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Preparation method of organic-inorganic composite heavy metal polluted soil passivation agent

A soil-contaminated and composite technology is applied in the field of preparation of heavy metal-contaminated soil passivators, which can solve the problems of crop yield and quality hazards, health hazards, etc., and achieve the effects of low price, stable product performance, and mild reaction conditions.

Active Publication Date: 2018-08-07
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, heavy metals are non-degradable, which not only cause great harm to the yield and quality of crops, but also accumulate continuously through the food chain, and eventually accumulate in the human body and endanger health

Method used

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  • Preparation method of organic-inorganic composite heavy metal polluted soil passivation agent
  • Preparation method of organic-inorganic composite heavy metal polluted soil passivation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, its preparation method is:

[0024] (1) Place the bentonite that has passed through a 100-mesh sieve in an oven, bake at 105°C for 10 hours, seal and store after drying, and set aside;

[0025] (2) Take the above 10g of dried bentonite, add water to make a suspension with a liquid-solid ratio of 100mL: 5g, and stir for 0.5 hours;

[0026] (3) Add 0.5 g of sodium carbonate to the above suspension, and stir and react at 70° C. for 2 hours;

[0027] (4) Add 0.5g lignin, and continue to stir and react at 75°C for 3 hours;

[0028] (5) After the reaction, cool to room temperature 25°C, filter with suction, wash with deionized water until the pH value is 7.0, dry at 60°C for 24 hours, grind, and pass through a 100-mesh sieve to obtain the passivating agent of the present invention .

Embodiment 2

[0029] Embodiment 2, its preparation method is:

[0030] (1) Place the bentonite that has passed through a 100-mesh sieve in an oven, bake at 105°C for 10 hours, seal and store after drying, and set aside;

[0031] (2) Take the above 10g of dried bentonite, add water to make a suspension with a liquid-solid ratio of 100mL:2g, and stir for 0.5 hours;

[0032] (3) Add 0.5 g of sodium carbonate to the above suspension, and stir and react at 70° C. for 2 hours;

[0033] (4) Add 0.25g of aminated lignin and 0.25g of sodium humate, and continue to stir and react at 45°C for 1 hour;

[0034] (5) After the reaction, cool to room temperature 25°C, filter with suction, wash with deionized water until the pH value is 7.0, dry at 60°C for 24 hours, grind, and pass through a 100-mesh sieve to obtain the passivating agent of the present invention .

Embodiment 3

[0035] Embodiment 3, its preparation method is:

[0036] (1) Place the bentonite that has passed through a 100-mesh sieve in an oven, bake at 105°C for 10 hours, seal and store after drying, and set aside;

[0037] (2) Take the above 10g of dried bentonite, add water to form a suspension with a liquid-solid ratio of 100mL: 10g, and stir for 0.5 hours;

[0038] (3) Add 0.5 g of sodium carbonate to the above suspension, and stir and react at 70° C. for 2 hours;

[0039] (4) Add 2g of aminated lignin, and continue to stir and react at 90°C for 7 hours;

[0040] (5) After the reaction, cool to room temperature 25°C, filter with suction, wash with deionized water until the pH value is 7.0, dry at 60°C for 24 hours, grind, and pass through a 100-mesh sieve to obtain the passivating agent of the present invention .

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Abstract

The invention discloses a preparation method of an organic-inorganic composite heavy metal contaminated soil passivator. The preparation method includes the following steps that 1, bentonite is put into a drying oven and dried for 10 hours at the temperature of 105 DEG C for usage; 2, the dried bentonite is weighed, water is added into the dried bentonite so that turbid liquid can be prepared, wherein the ratio of liquid to solid is 100 mL:2-10 g, and stirring is carried out for 0.5 hour; 3, sodium carbonate is added into the turbid liquid, and the mixture is subjected to a stirring reaction for 2 hours at the temperature of 70 DEG C; 4, a modifier is added, and the mixture continues to be subjected to a stirring reaction for 1-10 hours at the temperature of 30-90 DEG C; 5, after the reaction is ended, the mixture is cooled to room temperature, subjected to suction filtration and washed with deionized water till the pH value is 7.0, drying is carried out for 24 hours at the temperature of 60 DEG C, and the passivator finished product is obtained after grinding and 100-mesh sieving. The passivator has the advantages that the source of raw materials is wide, and the passivator is low in price, natural and free of contamination; the preparation method is simple, reaction conditions are mild, product performance is stable, and the passivator has a good effect on passivated repair of heavy metal contaminated soil and can be applied to repairing of large-area composite heavy metal contaminated soil.

Description

technical field [0001] The invention relates to a preparation method of a heavy metal-polluted soil passivator, which belongs to the field of soil heavy metal pollution control in environmental protection, and specifically relates to a preparation method of an organic-inorganic compound heavy metal-polluted soil passivator. Background technique [0002] However, with the development of industry and agriculture, the problem of soil pollution has become increasingly serious, seriously affecting the development of the national economy. Data show that the agricultural land area polluted by heavy metals in my country is about 25 million m 2 Every year, as many as 12 million tons of grain are polluted by heavy metals, and the reduction in grain production due to heavy metal pollution is as high as more than 10 million tons, with a total economic loss of at least 20 billion yuan. At the same time, heavy metals are non-degradable, which not only cause great harm to the yield and qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 宋海农杨崎峰周永信林宏飞陈国宁蒋林伶梁小双薛天利
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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