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Phosphogypsum treatment method

A treatment method and technology of phosphogypsum, which is applied in the field of phosphogypsum treatment, can solve problems such as ineffective utilization of resources and unstable performance of phosphogypsum, and achieve the effect of reduced content and uniform particles

Inactive Publication Date: 2015-05-20
HENAN JUNENG NEW BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of phosphogypsum is unstable, so that this kind of resource with vast sources and excellent architectural functions cannot be effectively utilized

Method used

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  • Phosphogypsum treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A method for treating phosphogypsum, comprising the following steps: ① Pretreatment: aging the phosphogypsum until the attached water content is 9% (mass content); ② Compounding reaction: adding a modifier to the aged phosphogypsum , stir until the reaction is complete, the weight ratio of modifier to phosphogypsum is 1:25, the modifier is a mixture of lime and pozzolanic mixed material, and the weight ratio of lime and pozzolanic mixed material is 1:2.5; ③ drying : drying the phosphogypsum after compounding reaction at 400° C. until the attached water content of the phosphogypsum is dried below 2%; ④ calcining; calcining the dried phosphogypsum at 220° C. for 9 minutes.

[0009] The performance comparison before and after the phosphogypsum treatment in this embodiment is shown in Table 1.1:

[0010] Table 1.1

[0011]

[0012] The strength comparison before and after treatment of phosphogypsum in this embodiment is shown in Table 1.2:

[0013] Table 1.2

[0014] ...

Embodiment 2

[0017] A method for treating phosphogypsum, comprising the following steps: ① Pretreatment: aging the phosphogypsum until the attached water content is 8% (mass content); ② Compounding reaction: adding a modifier to the aged phosphogypsum , stir until the reaction is complete, the weight ratio of modifier to phosphogypsum is 1:100, the modifier is a mixture of lime and pozzolanic mixed material, and the weight ratio of lime and pozzolanic mixed material is 1:1.5; ③ drying : drying the phosphogypsum after compounding reaction at 360°C until the attached water content of the phosphogypsum is dried below 2%; ④ calcining: calcining the dried phosphogypsum at 200°C for 12 minutes.

[0018] The performance comparison before and after the phosphogypsum treatment in this embodiment is shown in Table 2.1:

[0019] Table 2.1

[0020]

[0021] The strength comparison before and after treatment of phosphogypsum in this embodiment is shown in Table 2.2:

[0022] Table 2.2

[0023] ...

Embodiment 3

[0026] A method for treating phosphogypsum, comprising the following steps: ① Pretreatment: aging the phosphogypsum until the attached water content is 10% (mass content); ② Compounding reaction: adding a modifier to the aged phosphogypsum , stir until the reaction is complete, the weight ratio of modifier to phosphogypsum is 8:100, the modifier is a mixture of lime and pozzolanic mixed material, and the weight ratio of lime and pozzolanic mixed material is 1:4; ③ drying : drying the phosphogypsum after compounding reaction at 450°C until the attached water content of the phosphogypsum is dried below 2%; ④ calcining: calcining the dried phosphogypsum at 240°C for 6 minutes.

[0027] The performance comparison before and after the phosphogypsum treatment in this embodiment is shown in Table 3.1:

[0028] chart 3.1

[0029]

[0030] The strength comparison before and after treatment of phosphogypsum in this embodiment is shown in Table 3.2:

[0031] Table 3.2

[0032] ...

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Abstract

The invention belongs to a phosphogypsum treatment method. The phosphogypsum treatment method comprises the following steps: (1) pre-treating: ageing phosphogypsum until the content of attached water is 8-10%; (2) combination reaction: adding a modifying agent into the aged phosphogypsum, stirring until the reaction is complete, wherein the weight ratio of the modifying agent to the phosphogypsum is (1-8): 100, the modifying agent is a mixture of lime and a cinerite mixed material, and the weight ratio of the lime to the cinerite mixed material is 1: (1.5-4); (3) drying: drying the phosphogypsum at 360-450 DEG C after the combination reaction until the content of attached water of the phosphogypsum is lower than 2%; and (4) calcining: calcining the dried phosphogypsum at 200-240 DEG C for 6-12 minutes. Granules of the phosphogypsum are more uniform by ageing, and due to the modification of the modifying agent, the acidity of the phosphogypsum is reduced, and the contents of water-soluble fluorine and water-soluble phosphorus are decreased; and then, the phosphogypsum is changed into building phosphogypsum with good performance by drying and calcining.

Description

technical field [0001] The invention relates to the technical field of recycling solid waste phosphogypsum, in particular to a method for treating phosphogypsum. Background technique [0002] Phosphogypsum is the waste residue discharged by phosphorus chemical enterprises. Every ton of phosphoric acid produced will produce about 5 tons of by-product phosphogypsum. At present, the utilization rate of phosphogypsum is extremely low. pressure. Building phosphogypsum and its products, which are mainly composed of β-hemihydrate gypsum, obtained by dehydration of phosphogypsum are an effective way of resource utilization, and at the same time can achieve the purpose of consuming a large amount of phosphogypsum waste residue. The performance of phosphogypsum is unstable, so that this kind of resource with vast sources and excellent architectural functions cannot be effectively utilized. The phosphorous building gypsum obtained by calcining the chemically modified phosphogypsum ha...

Claims

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Application Information

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IPC IPC(8): C04B11/26
Inventor 谢国刚刘永旭刘永杰刘湘勇赵建新谷晓峰赵云王晓明
Owner HENAN JUNENG NEW BUILDING MATERIAL
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