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Comprehensive processing method for ardealite washing technology

A comprehensive treatment and phosphogypsum technology, applied in the comprehensive treatment of phosphogypsum water washing technology, and the comprehensive treatment of phosphogypsum, can solve the problems of prolonging the setting time of hemihydrate gypsum, reducing the structure and quality of gypsum, reducing the strength, etc. Batch processing, favorable for promotion, low cost effect

Inactive Publication Date: 2014-11-19
湖北胜垒石膏技术有限公司 +1
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Problems solved by technology

Among them, soluble phosphorus prolongs the setting time and reduces the strength of hemihydrate gypsum, soluble fluorine makes the strength of calcium sulfate dihydrate crystals dispersed unevenly, and the bonding force between crystals is weakened. Decrease in structure and quality of gypsum

Method used

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  • Comprehensive processing method for ardealite washing technology

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specific Embodiment approach 2

[0045] Attached below figure 1And embodiment the present invention is described in further detail. A composite washing method of the present invention that effectively utilizes organic impurities and soluble phosphorus and fluorine impurities in phosphogypsum, uses the organic floating matter obtained in the washing process to wash and filter calcium phosphate and calcium fluoride produced after alkali reaction in the filtered water It plays a flocculation function, makes the sediment float, removes phosphorus and fluorine substances in the washing water, and realizes the recycling of the washing water.

[0046] Specific steps:

[0047] (1) According to the mass ratio of gypsum and water as 1:3, weigh 100kg of phosphogypsum, add 300kg of water to soak and stir for 15min;

[0048] (2) After standing for 5 minutes, collect the floating organic matter A on the liquid surface, and collect the washing liquid (about 297kg);

[0049] (3) Add A to the washing solution, add 80g of q...

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Abstract

The invention relates to a comprehensive processing method for an ardealite washing technology. The method comprises the following steps: waster is added to ardealite of phosphoric acid by-products by a wet method, the ardealite and the water are mixed and placed still, lower-layer gypsum, upper-layer washing liquid and floaters A floating on filtrate are obtained, and the floaters A and the upper-layer washing liquid are respectively collected; the floaters A and quick lime are added into the upper-layer washing liquid, the floaters A, the quick lime and the upper-layer washing liquid are stirred and placed still, flocculent floaters B are obtained, and the floaters B and lower-layer aqueous solutions are respectively collected; after acid solutions are added into the lower-layer aqueous solutions for adjusting a pH value, the lower-layer aqueous solutions are used for circularly washing the ardealite. The ardealite which is processed can be used as excellent structural materials and auxiliary materials, and impurities in ardealite raw materials are translated into secondary resources, so that the effect of turning waste into wealth is realized.

Description

technical field [0001] The invention relates to a comprehensive treatment method of phosphogypsum, in particular to a comprehensive treatment method of phosphogypsum washing technology, which belongs to the field of resource utilization of phosphogypsum. Background technique [0002] Phosphogypsum is the main by-product of wet-process phosphoric acid production, and its main component is calcium sulfate dihydrate (CaSO 4 2H 2 O); in addition, there are a small amount of phosphate rock, phosphoric acid, calcium fluoride, sodium fluoride, oxides of metals such as Si, Mg, Al, Fe, and trace amounts of radioactive elements. At present, the annual production of phosphoric acid in my country (according to P 2 o 5 Total) is about 5 million tons / year, which will lead to the production of about 25 million tons of phosphogypsum. Due to the limitation of technical level, the actual utilization rate of phosphogypsum in my country is only about 10%, and a large amount of phosphogypsum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 张向宇
Owner 湖北胜垒石膏技术有限公司
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