資源・素材 & EARTH 2017(札幌)

講演情報(2017年8月24日付)

企画講演(Special Session)

EARTH

2017年9月27日(水) 13:00 〜 17:00 第8会場 C310 (C棟3階/Fl.3.,Build. C)

司会(Chairman):Kazutoshi Haga (Akita University), Makoto Harita (Harita Metal Co lyd), Apisit Numprasanthai (Chulalongkorn University), Shuji Owada (Waseda University), Dodbiba Gjergj(University of Tokyo)

16:30 〜 16:45

[2801-14-13] Using flotation waste and neutralization sludge from copper smelting as one-part replacement of cement binder to solidify/stabilize arsenic-containing sludge

Degang Liu1, ○Xiaobo Min1,2, Yong Ke1,2, Liyuan Chai1,2, Yanjie Liang1,2, Yuancheng Li1, Liwei Yao1, Zhongbing Wang1 (1. Central South University, 2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution)

司会(Chairman):Dodbiba Gjergj(University of Tokyo), Shuji Owada (Waseda University)

キーワード:stabilization/solidification, arsenic-containing sludge, heavy metals, cement clinker

This work investigated the utilization of flotation waste of copper slag (FWCS) and neutralization sludge as one-part replacement of cement binder to treat arsenic-bearing gypsum sludge produced by lime-ferrate process from copper smelting industry. The binder ratio (mass ratio of m(FWCS)-m(neutralization sludge)-m(cement clinker)) was determined to be 40: 10: 50 according to the optimal experiments. When the binder was mixed with arsenic-bearing gypsum sludge with a mass ratio of 5:5, the unconfined compressive strength (UCS) of matrix can reach 11.06 MPa after curing 28 days, which meets the required UCS level of MU10 brick in China. At the same time, the heavy metals concentrations in leachate from matrix were all below the limit of China standard leaching test (CSLT). The Cu, Zn, Cd, Hg, Be, Ni, and Se were not detected, and the concentrations of As and Pb were 1.36 and 1.01 mg/L, respectively. Therefore, the matrices had a potential to use as brick in industrial construction.

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