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Waste fluorine gypsum activating technique

A fluorogypsum and modification technology, which is applied in the field of solid waste resource treatment, can solve the problems of unsatisfactory properties of modified fluorogypsum, high cost of modification of fluorogypsum, narrow application fields, etc., to achieve non-toxic and harmless products, The effect of reasonable raw material composition and simple method

Inactive Publication Date: 2011-04-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings, and develop a new fluorogypsum modification technology that uses waste to treat waste, so as to solve the application caused by high cost of fluorogypsum modification, low utilization rate and performance of modified fluorogypsum that cannot meet relevant requirements. narrow technical issues

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  • Waste fluorine gypsum activating technique
  • Waste fluorine gypsum activating technique
  • Waste fluorine gypsum activating technique

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Embodiment Construction

[0029] Below in conjunction with the accompanying drawings, the implementation of the novel fluorogypsum modification technology will be further described.

[0030] In the following examples, it is the mass percentage. When testing the physical properties of the hardened body of fluorine gypsum after hydration, the test pieces are all 4×4×4 test molds, and the relevant properties are carried out according to the "Building Gypsum" standard.

[0031] The fluorine gypsum from the storage yard was selected, and tested by a pH meter, the pH = 8.89, showing alkaline. Wash the acidic waste slag with hot water, recover the washing liquid, carry out cooling, filtration and heat treatment, and obtain the self-made acidic modified liquid after cooling under natural conditions, with a pH value in the range of 3 to 4, and contains soluble substances such as K and Al. Inorganic salt. Modifier preparation process see figure 1 shown. Fluorogypsum was neutralized with self-made acidic modif...

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Abstract

The invention relates to a recycling and modifying method of chemical industry by product fluorine gypsum, belonging to the field of solid waste recycling. The method comprises the following steps of: (1) preparing a modifying solution, namely washing acidic waste residue with hot water, recycling washing fluid, cooling, filtering, heating and cooling under natural conditions to obtain a self-made acidic modifying solution; (2) processing raw materials, namely adding the acidic modifying solution for neutralization and maintaining the fluorine gypsum to be mildly acidic; (3) selecting a modifying agent, namely selecting a water-retaining agent, grinding additive and a crystal seed as required; and (4) mixing and stirring the fluorine gypsum with the modifying agent under certain conditions. The invention has the advantages that the modifying solution is self-made, thus treating waste by waste and reducing modification cost; the quality of the product obtained by adopting the method is higher than that of products obtained by adopting other methods, and adding amount of the fluorine gypsum when being taken as cement retarder is improved to 6% from 3%, thus reducing cost of cement; and the modified fluorine gypsum and coal ash can be comprehensively applied to cement concrete and road repairing industries.

Description

technical field [0001] The invention belongs to the field of solid waste resource treatment, and in particular relates to a chemical industry by-product fluorogypsum resource modification treatment method. The modified fluorogypsum and thermal power plant fly ash are comprehensively applied to cement retarder and road repair industry middle. Background technique [0002] The comprehensive utilization of waste fluorogypsum as a resource in industrial production has been used for a long time in Europe and the United States, and resource utilization has been realized. my country is still in its infancy in the comprehensive utilization of waste fluorine gypsum. Fluorogypsum is the industrial waste slag discharged during the production of hydrofluoric acid by sulfuric acid method. The main component of fluorogypsum is anhydrous calcium sulfate. Generally, its CaSO 4 The content reaches more than 90%. However, fluorogypsum (CaSO 4 ) belongs to anhydrous type II gypsum, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
CPCC04B22/146C04B28/02Y02W30/91C04B18/08C04B40/0028C04B2103/22
Inventor 杨道武姚艳刘义任卓徐祥李海如肖忠良张雄飞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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