as refining caprolactam and ammonium sulfate through extraction methods, and the waste liquids including caprolactam and ammonium sulfate chemical components will be brought into the extraction waste liquid, these The waste liquid is collectively referred to as the waste liquid from the production of caprolactam from cyclohexanone. The national total amount of the waste liquid is about 500,000 tons / year (in terms of 50% by weight concentration), and the COD is high, so it cannot be directly biochemically treated.

The currently widely used incineration method not only has a large investment and energy consumption, but also has a certain environmental impact, and it is also a waste of resources.

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