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Flotation method for efficiently purifying phosphogypsum

A phosphogypsum, high-efficiency technology, applied in the field of phosphogypsum treatment, can solve the problems of low dihydrate gypsum content and unfavorable reuse of building gypsum, and achieve the effects of easy equipment cost, low equipment corrosion, and simple process flow

Pending Publication Date: 2022-06-24
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flotation method for efficiently purifying phosphogypsum, and solve the problem that the low content of dihydrate gypsum after purification of existing phosphogypsum is not conducive to its reuse as building gypsum

Method used

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  • Flotation method for efficiently purifying phosphogypsum
  • Flotation method for efficiently purifying phosphogypsum
  • Flotation method for efficiently purifying phosphogypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 A flotation method for efficiently purifying phosphogypsum is shown, comprising the steps of:

[0025] S1. The phosphogypsum from the wet-process phosphoric acid production transfer table filter 1 is pumped into the pump tank for slurry making, and the slurry concentration is 25% to 35%;

[0026] S2. Pump the slurry into the high-frequency vibrating screen 2 for screening, the +100-mesh coarse-grained product on the screen enters the tailings slag silo, and the -100-mesh product under the sieve is pumped into the hydrocyclone 3 for classification;

[0027] S3. The overflow product in the hydrocyclone 3 enters the tailings collection tank 4, and the sand settling product in the hydrocyclone 3 enters the dewatering screen 5;

[0028] S4. The product under the dewatering screen 5 enters the tailings collection tank 4, the product on the dewatering screen 5 enters the mineralization tank 6, and the pressure filter return water is added to adjust the slurry to a co...

Embodiment 2

[0032] The phosphogypsum produced by the wet-process phosphoric acid plant of a chemical fertilizer plant was transported from the rotary filter 1 to the reslurry tank, and diluted water was added, and the phosphogypsum slurry with a concentration of 30.7% was obtained during continuous stirring. Pump the slurry into the high-frequency vibrating screen 2 for screening, and the +100 mesh coarse-grained products on the screen enter the tailings slag storage.

[0033] The -100-mesh product under the sieve is driven into the hydrocyclone 3 through the slurry pump, and the working pressure is 0.10MPa, the concentration of the overflow product is 13.71%, the concentration of the settled sand product is 56.88%, and the overflow product flows to the tailings collection tank 4 by itself , the sand products flow to the dewatering screen 5 through the pipeline, and the mesh number of the screen is 40 meshes.

[0034] The phosphogypsum slurry is further removed from impurities such as wat...

Embodiment 3

[0038] The phosphogypsum produced by the wet-process phosphoric acid plant of a chemical fertilizer plant was transported from the rotary table filter 1 to the reslurry tank, and diluted water was added, and the phosphogypsum slurry with a concentration of 32.03% was obtained during continuous stirring. Pump the slurry into the high-frequency vibrating screen 2 for screening, and the +100 mesh coarse-grained products on the screen enter the tailings slag storage.

[0039] The -100-mesh product under the sieve is driven into the hydrocyclone 3 by the slurry pump, and the working pressure is 0.11MPa, the concentration of the overflow product is 15.16%, and the concentration of the settled sand product is 57.34%. The overflow product flows to the tailings collection tank 4 by itself , the sand product flows to the dewatering screen 5 through the pipeline, and the mesh number of the screen is 60 meshes.

[0040] The phosphogypsum slurry is further removed from impurities such as w...

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Abstract

The invention discloses a flotation method for efficiently purifying ardealite, and relates to the technical field of ardealite treatment. The method comprises the following steps: pumping ardealite from a transfer table filter in wet-process phosphoric acid production into a pump pool to make slurry, pumping the slurry into a high-frequency vibrating screen for screening, feeding oversize + 100-mesh coarse-grained products into a tailing slag warehouse, and pumping undersize-100-mesh products into a hydrocyclone for grading; an overflow product in the hydrocyclone enters a tailing collecting tank, and a sand setting product in the hydrocyclone enters a dewatering screen; undersize products of the dewatering screen enter a tailing collecting tank, oversize products of the dewatering screen enter a mineralization tank, filter pressing return water is added for size mixing, lime powder is added to adjust the pH value, and an efficient desilicication collecting agent is added for sufficient mixing; the mixed slurry is pumped into a flotation device through a conveying pump for reverse flotation, flotation concentrate enters a concentrate intermediate tank, the slurry in the concentrate intermediate tank is pumped into a filter press, a product obtained after filter pressing is a purified ardealite product, and filter press filtrate serves as filter pressing return water and returns into the mineralization tank for recycling.

Description

technical field [0001] The invention relates to the technical field of phosphogypsum treatment, in particular to a flotation method for efficiently purifying phosphogypsum. Background technique [0002] Phosphogypsum is a by-product of the production of phosphoric acid by using sulfuric acid to decompose phosphate rock during the production of wet phosphoric acid. Its main component is calcium sulfate (CaSO) 4 ·nH 2 O, the reaction formula is Ca 5 F(PO 4 ) 3 +5H 2 SO 4 +10H 2 O=5CaSO 4 ·nH 2 O+3H 3 PO 4 +HF↑, its content can generally reach about 70% to 90%. Phosphogypsum contains undecomposed phosphate rock, unwashed phosphoric acid, fluorine, iron, aluminum compounds, acid insoluble matter, organic matter and other impurities, which brings great difficulties to the resource utilization of phosphogypsum. Generally, 1t of phosphoric acid produced by wet method can discharge 4-4.5t of phosphogypsum. The stockpile of phosphogypsum in my country has exceeded 500 mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00
CPCB03B9/00
Inventor 郭永杰李海兵范培强陈赐云李江丽杨稳权张华
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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