Method for reducing phosphorus pollution in phosphogypsum filling process by using modified quartz sand
A technology of quartz sand and phosphogypsum, which is applied in the field of phosphogypsum filling, can solve problems affecting the ecological environment, secondary pollution of the underground environment, eutrophication pollution, etc., and achieve reduced negative impacts, good economic and environmental benefits, and dissolution concentration Reduced effect
Active Publication Date: 2019-05-03
CENT SOUTH UNIV
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Problems solved by technology
However, since phosphogypsum contains a large amount of P, F, Mg and other elements, these harmful elements may be precipitated with bleeding after being filled underground, or dissolved under the action of rainwater leaching and groundwater immersion, causing secondary damage to the underground environment. Pollution
Phosphorus is the main factor that causes the rapid and massive reproduction of algae in water bodies. When phosphorus is discharged into natural water bodies, it will easily lead to the proliferation of algae and other microorganisms in the water, forming eutrophic pollution and seriously affecting the ecological environment.
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[0043] In an embodiment of the present invention, a method for reducing phosphorus pollution in the filling process of phosphogypsum by using modified quartz sand comprises the following steps:
[0044] (1) Collect quartz sand raw materials to obtain three types of quartz sand with different particle sizes: 0.1-0.25mm, 0.25-0.5mm, 0.5-1mm;
[0045] (2) Carry out coating modification treatment to quartz sand:
[0046] S1. Take 500g of cleaned quartz sand in a 500ml beaker, add 150ml of 2.5mol / L FeCl 3 solution, stir well. Put it into a drying box and heat and dry at 110°C, and finally move the sample to a muffle furnace and heat at 600°C for 3 hours;
[0047] S2. After 150g of quartz sand in step S1, add 75ml of 2.5mol / L FeCl 3 Solution, stir evenly, put it in a drying box and heat it at 110°C, put it in the air for 21 hours after every 3 hours of heating, and cycle 2-3 times like this to ensure the coating is stable;
[0048] S3. The modified quartz sand is first cleaned w...
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The invention discloses a method for reducing phosphorus pollution in phosphogypsum filling process by using modified quartz sand, belonging to the technical field of phosphogypsum filling. The quartzsand is subjected to modification coating treatment, the modified quartz sand with different particle sizes is used as part of aggregate and added into the filling slurry, and the ion concentration is measured by taking the effluent of the filling slurry; when the phosphogypsum filling body has been cured for the 28 days, the toxic leaching experiment is carried out; it was found that the phosphorus concentration in the phosphogypsum filling body added with modified quartz sand could be reduced to less than 0.5 mg / L, which reached the first-class standard of phosphorus discharge in industrialwastewater. The invention can remarkably reduce the dissolution concentration of the pollutants in the phosphogypsum filling body, reduce the negative influence of the phosphorus-containing leachatein the filling body on the groundwater, is beneficial to the green recycling process of the phosphorus chemical waste, is beneficial to the development of the phosphate rock enterprise, and obtains good economic and environmental benefits.
Description
technical field [0001] The invention belongs to the technical field of phosphogypsum filling, and in particular relates to a method for reducing phosphorus pollution in the filling process of phosphogypsum by using modified quartz sand. Background technique [0002] my country has abundant reserves of phosphate rock resources, and the annual production and consumption of phosphate rock exceeds 60 million tons, which has made important contributions to my country's food security and the stable development of agriculture. However, phosphate rock processing needs to produce a large amount of phosphogypsum slag, which needs to occupy a large amount of land for stockpiling, which has become a serious environmental problem and restricts the development of the phosphate fertilizer industry. With the introduction of national policies such as building green mines, improving comprehensive resource utilization, energy conservation and emission reduction, and environmental protection, t...
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IPC IPC(8): C04B28/14C04B20/10
Inventor 石英李夕兵程玲黄麟淇孙成赵艳艳
Owner CENT SOUTH UNIV