Gypsum powder product process adopting sequential aging and grinding

A gypsum powder and product technology, applied in cement production and other directions, can solve problems such as poor performance of phosphogypsum, agglomeration of insoluble substances, resource shortage, etc., to improve hydration coagulation and mechanical properties, save water resources, and save operation steps. Effect

Inactive Publication Date: 2019-07-05
四川蓝鼎新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcination method cannot completely remove the harmful substances in the phosphogypsum, and the phosphogypsum needs to be heated at a high temperature during the calcination process, which not only increases the cost of combustion, but also causes the phosphogypsum The problem that harmful substances cannot be completely removed
However, the phosphogypsum treated by the lime neutralization method has poor performance, and there is also a small amount of soluble phosphorus and fluorine that are not removed, and the production of insoluble matter is agglomerated on the surface of the hemihydrate gypsum crystal. Moreover, the usage of lime is very large. prone to resource shortages

Method used

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  • Gypsum powder product process adopting sequential aging and grinding
  • Gypsum powder product process adopting sequential aging and grinding
  • Gypsum powder product process adopting sequential aging and grinding

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Experimental program
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Embodiment 1

[0040] 1. The chemical composition of the phosphogypsum used in the present embodiment is shown in the following table 1,

[0041] Table 1 Chemical composition of phosphogypsum

[0042] components Ca0 SO 3

SiO 2

Al 2 o 3

MgO P 2 o 5

F organic matter h 2 o

Mass fraction / % 28.34 40.85 8.12 0.61 0.15 0.81 0.35 0.17 19.15

[0043] According to the above step (1), the phosphogypsum was calcined. Under the condition that the calcination temperature was 2 hours, the influence of different calcination temperatures on the phase of phosphogypsum was investigated. The results are shown in Table 2 below. The results show that: when the calcination temperature is greater than 170°C, the plaster (CaSO 4 1 / 2H 2 The content of O) is more than 70%, and the content of phosphogypsum is less than 9%; as the temperature increases, the content of phosphogypsum gradually decreases to 0, and the content of plaster gradually increa...

Embodiment 2

[0068] refer to Figure 1-Figure 2 , the present invention also discloses an aging device, comprising: an aging box 1, a stirring assembly vertically arranged in the aging box 1; The transmission cylinder 3, the transmission cylinder 3 is fixed with the top of the aging tank 1 through the bearing 4. Specifically, the outer wall of the stirring shaft 2 is provided with threads, and the inner wall of the transmission cylinder 3 is also provided with threads. The agitation shaft 2 and the transmission cylinder 3 are driven by the threads, and the rotation of the transmission cylinder 3 makes the agitation shaft 2 move up and down in the aging tank 1 . The transmission cylinder 3 is fixed in the inner ring of the bearing 4, and the outer ring of the bearing 4 is fixed on the top of the aging box 1, so that the transmission cylinder 3 can rotate.

[0069] The top of the transmission cylinder 3 is fixed with a rotating gear 5, the stirring shaft 2 passes through the rotating gear 5...

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Abstract

The invention relates to the technical field of gypsum preparation, in particular to a gypsum powder product process adopting sequential aging and grinding. According to the specific scheme, the gypsum powder product process adopting sequential aging and grinding includes the following steps that firstly, after broken ardealite, steel slag and coal ash are mixed, the mixture is washed and aged; then a reinforcing agent, a water reducer and a sulfate solution are added, and a gypsum mixture is obtained; a retarder, borax and composite fibers are added into the gypsum mixture, and mixed liquor of carbon fibers and resin is added to the gypsum mixture; finally, drying and grinding are carried out, and gypsum powder is obtained. The gypsum powder is prepared through sequential aging and grinding, harmful impurities in gypsum can be completely removed in the aging process, and the prepared gypsum powder has excellent mechanical performance. The whole preparation process is easy to operate and free of contamination, and the setting time of the gypsum powder can be well controlled.

Description

technical field [0001] The invention relates to the technical field of gypsum preparation, in particular to a gypsum powder product process that is first aged and then ground. Background technique [0002] Phosphogypsum is an industrial by-product produced in the wet-process phosphoric acid production process, the main component is CaSO 4 2H 2 O, with a mass fraction greater than 80%, is often regarded as a kind of industrial waste. In addition to calcium sulfate dihydrate, phosphogypsum also contains phosphorus, fluorine, alkali metals, organic matter and other impurities. In the process of preparing gypsum powder, if the impurities in phosphogypsum are not removed, the prepared gypsum powder will have problems such as too long setting time and too low strength, which seriously restrict the application of phosphogypsum. Therefore, in order to prepare gypsum powder for construction with phosphogypsum, the impurities in the phosphogypsum must be removed. [0003] In the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B7/26C04B7/21
CPCC04B7/21C04B7/26C04B11/26Y02P40/10
Inventor 李自树黄明忠贾理蘖王森林
Owner 四川蓝鼎新材料有限公司
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