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A kind of pretreatment process of phosphogypsum

A phosphogypsum and pretreatment technology, applied in the field of renewable resources and the environment, can solve the problems of immature research technology, difficulty in removing eutectic phosphorus, and small secondary pollution, so as to eliminate secondary pollution, easy control of process conditions, High volume effects

Inactive Publication Date: 2015-09-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flash burning method is a new heat treatment process that has emerged at present. It is the only effective way to eliminate the influence of eutectic phosphorus, and its secondary pollution is small, and the energy consumption of equipment production is low, but the current treatment capacity is small
Calcination treatment is difficult to remove eutectic phosphorus when the temperature is low, and the treatment consumes a lot of energy
Microwave heating treatment of phosphogypsum is also a new impurity removal method. It has no secondary pollution, is faster and energy-saving than traditional heating methods, and can quickly remove organic matter, but the current research process is not mature enough.

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  • A kind of pretreatment process of phosphogypsum

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 5.0kg of Guangxi Luzhai phosphogypsum, disperse it in 28.3kg of tap water that meets the sanitary standards for domestic water, stir it evenly and let it stand for 10 minutes to remove the organic impurities floating on the upper layer, then add 75.0g of analytically pure calcium oxide, generally There are many impurities in industrial calcium oxide. In order to avoid the introduction of impurities, analytically pure calcium oxide is used. After fully stirring, use a 40-mesh sieve to sieve through a sieve to remove large particles of hard impurities.

[0021] Add the mixture of phosphogypsum and water that has been sieved into a conical mixing bucket that can be stirred horizontally, circulated vertically and can precisely control its stirring speed. After stirring for 15 minutes, inject the sample from the middle of the mineral separation column And carry out sorting and separation, the bottom of the mineral separation column is continuously replenished with suppl...

Embodiment 2

[0023] Weigh 5.0kg of phosphogypsum, disperse it in 20.0kg of water, stir it evenly and let it stand for 15 minutes to remove the organic impurities floating on the upper layer, then add 100g of analytically pure calcium oxide, stir well and then use a 60-mesh sieve to sieve through the coarse , Remove large particles of hard impurities.

[0024]Put the mixture of phosphogypsum and water that has been sieved into a conical mixing bucket, and after stirring for 15 minutes, inject samples from the middle of the mineral separation column for sorting and separation, and the bottom of the mineral separation column is continuously replenished Supply water to control the ratio of phosphogypsum to water in the mineral separation column to be 1:4, and at the same time, the bottom is discharged into the system through an air compressor to let air in, and the upper part of the mineral separation column is connected to the atmosphere to control the mineral deposit of the mineral separation...

Embodiment 3

[0026] Weigh 5.0kg of phosphogypsum, disperse it in 15.0kg of tap water that meets the national domestic water sanitation standards, stir it evenly and let it stand for 10 minutes to remove organic impurities floating on the upper layer, then add 50.0g of analytically pure calcium oxide, and stir well Sieve through a 40-mesh sieve to remove large hard impurities.

[0027] Put the mixture of phosphogypsum and water that has been sieved into a conical mixing bucket that can stir horizontally, circulate vertically and precisely control the stirring speed. After stirring for 20 minutes, inject the sample from the middle of the mineral separation column and For sorting and separation, the bottom of the mineral sorting column is continuously supplemented with supply water to control the ratio of phosphogypsum to water in the mineral sorting column to be 1:3, and at the same time, the bottom is discharged into the system through an air compressor to enter air, and mineral sorting The...

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Abstract

The invention discloses a pre-treatment technology of ardealite. The technology comprises the following steps: firstly dispersing the ardealite in water, standing for layering, and removing organic impurities floating on the upper layer; then adding calcium oxide to remove soluble P2O5 and fluorides; then adding the mixture of ardealite and water in a mineral separation column, and controlling the height of a mineral deposit inside the mineral separation column. The flow rate of supplemental water is adjusted, so that the air pressure, air flow rate, air pressurization time and air pressure relief time of an air compressor exhaust system are controlled, the fluctuation range of water level inside a pulse water inlet pipe of a pulse system inside the mineral separation column, the fluctuation frequency of the pulse system and the discharge capacity of a discharge opening on the mineral separation column are controlled, heavy components and light components in the mixture of ardealite and water are effectively separated, and the purpose of removing the impurities is achieved. The technology is economic and environment-friendly, can effectively remove or reduce the impurities in the ardealite, improves the quality of the ardealite, is large in treatment capacity, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a pretreatment process of phosphogypsum, which belongs to the technical field of renewable resources and environment. Background technique [0002] Phosphogypsum is the solid waste discharged from the wet production of phosphoric acid by the action of sulfuric acid and phosphate rock. The main component is calcium sulfate dihydrate (CaSO 4 2H 2 O), but also contains undecomposed phosphate rock, SiO 2 , alumina, iron oxide, magnesium oxide, fluorine-containing substances, acidic insoluble organic substances and other impurities that are harmful to human health and biological growth, and affect the quality of phosphogypsum products. Among them, soluble P 2 o 5 Converted to Ca during hydration of building gypsum 3 (PO 4 ) 2 Precipitation, covering the surface of hemihydrate gypsum crystals, reducing the supersaturation of dihydrate gypsum crystallization, coarsening dihydrate gypsum crystals, showing that the setting time o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
Inventor 陈红闯杨祥张雪范晓雅徐晓晴肖文丁杨眉刘晓刚
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)