Fluorine gypsum composite cementing material and preparation method thereof

A technology of composite cementitious materials and fluorogypsum, which is applied in the field of fluorogypsum composite cementitious materials and its preparation, can solve problems such as thermodynamically unstable crystallization contact points, pollute the surface, groundwater, waste land resources, etc., and achieve shortening of setting time, Improves hydration rate and prevents pollution

Active Publication Date: 2022-08-05
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, most of the domestic fluorogypsum is only neutralized with lime or calcium carbide slag, and then pumped to the slag yard for storage or landfill, which not only wastes land resources, but also brings huge economic pressure to the enterprise, and also has the effect of being washed by rain and wind. Under the action, the harmful substances remaining in the fluorine gypsum in the storage yard will be transferred, polluting the surface and groundwater, and seriously endangering human health
[0009] Although the anhydrous gypsum content in fluorogypsum is above 90%, its hydration rate is extremely slow, and there are a large number of thermodynamically unstable crystal contact points in the dihydrate gypsum crystals, poor water resistance, and a softening coefficient of about 0.2-0.3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A fluorine gypsum composite cementitious material, by weight percentage, comprising: 68.6% of fluorine gypsum, 18.4% of slag powder, 8.2% of P.042.5 ordinary Portland cement, 2.3% of calcium oxide, 1.1% of potassium sulfoaluminate, ethylene - 0.9% vinyl acetate copolymer rubber powder and 0.5% hydroxypropyl methylcellulose;

[0042] The fluorogypsum is a dry powder obtained by grinding and pulverizing the fluorogypsum discharged from the production of hydrofluoric acid, and the fineness of the fluorogypsum is 200 mesh; the slag powder is blast furnace slag powder, and the slag basicity is 1.32.

[0043] The method for preparing the above-mentioned fluorogypsum composite cementitious material specifically includes: adding fluorogypsum to a Raymond mill, adding slag powder and ordinary Portland cement P.042.5, and uniformly grinding to obtain modified fluorogypsum; Fluorogypsum, calcium oxide, potassium sulfoaluminate, ethylene-vinyl acetate copolymer rubber powder, and hyd...

Embodiment 2

[0045] A fluorine gypsum composite cementitious material, by weight percentage, comprising: 65.4% of fluorine gypsum, 20.7% of slag powder, 7.9% of P.042.5 ordinary Portland cement, 3.0% of calcium hydroxide, 1.0% of potassium sulfate, butylbenzene Rubber powder 1.8% and starch ether 0.2%;

[0046] The fluorogypsum is a dry powder obtained by grinding and pulverizing the fluorogypsum discharged from the production of hydrofluoric acid, and the fineness of the fluorogypsum is 200 meshes.

[0047] The method for preparing the above-mentioned fluorogypsum composite cementitious material specifically includes: adding fluorogypsum to a Raymond mill, adding slag powder and ordinary Portland cement, and uniformly grinding to obtain modified fluorogypsum; adding the modified fluorogypsum and Calcium hydroxide, potassium sulfate, styrene-butadiene rubber powder, and starch ether are added into a stirring device and stirred evenly to obtain the fluorogypsum composite gelling material. ...

Embodiment 3

[0049] A fluorine gypsum composite cementitious material, by weight percentage, comprising: 73.4% of fluorine gypsum, 14.1% of slag powder, 8.8% of P.042.5 ordinary Portland cement, 1.2% of calcium oxide, 1.6% of aluminum sulfate, polyvinyl alcohol Rubber powder 0.2% and hydroxyethyl cellulose 0.7%;

[0050] The fluorogypsum is a dry powder obtained by grinding and pulverizing the fluorogypsum discharged from the production of hydrofluoric acid, and the fineness of the fluorogypsum is 200 mesh; the slag powder is blast furnace slag powder, and the slag basicity is 1.32.

[0051] The method for preparing the above-mentioned fluorogypsum composite cementitious material specifically includes: adding fluorogypsum to a Raymond mill, adding slag powder and ordinary Portland cement, and uniformly grinding to obtain modified fluorogypsum; adding the modified fluorogypsum and Calcium oxide, aluminum sulfate, polyvinyl alcohol powder, and hydroxyethyl cellulose are added to a stirring d...

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Abstract

The invention discloses a fluorgypsum composite cementing material and a preparation method thereof. The fluorgypsum composite cementing material comprises 65-74% of fluorgypsum, 14-21% of slag powder, 5-12% of ordinary Portland cement, 1-3% of an alkaline material, 0.5-1.8% of an active activator, 0.2-2% of redispersible latex powder and 0.1-1% of a water retention thickener. According to the fluorgypsum composite cementing material and the preparation method thereof, provided by the invention, the fluorgypsum is modified by adopting a proper additive under certain process conditions, so that the gelling performance of the fluorgypsum is effectively improved, the mechanical strength of the fluorgypsum is enhanced, and a new way of comprehensive utilization of the fluorgypsum is broadened.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a fluorogypsum composite cementitious material and a preparation method thereof. Background technique [0002] Fluorogypsum is a by-product of the production process of hydrofluoric acid. The industrial waste mainly calcium sulfate is produced by the reaction of sulfuric acid and fluorite powder. For every 1 ton of hydrofluoric acid produced, 3.6 tons of anhydrous fluoride gypsum are produced. The production reaction equation is as follows shown: [0003] H 2 SO 4 +CaF 2 =2HF+CaSO 4 [0004] When the fluorine gypsum is discharged from the reactor, the temperature of the material is 180-230°C, and the temperature of the gas is 800-1000°C. The main component of the discharged gypsum is type II anhydrous calcium sulfate, which is strongly acidic, pH=2-4, and is discharged annually. The amount exceeds 2.5 million tons, so the output of fluorogypsum is con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/142C04B2201/50C04B18/142C04B7/02C04B22/064C04B22/148C04B24/2623C04B24/383C04B22/147C04B24/2676C04B24/38Y02W30/91
Inventor 王存张锐
Owner ANHUI JINYANG FLUORINE CHEM
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