The state of gold deposited from a chloride solution on the surface of the porous magnetite-carbon composite obtained from modified birch saw dust at 400 and 800°C was studied by electron microscopy, X-ray photoelectron spectroscopy, and XRD analysis. The shape and size of the deposited gold crystallites depend on the synthesis temperature of the composite. The deposited gold crystallites were mainly ray-shaped at the synthesis temperature of 400°C and spheroid at 800°C.

The processing of refractory sulfide black-shale ores and concentrates from the Sukhoy Log deposit containing gold, silver and platinum group metals (palladium and platinum) was investigated. The noble metals were leached both under atmospheric pressure and at 700kPa at 200°C in an autoclave. It was found that the preferred leaching method is the chlorination of the ore in HCl/NaCL solutions in the presence of MnO2. The sorption recovery of noble metals on Purolite anion exchangers and carbon adsorbent Calgon GRC-22 was carried out from solution with the following initial concentrations of noble metals (in mg/L): Au — 25; Pt — 5; Pd — 5; and Ag — 10 in the presence of 1M FeCl3, 0.1 М CuCl2, 1M NaCl and 1М HCl. It was shown that the chloride complexes of noble metals can be effectively adsorbed from this solution. Then, the selective elution of noble metals from anion exchangers Purolite A170 and Purolite S992 by means of different complex-forming reagents was studied. The best elution results were obtained with Na2SO3+NaNO2 and thiourea solutions.

An extraction-pyrolytic technique and its usage for obtaining pure products from secondary manufacturing solutions are considered in this paper. Nanostructure ferrite thin films were prepared using the extraction-pyrolytic technique. It was shown that the extraction from modeling liquid of waste solution allows obtaining the pure single phase product. Fe2CoO4 magnetic films with grain sizes 18-20 nm were obtained by cycling pyrolysis of wet films deposited by the spin coating technique.

The process of deposition of gold from an aqueous solution of hydrogen tetrachloroaurate(III) on microporous composites synthesized from a blend of sawdust, iron and zinc chlorides was examined. Their high sorption capacity for gold was shown, one reason of which is the interaction chloroaurate ions with iron oxide.

The extraction pyrolytic method is used to fabricate thin (100–300 nm) films of the lanthanum manganites La0.7Sr0.3MnO3 on fused silica substrates. The films are deposited on the substrate using the alternate sessions of the centrifuging of solution and pyrolysis. The annealing of thin films at temperatures of greater than 650°C yields the single-phase La0.7Sr0.3MnO3 material. It is demonstrated that the annealing temperature substantially affects the magnetic properties of the resulting films: the films exhibit the properties of spin glasses and ferromagnetic properties at temperatures of less than 700°C and greater than 700°C, respectively.

Behavior of silver sulfide in the system Ag 2 S-Fe(NO 3 ) 3 -HNO 3 -H 2 O was studied at 25, 55, and 80°C using the method of the simplex-lattice experiment design. The quantitative dependences of Ag 2 S oxidation on the concentrations of the acid and Fe 3+ were determined. The isoconcentration diagrams were obtained.

A new method for the synthesis of [Pt2(NH3)4P2O7] is proposed. Its transformations in a hydrochloric acid medium are described.

Synthesis of electrolytic manganese dioxide on a heated anode was studied. The specific energy of chemical power cells fabricated using this dioxide in the Zn-Mn system is as high as 100 W h kg −1 .

Nanocrystalline tin oxide films were obtained on glass and metal substrates by immersing into the solution of tin carboxylate, centrifuging of the substrate with the solution, followed by thermal treatment. A distinguishing feature of the proposed method is the use of extraction for the synthesis of precursors, which allows us to obtain the precursor material free from any impurities. It was established that the sensitivity of tin oxide films to the gases depends on pyrolysis temperature and is maximal for the films pyrolyzed at 400 degrees C.

Results of investigations into reextraction of Pt, Ir, Rh and Ru from organic sulphides by water solutions of a number of reagents by the action of the ultra-violet (UV) light have been presented. It has been demonstrated that the UV light has a pronounced effect upon the reextraction of platinum metals. Separating of Rh and Ru from Pt and Ir by a muriatic acid solution of sodium and ammonium nitrates and rongalite has been performed. The UV light irradiation of a system of an extract of organic sulphides and muriatic acid makes it possible to separate iridium from the other platinoids and to reextract rhodium selectively by a sodium hi pochlorite solution. The activation mechanism of the reextraction process upon irradiation by the UV light is discussed, which consists in a labilization of the complexes and in the reduction of a central atom to lower oxidation states.

The composition of platinum-group metal complexes formed in extraction with organic sulfides has been studied using IR, UV, and H-1 NMR spectroscopy. Elemental analysis data indicate that, in extraction with dipropyl sulfide (DPS), the complexes RhCl3.3DPS, IrCl3.3DPS, and RuCl3.3DPS have been formed in the organic phase regardless of HCl concentration, temperature (20-100degreesC), and metal oxidation state. The complex PtCl2.2DPS has been formed in the extraction of either Pt(II) (T = 20degreesC) or Pt(IV) (T = 80degreesC).

The influence exerted by mechanical activation of electrolytic manganese dioxide under conditions ensuring insulation of the system from a reducing agent on parameters of chemical batteries based on the Zn-MnO 2 electrochemical system was studied.

The influence exerted by mechanical activation of electrolytic manganese dioxide under conditions ensuring insulation of the system from a reducing agent on parameters of chemical batteries based on the ZnMnO2 electrochemical system was studied.

Solubility of lead nitrate in the system H 2 O-Zn(NO 3 ) 2 -HNO 3 was studied using the simplexlattice design method. The equations describing the effect of nitric acid and zinc nitrate concentrations on the content of lead nitrate in solution at 25 and 55°C were derived.