Enhanced leaching of manganese from low-grade pyrolusite using ball milling and electric field

被引：31

作者：

Luo, Zhenggang ^{[1
]}

Shu, Jiancheng ^{[1
]}

Chen, Mengjun ^{[1
]}

Wang, Rong ^{[1
]}

Zeng, Xiangfei ^{[1
]}

Yang, Yong ^{[2
]}

Wang, Rui ^{[1
]}

Chen, Shuyuan ^{[1
]}

Liu, Renlong ^{[2
]}

Liu, Zuohua ^{[2
]}

Sun, Zhi ^{[3
]}

Yu, Keli ^{[4
]}

Deng, Yi ^{[5
]}

机构：

[1] Southwest Univ Sci & Technol, Key Lab Solid Waste Treatment & Resource Recycle, Minist Educ, 59 Qinglong Rd, Mianyang 621010, Sichuan, Peoples R China

[2] Chongqing Univ, Sch Chem & Chem Engn, Chongqing 400044, Peoples R China

[3] Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China

[4] China Natl Resources Recycling Assoc, 13 Yuetanbeixiaojie, Beijing 100037, Peoples R China

[5] Minist Ecol Environm, Solid Waste & Chem Management Technol Ctr, Beijing 100000, Peoples R China

来源：

ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY | 2021年 / 211卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Mn2+; Low-grade pyrolusite; Ball milling; Electric field; Enhanced leaching;

D O I：

10.1016/j.ecoenv.2021.111893

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, 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 degrees 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 (Fe-3(SO4)(2)(OH)(5)center dot 2H(2)O) 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.

引用

页数：9

共 49 条

[1] BIOLOGICAL AND CHEMICAL-PROCESSING OF LOW-GRADE MANGANESE ORES [J].