Preparation method of modified fluorgypsum powder

A technology of gypsum powder and fluorine gypsum, which is applied in the field of preparation of modified fluorine gypsum powder, can solve problems such as difficult to handle, occupy factory land, and affect the environment, and achieve the effects of fewer procedures, low cost, and reduced pungent odor

Inactive Publication Date: 2016-04-06
UNIV OF JINAN
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  • Abstract
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AI Technical Summary

Problems solved by technology

Chemical companies that produce propylene oxide produce nearly one million tons of saponification slag every year. These wastes are piled up like mountains, which not only occupy the factory land, are difficult to handle, but also have an impact on the environment.

Method used

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Embodiment Construction

[0020] 1. Implementation case

[0021] A kind of preparation method of modified fluorine gypsum powder:

[0022] (1) Fluorogypsum waste slag after hydrofluoric acid production, after the fluorine gypsum waste slag is output, enter the horizontal cooling converter, and add 6% saponification slag to the horizontal cooling converter at the same time, mix for 8 minutes, and then add 0.5% quicklime powder, Adjust the pH to 7~8 and mix well;

[0023] (2) Put the above-mentioned uniformly mixed powder into a ball mill according to the ratio of powder: alum: fly ash = 1:1:0.2, and ball mill to 200~250 mesh to obtain modified fluorine gypsum powder.

[0024] The fluorine gypsum waste residue after hydrofluoric acid production is produced by Zibo Feiyuan Chemical Co., Ltd.;

[0025] The saponification slag used is produced by Shandong Haili Chemical Co., Ltd.;

[0026] The prepared modified fluorine gypsum powder, according to the water-cement ratio = 1:0.39, the prepared modified fl...

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Abstract

The invention discloses a preparation method of modified fluorgypsum powder. Fluorgypsum waste residues after production of hydrofluoric acid are cooled through a horizontal cooling converter, saponification slag and quicklime are added, the mixture is uniformly mixed, the mixture, alums and fly ash are jointly subjected to ball milling, and the modified fluorgypsum powder is prepared. According to the preparation method of the modified fluorgypsum powder, the preparation process is simple, a few procedures are adopted, generation of pungent smell is effectively reduced in the preparation process, the cost is low, and the prepared modified fluorgypsum powder is wide in application range.

Description

technical field [0001] The invention relates to the field of comprehensive resource utilization and environmental protection of industrial solid waste, in particular to a preparation method of modified fluorogypsum powder. Background technique [0002] Fluorite powder (CaF 2 ) and concentrated sulfuric acid (H 2 SO 4 ) in a certain proportion (mass ratio 1:1.3), heated in a rotary furnace (250°C~280°C), and undergoes a chemical reaction (H 2 SO 4 +CaF 2 =2HF+CaSO 4 ) to produce hydrogen fluoride (HF) and calcium sulfate (CaSO 4 ), hydrogen fluoride gas is condensed and collected to produce hydrofluoric acid, and the solid product of the reaction, calcium sulfate, is gypsum, because it contains a small amount of unreacted CaF 2 , So it is also called "fluorine gypsum". A certain amount of H is often mixed in the residue 2 SO 4 , HF and CaF 2 , they are still reacting slowly, so the fluorine gypsum is acidic. Hydrofluoric acid has a strong pungent smell, so the tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/142C04B2201/50
Inventor 张国辉刘泉温海滨
Owner UNIV OF JINAN
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