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Hemihydrate building gypsum coagulant and preparation method and application thereof

A technology of building gypsum and coagulation accelerator, which is applied in the field of mineral processing, can solve the problems of easy failure and difficulty of semi-hydrated building gypsum, poor coagulation effect, uniform mixing, etc., and achieve significant induction of crystallization, good application prospects, and coagulation acceleration high efficiency effect

Inactive Publication Date: 2019-04-12
YANGTZE NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a semi-aqueous building gypsum coagulant and its preparation method and application, so as to solve the problem of existing gypsum coagulant with high cost, complicated operation and poor coagulation effect. , easy to fail and difficult to mix evenly in semi-hydrated building plaster in actual use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Compound calcium nitrate and clean quartz sand according to the mass ratio of 1:20, and then use JJ-type cement mortar mixer for premixing, where the stirring speed is 285±10rpm, and the premixing time is controlled to be 2~5min. After premixing, use a ball mill to perform ball milling to obtain fine powder. The time for ball milling is controlled to be 10 minutes; According to the methods and steps stipulated in GB8074-2008 "Method for Determination of Specific Surface Area of ​​Cement Blaine Method", the Blaine specific surface area analyzer is used to measure the specific surface area of ​​the ground sample, and the specific surface area of ​​the ground powder is controlled to be ≥ 400m 2 / kg, the powder masterbatch is obtained.

[0029] 2) Use a water pump with a metering device to inject a certain amount of tap water in compliance with the "Drinking Water Hygienic Standard" (GB5749-2006) into the open polyethylene acid-resistant storage tank by pumping; use a pr...

Embodiment 2

[0033] 1) Calcium bicarbonate, calcium gluconate and clean quartz sand are compounded according to the mass ratio of 1:30, and then premixed with JJ-type cement mortar mixer, where the stirring speed is 285±10rpm, and the premixing time is controlled as 2~5min, after premixing, use a ball mill for ball milling to obtain fine powder, and the control time of ball milling is 20min; After the end, according to the methods and steps stipulated in GB8074-2008 "Methods for Determination of Cement Specific Surface Area Blaine Method", the Blaine Specific Surface Area Analyzer is used to measure the specific surface area of ​​the ground sample, and the specific surface area of ​​the ground powder is controlled. Surface area ≥ 400m 2 / kg, the powder masterbatch is obtained.

[0034] 2) Use a water pump with a metering device to inject a certain amount of tap water in compliance with the "Drinking Water Hygienic Standard" (GB5749-2006) into the open polyethylene acid-resistant storage t...

Embodiment 3

[0038] 1) Calcium chloride and clean quartz sand are compounded according to the mass ratio of 1:50, and then premixed with JJ-type cement mortar mixer, where the stirring speed is 285±10rpm, and the premixing time is controlled to be 2~5min. After premixing, use a ball mill to perform ball milling to obtain fine powder. The time for ball milling is controlled to be 30 minutes; According to the methods and steps stipulated in GB8074-2008 "Method for Determination of Specific Surface Area of ​​Cement Blaine Method", the Blaine specific surface area analyzer is used to measure the specific surface area of ​​the ground sample, and the specific surface area of ​​the ground powder is controlled to be ≥ 400m 2 / kg, the powder masterbatch is obtained.

[0039] 2) Use a water pump with a metering device to inject a certain amount of tap water in compliance with the "Drinking Water Hygienic Standard" (GB5749-2006) into the open polyethylene acid-resistant storage tank by pumping; use a...

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Abstract

The invention discloses a hemihydrate building gypsum coagulant and a preparation method and application thereof. The coagulant comprises mother liquor and powdery master batch, wherein the powdery master batch comprises soluble calcium salts; and the mother liquor is a sulfuric acid solution. The soluble calcium salts are matched with dilute sulfuric acid with a certain concentration to improve the concentration of calcium ions and sulfate ions in the fluid phase of the hemihydrate gypsum slurry so as to rapidly reach the supersaturation degree of crystallization of calcium sulfate dihydrate,finally, a large amount of primary micro calcium sulfate dihydrate crystal nuclei are formed in the solution of the hemihydrate gypsum slurry, the obtained crystal nuclei are smaller in size and strong in induced crystallization effect, so that quick hardening of the hemihydrate building gypsum is achieved; the preparation process is simple, the using method is simple and easy to operate, technical support and theoretical guidance are provided for the hemihydrate gypsum coagulant with low cost and high coagulation promoting effect, and the method has good application prospect.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a hemihydrate building gypsum coagulant and its preparation method and application. Background technique [0002] The newly mined natural gypsum or industrial by-product gypsum, including desulfurization gypsum, phosphogypsum, salt gypsum, etc., is modified by high-temperature calcination, and its main component is hemihydrate gypsum. When water is added, a gypsum slurry is formed, and at the same time, the hemihydrate gypsum combines with water to form a dihydrate again, and as this reaction proceeds, the gypsum slurry gradually loses fluidity and sets and hardens. In order to meet the technical requirements of fast hardening and early strength in the production process of gypsum products, it is of great significance to develop new coagulant accelerators with good coagulation accelerating effect, low cost and convenient construction. [0003] Regarding the setting an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B24/10C04B28/14
CPCC04B28/145C04B40/0039C04B2103/12C04B22/085C04B14/06C04B22/141C04B22/10C04B24/10C04B22/124
Inventor 刘东升陈龙雨周丽新李瑞丰刘洋帆张振向芝菱
Owner YANGTZE NORMAL UNIVERSITY
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