自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 8    No. 3    September 2001

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Dynamics of electrodeposition of tetraethylthioram
disulphide(TETD) on pyrite surface
QINWen-qing,QIUGuan-zhou,HUYue-hua,XU Jing

Department ofMineral Enginering, Central SouthUniversity, Changsha 410083, China

Abstract:The electrode process of pyrite in diethyldithiocarbamate (DDTC) solution pH 11.4 was investigated by using cyclic voltammetry, potentiostatic and chronopotentiometry. Tetraethylthioram disulphide (TETD) was electrodeposited on pyrite electrode surface as the electrode potential is higher than 0.2 V. The relationship of the current density caused by diffusion and reaction time can be ascertained asi=1/(9.08×10-5+4.77×10-3t0.5), and the diffusion coefficient of DDTC on pyrite surface is about 3.72×10-6cm2/s. At pH11.4, the thickness ofTETD adsorbed on pyrite surface is about 1.63 molecule layer. The electrochemical dynamics equation of the reduction ofTETD on pyrite surface is given asη=0.116-0.064log[1-(t/τ)0.5]. The kinetic parameters were determined as follows: the exchange current density (i0) is 3.08μA/cm2; the transmission coefficient(α) is 0.462.

 

Key words: electrode process; pyrite; electrochemistry of flotation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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