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Phosphogypsum treating agent, phosphogypsum treating method, preparation method of phosphogypsum filling material and phosphogypsum filling material

A technology of phosphogypsum and treatment agent, which is applied in the field of harmless treatment of solid waste, and can solve problems such as high material cost, lack of effective use of gypsum, and obstacles to treatment technology

Pending Publication Date: 2020-07-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the harmless treatment technology of phosphogypsum is mainly based on chemical treatment. The basic principle of chemical treatment is to generate insoluble compounds by the reaction of certain cations with soluble phosphorus and fluorine, so as to realize its passivation. However, the raw materials used are all chemical Products, high material costs, and the lack of effective utilization of the treated gypsum hindered the implementation of these treatment technologies

Method used

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  • Phosphogypsum treating agent, phosphogypsum treating method, preparation method of phosphogypsum filling material and phosphogypsum filling material
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Embodiment 1

[0055] A phosphogypsum treatment agent, comprising the following components in mass percentage: 94.4% of calcined phosphorus tailings, 0.6% of ammonium sulfate, 5% of solid waste fine powder and 0% of activator. The above-mentioned phosphogypsum treatment agent is used for wet-process phosphoric acid to produce terminal fresh phosphogypsum, and the dosage of the treatment agent is 5% of the solid matter in the phosphogypsum, and the PO in the phosphogypsum leachate before and after treatment 4 3- , F - And detect the content of heavy metals As, Hg, Cd, Cr, Pb.

Embodiment 2

[0057] A phosphogypsum treatment agent comprises the following components in mass percentage: 93% of calcined phosphorous tailings, 0.8% of ammonium sulfate, 6.2% of solid waste fine powder and 0% of activator. The above-mentioned phosphogypsum treatment agent is used for wet-process phosphoric acid to produce fresh phosphogypsum at the end. 4 3- , F - And detect the content of heavy metals As, Hg, Cd, Cr, Pb.

Embodiment 3

[0059] A phosphogypsum treatment agent, comprising the following components in mass percentage: 95.4% of calcined phosphorus tailings, 0.6% of ammonium sulfate, 4% of solid waste fine powder and 0% of activator. The above-mentioned phosphogypsum treatment agent is used for the new row of phosphogypsum in the storage yard, only harmless treatment, the amount of the treatment agent is 8% of the solid content in the phosphogypsum, and the PO in the phosphogypsum leachate before and after treatment 4 3- , F - And detect the content of heavy metals As, Hg, Cd, Cr, Pb.

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Abstract

The invention relates to a phosphogypsum treating agent, a phosphogypsum treating method, a phosphogypsum filling material preparation method and a phosphogypsum filling material. The treating agent comprises the following components in percentage by mass: 27.7%-96.7% of calcined phosphate tailings, 0.3%-1% of ammonium sulfate, 3%-68% of solid waste micro powder and 0-3.5% of an alkaline activator, wherein the calcined phosphate tailings are calcined products of high-magnesium phosphate tailings. Based on the phosphogypsum treating agent, harmless treatment of phosphogypsum can be achieved, effective utilization of solid waste high-magnesium phosphate tailings can be achieved, and meanwhile the strength requirement of phosphogypsum serving as an engineering filling material is met.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of solid waste, in particular to a phosphogypsum treatment agent, a treatment method for phosphogypsum, a preparation method for a phosphogypsum filling material and a phosphogypsum filling material. Background technique [0002] Phosphogypsum is a by-product of wet process production of phosphoric acid, and every ton of phosphoric acid produced will produce 3-5 tons of phosphogypsum. The most harmful components of phosphogypsum to the environment are soluble phosphorus and fluorine. At this stage, 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 comprehensively utilized. If phosphogypsum is piled up, soluble phosphorus and fluorine will gradually transfer to the surrounding soil, groundwater and rive...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B18/04
CPCC04B20/023C04B18/0445Y02W30/91
Inventor 曹宏薛俊骆真李先福季家友石和彬
Owner WUHAN INSTITUTE OF TECHNOLOGY
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