Method for chemically conditioning chlorine-containing salt mud

Abstract

The invention provides a method for chemically conditioning chlorine-containing salt mud, which comprises the following steps: S1) taking chlorine-containing salt mud, recording the chlorine-containing salt mud as N0, and carrying out chemical conditioning pretreatment on the chlorine-containing salt mud by oxalic acid to obtain N1; s2) carrying out secondary chemical conditioning pretreatment on the N1 by adopting boric acid or borate to obtain N2; s3) mixing N2 with fly ash, and performing wheel milling to obtain N3; s4, N3 is aged and then mixed with industrial waste residues, and N4 is obtained; s5) mixing the N4, cement and a liquid activator to obtain N5; s6) mixing N5, boric acid or borate and alcohol ether phosphate to obtain N6; and S7) pressurizing and curing the N6 to obtain the treated chlorine-containing salt mud. The invention provides a chemical conditioning method for modifying chlorine-containing salt mud particles, and the chlorine-containing salt mud particles are synergistically compatible with other industrial wastes rich in silicon and aluminum.

Description

technical field [0001] The invention relates to the technical field of solid waste recovery and treatment, in particular to a method for chemically conditioning chlorine-containing salt mud. Background technique [0002] Chlor-alkali industry refers to the process of preparing sodium hydroxide (caustic soda), chlorine and hydrogen by electrolysis of saturated sodium chloride solution, and using them as raw materials to produce a series of chemical products. The chlor-alkali industry uses sea salt as the main raw material. After the crude salt is initially extracted and the mud discharged from the subsequent process is filtered and dehydrated by a filter press, it forms a solid with a low water content. About 50-60kg of salt mud is produced. At present, the annual production of salt mud in the country has reached several million tons. The resource utilization of salt mud has always troubled the healthy development of chlor-alkali enterprises. Considering investment and opera...

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Problems solved by technology

Because many technologies are still immature, there are problems such as complex process, high cost, high energy consumption, and easy to cause secondary pollution, so many technologies and applications are still in the experimental stage

[0004] The chlorine content in the salt mud of the chlor-alkali industry is as high as 10%, and the existence of chloride ions seriously affects the resource reuse of salt mud

Chloride ions can significantly reduce the strength of concrete. When salt mud is used as a building material in the preparation process, there are strict requirements on the amount of salt mud added. The relevant specifications for concrete additives require cementitious materials (including cement, fly ash, mineral powder , admixture), the chloride ion content is not more than 0.06%, which greatly limits the resource reuse of salt mud

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