Phosphorus gypsum purification treatment method

A treatment method, phosphogypsum technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of small treatment volume, high price, secondary pollution, etc., achieve large treatment volume, efficiently remove or reduce impurities Effect

Active Publication Date: 2016-10-12
CHINA CONSTR EIGHT ENG DIV CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lime neutralization method can eliminate the influence of soluble phosphorus and fluorine, but it is only suitable for the situation where the quality of phosphogypsum is relatively stable, and the treatment efficiency is low; the water washing method can effectively remove soluble impurities and organic matter, but the sewage discharge after treatment will cause Secondary pollution; flotation treatment can effective

Method used

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  • Phosphorus gypsum purification treatment method
  • Phosphorus gypsum purification treatment method
  • Phosphorus gypsum purification treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add washing water to the phosphogypsum raw material, the weight ratio of washing water and phosphogypsum raw material is 2:1, stir evenly, let it stand for layering, remove the organic layer floating on it, and use a suspension separator to separate the solid and liquid of the remaining material Obtain washed phosphogypsum solids and washing wastewater; add cleaning water to the washed phosphogypsum solids, the ratio of cleaning water to washed phosphogypsum solids is 2.5:1 by weight, and use a suspension separator to separate the solid and liquid after stirring evenly Separation of washed phosphogypsum solids and cleaning wastewater; neutralizing the washing wastewater and cleaning wastewater with saturated calcium hydroxide solution and then standing for stratification, the obtained upper layer of clear water is recycled and used as the washing water for the next batch of phosphogypsum raw materials and wash water, resulting in Ca 3 (PO 4 ) 2 Precipitation is used a...

Embodiment 2

[0030] Add washing water to the phosphogypsum raw material, the weight ratio of washing water and phosphogypsum raw material is 3:1, stir evenly, let it stand for layering, remove the organic layer floating on it, and use a suspension separator to separate the remaining material from solid to liquid Obtain washed phosphogypsum solids and washing wastewater; add cleaning water to the washed phosphogypsum solids, the ratio of cleaning water to washed phosphogypsum solids is 3:1 by weight, and use a suspension separator to separate the solid and liquid after stirring evenly Separation of washed phosphogypsum solids and cleaning wastewater; neutralizing the washing wastewater and cleaning wastewater with saturated calcium hydroxide solution and then standing for stratification, the obtained upper layer of clear water is recycled and used as the washing water for the next batch of phosphogypsum raw materials and wash water, resulting in Ca 3 (PO 4 ) 2 Precipitation is used as a r...

Embodiment 3

[0032] Add washing water to the phosphogypsum raw material. The weight ratio of washing water and phosphogypsum raw material is 2.5:1. Stir evenly and let it stand for layering. Remove the organic layer floating on the top, and use a suspension separator to separate the remaining material from solid to liquid. Obtain washed phosphogypsum solids and washing wastewater; add cleaning water to the washed phosphogypsum solids, the ratio of cleaning water and washed phosphogypsum solids is 2:1 by weight, and use a suspension separator to Separation of washed phosphogypsum solids and cleaning wastewater; neutralizing the washing wastewater and cleaning wastewater with saturated calcium hydroxide solution and then standing for stratification, the obtained upper layer of clear water is recycled and used as the washing water for the next batch of phosphogypsum raw materials and wash water, resulting in Ca 3 (PO 4 ) 2 Precipitation is used as a raw material for the preparation of phosp...

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Abstract

The invention provides a phosphorus gypsum purification treatment method, which comprises the following steps: (1) adding washing water into a phosphorus gypsum raw material, performing standing demixing to remove an organic matter layer floating at the top after uniform stirring, and performing solid-liquid separation on a residual material to obtain washed phosphorus gypsum solids and washing wastewater; (2) neutralizing the washing wastewater by virtue of a saturated calcium hydroxide solution, and performing standing demixing to obtain upper-layer clear water used as the washing water in step (1) and precipitates used as a raw material for preparing phosphoric acid. Preferably, between steps (1) and (2), the method further comprises the following step: (11) adding cleaning water into the washed phosphorus gypsum solids, and performing solid-liquid separation to obtain cleaned phosphorus gypsum solids and cleaning wastewater after uniform mixing. In step (2), the cleaning wastewater is mixed with the washing wastewater, and the upper-layer clear water is further used as the cleaning water in step (11). According to the method, impurities can be efficiently removed or reduced, and the method is economical, environment-friendly, high in treatment capacity, ingenious in design, easy to operate and suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of impurity removal, in particular to the technical field of impurity removal methods, in particular to a method for removing impurities from phosphogypsum. Background technique [0002] Phosphogypsum is an industrial waste produced in the wet-process phosphoric acid production process, and its main component is calcium sulfate dihydrate (CaSO 4 2H 2 O), its mass fraction is usually more than 85%. The free water content in phosphogypsum is relatively high, the mass fraction is about 20-30%, and the pH value is generally between 2-6. Phosphogypsum contains soluble phosphoric acid and its salts, fluoride, organic matter and other harmful substances that are harmful to human health and biological growth. Soluble phosphorus is converted into Ca when the building gypsum hardens. 3 (PO 4 ) 2 Precipitation covers the surface of gypsum crystals, delaying the setting time and reducing the strength; soluble fluor...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01B25/32
CPCC01B25/32C01F11/468C01P2006/80
Inventor 金钢马荣全苗冬梅连春明
Owner CHINA CONSTR EIGHT ENG DIV CORP LTD
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