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Ardealite flotation, washing, decolorizing and purifying method

A purification method and phosphogypsum technology, applied in flotation, solid separation, etc., can solve the problems of low utilization rate of phosphogypsum, reduce stockpiling and environmental pressure, have obvious effect, and be easy to decolorize

Pending Publication Date: 2022-04-12
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The comprehensive utilization of phosphogypsum in my country is still in a stage of exploration and development. The utilization rate of phosphogypsum in most enterprises is still very low, and a large amount of phosphogypsum is still accumulated every year, causing huge environmental pressure.

Method used

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  • Ardealite flotation, washing, decolorizing and purifying method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A phosphogypsum CaSO in Yunnan 4 2H 2 O content is 84.66%, phosphogypsum whiteness is 34.4%, SiO 2 The content of the content is 6.54%, carry out decolorization purification flotation process test, process flow chart sees figure 1 , including the following steps:

[0026] 1) Slurry the phosphogypsum to a reasonable mass concentration of 30%, perform the first reverse flotation, add the collector ether diamine (C10 ether diamine) at an amount of 0.05kg / t phosphogypsum, and carry out air flotation Until the foam is white, the reverse flotation foam remains, and the material remaining in the flotation tank continues the second reverse flotation. In the second reverse flotation, add collector ether diamine, the dosage is 0.025kg / t phosphogypsum, inflate flotation until the foam is white, the reverse flotation foam is retained, and the materials left in the flotation tank continue to Three reverse flotation. In the third reverse flotation, add collector ether diamine, t...

Embodiment 2

[0029] A phosphogypsum CaSO in Yunnan 4 2H 2 O content is 84.66%, phosphogypsum whiteness is 34.4%, SiO 2 The content of the content is 6.54%, carries out decolorization purification flotation process test, comprises the following steps:

[0030] 1) Slurry the phosphogypsum to 40% mass concentration, carry out the first reverse flotation, add the collector ether diamine (C12 ether diamine), the dosage is 0.06kg / t phosphogypsum, aerate the flotation to foam It is white, and the reverse flotation foam remains, and the material remaining in the flotation tank continues the second reverse flotation. In the second reverse flotation, add collector ether diamine, the dosage is 0.04kg / t phosphogypsum, inflate flotation until the foam is white, the reverse flotation foam is retained, and the materials left in the flotation tank continue to Three reverse flotation. In the third reverse flotation, add collector ether diamine, the dosage is 0.04kg / t phosphogypsum, inflate flotation un...

Embodiment 3

[0033] A phosphogypsum CaSO in Yunnan 4 2H 2 O content is 84.66%, phosphogypsum whiteness is 34.4%, SiO 2 The content of the content is 6.54%, carries out decolorization purification flotation process test, comprises the following steps:

[0034] 1) Slurry the phosphogypsum to 45% mass concentration, carry out the first reverse flotation, add the collector ether diamine (coco ether diamine) in an amount of 0.08kg / t phosphogypsum, and inflate the flotation to foam It is white, and the reverse flotation foam remains, and the material remaining in the flotation tank continues the second reverse flotation. In the second reverse flotation, add collector ether diamine, the dosage is 0.05kg / t phosphogypsum, inflate flotation until the foam is white, the reverse flotation foam is retained, and the materials left in the flotation tank continue to Three reverse flotation. In the third reverse flotation, add collector ether diamine, the dosage is 0.05kg / t phosphogypsum, inflate flota...

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Abstract

The invention discloses an ardealite flotation, washing, decoloration and purification method which comprises the following steps: 1) adding water into ardealite for size mixing, and fully stirring and dispersing; (2) adding an ether diamine collecting agent into the phosphogypsum dispersed slurry, stirring and mixing the slurry, and carrying out first reverse flotation on the phosphogypsum until foams are white; an ether diamine collecting agent is added, and secondary reverse flotation is carried out until foam is white; the ether diamine collecting agent is added again, stirring and size mixing are carried out, third reverse flotation is carried out, flotation is carried out till foam is white, and the obtained in-tank product is phosphogypsum obtained after flotation, decoloration and purification; and (3) adding a dispersing agent into the phosphogypsum slurry, removing fine-grained impurities by utilizing elutriation, and concentrating, filtering and drying to obtain a finished product of high-purity phosphogypsum. According to the ardealite decoloring, purifying and flotation technology, the technological process is more convenient and faster, the decoloring and purifying effect is obvious, the utilization rate of ardealite is effectively increased, and stockpiling and environmental pressure are reduced.

Description

technical field [0001] The invention belongs to the technical field of waste recycling, and in particular relates to a phosphogypsum flotation, washing, decolorization and purification method. Background technique [0002] Phosphogypsum is mainly derived from general industrial solid waste produced by the wet process phosphoric acid process, and more than 80% of its composition is CaSO 4 2H 2 O also contains a small amount of impurities such as phosphorus, fluorine, iron, aluminum, silicon, and organic carbon. The output of phosphogypsum in my country is relatively large, and there is a large environmental risk and storage pressure. As the state pays more and more attention to production safety and the environment, and relevant regulations and laws become more detailed and perfect, enterprises have more and more urgent needs to solve the problems of storage and comprehensive utilization of phosphogypsum. The comprehensive utilization of phosphogypsum in my country is stil...

Claims

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Application Information

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IPC IPC(8): B03D1/01B03D1/02B03D101/02
Inventor 罗惠华国亚非张振翼张正虎闫雅雯赵军刘宇桐
Owner WUHAN INSTITUTE OF TECHNOLOGY
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