Comprehensive utilization method of phosphogypsum

A technology for phosphogypsum and gypsum agglomerates, applied in the field of phosphogypsum, can solve the problems of high production cost of sulfuric acid, excess calcium oxide, insufficient acid content, etc., and achieve the effect of low-cost comprehensive utilization

Inactive Publication Date: 2021-02-12
荆州三迪建筑科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] Phosphogypsum is a by-product of phosphorus chemical enterprises. Since it cannot be directly reused, it causes secondary pollution and becomes a difficult problem for phosphorus chemical enterprises to solve. Since the content of phosphogypsum is calcium sulfate, in addition to the existing reprocessing of phosphogypsum Calcination, the main component of phosphogypsum, dihydrate gypsum, is converted into hemihydrate gypsum, and the harmful impurities inside the phosphogypsum are removed and used as building gypsum. The composition and ratio of the sulfate ion in the phosphogypsum are similar, so people use phosphogypsum to calcine to produce sulfuric acid, and use the calcium oxide left over from calcination to produce cement; The cement made of calcium oxide produced by gypsum calcination is inactive and can only be used in small-scale application scenarios such as plugging, resulting in excess calcined calcium oxide; A large amount of air is blown in the calcination chamber to dilute the sulfur dioxide flue gas after calcination, so that the sulfur dioxide content in the flue gas collected during calcination is lower than 9%. In this way, the acid content of the collected flue gas is not enough, and the flue gas needs to be further concentrated. The production cost of sulfuric acid is too high

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  • Comprehensive utilization method of phosphogypsum

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Embodiment Construction

[0009] In order to better illustrate the technical solution of the present invention, the specific implementation manner of the present invention is further described in conjunction with the accompanying drawings, as figure 1 According to step 1, phosphogypsum is mixed with 10% bauxite powder and 5% coal powder, and stirred evenly. The coal powder is selected from high-sulfur coal powder, which is conducive to the maintenance of acid concentration in the flue gas. At the same time, adding an application field to high-sulfur coal, 1% sawdust or rice husk is easier to ignite; in order to further increase the acid concentration of flue gas, 0.5% sulfur is added in this example; the above materials are crushed and used with phosphogypsum The general powder stirring and mixing device in this industry is used as the phosphogypsum stirring and mixing device 1 of this example to stir evenly; according to step 2, the double-roller ball press machine commonly used in this industry is sel...

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Abstract

The invention discloses a comprehensive utilization method of phosphogypsum and belongs to the field of phosphogypsum utilization. The method comprises the following steps: 1, doping bauxite powder and coal powder into phosphogypsum, and uniformly stirring, 2, processing the stirred mixture into balls, 3, putting the agglomerated ardealite into a calcining device, 4, feeding the calcining device into a tunnel kiln, 5, electrifying and igniting the calcining furnace, 6, collecting flue gas generated in calcination and feeding into sulfuric acid preparation equipment for sulfuric acid preparation, and 7, applying the calcined spheres as ceramsite. The method has the characteristic that the ardealite can be efficiently and comprehensively utilized to produce sulfuric acid and ceramsite.

Description

technical field [0001] The invention belongs to the field of phosphogypsum, in particular to an efficient comprehensive utilization method of phosphogypsum. Background technique [0002] Phosphogypsum is a by-product of phosphorus chemical enterprises. Since it cannot be directly reused, it causes secondary pollution and becomes a difficult problem for phosphorus chemical enterprises to solve. Since the content of phosphogypsum is calcium sulfate, in addition to the existing reprocessing of phosphogypsum Calcination, the main component of phosphogypsum, dihydrate gypsum, is converted into hemihydrate gypsum, and the harmful impurities inside the phosphogypsum are removed and used as building gypsum. The composition and ratio of the sulfate ion in the phosphogypsum are similar, so people use phosphogypsum to calcine to produce sulfuric acid, and use the calcium oxide left over from calcination to produce cement; The cement made of calcium oxide produced by gypsum calcination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/024C04B11/02C01B17/74C04B33/132C04B38/00
CPCC01B17/74C04B11/02C04B11/024C04B33/132C04B38/009Y02P40/60
Inventor 赵嘉珩赵建纲
Owner 荆州三迪建筑科技有限公司
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