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Combined pretreatment method of ardealite

A phosphogypsum and pretreatment technology, applied in chemical instruments and methods, calcium/strontium/barium compounds, inorganic chemistry, etc., can solve problems such as inability to effectively eliminate eutectic phosphorus and low removal rate of water-soluble impurities

Inactive Publication Date: 2017-10-13
嘉兴市南湖区翊轩塑料五金厂(普通合伙)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide a compound pretreatment method for phosphogypsum, aiming at the defects of low removal rate of water-soluble impurities and inability to effectively eliminate eutectic phosphorus in the current traditional phosphogypsum pretreatment method

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  • Combined pretreatment method of ardealite

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example 1

[0023] First, put the phosphogypsum into a ball mill to grind and pulverize for 2 hours to obtain phosphogypsum powder, pass the obtained phosphogypsum powder through sieves of 60 mesh, 100 mesh, 200 mesh, 270 mesh and 325 mesh in turn to remove the on-screen material and obtain the sieved phosphorous gypsum powder. For gypsum, fresh lemons were weighed and put into a pulverizer to pulverize for 40 minutes to obtain a pulverized product. The pulverized product and distiller's grains were mixed in a mass ratio of 10:1 and then put into a fermenter, sealed and fermented at 55°C for 20 days. After fermentation, filter and separate to obtain the fermentation filtrate; mix the above fermentation filtrate and sieved phosphogypsum at a mass ratio of 2:1 and stack them in a greenhouse with a temperature of 50°C and a relative air humidity of 70% for natural standing reaction 9 days, after the reaction is finished, a pretreated phosphogypsum is obtained; the primary pretreated phosphogy...

example 2

[0025]First, put the phosphogypsum into a ball mill to grind and pulverize for 2 hours to obtain phosphogypsum powder, pass the obtained phosphogypsum powder through sieves of 60 mesh, 100 mesh, 200 mesh, 270 mesh and 325 mesh in turn to remove the on-screen material and obtain the sieved phosphorous gypsum powder. For gypsum, fresh lemons were weighed and put into a pulverizer to pulverize for 40 minutes to obtain a pulverized product. The pulverized product and distiller's grains were mixed in a mass ratio of 10:1 and then put into a fermenter, sealed and fermented at 55°C for 20 days. After the fermentation, the fermentation filtrate was obtained by filtration and separation; the above fermentation filtrate and sieved phosphogypsum were mixed in a mass ratio of 2:1 and stacked in a greenhouse with a temperature of 40°C and a relative air humidity of 70% for natural standing reaction 9 days, after the reaction is finished, a pretreated phosphogypsum is obtained; the primary p...

example 3

[0027] First, put phosphogypsum into a ball mill and grind for 1 hour to obtain phosphogypsum powder, pass the obtained phosphogypsum powder through sieves of 60 mesh, 100 mesh, 200 mesh, 270 mesh and 325 mesh in turn to remove the on-screen material and obtain sieved phosphorus For gypsum, fresh lemons were weighed and put into a pulverizer to pulverize for 35 minutes to obtain a pulverized product. The pulverized product and distiller's grains were mixed at a mass ratio of 10:1 and then put into a fermenter, sealed and fermented at 40°C for 17 days. After the fermentation, the fermentation filtrate was obtained by filtration and separation; the above fermentation filtrate and sieved phosphogypsum were mixed in a mass ratio of 2:1 and stacked in a greenhouse with a temperature of 45°C and a relative air humidity of 65% for natural standing reaction 8 days, after the reaction is finished, a pretreated phosphogypsum is obtained; the primary pretreated phosphogypsum is packed int...

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Abstract

The invention relates to a combined pretreatment method of ardealite, belonging to the technical field of renewable resources and environment. The method comprises the following steps of removing harmful substances in the ardealite by grinding and screening firstly, then smashing and fermenting lemon to obtain fermented filtrate rich in citric acid and microorganisms, mixing and piling by using the fermented filtrate and the ardealite, converting phosphorus and fluorine into water-soluble citrate, ferrite and chlorate by utilizing the citric acid in the fermented filtrate, degrading and removing organic pollutants in the ardealite by utilizing the microorganisms, then using water as a stream-pressure medium, improving the removal rate of water-soluble impurities, then frying and heating continuously under a high-temperature condition to enable co-crystallized phosphorus in the ardealite to be separated out and then converted into insoluble and inert calcium pyrophosphate so as to be decomposed and removed at high temperature, and finally, further removing residual soluble impurities and organic matters by flotation. By the method disclosed by the invention, the content of the soluble impurities and co-crystallized phosphorus in the ardealite is greatly reduced, and the purity of the ardealite is improved.

Description

technical field [0001] The invention relates to a composite pretreatment method of phosphogypsum, which belongs to the technical field of renewable resources and environment. Background technique [0002] Phosphogypsum is the solid waste discharged from the wet production of phosphoric acid by the action of sulfuric acid and phosphate rock. The main component is calcium sulfate dihydrate (CaSO 4 2H 2 O), but also contains undecomposed phosphate rock, SiO 2 , alumina, iron oxide, magnesium oxide, fluorine-containing substances, acidic insoluble organic substances and other impurities that are harmful to human health and biological growth, and affect the quality of phosphogypsum products. Among them, soluble P 2 o 5 Converted to Ca during hydration of building gypsum 3 (PO 4 ) 2 Precipitation, covering the surface of hemihydrate gypsum crystals, reducing the supersaturation of dihydrate gypsum crystallization, coarsening dihydrate gypsum crystals, showing that the setti...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/468C01P2006/80
Inventor 黄彬彬薛焱璟林茂兰
Owner 嘉兴市南湖区翊轩塑料五金厂(普通合伙)
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