Study on the Passivation Effect of Natural and Modified Attapulgite on Heavy Metal Lead in Soils of the Rare Earth Tailings

CHEN Zhe; FENG Xiu-juan; ZHU Yi-chun; LI Dong-ming

doi:10.15898/j.cnki.11-2131/td.202006250096

Rock and Mineral Analysis > 2020 > 39(6): 847-855. > DOI: 10.15898/j.cnki.11-2131/td.202006250096

CHEN Zhe, FENG Xiu-juan, ZHU Yi-chun, LI Dong-ming. Study on the Passivation Effect of Natural and Modified Attapulgite on Heavy Metal Lead in Soils of the Rare Earth Tailings[J]. Rock and Mineral Analysis, 2020, 39(6): 847-855. DOI: 10.15898/j.cnki.11-2131/td.202006250096

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Study on the Passivation Effect of Natural and Modified Attapulgite on Heavy Metal Lead in Soils of the Rare Earth Tailings

College of Architecture and Mapping, Jiangxi University of Science and Technology, Ganzhou 341000, China

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Received Date: June 24, 2020
Revised Date: August 20, 2020
Accepted Date: September 18, 2020
Published Date: October 31, 2020

Abstract

HIGHLIGHTS
(1) The reason for choosing hydrochloric acid and 3-mercaptopropyl trimethoxysilane as modifying agent was discussed.

(2) The combined modification of hydrochloric acid and organic compounds simultaneously increased the surface area and functional groups of the attapulgite, which significantly improved the passivation ability of lead compared with the single modification.

(3) Compared with natural attapulgite, modified attapulgite reduced the extraction of acid from the soil and reduced the bioavailability of heavy metals in the soil.

ABSTRACT

BACKGROUNDThe large-scale mining of ion-type rare earth mines in southern Jiangxi and the unreasonable disposal of tailings and slag caused heavy metal lead content to be deposited in the surrounding environment of the mining area, exceeding the standard level, and destroying the ecological environment of the mining area.
OBJECTIVESTo passivate the lead in the soil of the mining area to reduce its bioavailability and ecological risks.
METHODSNatural and modified attapulgite with different dosages (mass fractions of 5%, 10%, and 15%) were used as passivating agents. Scanning electron microscopy and Fourier infrared were used to analyze the surface characteristics and functional groups of the two passivating agents. Passivation ability and effect were evaluated by BCR continuous extraction method of heavy metals, and form changes of lead in the soil were also studied by this method. Environmental quality of heavy metal contaminated soil was also evaluated using foreign heavy metal TCLP extraction methods.
RESULTSAfter 50 days of cultivation, the modified attapulgite reduced the acid-extracted content of lead from 25.69 to 7.42mg/kg, the residual content increased by 1.38 times and the TCLP extracted content decreased by 65.70% compared to the control group, significantly reducing the bioavailability and ecological risk from lead.
CONCLUSIONSCompared with the natural attapulgite, the modified attapulgite has a better effect on the soil remediation of rare earth tailings.
- rare earth tailings,
- in situ immobilization,
- passivating agent,
- form transformation,
- soil remediation

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Study on the Passivation Effect of Natural and Modified Attapulgite on Heavy Metal Lead in Soils of the Rare Earth Tailings

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