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Method for producing architectural gypsum powder by using phosphogypsum

A technology of building gypsum powder and phosphogypsum, which is applied in the field of building materials, can solve problems affecting the application of phosphogypsum, affecting water resources, and environmental threats, and achieve the effects of avoiding large demand and waste, huge market capacity, and avoiding secondary pollution

Inactive Publication Date: 2006-12-06
宁夏建筑材料研究院(有限公司)
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Problems solved by technology

However, since phosphogypsum contains a certain amount of impurities such as phosphoric acid, organic phosphorus, inorganic phosphorus, and fluorine, the traditional method of preparing gypsum powder, that is, the washing method, can produce qualified gypsum powder, but it will produce a large amount of gypsum powder. Sewage, thus seriously affecting the application of phosphogypsum, and causing serious threats to the environment, and even seriously affecting local water resources

Method used

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Embodiment Construction

[0017] The phosphogypsum waste residue is pre-homogenized in the yard, and then sent to a continuous high-efficiency calcination kiln for calcination according to a certain feeding rate. After leaving the kiln, it is aged for 7-15 days under natural conditions and then ground into 100-200 mesh powder. The calcining kiln temperature is controlled at 130-300°C.

[0018] The gypsum powder obtained above can be made into plastering gypsum, gypsum putty or bonded gypsum by adding some admixtures, and can also be directly packaged and applied as gypsum blocks or gypsum boards.

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Abstract

This invention relates to a method for producing construction gypsum powder from ardealite. The method comprises: (1) prehomogenizing ardealite waste residue, placing in a continuous high-efficiency calcining kiln, and calcining; (2) taking out and aging naturally for 7-15 d; (3) milling into 100-200 mesh powder. This invention uses a unique calcination technique to produce high performance construction gypsum from ardealite waste residue, and has such advantages as no secondary pollution and saved water resource.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a method for producing building gypsum powder from phosphogypsum. Background technique [0002] Phosphogypsum is a waste residue produced during the production of phosphate fertilizers such as phosphoric acid and phosphoamido. In recent years, with the rapid development of high-concentration compound fertilizers and feed additives in China, the annual discharge of phosphogypsum is very large, about 30 million tons, which not only brings great pressure to the stacking of production enterprises, but also pollutes the environment. [0003] At present, the treatment and utilization of phosphogypsum is mainly to process it into a substitute for natural gypsum. However, since phosphogypsum contains a certain amount of impurities such as phosphoric acid, organic phosphorus, inorganic phosphorus, and fluorine, the traditional method of preparing gypsum powder, that is, the wa...

Claims

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Application Information

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IPC IPC(8): C04B11/26
CPCC04B11/262
Inventor 段庆奎王立明王惠琴董文亮周军璞于棣春
Owner 宁夏建筑材料研究院(有限公司)
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