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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

Active Publication Date: 2022-01-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ability of the method involved in the patent to solidify chloride ions is mainly due to the physical adsorption generated by the rich specific surface area of ​​the modified zeolite. This method has limited curing ability and is difficult to deal with desulfurized gypsum with high chloride ion content.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 7 parts of Q-phase modified fly ash, 3 parts of starch-modified zeolite powder, 2 parts of calcined clay, and 0.5 part of retarder.

[0048] Among them, Q phase modified fly ash is to control the mass fraction of Q phase in the range of 65%, mix with excited fly ash in the ball mill at a speed of 500rpm for 150min, and the excited fly ash is fly ash passing through 6mol / L The sodium hydroxide solution was excited for 180min and washed with water to a product with a pH of 8.

[0049] Starch-modified zeolite powder is mixed with modified zeolite powder and modified starch with a water content of 40% in a mixer with a rotation speed of 200rpm for 240min, wherein the mass fraction of modified zeolite powder is 97% of the mixture, and then dried Can do it. Modified zeolite powder is obtained by calcining natural zeolite powder at 300°C and washing with water to remove organic matter. The specific surface area of ​​modified zeolite powder is not less than 100m 2 / g.

[005...

Embodiment 2

[0054] 11 parts of Q-phase modified fly ash, 5 parts of starch-modified zeolite powder, 3 parts of calcined clay, and 0.6 part of retarder. The source of each component is the same as in Example 1.

[0055] Mix the above-mentioned mineral admixture with the plaster made from flue gas desulfurization gypsum evenly, and prepare the gypsum slurry according to the water consumption of the standard consistency. The slurry is poured into a steel mold of 20×20×20mm for molding. After the mold is removed, it is naturally cured to the specified age. The obtained gypsum is qualified gypsum that meets the national standard GB / T 37785 third-grade desulfurization gypsum 600ppm. Refer to the national standard method to test the detected content of chloride ions, and the results are shown in Table 1 below.

Embodiment 3

[0057] 15 parts of Q-phase modified fly ash, 7 parts of starch-modified zeolite powder, 4 parts of calcined clay, and 0.7 parts of retarder. The source of each component is the same as in Example 1.

[0058] Mix the above-mentioned mineral admixture with the plaster made from flue gas desulfurization gypsum evenly, and prepare the gypsum slurry according to the water consumption of the standard consistency. The slurry is poured into a steel mold of 20×20×20mm for molding. After the mold is removed, it is naturally cured to the specified age. The obtained gypsum is qualified gypsum that meets the national standard GB / T 37785 third-grade desulfurization gypsum 600ppm. Refer to the national standard method to test the detected content of chloride ions, and the results are shown in Table 1 below.

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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.

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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Application Information

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IPC IPC(8): C04B24/38C04B28/14C04B111/20C04B103/60
CPCC04B40/0039C04B28/144C04B2111/00017C04B2103/60C04B2111/20C04B22/0006C04B22/08C04B24/38C04B2103/22
Inventor 杨露武春夏王发洲杨正波陈红霞王兵李帆胡曙光
Owner WUHAN UNIV OF TECH
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