磷石膏与铜尾渣的高效耦合固定/稳定化处理

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (5): 1601-1609.

所属专题：资源综合利用

磷石膏与铜尾渣的高效耦合固定/稳定化处理

王维^1,2, 许向群^1,2, 李杰^1,2, 郭莉^1,2, 陈荣升³, 杜冬云^1,2

1.中南民族大学资源与环境学院,湖北省重金属污染防治工程技术研究中心,武汉 430074;
2.中南民族大学,催化转化与能源材料化学教育部重点实验室,武汉 430074;
3.湖北大江环保科技股份有限公司,黄石 435005

收稿日期:2021-02-05 修回日期:2021-03-04 出版日期:2021-05-15 发布日期:2021-06-07
通讯作者: 杜冬云,博士,教授。E-mail:dydu666@mail.scuec.edu.cn
作者简介:王维(1994—),男,硕士研究生。主要从事污染控制化学方面的研究。E-mail:wangwei.scu@qq.com
基金资助:
湖北省重大科技创新项目(2019ACA156);湖北省重点研发计划(2020BCB062)

Efficient Synergistic Stabilization/Solidification of Phosphogypsum and Copper Smelter Slag

WANG Wei^1,2, XU Xiangqun^1,2, LI Jie^1,2, GUO Li^1,2, CHEN Rongsheng³, DU Dongyun^1,2

1. Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, China;
2. Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, South-Central University for Nationalities, Wuhan 430074, China;
3. Hubei Dajang Environmental Technology Co., Ltd., Huangshi 435005, China

Received:2021-02-05 Revised:2021-03-04 Online:2021-05-15 Published:2021-06-07

摘要/Abstract

摘要： 磷石膏(PG)和铜尾渣(CSS)是磷化工和有色冶炼行业中产生的两种固废,含有大量可迁移性有害物质,在堆存过程中能对环境造成污染。向PG、CSS混合渣中添加CaO作为额外钙源、NaOH作为激发剂,加入约30%(质量分数)的水,搅拌均匀,通过机械压模制成固结体(PG-S),经过抗压测试和毒性浸出试验,结果表明:PG-S抗压强度可达到14.8 MPa; PG中的主要污染物$PO^{3-}_{4}$、F^-的固定率分别达到99.87%和92.13%,重金属锌、铅等有害物质的浸出浓度均能满足《污水综合排放标准》(GB 8978—1996)要求,实现了对PG、CSS的高效耦合固定/稳定化处理。通过XRD、SEM表征分析证明PG、CSS中的有害物质通过生成不溶物和胶凝包裹吸附而被固定。

关键词: 磷石膏, 铜尾渣, 固定化, 废物处理, 活化

Abstract: Phosphogypsum (PG) and copper smelter slag (CSS) are solid wastes produced from phosphorus chemical industries and nonferrous metal smelting industries. PG mainly consists of CaSO₄·2H₂O with harmful impurities such as residual acids, phosphate, fluorides, and trace metals (e.g., Cr, As and Cd). CSS contains large amounts of heavy metals such as lead and zinc. The soluble portions of the harmful substances in PG and CSS may enter the environment and cause serious pollution problems. In this study, NaOH and CaO were added as activators and additional calcium sources in mixed slag of PG and CSS with water to produce cemented blocks (named PG-S). Unconfined compressive strength (UCS) test and leaching test show that the compressive strength of PG-S reaches 14.8 MPa, and the stabilization efficiency of $PO^{3-}_{4}$ and F^- in PG are 99.87% and 92.13%, respectively. The concentrations of heavy metal zinc, lead and other harmful substances in the leaching solution meet the requirements of "integrated wastewater discharge standard" (GB 8978—1996) of China. The stabilization/solidification (S/S) of PG and CSS using the proposed method shows high efficiency and feasibility. Through XRD and SEM analysis, the stabilized wastes show structures similar to C-S-H, ettringite, Zn₃(PO₄)₂(H₂O)₄, Pb₁₀(PO₄)₆(OH)₂ and CaF₂. On this basis, the possible mechanism of the stabilization/solidification process is: the harmful substances in PG and CSS may be stabilized/solidified by formation of insoluble substances and adsorption of cementitious substances.

Key words: phosphogypsum, copper smelter slag, immobilization, waste treatment, activation

中图分类号:

X705

王维, 许向群, 李杰, 郭莉, 陈荣升, 杜冬云. 磷石膏与铜尾渣的高效耦合固定/稳定化处理[J]. 硅酸盐通报, 2021, 40(5): 1601-1609.

WANG Wei, XU Xiangqun, LI Jie, GUO Li, CHEN Rongsheng, DU Dongyun. Efficient Synergistic Stabilization/Solidification of Phosphogypsum and Copper Smelter Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1601-1609.

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磷石膏与铜尾渣的高效耦合固定/稳定化处理

Efficient Synergistic Stabilization/Solidification of Phosphogypsum and Copper Smelter Slag

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