LONG-TERM LEACHING BEHAVIORS OF HEAVY METALS FROM STEEL SLAG IN CEMENT-BASED CEMENTITIOUS MATERIALS

LI Sha; WANG Zhaojia; WANG Mingwei; ZHENG Yongchao; ZHAN Jiayu

doi:10.13205/j.hjgc.202303018

Volume 41 Issue 3

Mar. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(3): 136-142

LI Sha, WANG Zhaojia, WANG Mingwei, ZHENG Yongchao, ZHAN Jiayu. LONG-TERM LEACHING BEHAVIORS OF HEAVY METALS FROM STEEL SLAG IN CEMENT-BASED CEMENTITIOUS MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 136-142. doi: 10.13205/j.hjgc.202303018

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LI Sha, WANG Zhaojia, WANG Mingwei, ZHENG Yongchao, ZHAN Jiayu. LONG-TERM LEACHING BEHAVIORS OF HEAVY METALS FROM STEEL SLAG IN CEMENT-BASED CEMENTITIOUS MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 136-142. doi: 10.13205/j.hjgc.202303018

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LONG-TERM LEACHING BEHAVIORS OF HEAVY METALS FROM STEEL SLAG IN CEMENT-BASED CEMENTITIOUS MATERIALS

doi: 10.13205/j.hjgc.202303018

1. State Key Laboratory of Solid Waste Reuse for Buiding Materials, Beijing Building Materials Academy of Sciences Research, Beijing 100041, China;
2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China

Received Date: 2022-03-31
Available Online: 2023-05-26
Publish Date: 2023-03-01

Abstract

Abstract

The long-term leaching rule of heavy metals from steel slag in the wortar was studied by continuous flume leaching test, and the cumulative leaching amount of heavy metals in 30 years was predicted by fitting the leaching kinetic model. The results showed that the steel slag contained heavy metals such as As, Cr, Cu, Mn, Ni, Pb and Zn, and the leaching amount of Cr, Cu, Ni and Zn was higher after the preparation of mortar. With the increase of leaching time, the cumulative leaching amount of heavy metal ions in the solution increased first and then slowed down; the longer the pre-curing age of the mortar was, the lower the cumulative leaching amount of heavy metals was, and the more obvious the solidification effect on Zn was. The leaching law of Cr and Ni, Cu and Zn in cement mortar conformed to the Elovich equation and double constant rate equation, respectively the leaching law of Cu in steel slag mortar conformed to the double constant rate equation, and the leaching law of Cr, Ni and Zn conformed to the second order kinetic equation. According to the calculation of the kinetic equation, it was predicted that the cumulative leaching amount of Cr, Cu, Ni and Zn in steel slag mortar and pure cement mortar in 30 years was reduced by 49.52%, 24.02%, 47.20% and 89.79%, respectively.
- steel slag,
- cement-based,
- binding material,
- heavy metal,
- long-term leaching

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References(38)

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