Selective Removal of Arsenic Compounds from the Contaminated Paddy Soil in China Using Froth Flotation Technique

Lee, Seungwoo; Jeon, Chilsung; Lee, Eunseong; Yoo, Kyungmin; Choi, Junhyun; Kim, Hyunjung; Lee, Seungwoo; Jeon, Chilsung; Lee, Eunseong; Yoo, Kyungmin; Choi, Junhyun; Kim, Hyunjung

doi:2016.38.7.343

The Korean text of this paper can be translated into multiple languages on the website of http://jksee.or.kr through Google Translator.

J Korean Soc Environ Eng > Volume 38(7); 2016 > Article

Original Paper

J Korean Soc Environ Eng 2016;38(7): 343-352. doi: https://doi.org/10.4491/KSEE.2016.38.7.343

포말부선 기술을 이용한 중국 오염농경지내 비소화합물의 선택적 제거

이승우¹, 전칠성¹, 이은성¹, 유경민¹, 최준현², 김현중²

¹지우이앤이(주) 지반환경사업
²전북대학교 자원에너지공학과

Selective Removal of Arsenic Compounds from the Contaminated Paddy Soil in China Using Froth Flotation Technique

Seungwoo Lee¹, Chilsung Jeon¹, Eunseong Lee¹, Kyungmin Yoo¹, Junhyun Choi², Hyunjung Kim²

¹Geo-environment Division, JIU Corporation
²Department of Mineral Resources and Energy Engineering, Chonbuk National University

Corresponding author

Seungwoo Lee ,Tel: 02-6968-5858, Fax: 02-6968-5853, Email: swlee@jiuene.com

Received: November 6, 2015; Revised: December 21, 2015; Accepted: April 7, 2016. Published online: July 31, 2016.

ABSTRACT

Effects of grinding time and chemicals dosage in arsenic removal from contaminated paddy soil in China were investigated using lab scale attrition and froth flotation combining process. Arsenic concentration in the field soil was 76.51 mg/kg, exceeding Korean and Chinese standards, and predominant arsenic compounds fraction in sequential extraction was “residual” (over 80%). After wet sieving, soil with >2 mm and < 0.038 mm showed concentration lower than ‘Warning Level’ in Korea. Soil with 0.038-0.075 mm, showing the highest concentration, was discarded since it occupied minor weight fraction (10.1%). Thus soil between 0.075 and 2 mm was only used in the combining process. The highest Arsenic concentration in progeny fragments smaller than 0.038 mm reached up to 981.66 mg/kg after 5 min of attrition. Optimal dosage of collector (C₅H₁₁OCS₂K) and modifier (Na₂S and CuSO₄) in froth flotation process for the selective separation of the chipped progeny particles from the parent fragments were determined both as 200 g/ton. Arsenic removal efficiency in froth flotation process was 38.47% and it was increased to 72.74% in additional flotation process, scavenging. Average arsenic concentration after overall process - wet sieving, attrition and froth flotation - was estimated to 16.45 mg/kg.

Key Words: Arsenic Contaminated Soils, Attrition Grinding, Froth Flotation, Sequential Extraction, Soil Remediation