Sorption Recovery of Platinum Metals from Production Solutions of Sulfate-Chloride Leaching of Chromite Wastes

Abstract

This paper discusses the scientific rationale for methods of platinum metals sorption centralization from saturated solutions with a high content of macrocomponents. Methods of sorption centralization of platinum and iridium using local anionites such as AH-31, AB-17-8, Purolite S985 are described. The sorbents used were conditioned to remove organic and mineral impurities. The sorption isotherms of platinum group metals 1/EC=f(1/Cp) at a temperature of 20 °C and a duration of 24 h were plotted. The data on the sorption recovery of platinum and iridium from individual and combined sulfate-chloride solutions were determined. Isotherms of iridium sorption from sulfate-chloride solution are formed. Results of the apparent sorption equilibrium constant and values of standard Gibbs energy (ΔG, kJ/mol) of ion exchange for sorption of platinum and iridium from individual and combined sulfate-chloride solutions are presented. Linearized isotherms and kinetic curves of joint sorption of platinum and iridium from sulfate-chloride solution are described. Comparative sorption of the platinum-group metals (PGM) by anionites AB-17-8 and Purolite S985 from sulfate-chloride solutions is shown. The sorption diagram of platinum and iridium from sulfate-chloride product solutions is presented. It has been revealed that complete recovery is achieved using chelation ion-exchange resin Purolite S985, with recovery of Pt up to 95% and Ir more than 73%. The sorption process is accompanied by intradiffusion constraints that are confirmed by the analysis of kinetic curves using Schmukler and Boyd–Adams models.

Application of the Organic Waste-Based Sorbent for the Purification of Aqueous Solutions

“…According to the results obtained, the true density of the initial material was 2.277 g/cm 3 , and the density of the washed material was 2.007 g/cm 3 . The bulk density was 703.786 g/cm 3 .…”

“…where m 1 -empty pycnometer mass, g; m 2 -mass of pycnometer with sample, g; m 3mass of pycnometer with sample and water, g; m 4 -mass of pycnometer with water, g; ρ aq -water density. The true density of the material was determined in parallel for two samples with an error of not more than 0.01 g/cm 3 and calculated as the average of these determinations.…”

“…The use of by-products or secondary resources of the main technological lines, particularly for the effective purification of large-capacity wastewater from heavy non-ferrous metals and organic pollutants using inexpensive sorption technology, remains a crucial task [3,4]. Commercially available sorbents that are used to address these problems are mainly natural materials such as active carbon materials, biochar and zeolites [5][6][7].…”

Impact of Neodymium and Scandium Ionic Radii on Sorption Dynamics of Amberlite IR120 and AB-17-8 Remote Interaction

“…It is used in softening technology and in water demineralization. Differs in good osmotic stability, high chemical resistance to alkalis, acids, oxidizing agents, insoluble in water and organic solvents [ 30 , 31 , 32 , 33 , 34 ].…”

Effective Sorption of Europium Ions by Interpolymer System Based on Industrial Ion-Exchanger Resins Amberlite IR120 and AB-17-8

“…The strong base is subdivided into strong and weak acid anions. Weak electrolyte ion exchangers exchange their ions within narrow pH ranges; cation exchangers—in an alkaline environment, anion exchangers—in strongly acidic and only for strong acid anions [ 25 , 26 , 27 , 28 ].…”