Resourceful treatment and utilization method of ardealite leachate

A technology of leachate and phosphogypsum, applied in the field of environmental engineering, can solve problems such as a large amount of solid waste, corrosion of pipeline equipment, and degradation of phosphoric acid quality, and achieve the effects of practical and reliable treatment process, high removal rate, and high utilization rate

Inactive Publication Date: 2021-09-03
WUHAN INSTITUTE OF TECHNOLOGY +1
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Problems solved by technology

At present, the treatment of phosphogypsum leachate is mainly neutralization precipitation method, chemical coagulation method and closed recycling method. Chemical treatment is likely to generate a large amount of solid waste and cause secondary pollution, while closed recycling of leachate will Corrosion of pipeline equipment, while the circulating fluorine, arsenic, lead, etc. cause the quality of phosphoric acid to decline

Method used

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  • Resourceful treatment and utilization method of ardealite leachate

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Embodiment 1

[0032] 1) to 30% strength phosphogypsum leachate appropriate amount of sodium hydroxide solution to remove part of the impurities, adjusting the pH of the solution to between 4-5 and stirred for 10-20min the reaction time, the reaction temperature is room temperature, completion of the reaction after filtration, the filtrate was retained.

[0033] 2) To the filtrate obtained adding oxalic acid, the molar ratio of the dosage of calcium oxalate is 1.3: 1, the reaction mixture was stirred at room temperature while adjusting the pH of the solution to 5 to 6 with sodium hydroxide solution, the reaction was stirred time is 20-30min, after the reaction, was filtered, and the filtrate obtained with calcium oxalate.

[0034] 3) induce crystallization fluidized bed reactor ammonia nitrogen wastewater and adding magnesium oxide to the resulting filtrate, to control the dosage in N: Mg: P = 1.1: 1.2: 1, while a 30% sodium hydroxide solution PH value is adjusted to 8 to 10, the reaction was st...

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Abstract

The invention discloses a resourceful treatment and utilization method of ardealite leachate, which comprises the steps of adding hydroxide into the ardealite leachate to adjust the pH value to 4-5, stirring and reacting to remove part of metal ions and impurities in the solution, and filtering to remove precipitates; adding oxalic acid into the obtained filtrate, adjusting the pH value of the solution to 6 with hydroxide, carrying out a stirring reaction to enable calcium ions to react with oxalic acid to generate calcium oxalate, and filtering to remove precipitates; introducing the obtained filtrate into a fluidized bed induced crystallization reactor, adjusting the pH value to 8-10 with a hydroxide solution, adding ammonia nitrogen wastewater and magnesium oxide for a reaction, and obtaining high-purity magnesium ammonium phosphate crystal obtained through filtering and drying; carrying out membrane treatment on the obtained filtrate to remove the fluorine element; carrying out stirring reaction on the obtained filtrate and a traditional Chinese medicine residue adsorption material to remove the arsenic element; and carrying out tail water treatment on the obtained filtrate to enable the filtrate to reach the emission standard.

Description

Technical field [0001] The present invention belongs to the field of environmental engineering, particularly to a resource phosphogypsum leachate treatment using the method. Background technique [0002] Phosphogypsum is a by-product phosphogypsum leachate produced by the wet process phosphoric acid production process by diafiltration and bulk form, which can be divided into two main sources of leachate parts, phosphogypsum is placed in a yard with its own water, while the other part of natural cause precipitation, which is mainly characterized in that strongly acidic leachate, and containing phosphorus, fluoride, sulfate, calcium, magnesium, and heavy metals as arsenic, lead, could easily lead to serious surface water, groundwater, soil and other environmental pollution. For phosphogypsum present mainly in leachate and precipitation, chemical coagulation method and a closed recycling, chemical treatment readily produce large amounts of solid waste, secondary pollution, and will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/14C02F103/06
CPCC02F9/00C02F1/66C02F1/001C02F1/44C02F1/286C02F1/58C02F2101/10C02F2101/105C02F2101/14C02F2101/103C02F2103/06
Inventor 张莉许瑞
Owner WUHAN INSTITUTE OF TECHNOLOGY
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