Immobilisation of high-arsenic-containing tailings by using metallurgical slag-cementing materials

Yuying Zhang; Siqi Zhang; Wen Ni; Qihui Yan; Wei Gao; Yunyun Li

doi:10.1016/j.chemosphere.2019.02.030

Immobilisation of high-arsenic-containing tailings by using metallurgical slag-cementing materials

Chemosphere. 2019 May:223:117-123. doi: 10.1016/j.chemosphere.2019.02.030. Epub 2019 Feb 8.

Authors

Yuying Zhang¹, Siqi Zhang², Wen Ni³, Qihui Yan⁴, Wei Gao⁵, Yunyun Li⁶

Affiliations

¹ School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: zhangyuying0821@gmail.com.
² School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: zsq2017@ustb.edu.cn.
³ School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: niwen@ces.ustb.edu.cn.
⁴ School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: 498441094@qq.com.
⁵ School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: gweiustb@163.com.
⁶ School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, China; Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China; Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: lyyustb@163.com.

PMID: 30772590
DOI: 10.1016/j.chemosphere.2019.02.030

Abstract

The mixture of finely ground blast furnace slag (BFS), basic oxygen furnace (BOF) steel slag (SS), and flue gas desulfurisation (FGD) gypsum could be used as cement to solidify heavy metals. In this study, these cementitious materials were combined with high-arsenic-containing tailings to form cemented backfill material (CBM). The results indicated that the optimal design of CBM was that of specimen CBM2 which showed good early strength (10.09 MPa) at a curing age of 3 days containing 60% BF slag, 30% SS, and 10% gypsum. And the arsenic leaching concentration of CBM2 at a curing age of 7 days and 28 days were both less than the limits specified in standards for drinking water quality (Chinese Standard GB 5749-2006). The predominant hydration products of CBM2 contained rod-like ettringite and amorphous C-S-H gel both of which promote arsenic solidification.

Keywords: Arsenic; Blast furnace slag; Cementitious materials; Immobilisation; Steel slag.

MeSH terms

Arsenic / isolation & purification*
Calcium Sulfate
Cementation
Construction Materials*
Industrial Waste
Metallurgy*
Minerals
Steel

Substances

Industrial Waste
Minerals
ettringite
Steel
Arsenic
Calcium Sulfate