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Phosphogypsum reverse flotation, desilication and impurity removal process

A technology of reverse flotation desiliconization and phosphogypsum, which is applied in the field of phosphorus chemical industry, can solve the problems of high acrobatic content, low content and low concentration of CaO in solid decomposition products, reduce environmental pollution, help sustainable development, and extend industries chain effect

Inactive Publication Date: 2012-06-20
QUJING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in order to solve the decomposition of phosphogypsum to produce SO 2 In the furnace gas and CaO product process, the volume fraction of SO 2 The problem of low concentration and low content of CaO in solid decomposition products; at the same time, it also solves the problem of high content of acrobatics in the production of building materials and gypsum from phosphogypsum

Method used

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  • Phosphogypsum reverse flotation, desilication and impurity removal process
  • Phosphogypsum reverse flotation, desilication and impurity removal process

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1: The main chemical composition of the naturally air-dried phosphogypsum is calculated by weight percent: calcium oxide 28.92%, sulfur trioxide 41.25%, silicon dioxide 8.68%, total phosphorus 0.89%, total fluorine 0.29%, moisture 17.52%, acid Insoluble matter 11.47%. Weigh 300 grams of phosphogypsum sample into a 1L flotation tank, add water until the slurry concentration is about 35%, adjust the slurry for 1 minute, add regulator 5kg / t, reverse flotation collector dosage 480g / t, single reverse flotation After 6 minutes, the product in the tank is filtered by a suction machine to obtain a filter cake with a water content of less than 25%, and dried in an oven (temperature 100-200°C) to obtain high-grade gypsum. The main chemical composition is: CaSO 4 Mass fraction 82.06%, silicon dioxide 2.18%, total phosphorus 0.33%, total fluorine 0.12, acid insoluble matter 8.46%.

Embodiment 2

[0023] Embodiment 2: The main chemical composition of the naturally air-dried phosphogypsum is calculated by weight percentage: calcium oxide 28.90%, sulfur trioxide 40.51%, silicon dioxide 10.56%, total phosphorus 0.99%, total fluorine 0.43%, moisture 16.78%, acid Insoluble matter 11.76%. Weigh 300 grams of phosphogypsum sample into a 1L flotation tank, add water until the slurry concentration is about 35%, adjust the slurry for 1 minute, add regulator 6kg / t, reverse flotation collector 520g / t, and perform SLR flotation for 6 minutes , the product in the tank is filtered by a suction machine to obtain a filter cake with a moisture content of less than 25%, and dried in an oven (temperature 100-200°C) to obtain high-grade phosphogypsum. The main chemical composition is: CaSO 4 Mass fraction 81.25%, silicon dioxide 3.87%, total phosphorus 0.42%, total fluorine 0.23, acid insoluble matter 8.86%.

Embodiment 3

[0024] Embodiment 3: the main chemical composition of the naturally air-dried phosphogypsum is calculated by weight percent: calcium oxide 28.53%, sulfur trioxide 39.67%, silicon dioxide 12.34%, total phosphorus 1.25%, total fluorine 0.57%, moisture 17.25%, acid Insoluble matter 12.74%. Weigh 300 grams of phosphogypsum sample into a 1L flotation tank, add water until the slurry concentration is about 35%, adjust the slurry for 1 minute, add 7kg / t of regulator, and use 610g / t of reverse flotation collector Sweep for 6 minutes, then add collector 2 and sweep for 3 minutes, the dosage is 0.8kg / t, the product in the tank is filtered by a suction filter to get a filter cake with a water content of less than 25%, and dried in an oven (temperature 100-200°C) to obtain high-grade Phosphogypsum, the main chemical composition of which is expressed in weight percent: CaSO 4 Mass fraction 84.54%, silicon dioxide 2.64%, total phosphorus 0.26%, total fluorine 0.16, acid insoluble matter 8....

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Abstract

The invention relates to a phosphogypsum reverse flotation, desilication and impurity removal process; and targeting at the characteristic that the content of SiO2, phosphorus, F, acid insoluble substances and other impurities in phosphogypsum solid waste is high, a process of carrying out single or double reverse flotation by adding in regulator and collector is adopted; the regulator used in the reverse flotation is NaOH, Na2CO3, water glass, CaO, hydrochloric acid, sulfuric acid and other conventional regulator, and the used amount of the regulator is 1kg / t to 15kg / t. The collector used in the reverse flotation is fatty acid collector, negative ion collector, amine collector and other conventional desilicated collector, and the used amount of the collector is 1kg / t to 10kg / t. The process reduces the SiO2, phosphorus, F, acid insoluble substances and other impurities in the phosphogypsum, can prepare low-silicon and high-grade gypsum products, improve the grade and quality of gypsum, improve the mineral characteristics of the gypsum, and lay technical foundation for the industrialization of the phosphogypsum.

Description

technical field [0001] The invention belongs to the phosphorus chemical technology, and relates to a phosphogypsum reverse flotation desiliconization and impurity removal process to prepare low-silicon and high-quality gypsum. Background technique [0002] Phosphogypsum is the industrial waste generated during the reaction of phosphate rock and sulfuric acid to produce phosphoric acid in the wet-process phosphoric acid production process. 2 o 5 Total) will produce 4 to 5 tons of phosphogypsum. At present, the annual emission of phosphogypsum in the world is more than 200 million tons, but the utilization rate of phosphogypsum is less than 10%. The treatment and comprehensive utilization of phosphogypsum has become a worldwide problem. my country's phosphate fertilizer production ranks first in the world, and the production of phosphate fertilizer requires a large amount of phosphoric acid products, and also produces a large amount of phosphogypsum waste residue. The stack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/004B03D101/02
Inventor 郑绍聪陈吉书
Owner QUJING NORMAL UNIV
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