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Method for stabilizing/curing soluble phosphorus and fluorine in phosphogypsum

A phosphogypsum, soluble technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of reducing the moisture content of phosphogypsum, the harmless treatment of phosphogypsum is not thorough enough, high energy consumption, etc. , the effect of reducing moisture content

Inactive Publication Date: 2019-02-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This prior art has indeed achieved better technical effects. However, this prior art cannot reduce the water content of phosphogypsum at the same time, and the harmless treatment of phosphogypsum is not thorough enough. At the same time, this process is a high-energy complex process

Method used

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  • Method for stabilizing/curing soluble phosphorus and fluorine in phosphogypsum
  • Method for stabilizing/curing soluble phosphorus and fluorine in phosphogypsum
  • Method for stabilizing/curing soluble phosphorus and fluorine in phosphogypsum

Examples

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Embodiment 1

[0038] A method for stabilizing / solidifying soluble phosphorus and fluorine in phosphogypsum, using treatment agents including calcium carbonate (CaCO 3 ), magnesium carbonate (MgCO 3 ), calcium hydroxide (Ca(OH) 2 ) and polydimethylsiloxane, is characterized in that, comprises the following steps:

[0039] 1) Put phosphogypsum in container A, add water to container A under stirring, then add mixture A, and obtain mixture B after stirring;

[0040] Said mixture A comprises calcium carbonate, magnesium carbonate and calcium hydroxide;

[0041] The water content of the phosphogypsum is 20% to 30%;

[0042] The weight ratio of the phosphogypsum to water is 1:2.5;

[0043] The weight ratio of described calcium carbonate, magnesium carbonate and calcium hydroxide is 1: 1: 1;

[0044] The weight ratio of the mixture A to phosphogypsum is 0.5:100;

[0045] In the stirring state: the stirring rate is 100r / min.

[0046] 2) In a stirring state, add a hydrophobic surfactant to con...

Embodiment 2

[0058] A method for stabilizing / solidifying soluble phosphorus and fluorine in phosphogypsum, using treatment agents including calcium carbonate (CaCO 3 ), magnesium carbonate (MgCO 3 ), calcium hydroxide (Ca(OH) 2 ) and polydimethylsiloxane, is characterized in that, comprises the following steps:

[0059] 1) Put phosphogypsum in container A, add water to container A under stirring, then add mixture A, and obtain mixture B after stirring;

[0060] Said mixture A comprises calcium carbonate, magnesium carbonate and calcium hydroxide;

[0061] The water content of the phosphogypsum is 20% to 30%;

[0062] The weight ratio of the phosphogypsum to water is 1:2.5;

[0063] The weight ratio of described calcium carbonate, magnesium carbonate and calcium hydroxide is 1: 1: 1;

[0064] The weight ratio of the mixture A to phosphogypsum is 0.5:100;

[0065] In the stirring state: the stirring rate is 100r / min.

[0066] 2) In a stirring state, add a hydrophobic surfactant to con...

Embodiment 3

[0079] A method for stabilizing / solidifying soluble phosphorus and fluorine in phosphogypsum, using treatment agents including calcium carbonate (CaCO 3 ), magnesium carbonate (MgCO 3 ), calcium hydroxide (Ca(OH) 2 ) and polydimethylsiloxane, is characterized in that, comprises the following steps:

[0080] 1) Put phosphogypsum in container A, add water to container A under stirring, then add mixture A, and obtain mixture B after stirring;

[0081] Said mixture A comprises calcium carbonate, magnesium carbonate and calcium hydroxide;

[0082] The water content of the phosphogypsum is 20% to 30%;

[0083] The weight ratio of the phosphogypsum to water is 1:2.5;

[0084] The weight ratio of described calcium carbonate, magnesium carbonate and calcium hydroxide is 1: 1: 1;

[0085] The weight ratio of the mixture A to phosphogypsum (0.5: 100;

[0086] In the stirring state: the stirring rate is 100r / min.

[0087] 2) In a stirring state, add a hydrophobic surfactant to cont...

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Abstract

The invention discloses a method for stabilizing / curing soluble phosphorus and fluorine in phosphogypsum. The method is characterized by comprising the following steps: (1) placing the phosphogypsum in a container A, adding water into the container A at a stirring state, adding a mixture A and stirring to obtain a mixture B, wherein the mixture A comprises calcium carbonate, magnesium carbonate and calcium hydroxide; the weight ratio of the phosphogypsum to water is 1: (2.5 to 3); the weight ratio of the calcium carbonate to the magnesium carbonate to the calcium hydroxide is 1: 1: 1, and theweight ratio of the mixture A to the phosphogypsum is (0.5 to 1): 100; (2) at the stirring state, adding a hydrophobic surfactant into the container A and continuously stirring until homogeneity to obtain a mixture, wherein a weight volume ratio (mg:L) of the mixture B to polydimethylsiloxane is (5 to 10): 1; and (3) enabling the mixture obtained in step (2) to react for 2 to 3 hours at the stirring state, and unloading the material to obtain the stabilized / cured mixture.

Description

technical field [0001] The invention relates to the field of solid waste stabilization / solidification treatment methods, in particular to a method for stabilization / solidification of soluble phosphorus and fluorine in phosphogypsum. Background technique [0002] Phosphogypsum is an industrial solid waste produced during the production of wet-process phosphoric acid. When they are just filtered out of the filter device, the water content by mass is as high as 25-30% (so it is called "fresh phosphogypsum" to distinguish it from dry phosphogypsum without free water). The waste residue is weakly acidic and complex in chemical composition; including residual soluble phosphorus (P 2 o 5 ) and fluorine in ionic form. [0003] At present, there are two main ways to deal with phosphogypsum: stockpiling and recycling. According to statistics, the phosphogypsum stockpiled in my country accounts for about 90% of its total output, and only a small part of phosphogypsum can be compreh...

Claims

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Application Information

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IPC IPC(8): C04B11/26C04B11/00C01F11/46
CPCC01F11/46C01P2006/80C01P2006/82C04B11/005C04B11/26
Inventor 刘作华张柱张旭娟陶长元邱发成刘仁龙谢昭明杜军范兴孔令峰吴丙山唐金晶李兵王闯杨义王靓熊黠
Owner CHONGQING UNIV
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