A kind of utilization method of phosphogypsum

A phosphogypsum and film technology, applied in coatings, layered products, buildings, etc., can solve the problems of land resources and pollution of phosphogypsum, and achieve the effect of wide range of use, avoid environmental problems, and reduce the proportion of use

Inactive Publication Date: 2018-03-30
杨刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to overcome the current problems of phosphogypsum occupying land resources, serious pollution and low utilization rate, the present invention provides a method for utilizing phosphogypsum, which fundamentally solves the problems of phosphogypsum occupying land resources and serious pollution

Method used

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Embodiment Construction

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] The novel utilization method of phosphogypsum of the present invention is as follows:

[0033]Step S1. Drying and calcining phosphogypsum: transport the industrial waste phosphogypsum to a high-temperature stove, and dry and dehydrate the phosphogypsum at 150-180°C through the high-temperature stove for 5-25 minutes. The dried phosphogypsum is sent to the calcination furnace for high-temperature calcination at a temperature of 500-600°C. In the calcination furnace, the phosphogypsum is directly calcined by the flame for 1-2 minutes. In order to avoid that the flame cannot directly burn all the phospho...

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Abstract

The invention provides a method for utilizing phosphogypsum, the method comprising steps: S1: drying the phosphogypsum at 150-180°C for 5-25 minutes, and then directly calcining the phosphogypsum at 500-600°C for 1-2 Minutes later, modified phosphogypsum is formed; S2: cooling the modified phosphogypsum; S3: removing toxic impurities in the modified phosphogypsum; and S4: mixing the modified phosphogypsum with polyethylene to form a film layer, and the modified phosphogypsum The ratio of polyethylene is 85:15. The method further includes coating a coating layer on one side or both sides of the film layer to form a phosphogypsum film, and the phosphogypsum film can be further made into wallpaper, environmentally friendly paper, packaging materials, composite films and phosphogypsum composite profiles, etc., which utilize It can fundamentally solve the problem of phosphogypsum occupying land resources and causing serious pollution.

Description

【Technical field】 [0001] The invention relates to the field of chemical industry, in particular to a utilization method of phosphogypsum. 【Background technique】 [0002] Phosphogypsum (referred to as PG) is an industrial waste discharged from the phosphoric acid or phosphate fertilizer industry and some synthetic detergent industries. As a large agricultural production country, my country's phosphate fertilizer industry has developed very rapidly in recent years. In 2006, relevant data showed that my country had become the world's largest producer of phosphate fertilizer. With the rapid development of the phosphate fertilizer industry, the amount of waste phosphogypsum that is discharged from the production of phosphate fertilizers is quite astonishing. It can be seen that phosphogypsum has piled up into mountains. As early as the end of 2011, my country has accumulated more than 300 million tons of phosphogypsum, which is equivalent to more than 200 kilograms of waste resid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K3/30C04B28/14C04B41/50E04F13/077C09D167/04C09D7/61B32B33/00C04B24/26
Inventor 杨刚
Owner 杨刚
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