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Clay-based heavy metal thermal curing agent and its method for curing heaving metal

A technology of thermal curing agent and heavy metal, applied in the field of soil pollution remediation, can solve the problems of few heavy metal detoxification studies, short stabilization time, high cost of curing agent, and achieve the effect of optimistic industrialization prospect, wide application prospect and good stabilization effect.

Active Publication Date: 2012-09-12
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The solidification and detoxification of heavy metals has always been a difficult research point, especially for the detoxification of heavy metals in heavy metal-contaminated soil in industrial sites.
The currently reported heavy metal stabilization and curing technology has the characteristics of high curing agent cost, low stabilization and curing efficiency, and short stabilization time. Under certain conditions, such as high temperature or rain washing, heavy metals will re-volatize or leach out, and cannot be recycled as recycled materials. use

Method used

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  • Clay-based heavy metal thermal curing agent and its method for curing heaving metal
  • Clay-based heavy metal thermal curing agent and its method for curing heaving metal
  • Clay-based heavy metal thermal curing agent and its method for curing heaving metal

Examples

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Effect test

Embodiment 1

[0042] Example 1: Clay-based heavy metal thermal curing agent and its curing application and curing effect evaluation on a single heavy metal

[0043] The heavy metal thermosetting agent based on clay of the present embodiment, its component and content are as follows, by total mass fraction 100%, comprise clay (mullite powder) 40%, iron oxide 15%, fly ash 20% and stone powder 25% %. The above components are mixed evenly according to their contents to obtain the clay-based heavy metal thermosetting agent.

[0044] The single heavy metal is Cu.

[0045] The heavy metal thermosetting agent based on clay of the present embodiment comprises the following steps to the curing method and curing effect evaluation of heavy metals:

[0046] (1) CuO is mixed with the heavy metal thermosetting agent based on clay respectively in different ratios of mass ratio 1: 1, 1: 5, 1: 10, 1: 15 and 1: 20;

[0047] (2) Rotate and mix samples with different mass ratios in a mixer for 2 hours;

[0...

Embodiment 2

[0053] Example 2: Application of clay-based heavy metal thermal curing agent to thermal curing of mixed heavy metals and evaluation of curing effect

[0054] The heavy metal thermosetting agent based on clay of the present embodiment, its component and content are as follows: by mass fraction 100%, clay 40% (bentonite 10%, kaolin 10%, mullite powder 10%, illite powder 10%), Iron oxide 15%, fly ash 30% and stone powder 15%. The above components are mixed evenly according to their contents to obtain the clay-based heavy metal thermosetting agent.

[0055] The mixed heavy metals are seven kinds of Pb, Zn, Ni, Cd, Cu, Hg and Mg, and the heavy metals are in the form of oxides. In this embodiment, the mixed heavy metals are composed in the same mass ratio.

[0056] The heavy metal thermosetting agent based on clay of the present embodiment comprises the following steps to the curing method and curing effect evaluation of heavy metals:

[0057] (1) mixing heavy metals with clay-bas...

Embodiment 3

[0062] Example 3: Application of clay-based heavy metal thermal curing agent to thermal curing of heavy metals in heavy metal-contaminated soil at electronic waste dismantling site and evaluation of curing effect

[0063] The clay-based heavy metal thermal curing agent of this embodiment has the following components and contents: based on 100% by mass fraction, 60% of kaolin, 5% of iron oxide, 20% of fly ash and 15% of stone powder. The above components are mixed evenly according to their contents to obtain the clay-based heavy metal thermosetting agent.

[0064] The heavy metal-contaminated soil at the e-waste dismantling site described in this example is the soil at an e-waste dismantling site in Longtang Town, Qingyuan City. After the soil was collected, it was digested with strong acid and analyzed by ICP-AES. The heavy metal components were as follows: Cr 56.17mg / kg, Ni 29.22mg / kg, Pb 8161.31mg / kg, Cd 0.94mg / kg, Hg 232.38mg / kg, Cu 511.59mg / kg.

[0065] The thermal curing...

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Abstract

The invention discloses a clay-based heavy metal thermal curing agent and its method for curing heavy metal. The clay-based heavy metal thermal curing agent comprises, by weight, 40-60% of clay, 5-15% of iron oxide, 20-30% of fly ash and 15-25% of stone flour. The method provided by the invention comprises the following steps of: uniformly mixing the clay-based heavy metal thermal curing agent and a heavy metal pollutant according to the mass ratio of 1: 5-10: 1, carrying out extrusion moulding on the mixed sample at the pressure of 300-1000Mpa, and sintering the molded sample at the temperature of more than 800 DEG C for 2-5 h to obtain a recycled material. According to the invention, heavy metal is coalesced by absorption of clay to heavy metal; fly ash and stone flour are used to fully mix heavy metal with the clay-based heavy metal thermal curing agent during the mixing process; iron oxide and alumina components in the clay-based heavy metal thermal curing agent react with heavy metal at the temperature of more than 800 DEG C for high-temperature fusion glass transition so as to form a spinel structure; and heavy metal in the form of spinel and feldspar crystal structural components is fixed in the heavy metal thermal curing agent to form the recycled material.

Description

Technical field: [0001] The invention belongs to the field of soil pollution restoration, and in particular relates to a clay-based heavy metal thermal curing agent and a method for curing heavy metals. Background technique: [0002] In the process of rapid economic development, industrial production and human activities have caused a large number of heavy metal pollutants to enter the environment, and soil, as the destination of pollutants, eventually accommodates a large number of complex heavy metal pollutants. Because heavy metal pollutants have the characteristics of wide pollution range, long duration, hidden pollution, and inability to be biodegraded, soil heavy metal pollution has become a stumbling block that endangers human health and hinders economic development. For example, the Guangdong Provincial Institute of Eco-environment and Soil Research conducted a systematic investigation and research on the soil pollution status of all cities in Guangdong Province. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33C09K17/08B09C1/08A62D101/43
Inventor 刘承帅李芳柏
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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