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Novel utilization method of phosphogypsum

A new type of technology for phosphogypsum, applied in coatings, layered products, construction, etc., can solve the problems of phosphogypsum occupying land resources, pollution, etc., achieve the effects of wide application range, avoiding environmental problems, and reducing the proportion of use

Inactive Publication Date: 2016-04-27
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 new utilization method of phosphogypsum, which fundamentally solves the problems of phosphogypsum occupying land resources and serious pollution

Method used

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Embodiment Construction

[0033] 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.

[0034] The novel utilization method of phosphogypsum of the present invention is as follows:

[0035]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 present invention provides a novel utilization method of phosphogypsum. The novel utilization method comprises: S1, drying phosphogypsum for 5-25 min at a temperature of 150-180 DEG C, and directly calcining phosphogypsum for 1-2 min at a temperature of 500-600 DEG C to form modified phosphogypsum; S2, cooling the modified phosphogypsum; S3, removing toxic impurities from the modified phosphogypsum; and S4, carrying out mixing treatment on the modified phosphogypsum and polyethylene to form the film layer. The method further comprises coating a coating layer on one side or both sides of the film layer to form the phosphogypsum film, wherein the phosphogypsum film can be further prepared into wallpaper, environmental protection paper, packaging materials, composite films, phosphogypsum composite profiles, and the like, and has broad application, and the problems of soil resource occupation and serious pollution of the phosphogypsum can be fundamentally solved.

Description

【Technical field】 [0001] The invention relates to the field of chemical industry, in particular to a novel 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K3/30C04B28/14C04B41/50E04F13/077C09D167/04C09D7/12B32B33/00C04B24/26
Inventor 杨刚
Owner 杨刚
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