A Novel Collector 5–(Butylthio)–1,3,4–
Thiadiazole–2–Thiol: Synthesis
and Improved Flotation of Galena
and Sphalerite from Pyrite
Wanjia Zhang, Zhiyong Gao, Runqing Liu, Haisheng Han, Pan Chen,
Yue Yang, Lei Sun, Chenyang, Zhang, Yuehua Hu, Jian Cao and Wei Sun
Abstract The introduction of aza-blocks into α-site of thiocarbonyl represents a
semiempirical strategy to impart exotic selectivity into collector molecules for sulfide mineral flotation. In this work, a novel thiadiazole derivative (5–(butylthio)–
1,3,4–thiadiazole–2–thiol, CSC-1) was atom-economically synthesized using easily
sourced raw materials (CS 2 , N 2 H 4 ·H 2 O, and haloalkane) and then used for the flotation of galena and sphalerite from pyrite. Flotation results showed that, compared
with ethyl xanthate, using CSC-1 as the collector, higher flotation recoveries of
sphalerite and galena with improved selectivity against pyrite were obtained. Furthermore, the results of contact angle and zeta potential measurements revealed that
CSC-1 molecule preferred to absorb on the surfaces of sphalerite and galena, rather
than that of pyrite. DFT calculations demonstrated that nitrogen heterocyclic ring
(conjugated thiocarbonyl and diazole structure), paralleled electron pairs location
lobes, and ring tension provided CSC-1 collector with preferable chelating selectivity towards Pb
2+ and Zn
2+ and deserved it to possess better flotation selectivity
for sphalerite and galena against pyrite than ethyl xanthate. This study indicates that
CSC-1 has a great industrial application potential in sulfide mineral flotation.
Keywords Collector · Flotation · Galena · Sphalerite · Pyrite
W. Zhang · Z. Gao (B) · R. Liu · H. Han · P. Chen · Y. Yang · L. Sun · Chenyang · Zhang · Y. Hu ·
J. Cao · W. Sun (B)
School of Minerals Processing and Bioengineering, Central South University, Changsha, China
e-mail: zhiyong.gao@csu.edu.com
W. Sun
e-mail: sunmenghu@126.com
Y. Hu
e-mail: hyh@csu.edu.cn
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic
Calcium-Containing Mineral Resources, Central South University, Changsha, China
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_55
633
Thiadiazole–2–Thiol: Synthesis
and Improved Flotation of Galena
and Sphalerite from Pyrite
Wanjia Zhang, Zhiyong Gao, Runqing Liu, Haisheng Han, Pan Chen,
Yue Yang, Lei Sun, Chenyang, Zhang, Yuehua Hu, Jian Cao and Wei Sun
Abstract The introduction of aza-blocks into α-site of thiocarbonyl represents a
semiempirical strategy to impart exotic selectivity into collector molecules for sulfide mineral flotation. In this work, a novel thiadiazole derivative (5–(butylthio)–
1,3,4–thiadiazole–2–thiol, CSC-1) was atom-economically synthesized using easily
sourced raw materials (CS 2 , N 2 H 4 ·H 2 O, and haloalkane) and then used for the flotation of galena and sphalerite from pyrite. Flotation results showed that, compared
with ethyl xanthate, using CSC-1 as the collector, higher flotation recoveries of
sphalerite and galena with improved selectivity against pyrite were obtained. Furthermore, the results of contact angle and zeta potential measurements revealed that
CSC-1 molecule preferred to absorb on the surfaces of sphalerite and galena, rather
than that of pyrite. DFT calculations demonstrated that nitrogen heterocyclic ring
(conjugated thiocarbonyl and diazole structure), paralleled electron pairs location
lobes, and ring tension provided CSC-1 collector with preferable chelating selectivity towards Pb
2+ and Zn
2+ and deserved it to possess better flotation selectivity
for sphalerite and galena against pyrite than ethyl xanthate. This study indicates that
CSC-1 has a great industrial application potential in sulfide mineral flotation.
Keywords Collector · Flotation · Galena · Sphalerite · Pyrite
W. Zhang · Z. Gao (B) · R. Liu · H. Han · P. Chen · Y. Yang · L. Sun · Chenyang · Zhang · Y. Hu ·
J. Cao · W. Sun (B)
School of Minerals Processing and Bioengineering, Central South University, Changsha, China
e-mail: zhiyong.gao@csu.edu.com
W. Sun
e-mail: sunmenghu@126.com
Y. Hu
e-mail: hyh@csu.edu.cn
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic
Calcium-Containing Mineral Resources, Central South University, Changsha, China
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_55
633