T. N. Matveeva

New complexing agents to select auriferous pyrite and arsenopyrite

The authors propose the process for selective flotation of auriferous pyrite and arsenopyrite, where the combination of xanthate, 2-hydroxylpropyl ester of diethyldithiocarbamate acid (HPEDEDCA) and oak-bark extract (OBE) is used to produce pyrite concentrate recovered into the froth product. The process provides the selective recovery of valuables into heteronymous concentrates, thus reducing the irrecoverable valuable component loss by 5–7 %. The complexing capacity of HPEDEDCA to gold is experimentally proved and allows using it as a selective collector of auriferous iron sulfides. The use of OBE to depress iron sulfides and arsenic in flotation of multicomponent ores contributes to higher flotation selectivity and grade of heteronymous concentrates.

Composition of multicomponent heracleum extracts and its effect on flotation of gold-bearing sulfides

Using the proprietary method, the authors have obtained flotation agent BO—extract of atomized leaves and stalks of Heracleum sosnowskyi (hogweed), and analyzed its composition. Qualitative tests, thin-layer chromatography (TLC), ultraviolet spectrophotometry and flotation tests show that aqueous and organic extracts contain substances that differ in chemical and process properties. The article gives test results for aqueous, alcoholic and aqueous–alcoholic extracts BO used as modifiers in chalcopyrite and pyrite flotation. Selective properties of aqueous and aqueous–alcoholic extracts BO are characterized. The highest depression ability relative to pyrite is a characteristic of aqueous BO extract obtained at pH = 3, with heating and treatment in ultrasonic bath. Organic extracts contain mostly furocoumarins, aspic oils and resins, and have no material effect on flotation activity of pyrite.

Innovative technologies and extraction of commercial components from unconventional and difficult-to-process minerals and mining-and-processing waste

The technological capability of extraction of platinum from zonal basic-ultrabasic dunite ore is theoretically stated and experimentally proved. The article describes development of new selective complexing agents meant for extraction of sulfide minerals with emulsion gold shots. The authors also inform on a method and regimes of extra sulfur removal and platinum group metal extraction from final rejects at the Talnakh copper-nickel preparation plant with a view to their further introduction in backfilling mixtures as binding components.

Analysis of adsorption of phytogenous collecting agents at the gold-containing sulfides during flotation

The article presents research findings of testing adsorption of phytogenous collecting agents at the surface of gold-containing pyrite and arsenopyrite using UV spectroscopy, as well as analytical scanning electron, laser and atomic force microscopy methods. It is found that components of extracts of oak bark and umbelliferous plant foliage are selectively adsorbed at the sulfide mineral surface, which enables selective flotation of pyrite and arsenopyrite in gold-bearing sulfide ore dressing.

Physicochemical effect of modified diethyldithiocarbamate on the surface of auriferous sulfide minerals in noble metal ore flotation

Complexing processes between modified diethyldithiocarbamate (DDC) and copper, iron and gold ions in solution, as well as adsorption of modified solution on auriferous pyrite and arsenopyrite are analyzed using the ultraviolet spectroscopy, scanning electron and laser microscopy. The research shows that modified DDC forms partial water soluble compounds with gold and is selective towards auriferous pyrite and arsenopyrite as compared to xanthate.

Scientific grounds for high-performance agent modes in platiniferous sulfide mineral flotation from rebellious ores

The author substantiates the choice of new selective agents PTTC, HPEDETC, and Hostaflot M-91 to float platiniferous sulfide minerals from rebellious ores. The study agent modes imply the use of PTTC, being a component of modified xanthate and providing 6–7% increase in recovery of copper, nickel, and PGM in flotation of the low-sulfide platiniferous copper-nickel ore from the Fedorovo-Pansky deposit. The substitution of HPEDETC and Hostaflot M-91 for xanthate makes it possible to increase recovery of platinum by 5.7–13%, palladium by 4–9% and 2–4 times the noble metal content in the flotation concentrate.

Investigation into Products of Dimethyl Dithiocarbamate and Xanthate Sorption on Sulfide Minerals of Copper-Nickel Ores

The mechanism of interaction of sodium dimethyl dithiocarbamate and xanthate with the surface of pentlandite and pyrrhotine is investigated. The basic forms and features are determined for the forming surface compounds on flotation.

Effect of Tannin on Compound Collector Adsorption and Stibnite and Arsenopyrite Flotation from Complex Ore

Using the scanned laser microscopy, the new experimental data on the influence exerted by a phytomodifier represented by tannin on adsorption of a compound collector represented by modified sodium diethyl dithiocarbamate at arsenopyrite and stibnite were obtained, which allowed substantiating the method of selective production of antimonic concentrate from complex gold-bearing arsenide ore by new reagents and enabled the optimized selection of reagent regimes.

Mechanism of Interaction of Cloud Point Polymers with Platinum and Gold in Flotation of Finely Disseminated Precious Metal Ores

ABSTRACT Prospects of the application of new class of reagents - cloud point polymers with functional groups on the gold and platinum for extraction of micro- and nanoparticles of noble metals from fine grinded ores and by-products were considered. The reaction of synthesis of cloud point copolymer on the basis of N-isopropylacrylamide and N-acryloxysuccinimide, and its subsequent modification by groups of thioamine (TMPA), semicarbazide up (TMPB) and phosphine (TMPPh) were presented. Selective interaction of reagents TMPA, TMPB and TMPPh with noble metals and their prospective use as effective flocculants and reagents-collectors in flotation of refractory gold and platinum ores was revealed.

Electrochemical polarization effect on surface composition, electrochemical characteristics and adsorption properties of pyrite, arsenopyrite and chalcopyrite during flotation

The article presents experimental research of the influence exerted by electrochemical polarization on electrode potential, phase composition of surface compounds, adsorption of collector and floatability of basic sulfides of gold-bearing ore. It is shown that phase composition of surface compounds generated under different polarization modes affects adsorption of collectors and floatability of minerals.