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Soil conditioner and preparation thereof

A soil conditioner and ultrasonic treatment technology, applied in soil conditioning materials, other chemical processes, agriculture, etc., can solve the problems of reducing the activity and mobility of heavy metal ions, the limited consumption of alkali slag accumulation, and the easy reactivation of heavy metals. Achieve the effect of harmless and resourceful, ecological and environmental benefits and economic benefits, and improve the ability of water and fertilizer retention

Active Publication Date: 2022-04-22
中节能(连云港)清洁技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of practical application prospects, these schemes still have obvious deficiencies. The specific performance is that the main action of alkali slag is only to increase the pH value of the soil, so that heavy metal ions form insoluble precipitates such as hydroxides to reduce the activity of heavy metal ions. However, the independence of insoluble heavy metals is still very high at this time. When the soil is reacidified due to acid precipitation, leaching, etc., heavy metals are easily reactivated; alkali slag is not the main component of the conditioner. , the consumption is small, and the consumption of the stock of alkali slag is limited; the output of the secondary synthesis product is low, the alkali slag cannot be fully utilized, and there is a problem of secondary pollutant (filter residue) treatment; too much emphasis on the broad spectrum of applicable heavy metals Insufficient targeted research, efficiency needs to be improved

Method used

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  • Soil conditioner and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1. Water immersion dechlorination

[0034] Crush the alkali slag, sieve it through a 100-mesh sieve, then add it into water at a mass ratio of 1:3, carry out water immersion treatment at 40°C for 30 minutes under stirring conditions, stop stirring and let stand for 20 minutes, then filter to obtain dechlorinated alkali slag;

[0035] S2. Ultrasonic activation

[0036] Mix the dechlorinated alkali slag with 0.3M aqueous solution of EDTA-2Na at a mass ratio of 1:4 to prepare a slurry, stir and mix evenly and then ultrasonically treat for 12 minutes, the power of ultrasonic treatment is 540W, and the frequency is 80KHz;

[0037] S3. Hydrothermal treatment

[0038] Take rhamnolipid and SDS with a mass ratio of 3:1, mix and add water containing 10% ethanol to dissolve to form a solution with a total surfactant concentration of 0.5wt%;

[0039] Take the above solution, mix it with the ultrasonically treated slurry in step (2) at a volume ratio of 3:1, stir evenly, and then...

Embodiment 2

[0043] S1. Water immersion dechlorination

[0044] With embodiment 1;

[0045] S2. Ultrasonic activation

[0046] Mix the dechlorinated alkali slag with 0.3M aqueous solution of EDTA-2Na at a mass ratio of 1:4 to prepare a slurry, stir and mix evenly, and then ultrasonically treat for 15 minutes. The power of ultrasonic treatment is 400W, and the frequency is 80KHz;

[0047] S3. Hydrothermal treatment

[0048] Rhamnolipid and SDS were weighed with a mass ratio of 3.3:1, mixed and dissolved in water containing 8% ethanol to form a solution with a total surfactant concentration of 0.5 wt%.

[0049] Take the above solution, mix it with the ultrasonically treated slurry in step (2) at a volume ratio of 3:1, stir evenly, and then transfer it into a high-pressure reactor with a filling volume of 80% of the volume, seal it and react at 130°C for 7 hours ;

[0050] S4. Post-processing

[0051]After the reaction, the autoclave was cooled to room temperature, filtered, washed three...

Embodiment 3

[0053] S1. Water immersion dechlorination

[0054] With embodiment 1;

[0055] S2. Ultrasonic activation

[0056] Mix the dechlorinated alkali slag with 0.3M aqueous solution of EDTA-2Na at a mass ratio of 1:4 to prepare a slurry, stir and mix evenly and then ultrasonically treat for 20 minutes, the power of ultrasonic treatment is 200W, and the frequency is 60KHz;

[0057] S3. Hydrothermal treatment

[0058] Weigh rhamnolipid and SDS with a mass ratio of 4:1, mix and dissolve in water containing 5% ethanol to form a solution with a total surfactant concentration of 0.5% by weight;

[0059] Take the above solution and mix it with the ultrasonically treated slurry in step (2) at a ratio of 3:1 by volume. After stirring evenly, move it into a high-pressure reactor with a filling volume of 80% of the volume. After sealing, react at 140°C for 6 hours ;

[0060] S4. Post-processing

[0061] After the reaction, the autoclave was cooled to room temperature, filtered, washed thre...

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Abstract

According to the soil conditioner disclosed by the invention, alkaline residues are used as raw materials, dechlorination, ultrasonic activation and hydro-thermal treatment are sequentially carried out, and the prepared conditioner has excellent remediation performance on heavy metal contaminated soil, is high in Pb and As removal efficiency, and can remarkably increase the granular structure of the soil and improve the volume weight of the soil.

Description

technical field [0001] The invention belongs to the field of soil conditioners, and in particular relates to a soil conditioner and a preparation method thereof. Background technique [0002] Under the influence of pesticides, wastewater, sludge and atmospheric deposition, soil heavy metal pollution in my country has become increasingly serious, which has become a major obstacle to the sustainable development of the ecological environment and agriculture and forestry. Heavy metal pollution in the soil is not easily leached with water, cannot be decomposed by soil microorganisms, and will gradually accumulate in the soil environment, and even some heavy metal elements can be converted into more toxic methyl compounds, or pass through the food chain in harmful concentrations in humans Accumulation in the body will seriously endanger human health. The treatment of heavy metal pollution in soil is of great significance, but it is currently facing problems such as limited means,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 李杰丁勇陈艳王静郑云龙张建宁
Owner 中节能(连云港)清洁技术发展有限公司
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