Soil conditioner based on harmless and resourceful treatment of alkali residue and its preparation

A soil conditioner, a harmless technology, applied in soil conditioning materials, chemical instruments and methods, and other chemical processes, etc., can solve the problem of reducing the activity and mobility of heavy metal ions, limited consumption of alkali residues, and easy reuse of heavy metals. Activation and other issues, to achieve the effect of achieving harmlessness and resource utilization, significant ecological and environmental benefits and economic benefits, and improving the ability to retain water and fertilizer

Active Publication Date: 2022-07-19
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 based on harmless and resourceful treatment of alkali residue and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1. Water leaching dechlorination

[0034] The alkali residue is pulverized, sieved with 100 meshes, then added to water in a mass ratio of 1:3, and subjected to water immersion treatment at 40° C. under stirring conditions for 30 minutes, stopped stirring and allowed to stand for 20 minutes and then filtered to obtain dechlorinated alkali residue;

[0035] S2. Ultrasonic activation

[0036] The dechlorination alkali residue and the aqueous solution with the EDTA-2Na concentration of 0.3M are mixed and prepared into a slurry at a mass ratio of 1:4, and then ultrasonically treated for 12 minutes after stirring and mixing. The ultrasonic treatment power is 540W, and the frequency is 80KHz;

[0037] S3. Hydrothermal treatment

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

[0039] Take the above solution, mix it with the sonicated slurr...

Embodiment 2

[0043] S1. Water leaching dechlorination

[0044] With embodiment 1;

[0045] S2. Ultrasonic activation

[0046] The dechlorination alkali residue and the aqueous solution with EDTA-2Na concentration of 0.3M are mixed and prepared into a slurry at a mass ratio of 1:4, and after stirring and mixing evenly, ultrasonically treated for 15 minutes, the power of ultrasonic treatment is 400W, and the frequency is 80KHz;

[0047] S3. Hydrothermal treatment

[0048] Weigh rhamnolipid and SDS in a mass ratio of 3.3:1, add them into water containing 8% ethanol to dissolve, and form a solution with a total surfactant concentration of 0.5wt%;

[0049] Take the above solution, mix it with the sonicated slurry in step (2) at a volume ratio of 3:1, stir evenly, transfer it into an autoclave, fill 80% of the volume, and react at 130° C. for 7 hours after sealing. ;

[0050] S4. Post-processing

[0051]The reacted autoclave was cooled to room temperature, filtered, washed with water three ...

Embodiment 3

[0053] S1. Water leaching dechlorination

[0054] With embodiment 1;

[0055] S2. Ultrasonic activation

[0056] The dechlorination alkali residue and the aqueous solution with the EDTA-2Na concentration of 0.3M are mixed and prepared into a slurry at a mass ratio of 1:4, and then ultrasonically treated for 20 minutes after stirring and mixing, and the power of the ultrasonic treatment is 200W and the frequency is 60KHz;

[0057] S3. Hydrothermal treatment

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

[0059] Take the above solution, mix it with the sonicated slurry in step (2) at a volume ratio of 3:1, stir evenly, transfer it into an autoclave, fill 80% of the volume, and react at 140° C. for 6 hours after sealing. ;

[0060] S4. Post-processing

[0061] The reacted autoclave was cooled to room temperature, filtered, washed with water...

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Abstract

The invention discloses a soil conditioner, which takes alkali residue as a raw material and is sequentially subjected to dechlorination, ultrasonic activation and hydrothermal treatment. The prepared conditioner has excellent remediation performance for heavy metal polluted soil, high removal efficiency of Pb and As, and It can significantly increase soil aggregate structure and improve soil bulk density.

Description

technical field [0001] The invention belongs to the field of soil conditioners, and in particular relates to a soil conditioner based on the harmless and resourceful treatment of alkali residues and a preparation method thereof. Background technique [0002] Under the influence of factors such as pesticides, waste water, 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 ecological environment and agriculture and forestry. Heavy metal pollution is not easy to be leached with water in the soil, 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 through the food chain at harmful concentrations in humans. Accumulation in the body can seriously endanger human health. The control of heavy metal pollution in soil is of g...

Claims

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Application Information

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Patent Type & Authority Patents(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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