Phosphogypsum ball and preparation method and application thereof

A technology of gypsum balls and phosphogypsum, which is applied in the field of utilization of phosphogypsum, a solid waste of phosphorus chemical industry, can solve the problems of affecting the quality of cement, difficult to popularize and apply, and low strength, and achieve good economic and social benefits, reduce costs, and facilitate transport effect

Inactive Publication Date: 2015-07-15
SICHUAN UNIV
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Problems solved by technology

[0005] At present, some technologies use phosphogypsum as the main raw material to produce cement retarders. The auxiliary materials are complicated. The finished products have high water content, some as high as 15%, and two, low strength, which will increase the cost in cement production. And affect the quality of cement, it is difficult to popularize and apply

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  • Phosphogypsum ball and preparation method and application thereof

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[0021] The present invention also provides a preparation method for the above-mentioned phosphogypsum balls, specifically: mixing various raw materials in any order, then granulating and aging to obtain phosphogypsum balls, and the raw materials are calculated in parts by weight: phosphogypsum spheres 82-95 parts, 3-10 parts of alkaline additives, 2-8 parts of gelling agent; wherein, the phosphorus-containing gypsum is a mixture of dihydrate gypsum and hemihydrate gypsum, and the weight ratio of dihydrate gypsum and hemihydrate gypsum is: 85-95: 5-15.

[0022] Preferably, the preparation method of the above-mentioned phosphogypsum balls is as follows: the phosphogypsum is firstly mixed with the basic additive, then the gelling agent is added, and then granulated and aged to obtain the phosphogypsum balls.

[0023] Preferably, in the above-mentioned preparation method of phosphogypsum balls, aging is performed for 10-30 days.

[0024] Preferably, the above-mentioned preparatio...

Embodiment 1

[0031] Take 85 parts of dihydrate gypsum, 8 parts of hemihydrate gypsum, 5 parts of lime, and 2 parts of bentonite. After the ingredients are mixed and stirred thoroughly, they are sent to a disc granulator. The disc speed is 13 rpm and the motor power is 11kw. Form into balls under certain conditions, store and age naturally for 15 days, and finally obtain modified phosphogypsum balls. The moisture content of the obtained phosphogypsum balls is 8wt%, and the soluble P 2 o 5 Content 0.05wt%, pH value 8.0, SO 3 : 41.55%, particle strength 52N, particle size 10mm.

Embodiment 2

[0033] Take 86 parts of dihydrate gypsum, 8 parts of hemihydrate gypsum, 3 parts of lime, and 3 parts of bentonite. After the ingredients are fully mixed and stirred, they are sent to a disc granulator. The disc speed is 13 rpm and the motor power is 12kw. Form into balls under certain conditions, store and age naturally for 17 days, and finally obtain modified phosphogypsum balls. The obtained phosphogypsum balls had a moisture content of 7.8wt%, soluble P 2 o 5 Content 0.04wt%, pH value 8.2, SO 3 : 42.15%, particle strength 53N, particle size 12mm.

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Abstract

The invention relates to the utilization technology of solid waste phosphogypsum in phosphorus chemical industry, in particular to a phosphogypsum ball and a preparation method and an application thereof. The phosphogypsum ball provided by the invention is composed of the following raw materials in parts by weight: 82-95 parts of phosphorous gypsum, 3-10 parts of alkaline additives and 2-8 parts of gelling agent, wherein the phosphorous gypsum is a mixture of dihydrate gypsum and semi-hydrated gypsum, and the weight ratio of the dihydrate gypsum to the semi-hydrated gypsum is (85-95): (5-15). The water content of the phosphogypsum ball prepared by the preparation method is less than 10wt%, the SO3 content is more than 40wt%, the pH is larger than 7, the P2O5 content is less than 0.1wt%, the compressive strength of particles is more than 50 N, the particle diameters and the particles of the phosphogypsum ball are uniform, the strength is moderate, and the phosphogypsum ball is convenient to transport and can replace natural dihydrate gypsum oranhydrite to serve as a retarder in cement production.

Description

technical field [0001] The invention relates to the utilization technology of phosphogypsum, which is a solid waste of phosphorus chemical industry, and specifically provides a phosphogypsum ball, a preparation method and application thereof. Background technique [0002] Phosphogypsum is a kind of industrial waste discharged from the production of wet-process phosphoric acid by phosphorus chemical enterprises. It is a type of chemical gypsum with the largest emission in my country at present. The utilization rate is very low, especially in the southwest region. Stacked, and the soluble phosphorus, fluorine and other substances contained in it will pollute groundwater resources and endanger the living environment of human beings. [0003] The main components of phosphogypsum are the same as natural dihydrate gypsum. How to apply phosphogypsum as a substitute for natural gypsum in the production process of cement has always attracted attention. In cement production, natural g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14
Inventor 王辛龙史文慧张志业杨林孔行健杨秀山
Owner SICHUAN UNIV
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