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Enhanced leaching of manganese from low-grade pyrolusite using ball milling and electric field.
Luo, Zhenggang; Shu, Jiancheng; Chen, Mengjun; Wang, Rong; Zeng, Xiangfei; Yang, Yong; Wang, Rui; Chen, Shuyuan; Liu, Renlong; Liu, Zuohua; Sun, Zhi; Yu, Keli; Deng, Yi.
Afiliación
  • Luo Z; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China.
  • Shu J; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China. Electronic address: shujc@swust.edu.cn.
  • Chen M; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China.
  • Wang R; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China.
  • Zeng X; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China.
  • Yang Y; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
  • Wang R; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China.
  • Chen S; Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, China.
  • Liu R; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
  • Liu Z; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
  • Sun Z; Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
  • Yu K; China National Resources Recycling Association, No.13, Yuetanbeixiaojie, Xicheng District, Beijing 100037, China.
  • Deng Y; Solid Waste and Chemical Management Technology Center of the Ministry of Ecological Environment, Beijing 100000, China.
Ecotoxicol Environ Saf ; 211: 111893, 2021 Mar 15.
Article en En | MEDLINE | ID: mdl-33461016
In this study, electric field and ball milling were used to leach Mn2+ from low-grade pyrolusite (LGP). The effects of current density, reaction time, reaction temperature, ball-to-powder weight ratio, and ball milling time on the leaching efficiency of Mn2+ from LGP as well as the leaching mechanism were systematically studied. The results showed that the combined use of electric field and ball milling enhanced the leaching of Mn2+ from LGP. The leaching efficiency of Mn2+ reached 97.79% under the optimum conditions of LGP-to-pyrite mass ratio of 1:0.18, current density of 30 mA/cm2, LGP-to-H2SO4 mass ratio of 1:0.4, liquid-to-solid ratio of 5:1, ball-to-powder weight ratio of 1:1, ball milling time of 2 h, temperature of 80 °C, and leaching duration of 120 min. This value was 25.95% higher than that attained without ball milling and 41.45% higher than that attained when neither ball milling nor electric field was employed. Pyrite was fully oxidized to generate additional SO42- and Fe3+, and was further hydrolyzed to form jarosite (KFe3(SO4)2(OH)6) and hydronium jarosite (Fe3(SO4)2(OH)5·2H2O) via ball milling and electric field application. Moreover, the electric field changed the surface charge distribution of the mineral particles and promoted collisions between them as well as the collapse of the crystal lattice, further improving the leaching efficiency of Mn2+ from LGP. This study provided a new method for leaching Mn from LGP.
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Texto completo: 1 Base de datos: MEDLINE Asunto principal: Manganeso / Modelos Químicos Idioma: En Revista: Ecotoxicol Environ Saf Año: 2021 Tipo del documento: Article

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Manganeso / Modelos Químicos Idioma: En Revista: Ecotoxicol Environ Saf Año: 2021 Tipo del documento: Article