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
CN114853433AActive Publication Date: 2022-08-05ANHUI JINYANG FLUORINE CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI JINYANG FLUORINE CHEM
Publication Date
2022-08-05
Patent Text Reader

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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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