Effects of sulfide and lead nitrate addition to a gold cyanidation circuit using potentiodynamic measurements

May, O.; Jin, S.; Ghali, E.; Deschênes, G.
February 2005
Journal of Applied Electrochemistry;Feb2005, Vol. 35 Issue 2, p131
Academic Journal
Corrosion potentiodynamic polarization experiments on a gold electrode in a cyanide solution with 0-30?ppm lead addition and 0-20?ppm sulfide were carried out. Solutions containing 300?ppm NaCN, adjusted to a pH 11.1 by NaOH and bubbled with air were used at atmospheric pressure and room temperature. If the concentration of lead ions was equal or larger than the sulfide ions a change of potential towards the more negative potential (a potential drop) was observed and this was accompanied by a significant increase in the corrosion rate (up to 10?mm?y-1 in certain circumstances). If lead nitrate was added to a solution with a gold electrode that had been previously passivated by sulfides, the corrosion rate typically rose from about 0.3 to 0.95?mm?y-1. The addition of lead nitrate to sulfides in cyanide solution can create a synergetic effect which results in an increase in dissolution rates of gold in cyanide solutions and this is accompanied by a drop in the corrosion potential of gold and a dramatic decline in thiocyanate and free sulfide concentrations.


Related Articles

  • Corrosion-Electrochemical Behavior of Nickel Monosilicide in Alkaline Electrolyte. Shein, A.B.; Sergeeva, I.L. // Protection of Metals;Nov/Dec2004, Vol. 40 Issue 6, p556 

    Corrosion-electrochemical behavior of compact and powder electrodes of nickel monosilicide (NiSi) and pure Ni and Si in 0.1–5.0 M NaOH solutions is studied by using steady-state and cyclic voltammetry. The main regularities of NiSi anodic dissolution are revealed. It is shown that, in...

  • Mercury(II) Extraction Using a Poly(3,4-Ethylenedioxythiophene) Modified Electrode. Arteaga, G. C.; Del Valle, M. A.; Antilén, M.; Faundez, M.; Gacitúa, M. A.; Díaz, F. R.; Bernède, J. C.; Cattin, L. // International Journal of Electrochemical Science;Nov2011, Vol. 6 Issue 11, p5209 

    Poly(3,4-ethylenedioxythiophene), PEDOT, electro-obtention has been widely studied because of its variety of applications. One of its most relevant electrochemical characteristics is its ability of p- and n-doping (an almost unexplored property thus far), consequently in the present survey its...

  • Comparative Study on Rate of Flow Accelerated Corrosion (FAC) of API 5L X-52-65-70 Steels in a Brine added with H2S at 60°C by Using a Rotating Cylinder Electrode (RCE). Cervantes Tobón, A.; Díaz Cruz, M.; González Velázquez, J. L.; Godínez Salcedo, J. G.; Macías Salinas, R. // International Journal of Electrochemical Science;2014, Vol. 9 Issue 12, p6781 

    This work focuses on how important the hydrodynamic conditions are on the corrosion rates occurring in steel type API 5L grades such as X52, X65 and X70 when are exposed to synthetic brines with and without H2S at 60°C. Experiments were conducted using a rotating cylindrical electrode (RCE)...

  • Environmental and inherent factors that affect hydrogen cathodic evolution on silicides of the iron family metals. Povroznik, V.; Shein, A. // Protection of Metals;Mar2007, Vol. 43 Issue 2, p203 

    Scientifically proven search for new electrode materials with different functions is an actual problem of applied electrochemistry. Promising are intermetallic and metal-like compounds of various composition, a lot of which exhibits extremely high corrosion resistance and low hydrogen overpotential.

  • New corrosion-resistant electrodes: Synthetic diamond and diamond-based materials. The semiconductor and structure aspects—a review. Pleskov, Yu. // Protection of Metals;Mar2006, Vol. 42 Issue 2, p103 

    Specific features of electrode behavior of synthetic diamond and diamond-based materials (in particular, diamond-nondiamond carbon nanocomposites, nanocrystalline diamond, and diamond-like carbon) are reviewed. Effects of the crystal structure and semiconductor nature of diamond on its...

  • Effect of Magnesium Hydride on the Corrosion Behavior of Pure Magnesium in 0.1M NaCl Solution. Xu, Shanna; Dong, Junhua; Ke, Wei // International Journal of Corrosion;2010, p1 

    The effect of magnesium hydride on the corrosion behavior of pure magnesium in 0.1M NaCl solution was investigated using the gas collection method, potentiostatic current decay test, and in situ Raman spectrum. The formation of magnesium hydride (MgH2, Mg2H4) was observed at the cathodic region....

  • Index to Volume 33 (2003).  // Journal of Applied Electrochemistry;Dec2003, Vol. 33 Issue 12, p1247 

    The article presents a subject index of terms related to electrochemistry. Some of the topics mentioned in the index are, corrosion behaviour of tantalum in sodium hydroxide solutions; inhibition of acid corrosion of steel using cetylpyridinium chloride; protection of copper corrosion by...

  • Electrode materials for cathodic corrosion protection systems for ships and marine constructions. Kuz'min, Yu. L.; Troschenko, V. N.; Medyanik, T. E.; Laschevskii, V. O.; Sedel'nikov, N. G. // Russian Journal of General Chemistry;Oct2010, Vol. 80 Issue 10, p2143 

    Materials for systems of cathodic corrosion protection of courts and technologies of their production are reviewed. It is shown that the most perspective are platinum-niobium anodes with a nanostructured platinum coating set in a high-strength press material on the epoxide basis, coated with...

  • Self Linear Polarization Resistance-Theory and Examples. Klassen, R. D.; Roberge, P. R. // Journal of Applied Electrochemistry;Jul2004, Vol. 34 Issue 7, p723 

    Measuring the corrosion rate of a corroding metal is of interest in many situations, including monitoring industrial processes and undertaking fundamental research. The corrosion rate of a metal can be measured electrochemically by determining its polarization resistance, which is inversely...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics