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Solidified heavy metal remover and preparation method

A technology for removing agents and heavy metals, which is applied in the field of contaminated soil treatment and restoration, to achieve low prices, restore removal effects, and facilitate recycling

Inactive Publication Date: 2019-01-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This remover can remediate heavy metal-contaminated soil in situ without affecting soil quality

Method used

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  • Solidified heavy metal remover and preparation method

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Effect test

Embodiment 1

[0032] This embodiment provides a solidification type heavy metal remover, comprising the following components, the mass percent of each component is:

[0033] Adsorption active material is 20% of natural zeolite powder,

[0034] The pore forming agent is ammonium carbonate 0.5%,

[0035] The coagulant is Portland cement 79.5%.

[0036] Its preparation method is:

[0037] 1) Dissolve ammonium carbonate in deionized water to form an ammonium carbonate solution, then add natural zeolite powder and Portland cement to the mixed powder uniformly mixed according to the above mass percentage, knead and extrude into a 1cm diameter and height Cylinder particles, pour water every 12 hours at room temperature, let the cylinder particles solidify naturally for 10 days to achieve the required mechanical strength, and obtain ordinary solidified heavy metal remover;

[0038] 2), put the ordinary coagulation-type heavy metal remover obtained in step 1) in a 20% by volume hydrochloric acid ...

Embodiment 2

[0040] This embodiment provides a solidification type heavy metal remover, comprising the following components, the mass percent of each component is:

[0041] The adsorption active material is an active adsorption material rich in amino groups synthesized by silica powder and 3-aminopropyltriethoxysilane through hydrothermal synthesis method 20%

[0042] The pore forming agent is ammonium carbonate 0.5%,

[0043] The coagulant is Portland cement 79.5%.

[0044] Its preparation method is:

[0045] 1) Dissolving ammonium carbonate in deionized water to form an ammonium carbonate solution, and then adding it to silica powder and 3-aminopropyltriethoxysilane through hydrothermal synthesis of active adsorption materials rich in amino groups and silicon Salt cement is uniformly mixed according to the above mass percentage, kneaded and extruded into cylindrical particles with a diameter and height of 1cm, poured water every 12 hours at room temperature, and let the cylindrical par...

Embodiment 3

[0048] This embodiment provides a solidification type heavy metal remover, comprising the following components, the mass percent of each component is:

[0049] Adsorption active material is chitosan 2% and natural zeolite powder 16%,

[0050] The pore-forming agent is ammonium bicarbonate 2%,

[0051] The coagulant is Portland cement 80%.

[0052] Its preparation method is:

[0053] 1) Dissolve ammonium bicarbonate in deionized water to form ammonium bicarbonate solution, then add chitosan, natural zeolite powder and Portland cement to the mixed powder uniformly mixed according to the above mass percentage, knead and extrude into a diameter and cylindrical particles with a height of 1 cm, pour water every 12 hours at room temperature, let the cylindrical particles naturally solidify for 10 days to achieve the required mechanical strength, and obtain a common solidified heavy metal remover;

[0054] 2), put the ordinary coagulation-type heavy metal remover obtained in step 1...

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Abstract

The invention relates to a solidified heavy metal remover and a preparation method. The solidified heavy metal remover comprises the following components in percentage by mass: 10-30% of an adsorbentactive material, 0.5-5% of a pore forming agent, and 69.5-89.5% of a coagulant. A pore forming agent solution of the pore forming agent is added to mixed powder of the adsorbent active material and the coagulant according to the mass percentage, the mixture is kneaded and extruded into granules, and the granules are solidified to obtain a common solidified heavy metal remover; and the obtained common solidified heavy metalremover is ultrasonically treated in an acid solution, washed and dried to obtain an acidified solidified heavy metal remover. The soil heavy metal remover has relatively high mechanical strength and good adsorption effect, can be recycled, belongs to in-situ repair and has little influence on soil; and the heavy metal remover can adsorb heavy metals in soil in situ, andcan also be applied to the removal of heavy metals in sewer sludge, river, pond and lake sediments and wastewater.

Description

technical field [0001] The invention relates to the technical field of contaminated soil treatment and restoration, and proposes a solidified heavy metal remover and a preparation method; in particular, it relates to a recyclable solidified heavy metal remover formed by the coagulation of the coagulant and a preparation method thereof. Background technique [0002] Soil pollution caused by excessive deposition of heavy metals in the soil will not only cause physiological dysfunction and malnutrition of plants in the soil, but also affect the normal survival of soil animals and microorganisms, resulting in soil degradation and weakened soil value functions. Heavy metals are highly toxic, have weak mobility in soil, and cannot be degraded by microorganisms. Therefore, it is difficult to eliminate heavy metal pollution by relying on the soil itself. In addition, heavy metals can easily accumulate in animals, plants and humans through the food chain, posing a serious threat to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40C02F1/62C02F11/00C02F101/20
CPCB09C1/08C02F1/62C02F11/004C02F2101/20C09K17/40
Inventor 马德刚蔡觅
Owner TIANJIN UNIV
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