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Method for large-scale absorption and high-value utilization of phosphate rock tailings

A technology for phosphate rock tailings and high value, applied in phosphate fertilizer, application, superphosphate and other directions, can solve the problems of difficult control and complex process, and achieve the effect of reducing serious impact, economical and reasonable, and reducing land resources.

Active Publication Date: 2022-04-05
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is complicated, and there are many kinds of external agents, so it is not easy to control

Method used

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  • Method for large-scale absorption and high-value utilization of phosphate rock tailings

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Effect test

Embodiment 1

[0037] with P 2 o 5 Grade 10.63%, CaO grade 35.06%, MgO grade 15.10%, a certain calcium-magnesium type phosphorus tailings in Mabian, Sichuan as raw materials, using the process technology of the present invention, the following steps are carried out:

[0038] (1) Flotation: Add phosphate rock tailings to the flotation equipment for flotation operation, add 4kg / t sulfuric acid as inhibitor, 0.6kg / t sodium hexametaphosphate as dispersant, 0.1kg / t WF-1# (Wengfu 1#) was used as a collector to carry out reverse flotation open-circuit operation to obtain flotation phosphorus concentrate and flotation phosphorus tailings;

[0039] (2) Acid leaching: the flotation phosphorus tailings obtained by flotation operations are heated and mechanically stirred in dilute sulfuric acid under normal pressure for leaching, the solid-liquid weight ratio is 1:3, the weight ratio of 97% concentrated sulfate ore is 1.0, and the leaching temperature 70°C, leaching time 1.5 hours. This operation res...

Embodiment 2

[0046] with P 2 o 5 A calcium-magnesium-type phosphorus tailings in Mabian, Sichuan Province with a grade of 9.56%, a grade of CaO of 37.84%, and a grade of MgO of 17.23% is used as a raw material, and the process technology of the present invention is used to carry out the following steps:

[0047] (1) Flotation: Add phosphate rock tailings to the flotation equipment for flotation operation, add 3.5kg / t sulfuric acid as inhibitor, 0.5kg / t sodium hexametaphosphate as dispersant, 0.05kg / t WF-1 #As a collector, carry out reverse flotation open-circuit operation to obtain flotation phosphorus concentrate and flotation phosphorus tailings;

[0048] (2) Acid leaching: the flotation phosphorus tailings obtained by flotation operations are heated and mechanically stirred in dilute sulfuric acid under normal pressure for leaching, the solid-liquid weight ratio is 1:2, the weight ratio of 97% concentrated sulfate ore is 1.1, and the leaching temperature 75°C, leaching time 1.0 hour. ...

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Abstract

The invention relates to the technical field of resource utilization of phosphate tailings, in particular to a method for large-scale absorption and high-value utilization of phosphate rock tailings. According to the invention, a novel process of reverse flotation-acidolysis conversion-multi-element separation and conversion is adopted, i.e., the phosphorite tailings which are difficult to utilize in a large scale are converted into phosphogypsum, magnesium sulfate heptahydrate and calcium superphosphate wet-process phosphate fertilizer products which can be utilized in a high-valued manner and conform to related national standards through the steps of flotation, acid leaching, desulfurization leaching, concentration crystallization and phosphorization reaction; an economical and feasible method is provided for large-scale consumption and high-value utilization of the high-magnesium phosphate tailings, resource waste and environmental pollution of the phosphate tailings are solved, and technical support is provided for comprehensive utilization of the same type of phosphate tailings in China.

Description

technical field [0001] The invention relates to the technical field of resource utilization of phosphorous tailings, in particular to a method for large-scale consumption and high-value utilization of phosphorous tailings. Background technique [0002] my country's phosphate rock resources are characterized by poverty, richness, and difficulty in mining and selection. They cannot be directly used in phosphorus chemical production, and need to be processed through mineral processing, which results in a huge amount of phosphate rock tailings. However, the utilization rate of phosphorus tailings in my country is only about 10%, and most of the phosphorus tailings are stored in tailings ponds or dumps, basically in a saturated or overloaded storage operation state. The stockpiling of tailings resources requires a large amount of land resources, which will virtually increase the operating costs of enterprises and affect the economic benefits of enterprises. At the same time, und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01F5/40C05B1/02
CPCY02W30/91
Inventor 毛益林邓杰惠博杨进忠刘小府王婧潘钢
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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