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Solidification/stabilization of arsenic-bearing gypsum sludge using Portland cement: precalcination effect and arsenic immobilization mechanism

  • Yong LI Yuan XU Xing ZHU Hua WANG Xianjin QI Kongzhai LI Yonggang WEI
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  • 1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China 2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China

Received date: 2018-03-30

  Revised date: 2018-09-03

  Online published: 2018-11-19

Abstract

Arsenic-bearing gypsum sludge (ABG sludge), designated as one of the most important hazardous waste with high arsenic leaching toxicity in the metallurgical industry of nonferrous heavy metals, was treated by a hybrid technology combined with processes of precalcination and solidification/stabilization (S/S) using Portland cement for the arsenic immobilization. The precalcination effect and mechanism of arsenic immobilization were investigated in the S/S process. ABG sludge had an arsenic content of 8.56%, and its arsenic leaching concentration is high up to 1097.5 mg/L. The solidified fresh sludge had a high arsenic leaching concentration and low compression strength with a poor stability in acid neutralization capacity test. Those result indicated a further intensification of arsenic stablization was needed for the fresh sludge. Precalcination could reduce the arsenic leaching concentrations of sludge to a low level (41.2 and 4.2 mg/L for 600 and 700℃) when temperatures equal to or greater than 600℃ due to the removal of As(III). In subsequent S/S process, encapsulation and adsorption of arsenic in form of Ca2As2O7 and AlAsO4 by C?S?H products were responsible for the immobilization of arsenic in cement-sludge pastes. Precalcination also promoted the interaction between cement and arsenic in pastes, resulting in the intensification of AlAsO4 and dense Ca2As2O7 phase. The solidified pastes of ABG sludge precalcined at 600 and 700℃ possessed arsenic leaching concentrations (0.98 and 0.22 mg/L) lower than that of limit value (5 mg/L in GB5085.3-2007). This technology showed a favorable performance for the immobilization of ABG sludge and the solidified pastes are feasible for landfill disposal.

Cite this article

Yong LI Yuan XU Xing ZHU Hua WANG Xianjin QI Kongzhai LI Yonggang WEI . Solidification/stabilization of arsenic-bearing gypsum sludge using Portland cement: precalcination effect and arsenic immobilization mechanism[J]. The Chinese Journal of Process Engineering, 2018 , 18(S1) : 111 -121 . DOI: 10.12034/j.issn.1009-606X.20180108

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