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Preparation method for alkali-chelated palygorskite-based heavy metal passivation material

A heavy metal, palygorskite technology, applied in chemical instruments and methods, soil conditioning materials, organic fertilizers and other directions, can solve the problems of increasing, limited use of palygorskite, increasing the amount of palygorskite, etc., to facilitate crushing Effect

Inactive Publication Date: 2017-06-27
LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing palygorskite-based heavy metal passivation materials are only crushed, mixed, and directly put into use after simple modification treatment. The actual use effect of palygorskite is limited. In order to achieve the purpose of soil pollution restoration, it is necessary to continuously increase the amount of palygorskite. Lead to increased waste and consumption of palygorskite

Method used

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  • Preparation method for alkali-chelated palygorskite-based heavy metal passivation material
  • Preparation method for alkali-chelated palygorskite-based heavy metal passivation material
  • Preparation method for alkali-chelated palygorskite-based heavy metal passivation material

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preparation example Construction

[0026] A preparation method of an alkali-chelated palygorskite-based heavy metal passivation material, comprising the steps of:

[0027] A. to dry naturally

[0028] The palygorskite ore is dried in the sun for 3-7 days to prevent rainwater from soaking the palygorskite;

[0029] B. Crushed and sieved

[0030] The palygorskite ore is crushed into palygorskite clay, and the palygorskite clay is sieved with a filter mesh of 150-200 mesh;

[0031] C. Alkaline chelation

[0032] Mix the palygorskite clay with the quicklime solution and stir to make it evenly mixed;

[0033] D. Precipitation, drying and crushing

[0034] The mixed solution is allowed to stand for precipitation, and the precipitate is dried and crushed to obtain the finished product.

[0035] In the preferred step C, palygorskite clay and quicklime are mixed in a weight ratio of 1:1 to 7:1, quicklime is mixed with water to prepare a quicklime solution, and palygorskite clay is added to the quicklime solution, a...

Embodiment 1

[0041] A preparation method of an alkali-chelated palygorskite-based heavy metal passivation material, comprising the steps of:

[0042] A. to dry naturally

[0043] The palygorskite ore is dried in the sun for 3-7 days to prevent rainwater from soaking the palygorskite;

[0044] B. Crushed and sieved

[0045] The palygorskite ore is crushed into palygorskite clay, and the palygorskite clay is sieved with a filter mesh of 150-200 mesh;

[0046] C. Alkaline chelation

[0047] Palygorskite clay and quicklime are mixed in a weight ratio of 1:1~7:1, quicklime and water are mixed to prepare a quicklime solution, and palygorskite clay is added to the quicklime solution, and stirred at a stirring speed of 500 r / min for 12~108h, make it evenly mixed;

[0048] D. Precipitation, drying and crushing

[0049] The mixed solution is allowed to stand for precipitation, and the precipitate is dried and crushed to obtain the finished product.

Embodiment 2

[0051] A preparation method of an alkali-chelated palygorskite-based heavy metal passivation material, comprising the steps of:

[0052] A. to dry naturally

[0053] The palygorskite ore is dried in the sun for 3-7 days to prevent rainwater from soaking the palygorskite;

[0054] B. Crushed and sieved

[0055] The palygorskite ore is crushed into palygorskite clay, and the palygorskite clay is sieved with a filter mesh of 150-200 mesh;

[0056] C. Alkaline chelation

[0057] Palygorskite clay and quicklime are mixed in a weight ratio of 3:1~4:1, quicklime and water are mixed to prepare a quicklime solution, and palygorskite clay is added to the quicklime solution, and stirred for 72 hours at a stirring speed of 500 r / min to make it Mix evenly Mix the palygorskite clay with the quicklime solution and stir to make it evenly mixed;

[0058] D. Precipitation, drying and crushing

[0059] The mixed solution is allowed to stand for precipitation, and the precipitate is dried and ...

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Abstract

The invention relates to the technical field of environmental protection materials and preparation thereof, in particular to a preparation method of an alkali chelated palygorskite-based heavy metal passivation material. By modifying the heavy metal passivation material of palygorskite by alkali chelation, the passivation and adsorption performance of palygorskite have been greatly improved, which can passivate organic pollutants and toxic and harmful heavy metals, and reduce the biological effect of soil pollutants. Toxicity and mobility, reducing the bioavailability of heavy metals. Some of the heavy metals in the soil are in the form of cations. This part of the heavy metals has high mobility, high bioavailability, and the greatest harm. The application of quicklime can increase the pH value of the soil, and the negative charge on the surface of the soil particles increases, which promotes the formation of some heavy metals in the soil. The hydroxide precipitates and contributes to the stability of heavy metals, while enhancing the adsorption of palygorskite to heavy metals.

Description

technical field [0001] The invention relates to the technical field of environment-friendly materials and their preparation, in particular to a method for preparing an alkali-chelated palygorskite-based heavy metal passivation material. Background technique [0002] With the rapid growth of industry and agriculture, the problem of heavy metal pollution in soil is becoming more and more serious, and the problem of heavy metal pollution in soil is becoming more and more prominent in our country. According to reports from the State Environmental Protection Administration and the Ministry of Land and Resources, the overall state of the soil environment in the country is not optimistic. The soil pollution in some areas is serious. Inorganic type is the main type, and the number of points exceeding the standard of inorganic pollutants accounts for 82.8% of all points exceeding the standard. The area of ​​sewage irrigation area in my country is about 1.4 million hm 2 , the land a...

Claims

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Application Information

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IPC IPC(8): B02C21/00B09C1/08C09K17/40
CPCB02C21/00B09C1/08C09K17/40
Inventor 任珺陶玲闫洁颜子皓孙梦洁
Owner LANZHOU KUNLUN ENVIRONMENTAL PROTECTION TECH
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