Functional admixture for treating desulfurized gypsum with high chloride ion content as well as preparation method and application of functional admixture

A technology for desulfurization gypsum and ion content, applied in the field of building materials, can solve problems such as limited curing capacity and difficulty in dealing with desulfurization gypsum, achieve the effect of reducing industrial costs, good application prospects, and improving the curing efficiency of chloride ions
CN113979665AActive Publication Date: 2022-01-28WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
WUHAN UNIV OF TECH
Publication Date
2022-01-28

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Abstract

The invention relates to a functional admixture for treating desulfurized gypsum with high chloride ion content and a preparation method and application of the functional admixture, and the functional admixture comprises the following components in parts by mass: 5-35 parts of Q-phase modified fly ash, 1-10 parts of starch modified zeolite powder, 1-8 parts of calcined clay and 0.5-1 part of a retarder. A composite mineral admixture formed by the Q-phase modified fly ash, the starch modified zeolite powder, the calcined clay and the retarder is doped into the desulfurized gypsum to form a close packing effect, a low alkalinity characteristic and a synergetic hydration characteristic, a hydration product with the low alkalinity characteristic and efficient physical adsorption capacity is formed, migration and diffusion of chloride ions can be effectively limited, the chloride ion curing efficiency of the desulfurized gypsum is greatly improved, and the problems that the overall porosity and fracture toughness of a gypsum-based material are insufficient are solved.
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Description

technical field

[0001] The invention relates to the field of building materials, in particular to a functional admixture for treating desulfurized gypsum with high chloride ion content, a preparation method and an application thereof. Background technique

[0002] At present, there is a huge stock of desulfurized gypsum in my country, which not only occupies land but also pollutes water sources. Desulfurized gypsum can replace natural gypsum to produce gypsum products, but the main impurity chloride ion contained in it will affect the use of gypsum products. Chloride ions will cause problems such as difficulty in dehydration, moisture absorption and strength loss of gypsum products. The industrial treatment method for reducing chloride ions in flue gas desulfurization gypsum is water washing method, but this method consumes more water resources and energy.

[0003] As far as the immobilization of chloride ions is concerned, its essence is to limit the free migration and di...

Claims

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