欧津辰^a,b,刘 清^a,b,黑福前^b,招国栋^c,嵇唯杰^b,杨昊臻^b

(南华大学a. 高性能特种混凝土湖南省重点实验室,b. 土木工程学院,c. 资源环境与安全工程学院,湖南衡阳421001)

引用格式：欧津辰,刘清,招国栋,等.尾矿砂-S-95矿渣粉地聚物对铅离子的固化及其作用机制[J].中国粉体技术,2023,29(3)：127-134.

OU J C,LIU Q,ZHAO G D,et al.Properties and mechanism of lead ion solidification with tailing sand-S-95 slag powder geopolymer[J].China Powder Science and Technology,2023,29(3)：127-134.

DOI：10.13732/j.issn.1008-5548.2023.03.013

收稿日期： 2022-12-26,修回日期：2023-02-02，在线出版时间：2023-04-23 17:10。

基金项目：湖南省高校创新平台开发基金项目,编号：20k111;湖南省教育厅重点项目,编号：21A0286。

第一作者简介：欧津辰(1997—),男,硕士研究生,研究方向为固废处理。E-mail：983275135@qq.com。

通信作者简介：刘清(1979—),女,博士,教授,硕士生导师,研究方向为矿冶工程污染控制与资源化。E-mail：liuqing197901@163.com。

摘要： 地聚物是一种新型凝胶材料,主要以物理吸附或化学封装的方式固化重金属。以铁矿尾矿砂和S-95矿渣粉为原料,在碱激发剂的作用下制备固化重金属Pb²⁺地聚物。以正交试验研究原料质量比、水玻璃模数、碱固质量比对地聚物抗压强度的影响;研究Pb²⁺的添加量对固化体抗压强度的影响,并通过毒性浸出试验及XRD、IR表征手段探究固化效果和机理。结果表明：当尾矿砂与S-95矿渣粉质量比为3∶7、水玻璃模数为1.1、碱固比0.25时,地聚物28 d的抗压强度可达47.1 MPa;当Pb²⁺添加质量分数为0.5%时,在3种浸出液中固化效果均能达到98%以上;Pb²⁺以微弱的化学键合作用影响地聚物的网状结构,没有键合到骨架结构中,以非晶体的形式存在。

关键词： 地聚物;铅离子;固化;尾矿砂;矿渣粉

Abstract：Geopolymer is a new type of gel material,which mainly solidifies heavy metals by physical adsorption or chemical encapsulation.Using iron ore tailing sand and S-95 slag powder as raw materials to prepare geopolymer to solidify heavy metal Pb²⁺ under the action of alkali activator.The effect of factors on the compressive strength of geopolymer was investigated by orthogonal test and the influence of the Pb²⁺ content on the compressive strength was studied.The curing effect and mechanism were studied by toxic leaching test and characterization by XRD and IR.The results show that when the mass ratio of tailing sand to S-95 slag powder is 3∶7,the modulus of sodium silicate is 1.1,the alkali solid ratio is 0.25,and the water solid ratio is 0.25,the compressive strength of the geopolymer 28 d can reach 47.1 MPa.When the mass fraction of Pb²⁺ is 0.5%,the curing effect can reach more than 98% in all three leaching solutions.Pb²⁺ affects the net structure of the geopolymer with weak chemical bonding interaction and exists in a non-crystalline form rather than bonds into the skeletal structure.

Keywords：geopolymer;lead ion;curing;tailing sand;slag powder

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