Extraction of Chloro Complexes of Copper and Silver from Nickel Chloride Solutions
- PDF / 126,857 Bytes
- 5 Pages / 595.22 x 842 pts (A4) Page_size
- 103 Downloads / 220 Views
NOLOGY OF INORGANIC SUBSTANCES AND MATERIALS
Extraction of Chloro Complexes of Copper and Silver from Nickel Chloride Solutions L. V. Dyakovaa, *, E. S. Kshumanevaa, and A. G. Kasikova aTananaev
Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Science Center, Russian Academy of Sciences, Apatity, Murmansk oblast, 184209 Russia *e-mail: [email protected] Received June 1, 2018; revised June 8, 2018; accepted June 11, 2018
Abstract—Investigations into the recovery of copper(II) and silver(I) by liquid extraction with individual extractants and mixtures based on tertiary amine from nickel chloride solutions have been carried out. The influence of the modifier type, chloride background, extractant concentration, and the ratio of aqueous and organic phases on the extraction process is found. Keywords: silver, copper, nickel, leaching-out, extraction recovery, modifier, extractant DOI: 10.1134/S0040579520040065
INTRODUCTION When switching to the hydrochloride processing of nickel raw materials, concentrated nickel solutions are produced that contain cobalt, copper, iron, and a small amount of metal-impurities (including silver), and this demands its isolation from solution [1]. Numerous methods for recovering silver from solutions are known: electrolysis, settling, flotation, ion exchange, adsorption, solid phase extraction, electrocoagulation, cementation, biosorption, and extraction [2–11]. On an industrial scale, settling methods and sorption purification are predominately used for silver recovery. Extraction processes have a number of advantages over methods of sorption, sedimentation, and other methods purification and separation. The main meritoriousnesses of extraction are high selectivity and separation purity; the possibility of operating with both large and small concentrations; the readiness of processing and facilities; the possibility of achieving a continuous process, automaticity; and, finally, high productivity. These features make the extraction process promising different industrial branches. However, in the presence of copper, which is capable of forming depending on the conditions of chloro complexes of different compositions [12, 13], the extraction isolation of silver is complicated; consequently, the problem of their separation arises. Many investigations have been dedicated the extraction of Сu(I)/(II) and its separation from ions such as Fе(III) and Со(II) in chloride solutions [14– 17], and the selective extraction recovery of Ag(I) from such media needs more careful study.
To extract Ag(I) from chloride solutions, different organophosphorus compounds [17–19]; amines; and organic compounds including P, S, N calyx[n]arenes and macrocyclic compounds were used [20, 21]. Most of these extractants differ by complex synthesis, have weak extraction properties with respect to silver, or their regeneration for repeated use is impossible; therefore, it is necessity to source effective extraction systems for the selective recovery of silver from solutions. EXPERIMENTA
Data Loading...
