Recycling of arsenic-containing biohydrometallurgy waste to produce a binder for cemented paste backfill: Co-treatment with oil shale residue

Yingliang Zhao; Xiaowei Gu; Jingping Qiu; Shiyu Zhang; Zhenbang Guo; Xiaogang Sun

doi:10.1016/j.jenvman.2022.115621

Recycling of arsenic-containing biohydrometallurgy waste to produce a binder for cemented paste backfill: Co-treatment with oil shale residue

J Environ Manage. 2022 Oct 1:319:115621. doi: 10.1016/j.jenvman.2022.115621. Epub 2022 Jul 15.

Authors

Yingliang Zhao¹, Xiaowei Gu², Jingping Qiu³, Shiyu Zhang⁴, Zhenbang Guo¹, Xiaogang Sun¹

Affiliations

¹ College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China.
² College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China. Electronic address: guxiaowei@mail.neu.edu.cn.
³ College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China. Electronic address: qiujingping@mail.neu.edu.cn.
⁴ College of Resources and Civil Engineering, Northeastern University, Shenyang, China; College of Mining Engineering, Taiyuan University of Technology, Taiyuan, China.

PMID: 35849925
DOI: 10.1016/j.jenvman.2022.115621

Abstract

The high cost of ordinary Portland cement (OPC) limits the broad usage of cemented paste backfill (CPB). Additionally, improper disposal of arsenic-containing biohydrometallurgy waste (BW) can cause tremendous pollution to the environment. Consequently, BW is used to prepare an alternative cementitious material for CPB in this study. The effect of calcined oil shale residue (COSR) on the binder's characteristics was studied. The reaction kinetics of the binder in the presence of COSR were studied via the isothermal calorimeter test and the Krstulovic-Dabic model; mechanical strength and hydration product modifications due to the addition of COSR were also investigated. The leaching of hazardous elements from the binder was also investigated. The results showed that adding COSR reduced the flowability of fresh slurry and early-age compressive strength; however, adding 20 wt% COSR resulted in the highest later age compressive strength, thereby reaching ∼43.65 MPa after 60 days. The compressive strength of the CPB sample using the COSR20 as a binder may reach ∼87% of the OPC-based CPB sample. Furthermore, the presence of COSR had no significant effect on the phase assembles but changed the amount of ettringite (AFt) and calcium silicate aluminate hydrate (C-A-S-H). The results of this study show that the prepared binder could be used as an alternative to OPC in CPB.

Keywords: Arsenic; Biohydrometallurgy waste; Cemented paste backfill; Compressive strength; Oil shale residue.

MeSH terms

Arsenic*
Compressive Strength
Construction Materials*
Recycling

Substances

Arsenic