Preparation method of soil heavy metal passivant, and soil Pb passivation method

A heavy metal passivator and soil technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., to achieve the effect of improving soil physical and chemical properties, low cost, and good safety

Inactive Publication Date: 2012-10-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be considered that straw powder / fly ash / synthetic zeolite powder / rice husk ash is a kind of mixture system with good physical and chemical properties, and it has not been reported to use it in the passivation research of Pb pollution in loess farmland soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of soil heavy metal passivator, comprising the following steps,

[0028] In the first step, the fly ash is passed through a 1mm sieve, and the NaOH solution with a concentration of 1mol / L and the fly ash are added to the reactor at a volume-to-mass ratio of 5mL / g and ultrasonically dispersed for 10 minutes and stirred into a slurry;

[0029] In the second step, the reaction kettle was placed in a 100°C oven for hydrothermal crystallization reaction for 6 hours;

[0030] The third step is to naturally cool the reacted zeolite product, centrifuge it at 5000r / min for 5min, wash it with deionized water until the pH is about 8~9, dry it at 60°C for 24h, and grind it into zeolite powder;

[0031] The fourth step is to mix straw powder, fly ash, and synthetic zeolite powder according to weight percentage, including straw powder 20%, fly ash 40%, and synthetic zeolite powder 40%, fully stir, and mix evenly to obtain a heavy metal passivator .

[0032] Usi...

Embodiment 2

[0036] A preparation method of soil heavy metal passivator, comprising the following steps,

[0037] In the first step, the fly ash is passed through a 1mm sieve, and the NaOH solution with a concentration of 1mol / L and the fly ash are added to the reactor at a volume-to-mass ratio of 10mL / g and ultrasonically dispersed for 10 minutes and stirred into a slurry;

[0038] In the second step, the reaction kettle was placed in a 150°C oven for hydrothermal crystallization reaction for 6 hours;

[0039] The third step is to naturally cool the reacted zeolite product, centrifuge it at 5000r / min for 5min, wash it with deionized water until the pH is about 8~9, dry it at 60°C for 24h, and grind it into zeolite powder;

[0040] The fourth step is to mix straw powder, fly ash, and synthetic zeolite powder according to weight percentage, including 30% straw powder, 35% fly ash, and 35% synthetic zeolite powder, stir well, and mix evenly to obtain a heavy metal passivator ;

[0041] Usi...

Embodiment 3

[0044] A preparation method of soil heavy metal passivator, comprising the following steps,

[0045] In the first step, the fly ash is passed through a 1mm sieve, and the NaOH solution with a concentration of 1mol / L and the fly ash are added to the reactor at a volume-to-mass ratio of 15mL / g and ultrasonically dispersed for 10 minutes and stirred into a slurry;

[0046] In the second step, the reaction kettle was placed in a 200°C oven for hydrothermal crystallization reaction for 6 hours;

[0047] The third step is to naturally cool the reacted zeolite product, centrifuge it at 5000r / min for 5min, wash it with deionized water until the pH is about 8~9, dry it at 60°C for 24h, and grind it into zeolite powder;

[0048]The fourth step is to mix straw powder, fly ash, and synthetic zeolite powder according to weight percentage, including 40% straw powder, 30% fly ash, and 30% synthetic zeolite powder. Stir thoroughly and mix evenly to obtain a heavy metal passivator .

[0049]...

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PUM

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Abstract

The invention relates to a preparation method of a soil heavy metal passivant, and a soil Pb passivation method. The preparation method comprises the following steps: 1, adding an alkaline solution and sieved coal ash to a reaction vessel in proportion, carrying out ultrasonic dispersion stirring to obtain a slurry, and carrying out a hydrothermal crystallization reaction through putting the reaction vessel in an oven; and 2, cooling and centrifuging products obtained after the reaction, washing the products with deionized water, drying, grinding to obtain synthetic zeolite powder, burning rice husk at normal pressure to prepare rice husk ash, and uniformly mixing straw powder, the coal ash, the synthetic zeolite powder and the rice husk ash according to weight percentages to obtain the heavy metal passivant. The loess farmland soil Pb passivation effect can be improved through adjusting conditions comprising the soil pH value, the soil water content, the passivant quality, the passivation time, the passivation temperature and the like. The passivation method has the advantages of low cost, simple operation, strong practicality, good safety, and easy popularization, can passivate soil heavy metals and also can improve the soil properties, so the passivation method has potential application values in soil heavy metal pollution restoration.

Description

technical field [0001] The invention relates to a passivation method for soil heavy metals, in particular to the preparation of a soil heavy metal passivator and the passivation method for soil Pb. Background technique [0002] Soil is an important part of the ecological environment system and the material basis for human survival and development. Heavy metal Pb is a class of pollutants in the soil, which mainly comes from man-made pollution, including sewage irrigation, waste gas deposition, mining, and the use of pesticides and fertilizers. The background value of Pb in soil in my country is 26.0±12.4mg / kg, and the Pb content in soil fluctuates between 2-200mg / kg. With the development of industry, soil Pb pollution is becoming more and more serious. Pb is a non-degradable pollutant with "three effects", and its excessive existence will seriously affect the quality of life of organisms. For example, the stress of Pb can affect the absorption of mineral nutrients and water...

Claims

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Application Information

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IPC IPC(8): C09K17/02B09C1/08C09K101/00
Inventor 范春辉
Owner SHAANXI UNIV OF SCI & TECH
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