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The conductivity of aqueous zinc chloride reaches a maximum of 10.7 Ω−1 m−1 at 3.7 M ZnCl2. Measurements on chlorinated ZnCl2 showed that at low chlorine concentrations, the conductivity increased linearly with the square root of the chlorine concentration. The increase was due to the three...
The effect of polyox and CMC drag-reducing polymers on the rate of mass transfer in a parallel-plate flow cell was studied by measuring the limiting current for the cathodic reduction of potassium ferricyanide in alkaline medium. Reynolds number and polymer concentration were varied over the...
The results of linear sweep experiments on lead in 1 M sulphuric acid solutions with and without saturation by an organic lignosulphonate (expander) have shown that one mode of expander action is to change the mechanism of current limitation in the passivation process.
The effects of various organic additives: Pearl glue, Separan NP10, Percol 140 and tetraalkylammonium chlorides, on zinc deposit morphology and orientation and on the current efficiency and energy requirement for zinc electrowinning from chloride electrolyte have been determined and compared....
Design and performance characteristics of a high-rate D-cell and a super-high-rate flat cell, three inches in diameter and less than an inch high, are discussed. The flat cell had a short-circuit current of 1500 A and delivered approximately 20 A h on a 20 A continuous or pulse mode. The cell...
Exploratory experiments with three types of redox fuel cells utilizing the VO
/VO2+-Fe2+/Fe3+ and VO
/VO2+-Cu/Cu2+ redox couples are reported. The results show the major features and problems, and suggest possible solutions to some of the problems associated with...
The process of incorporation of zinc into a copper cathode has been experimentally studied in a molten salt system at 381±2° C and at various current densities. The process is shown to be kinetically controlled by the diffusion of Zn into the solid matrix. A galvanostatic pulse titration...
The theory of metal deposition in a bipolar trickle tower is reviewed briefly and applied to the scavenging of copper, silver, lead and calcium from dilute streams. Measurements of reference potential and mass-transfer coefficients for the copper system in one tower allow estimates ofθ
The direct and indirect oxidation of cyanide at concentrations typical of those found in plating wash water have been investigated in a bipolar trickle-tower reactor. It has been found that the oxidation by hypochlorite generatedin situ was faster than direct oxidation or oxidation in the...
The destruction of CN− and co-deposition of copper, cadmium, nickel, zinc and lead, both as simple solutions and as mixtures, have been investigated in a number of trickle towers with from 8 to 49 layers of cells. Specific chemical effects due to the formation of cyano-complexes of some of the...
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