Arsenic removal from contaminated soils for recycling via oil agglomerate flotation

被引：32
作者：
Choi, Junhyun [1 ]
Lee, Eunseong [1 ]
Choi, Siyoung Q. [2 ]
Lee, Seungwoo [3 ]
Han, Yosep [1 ]
Kim, Hyunjung [1 ]
机构：
[1] Chonbuk Natl Univ, Dept Mineral Resources & Energy Engn, Jeonju 561756, Jeonbuk, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 305701, South Korea
[3] JIU Corp, Geoenvironm Div, Seoul 157801, South Korea
来源：
CHEMICAL ENGINEERING JOURNAL | 2016年 / 285卷
基金：
新加坡国家研究基金会;
关键词：
Arsenic recovery; Conventional flotation; Oil agglomerate flotation; Recycling; Fine particles; FINES CLEANING WASTES; MOLYBDENITE FINES; SULFIDE MINERALS; COAL RECOVERY; XANTHATE; SURFACE; ARSENOPYRITE; ACTIVATION; ADSORPTION; SPHALERITE;
D O I：
10.1016/j.cej.2015.09.105
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, a flotation process is proposed for separating the arsenic-bearing minerals to recycle the soil surrounding the Janghang refinery in South Korea, which contains a high level of arsenic. To maximize the arsenic recovery, several experimental parameters were systematically investigated. X-ray diffraction revealed that the contaminated soil was mainly composed of arsenopyrite (FeAsS), arsenic trioxide (AS(4)O(6)), arsenic pentoxide (As2O5), and quartz (SiO2). Flotation experiments with various concentrations of potassium amyl xanthate (PAX) showed that arsenic recovery increased with increasing PAX concentration. The addition of activators (Na2S, CuSO4, Na2S + CuSO4) in pulp pH greatly increased the arsenic recovery. In addition, oil agglomerate flotation was conducted to enhance the arsenic recovery by improving the separation of fine particles. The results showed that arsenic recovery increased with increasing nonpolar oil concentration. Based on the results obtained from the,optimization tests, a flotation process by which the arsenic-contaminated soils can be recycled was successfully designed. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：207 / 217
页数：11
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