Phosphogypsum calcium sulfate paper preparation method

The technology of phosphogypsum and calcium sulfate is applied in the field of preparation of phosphogypsum calcium sulfate paper, which can solve the problems of poor paper quality, complicated process, high cost, etc., and achieve the effects of low cost, simple process, and avoiding tree felling and environmental damage and pollution.

Inactive Publication Date: 2015-09-16
王安全
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Problems solved by technology

[0008] The patent of my country's application number 201210355022.0 once disclosed a stone paper and its preparation method, which uses calcium carbonate as the main raw material, and mainly uses the traditional calendering process to make paper, and the traditional calendering method is based on the characteristics of the calcium carbonate raw material However, the design is not suitable for the use of calcium sulfate raw materials. At the same time, the patented method has the defects of complicated process, high cost and poor paper quality.

Method used

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Embodiment Construction

[0026] The present invention will be further described below in combination with specific embodiments.

[0027] During specific implementation, the preparation method of this phosphogypsum calcium sulfate paper adopts the following raw materials: 70-75 parts by mass of anhydrous phosphogypsum, 20-25 parts by mass of polyethylene and / or polypropylene, adhesive 3- 5 parts by mass; prepared by mixing, banburying, casting and calendering. The binder specifically refers to 1-2 parts by mass of polyimide, 0.7-1 part by mass of PS / PMMA modifier, 1-1.5 parts by mass of MF dispersant, and 0.3-0.5 parts by mass of bromine+antimony flame retardant.

[0028] This method specifically comprises the following steps:

[0029] a. Calcining phosphogypsum at high temperature to remove impurities and crystal water to obtain anhydrous phosphogypsum, then finely grind it into powder and pass through a 2000-3000 mesh sieve; during the calcination process, a drum with a lifting plate on the inner wa...

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Abstract

The present invention discloses a phosphogypsum calcium sulfate paper preparation method, which is characterized in that the following raw materials such as 70-75 parts by mass of anhydrous phosphogypsum, 20-25 parts by mass of polyethylene and/or polypropylene, and 3-5 parts by mass of a cementing agent are used, and are subjected to mixing, banburying, casting and calendaring to prepare the phosphogypsum calcium sulfate paper. With the phosphogypsum calcium sulfate paper preparation method of the present invention, the scale production can be performed so as to achieve the batch treatment on the industrial by-production waste phosphogypsum; the tree hewing and the environment damage pollution caused by the ordinary paper making method can be avoided; and the method further has characteristics of simple process, low cost, and excellent paper quality.

Description

technical field [0001] The invention relates to the field of reuse of industrial waste product phosphogypsum, in particular to a preparation method of phosphogypsum calcium sulfate paper. [0002] Background technique [0003] Industrial by-product gypsum refers to the by-product or waste residue mainly composed of calcium sulfate generated by chemical reaction in industrial production, also known as chemical gypsum or industrial waste gypsum. It mainly includes desulfurization gypsum, phosphogypsum, citrate gypsum, fluorine gypsum, salt gypsum, monosodium glutamate gypsum, copper gypsum, titanium gypsum, etc. Among them, the production of desulfurization gypsum and phosphogypsum accounts for about 85% of the total industrial by-product gypsum. [0004] In 2009, my country's industrial by-product gypsum produced about 118 million tons, and the comprehensive utilization rate was only 38%. Among them, phosphogypsum is about 50 million tons, and the comprehensive utilization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B24/26
Inventor 王安全
Owner 王安全
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