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Heavy metal contaminated soil remediation material, preparation method thereof and heavy metal contaminated soil remediation method

A technology of polluted soil and remediation materials, applied in heavy metal contaminated soil remediation materials and its preparation, and the field of remediation of heavy metal contaminated soil

Inactive Publication Date: 2021-06-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The repair material provided by the invention can effectively prevent the problem of easy migration of various heavy metal pollutants in the aging process such as rainfall dry-wet cycle, and has long-term stable repair effect

Method used

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  • Heavy metal contaminated soil remediation material, preparation method thereof and heavy metal contaminated soil remediation method
  • Heavy metal contaminated soil remediation material, preparation method thereof and heavy metal contaminated soil remediation method
  • Heavy metal contaminated soil remediation material, preparation method thereof and heavy metal contaminated soil remediation method

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preparation example Construction

[0059] On the one hand, the present invention also provides a kind of preparation method of above-mentioned heavy metal polluted soil remediation material, and it comprises the following steps:

[0060] The Allosteric Extending Component, Deactivating Component and Long-Lasting Boosting Component are mixed.

[0061] In some embodiments, the method used to mix the allosteric extension component, the passivation component and the long-term promotion component includes but not limited to dry ball milling, ultrasonic dispersion, etc., and the mixing time is 30 minutes to 120 minutes.

[0062] In some embodiments, when the allosteric extension component is light-burned magnesite powder, before the step of mixing the allosteric extension component, the passivation component and the long-term promotion component, further comprising magnesite The ore powder is calcined at 800°C to 1050°C.

[0063] The main component of magnesite is MgCO 3 , mainly produces MgO after calcination. Di...

Embodiment 1

[0077] Preparation of Example 1 Heavy Metal Contaminated Soil Restoration Material

[0078] (1) Determination of calcination temperature of magnesite powder

[0079] The activity of MgO, the calcined product of magnesite powder, was confirmed according to the titration method. The specific method is: take 1g of magnesite powder at different calcination temperatures and add them to 80ml, 0.25mol / L acetic acid solution, use phenolphthalein as indicator, and the time when the solution turns from colorless to red is used as the standard for judging the activity of MgO . Depend on figure 2 It can be seen that the activity of MgO has an exponential relationship with the calcination temperature, and the specific calcination temperature and the activity of MgO are shown in Table 1. It can be seen that when the time for the solution to change from colorless to red is less than 500s, the activity of MgO is higher.

[0080] Table 1 Calcination temperature of magnesite powder and rea...

Embodiment 2

[0091] The preparation method of Example 2 is basically the same as that of Example 1, except that the preparation method of the allosteric extension component is as follows:

[0092] Take the MgO calcined at 950°C and put it at 350°C, and pass it with N 2 Thermal activation treatment in a muffle furnace for 2 h.

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Abstract

The invention relates to the technical field of soil remediation, in particular to a heavy metal contaminated soil remediation material, a preparation method thereof and a heavy metal contaminated soil remediation method. The heavy metal contaminated soil remediation material comprises a) a allosteric extension component and a passivation component in a weight ratio of (1: 10)-(10: 1), and b) a long-acting promotion component accounting for 0.1-5% of the mass of the component a), the allosteric extension component is selected from at least one of light calcined magnesite powder, hydrotalcite, sepiolite and attapulgite, and is anhydrous; the passivation component is selected from at least one of iron powder, magnetite and pyrolusite, and the surface of the passivation component is coated with phenolic substances containing plant sources; the long-acting promotion component is selected from at least one of blast furnace slag, steel slag and red mud. The material has good long-acting passivation efficiency. The invention further provides the preparation method of the remediation material and the heavy metal contaminated soil remediation method.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a heavy metal-contaminated soil remediation material, a preparation method thereof, and a method for remediation of heavy metal-contaminated soil. Background technique [0002] Soil pollution will seriously threaten the function of the ecosystem, food safety and human settlements, and soil pollution has the characteristics of concealment, hysteresis and accumulation. Therefore, compared with the pollution of other environmental media, soil pollution is more difficult to detect and treat. [0003] Heavy metals are the most prominent pollutants in soil, and it is imperative to control the pollution of heavy metals in soil scientifically. However, the causes of heavy metal pollution in soil are complex, and usually present the following characteristics: the coexistence of multiple heavy metal pollutants, and the large-scale distribution of concentrated patches seriously af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08
CPCB09C1/00B09C1/08C09K17/40
Inventor 侯德义王刘炜沈征涛
Owner TSINGHUA UNIV
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