Fluorgypsum-based passivator for heavy metal contaminated farmland soil and preparation method of fluorgypsum-based passivator

A passivating agent and gypsum-based technology, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of low utilization route and utilization rate, difficult environment and utilization, easy access to water bodies, etc. , to achieve the effect of good quality recovery, large decline and low cost

Inactive Publication Date: 2018-02-16
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Fluorogypsum is an industrial waste produced in the production of hydrofluoric acid. In 2010, my country added 3.76 million tons of fluorogypsum, plus the discarded fluorogypsum over the years, totaling more than 30 million tons. Acid and sulfuric acid are highly corrosive, especially the fluorine ions contained in them, which can easily enter the water body and cause serious environmental hazards after excessive accumulation
In addition, there are many impurities in fluorogypsum, complex components, and the main component is anhydrous gypsum with extremely slow hydration, which seriously affects the environment and is difficult to use. At present, there are only plastering gypsum, cement retarder and other traditional fields. research, its access and utilization are low

Method used

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  • Fluorgypsum-based passivator for heavy metal contaminated farmland soil and preparation method of fluorgypsum-based passivator
  • Fluorgypsum-based passivator for heavy metal contaminated farmland soil and preparation method of fluorgypsum-based passivator
  • Fluorgypsum-based passivator for heavy metal contaminated farmland soil and preparation method of fluorgypsum-based passivator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Fluorogypsum-based passivation agent ratio: based on 30% fluorogypsum, add 24% blast furnace manganese slag, 25% steel slag, 15% phosphorous tailings, 3.0% white mud, mix and stir for 30-45 minutes, after 24 hours of stuffing Add 3% admixture (25% carboxymethyl cellulose, 10% sodium dodecylbenzene sulfonate, 9% lauryl alcohol, 16% acetyl dodecylamine, 40% melamine compound), and then mix the mixture Grind in a ball mill for 40 minutes to prepare a fluorogypsum-based passivator.

[0025] The heavy metal content in the soil of a polluted farmland is shown in the table below. Add 1100kg of passivator per mu to the polluted soil for remediation. Steel slag and white mud are OH under the action of water dissolution. - will dissolve, and the alkalinity of the solution will increase rapidly, which will promote the dissolution of anhydrous calcium sulfate in fluorogypsum, Ca 2+ and SO 4 2- Entering the solution, it also promotes the destruction of the vitreous structure of a...

Embodiment 2

[0029] Fluorogypsum-based passivation agent ratio: based on 50% fluorogypsum, add 16% blast furnace manganese slag, 22% steel slag, 6% phosphorus tailings, 5.0% white mud and mix for 30-45 minutes. Add 1% admixture (15% carboxymethyl cellulose, 8% sodium dodecylbenzene sulfonate, 5% lauryl alcohol, 40% acetyl dodecylamine, 32% melamine compound), and then mix the mixture Grind in a ball mill for 40 minutes to prepare a fluorogypsum-based passivator.

[0030] The heavy metal content of a polluted farmland soil is shown in the following table. 980kg of passivating agent per mu is added to the polluted soil for restoration. Steel slag and white mud are dissolved in water to dissolve OH - will dissolve, and the alkalinity of the solution will increase rapidly, which will promote the dissolution of anhydrous calcium sulfate in fluorogypsum, Ca 2+ and SO 4 2- Entering the solution, it also promotes the destruction of the vitreous structure of a large number of silicon-aluminum mine...

Embodiment 3

[0034] Fluorogypsum-based passivation agent ratio: based on 45% fluorogypsum, add 20% blast furnace manganese slag, 18% steel slag, 10% phosphorous tailings, 4.0% white mud, mix and stir for 30-45 minutes, after 24 hours of stuffing Add 3% admixture (compounded by 20% carboxymethyl cellulose, 7% sodium dodecylbenzene sulfonate, 6% dodecyl alcohol, 33% acetyl dodecylamine, 34% melamine), and then mix The materials were pulverized in a ball mill for 40 minutes to prepare a fluorogypsum-based passivator.

[0035] The heavy metal content in the soil of a polluted farmland is shown in the table below. 850kg of passivating agent per mu is added to the contaminated soil for restoration. Steel slag and white mud are OH under the action of water dissolution. - will dissolve, and the alkalinity of the solution will increase rapidly, which will promote the dissolution of anhydrous calcium sulfate in fluorogypsum, Ca 2+ and SO 4 2- Entering the solution, it also promotes the destructio...

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Abstract

The invention provides a fluorgypsum-based passivator for heavy metal contaminated farmland soil. The preparation method comprises the following steps: with fluorgypsum as a basic raw material, addingblast furnace manganese slag, steel slag, white mud and phosphate tailing, mixing and stirring for 30 to 45 minutes, souring for 24 hours and adding an admixture; then feeding a mixture into a ball mill and grinding for 40 minutes to obtain the fluorgypsum-based passivator. The fluorgypsum-based passivator disclosed by the invention is applied to the heavy metal contaminated farmland soil. The fluorgypsum-based passivator disclosed by the invention is mixed with water to form slurry according to the mass ratio of the water to a solid being 0.65 in contaminated farmland solid per mu; the slurry is uniformly sprayed to the surface of the contaminated soil, and then is subjected to rotary tillage for at least 6 times to reach a deep bottom layer of the contaminated soil by using a rotary cultivator, so that the uniform mixing of the fluorgypsum-based passivator and the contaminated soil is ensured; finally, film covering is performed for sealing; after moisturizing and insulated maintenance are performed for not less than 14 days, the remediation effect is detected by sampling. The raw materials are mainly wastes and have no secondary pollution to the environment; in addition, the utilization rate of industrial waste residues such as the fluorgypsum is improved.

Description

technical field [0001] The patent of the present invention relates to a fluorogypsum-based passivator, which is mainly made of fluorogypsum, mixed with a certain proportion of ground blast furnace manganese slag, ground steel slag, phosphorus tailings, lime mud, additives, etc., and prepared by grinding and mixing. A fluorogypsum-based passivator that can efficiently remediate heavy metal-contaminated farmland soil. Background technique [0002] Soil heavy metal pollution refers to that the content of harmful heavy metal elements in the soil caused by human activities or natural activities exceeds the background value of the soil itself, and the content caused by excessive deposition is too high and accumulates to a certain extent, destroying the natural balance of the soil and causing soil pollution. Deterioration or decline in quality. Its pollution has a wide range, long time, concealment, stability, irreversibility, and non-biodegradability. It will not only cause serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 黄绪泉黄安宜赵小蓉姜明明聂丹丹
Owner CHINA THREE GORGES UNIV
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