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黄金科学技术 ›› 2019, Vol. 27 ›› Issue (5): 762-769.doi: 10.11872/j.issn.1005-2518.2019.05.762

• 采选技术与矿山管理 • 上一篇    下一篇

两种固化剂对湘潭锰矿区土壤中重金属的固化效应

熊子旗1(),刘希灵1(),李志贤2,李伟亚1,曾星2   

  1. 1. 中南大学资源与安全工程学院,湖南 长沙 410083
    2. 湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室,湖南 湘潭 411201
  • 收稿日期:2019-02-21 修回日期:2019-06-11 出版日期:2019-10-31 发布日期:2019-11-07
  • 通讯作者: 刘希灵 E-mail:xiongziqier@163.com;lxlenglish@163.com
  • 作者简介:熊子旗(1995-),女,江西南昌人,硕士研究生,从事土壤重金属污染固化修复研究工作。xiongziqier@163.com
  • 基金资助:
    国家自然科学基金“镉富集植物—农作物间作对农作物吸收镉的阻控效应及其机理研究”(31400374);大豆累积重金属锰的效应及机理研究”(31671635);湖南省重点研发项目“生物联合阻控关键技术及其在锰污染农田中的应用”(2017SK2385)

Solidification Effect of Two Curing Agents on Heavy Metals in Xiangtan Manganese Mine Area Soil

Ziqi XIONG1(),Xiling LIU1(),Zhixian LI2,Weiya LI1,Xing ZENG2   

  1. 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
    2. Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China
  • Received:2019-02-21 Revised:2019-06-11 Online:2019-10-31 Published:2019-11-07
  • Contact: Xiling LIU E-mail:xiongziqier@163.com;lxlenglish@163.com

摘要:

为探究生石灰(CaO)、羟基磷灰石(HAP)2种固化剂对湘潭锰矿区土壤中重金属锰(Mn)、铅(Pb)、铬(Cr)的固化效应,将2种固化剂以不同的施入量进行单一和组配固化处理,测定土壤中有效态Mn、Pb、Cr的含量并进行方差分析和相关性分析。结果表明:各固化处理均可极显著(p<0.01)降低土壤中有效态Mn、Pb的含量;对于土壤中有效态Cr,单一生石灰固化处理可极显著(p<0.01)降低其含量,而羟基磷灰石施入量为1%时方可使其含量降低80.40%,同时组配处理对Cr的固化效果也不理想。相关性分析表明:生石灰的施入量与土壤中有效态Mn含量呈极显著(p<0.01)负相关,羟基磷灰石的施入量与土壤中有效态Mn、Pb含量呈极显著(p<0.01)负相关。故2种试剂的单一和组配处理对湘潭锰矿区土壤中Mn、Pb有较好的固化效果,单一生石灰处理对湘潭锰矿区土壤中Cr有较好的固化效果。

关键词: 湘潭锰矿区, 重金属污染, 生石灰, 羟基磷灰石, 单一处理, 组配处理

Abstract:

As an effective remediation method for heavy metal pollution of soil,solidification remediation technology has become more mature and been widely used due to its low investment,quick response,simple operation and other advantages.Xiangtan manganese mine had rich manganese reserves and greatly promoted the economic development of Xiangtan area.However,the exploitation of mineral resources and the disorder accumulation of manganese residues result in the environmental problems of soil heavy metal pollution in Xiangtan manganese mine area.In order to explore the solidification remediation effect of solidification remediation technology on heavy metals in soil of Xiangtan manganese mine area,in the experiment,quicklime(CaO) and hydroxyapatite(HAP) were selected as curing agents to study the curing effect of their single and combined treatments on manganese(Mn),lead(Pb) and chromium(Cr) in the soil of Xiangtan manganese mine area.The specific research process is as follows:First of all,the soil samples were taken from the surrounding land of Xiangtan manganese mine(27°78′N,112°47′E),the soil at the depth of 0~20 cm was collected from five different sites and mixed evenly,and then brought back to the laboratory,the relevant parameters of the soil and the contents of Mn,Pb and Cr in the soil were determined.Secondly,0.10 mol/L hydrochloric acid reagent was used to extract effective Mn,Pb and Cr from soil,and the content was determined.Thirdly,the effect of curing treatments on the content of available Mn,Pb and Cr in soil was explored through variance analysis and correlation analysis.The results manifested that the content of available Mn and Pb in soil could be decreased significantly(p<0.01) by all curing treatments.The single curing treatments of CaO could reduce the content of available Cr in soil significantly(p<0.01),and there was a significantly(p<0.01) negative correlation between the dosage of CaO and the content of available Mn in soil,the application dosage of HAP had a significantly(p<0.01) negative correlation with the content of effective Mn and Pb in soil.The results show that the single and combined treatments of the two reagents have a good curing effect on available Mn and Pb in the soil of Xiangtan manganese mine area,and the single treatments of CaO generated good curing effect on available Cr in the soil of Xiangtan manganese mine area.

Key words: Xiangtan manganese mine area, heavy metal pollution, quicklime, hydroxyapatite, single treatments, combined treatments

中图分类号: 

  • X53

表1

土壤相关参数"

土壤类型pH值有机质含量/(g·kg-1磷含量/(g·kg-1氮含量/(g·kg-1重金属含量/(mg·kg-1
MnPbZn
红壤5.4217.2650.5430.733202.577.556.25

表2

生石灰杂质组成"

成分质量分数/%成分质量分数/%
氯化物0.0030.015
硝酸盐0.004碱金属及镁0.5
硫酸盐0.1氨沉淀0.2

表3

羟基磷灰石相关参数"

参数数值参数数值
平均粒径/μm<50灼烧失重/%2.95
HAP含量/%>99pH值7.41
重金属含量/(×10-6<8盐酸不溶物含量/%0.02
砷含量/(×10-6<1

表4

试验方案"

处理方案生石灰/%羟基磷灰石/%处理方案生石灰/%羟基磷灰石/%
CK(空白)00T815
T110T9110
T250T1051
T3100T1155
T401T12510
T505T13101
T6010T14105
T711T151010

图1

不同处理方案对土壤有效态Mn、Pb和Cr含量的影响(a)各处理方案对有效态Mn含量的影响;(b)各处理方案对有效态Pb含量的影响;(c)各处理方案对有效态Cr含量的影响注:a,b,c,d,e不同字母表示不同处理方案的数据在p<0.01水平上有极显著差异,含有相同字母表示不同组数据间的差异不显著"

表5

不同固化处理方案对土壤pH值的影响"

处理方案pH值处理方案pH值
CK(空白)5.42±0.006jT810.17±0.098e
T110.19±0.035eT910.05±0.025e
T212.71±0.017dT1012.80±0.003cd
T312.76±0.009cdT1112.95±0.023abc
T46.73±0.033iT1213.04±0.010ab
T57.67±0.015hT1312.81±0.012bcd
T68.47±0.096gT1412.95±0.006abc
T79.50±0.095fT1513.06±0.006a

表6

pH值、固化剂用量与土壤有效态重金属含量的相关系数"

指标pH值CaOHAP组配固化MnPbCr
pH值10.772**0.910**0.722**-0.781**-0.288-0.171
CaO111-0.667**-0.294-0.048
HAP11-0.747**-0.573**0.636**
组配固化1-0.496-0.2870.237
Mn10.515-0.500
Pb10.282
Cr1
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