KINETICS OF AUROCYANIDE LOADING WITH AN ANION EXCHANGE RESIN.

J. B. Hiskey; A. O. Ette

KINETICS OF AUROCYANIDE LOADING WITH AN ANION EXCHANGE RESIN.

J. B. Hiskey, A. O. Ette

Mining and Geological Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Scopus citations

Abstract

Synthetic ion-exchange resins offer an attractive alternative to carbon for the recovery of gold from alkaline cyanide solutions. This paper describes an investigation of the kinetics of loading gold onto a new weak-base resin (PAZ-4) designed specifically for gold and silver cyano anions. The uptake of gold was determined at temperatures from 25 degree C to 450 degree C, pH's from 8. 5 to 11. 5, and free cyanide concentrations from 0. 20 g/l to 0. 80 g/l. The adsorption rate increases strongly with decreasing pH and to a lesser extent with increasing free CN** minus concentration. Temperature was observed to have very little effect on the loading kinetics. The initial loading kinetics obey a shell-progressive (shrinking core) diffusion mechanism and can be explained mathematically by the classical diffusion equation for spherical particles. An exchange mechanism involving reaction between aurocyanide and hydrogen cyanide is proposed to explain the results.

Original language	English (US)
Title of host publication	Unknown Host Publication Title
Publisher	Metallurgical Soc of AIME
Pages	295-310
Number of pages	16
ISBN (Print)	0873390539
State	Published - Dec 1 1986

ASJC Scopus subject areas

Engineering(all)

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Hiskey, J. B., & Ette, A. O. (1986). KINETICS OF AUROCYANIDE LOADING WITH AN ANION EXCHANGE RESIN. In Unknown Host Publication Title (pp. 295-310). Metallurgical Soc of AIME.

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N2 - Synthetic ion-exchange resins offer an attractive alternative to carbon for the recovery of gold from alkaline cyanide solutions. This paper describes an investigation of the kinetics of loading gold onto a new weak-base resin (PAZ-4) designed specifically for gold and silver cyano anions. The uptake of gold was determined at temperatures from 25 degree C to 450 degree C, pH's from 8. 5 to 11. 5, and free cyanide concentrations from 0. 20 g/l to 0. 80 g/l. The adsorption rate increases strongly with decreasing pH and to a lesser extent with increasing free CN** minus concentration. Temperature was observed to have very little effect on the loading kinetics. The initial loading kinetics obey a shell-progressive (shrinking core) diffusion mechanism and can be explained mathematically by the classical diffusion equation for spherical particles. An exchange mechanism involving reaction between aurocyanide and hydrogen cyanide is proposed to explain the results.

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