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Preparation method of soil heavy metal compound passivator

A technology of heavy metals and passivators, applied in the field of soil treatment, can solve the problems of affecting soil fertility, damage to soil properties, and unsustainable passivation, achieving broad application prospects, improving physical properties, and reducing losses.

Inactive Publication Date: 2017-12-01
郭迎庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problem that traditional passivators affect the fertility of soil, cause great damage to soil properties, and the passivation effect is not durable, a preparation method of soil heavy metal composite passivator is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Weigh 200g of attapulgite, place it in a drying oven, and dry it to constant weight at 110°C, then put it into a pulverizer and pulverize it, and pass through a 200-mesh sieve to obtain attapulgite powder after sieving. Add the sieved attapulgite powder to 250mL dimethylformamide, stir at 400r / min for 15min, then add 500mL thioglycolic acid, 2.4g sodium bisulfate, and heat to 130°C, keep stirring for 3h to obtain a reaction solution; Add 600g of sodium sulfide to the reaction solution, 2.4L of 95% ethanol solution by mass fraction, heat the reaction at 130°C for 2h, cool to room temperature and filter, wash the filter residue with deionized water for 5 times, then place the washed filter residue in In a vacuum drying oven, dry to constant weight at 110°C, then transfer to a mortar and grind, pass through a 200-mesh sieve to obtain modified attapulgite powder, and set aside; take 900g of phosphate rock powder with a total phosphorus content of 30%, Put it into a pulveriz...

example 2

[0026] Weigh 180g of attapulgite, place it in a drying oven, and dry it to constant weight at 105°C, then put it into a pulverizer and pulverize it, and pass through a 200-mesh sieve to obtain attapulgite powder after sieving. Add the sieved attapulgite powder into 125mL of dimethylformamide, stir at 300r / min for 10min, then add 250mL of thioglycolic acid, 1.2g of sodium bisulfate, and heat to 120°C, keep stirring for 2h to obtain a reaction solution; Add 300g of sodium sulfide to the reaction solution, 1.2L of 95% ethanol solution by mass fraction, heat the reaction at 120°C for 1h, cool to room temperature and filter, wash the filter residue with deionized water for 3 times, then place the washed filter residue in In a vacuum drying oven, dry to constant weight at 105°C, then transfer to a mortar and grind, pass through a 200-mesh sieve to obtain modified attapulgite powder, and set aside; take 800g of phosphate rock powder with a total phosphorus content of 25%, Put it into...

example 3

[0029] Weigh 190g of attapulgite, place it in a drying oven, and dry it to constant weight at 107°C, then put it into a pulverizer and pulverize it, and pass through a 200-mesh sieve to obtain attapulgite powder after sieving. Add the sieved attapulgite powder to 200mL dimethylformamide, stir at 350r / min for 12min, then add 400mL thioglycolic acid, 2.1g sodium bisulfate, and heat to 125°C, keep stirring for 2h to obtain a reaction solution; Add 400g of sodium sulfide to the reaction solution, 2.1L of 95% ethanol solution by mass fraction, insulate and react at 125°C for 2h, cool to room temperature and filter, wash the filter residue 4 times with deionized water, then place the washed filter residue in In a vacuum drying oven, dry to constant weight at 107°C, then transfer to a mortar and grind, pass through a 200-mesh sieve to obtain modified attapulgite powder, and set aside; take 850g of phosphate rock powder with a total phosphorus content of 27%, Put it into a pulverizer ...

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Abstract

The invention belongs to the technical field of soil treatment, and particularly relates to a preparation method of a soil heavy metal compound passivator. The preparation method of the invention comprises the steps of taking attapulgite as a raw material and using thioglycolic acid modified attapulgite as a carrier of fertilizer to improve the physical properties of the fertilizer, reduce the nutrient loss of the fertilizer, improve the utilization rate of the fertilizer, enhance the buffering performance of soil, and adsorb harmful elements in the soil, and repair soil heavy metal pollution; then crushing and sieving ground phosphate rock, and mixing with dried and crushed oyster mushroom spawn culture media waste to obtain slow-release compound fertilizer; finally mixing a homemade fulvic acid solution, the modified attapulgite powder and the compound fertilizer for granulation, so as to obtain the soil heavy metal compound passivator. The heavy metal compound passivator prepared by the preparation method of the invention cannot change the physical properties of the soil and can improve the fertility of the soil, meanwhile, the passivation effect is long-lasting and a broad application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of soil treatment, and in particular relates to a preparation method of a soil heavy metal composite passivator. Background technique [0002] Soil heavy metal pollution is concealed, latent, accumulative and long-term, among which the more serious elements are mainly Pb, Cd and other elements. Soil heavy metal pollution will first affect the growth and development of plants, and then affect the yield and quality of crops. Finally, it will be enriched in human and animal bodies through the food chain, endangering the health of humans and animals, and causing cancer and other diseases. Therefore, it is extremely important to effectively control soil heavy metal pollution and reduce its harm for sustainable development. [0003] The in-situ passivation remediation method can better meet the requirements of heavy metal pollution control in soil in terms of cost and time. In-situ passivation is to adjust and c...

Claims

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Application Information

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IPC IPC(8): C09K17/40C05G3/00C05G3/04B09C1/08C09K101/00C05G3/80
CPCB09C1/08B09C2101/00C05B17/00C05G3/00C05G3/80C09K17/40C09K2101/00C05F5/00C05F11/02
Inventor 郭迎庆薛洋杨阳
Owner 郭迎庆
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