To the question of the intensification of the processes of uranium extraction from refractory raw materials

Recently, one of the main directions for increasing the extraction of uranium from difficult-to-hide ores is the use of intensifiers, which allow the most complete transfer of uranium from one valence state to another. In the article, the catalyst “M-1”, which is a compound of transition metals, is considered as an intensifier. Comparison of the kinetic dependencies of the sorption extraction of uranium by the ionites from the productive solutions of leaching of uranium-bearing ore in the presence of the “M-1” catalyst showed that they differ insignificantly. The possibility of sorption of uranium from productive solutions by natural sorbents in comparison with synthetic sorbents is investigated

Recovery of precious and non-ferrous metals from the rebellious complex of mineral raw materials

The results of comprehensive researches aimed to develop the advanced technology of rebellious refractory minerals and ore processing are given in this paper. Some ways in solving the most challenging technological problems associated with complex ores enrichment and hydrometallurgical processing to recover precious and non-ferrous metals, biochemical leaching inclusive, as well as recommendations on processing of leaching solutions aimed at valuable components recovery are proposed. Effects of reagent X on dissolving the non-ferrous and precious metals as well as the associated elements from refractory ore, concentrates and metallurgical production wastes are shown. Reagent X promotes metal leaching through a control of oxygen regime of leaching process. Reagent X, capable to form readily soluble metals hetero-complexes, plays a prominent part. Beneficial effects of reagent X on the mineral polarizing processes in alkali-cyanides media were found. Reagent X pretreatment enhances metals recovery into solution by 20-30 % depending on the process time. Process of Au, Cu, Zn etc., dissolving from rebellious gold-bearing raw materials was studied through the use of unique microorganisms strain; there are identified chemo-physical regularities of chemical leaching process, and the innovation technology of chemical leaching of gold-containing materials was developed

Gold and Silver Extraction from Leach Solutions

There has been carried out an investigation on the extraction of gold and silver from thiosulfate solutions: standard test and technological solutions of chemical and electrochemical leaching. The influence of related metals on the process of extracting gold from solution was studied. There has been conducted a comparative study of the IR spectra of solutions after the sorption of gold, silver and related metals

The main reasons for increased copper losses with slags from vanyukov furnace

The article examines the factors affecting to the loss of copper with slags during autogenous smelting of copper concentrates at the Balkhash copper smelting plant (BCP). The composition of concentrates processed in the Vanyukov furnace was analyzed. Slag formation during alloying FeO with ores containing approximately the same amount of SiO2 was studied. The fluxing ability of silicate ore used in charge smelting at BCP has been determined. A scanning electron microscope (SEM) was used to study the distribution of elements in the slag and the main reason for the low fluxing ability of the ores used at BCP was revealed

Intensification of copper leaching from heaps using biological oxidation

The article presents the results of experiments intended to leach copper from ore heaps of complex mineral composition biochemically. The processing of such heaps is complicated due to the presence of oxidized copper minerals among significant fragments of sulfide minerals and iron-calcium silicates. This factor does not allow to perform standard sulfuric acid leaching effectively without the use of additional oxidation catalysts, or to apply beneficiation methods for that kind of raw materials. Use of A. Ferrooxidans bacteria adapted to the composition of the copper dump, as a bio-catalytic agent, significantly accelerates the leaching process and increases the copper recovery degree into the productive solution

A study of the biohydrometallurgical method for extracting gold from flotation tailings

This paper shows the results of the comparative study of efficiency of gold extraction methods from technogenic flotation tails by agitation cyanidation and biooxidation followed by leaching. A representative sample of flotation tails was taken at gold extraction plant of Altyntau Kokshetau LLP. Experimentally, an increase in the efficiency of leaching gold from flotation tails during preliminary bacterial oxidation was found. By biochemical leaching, 72 % was extracted, which is 7 % more than using expensive sodium peroxide and 10 % more than using the traditional method of cyanidation

Research on sorption properties of phosphoric production slag-waste

On the territory there are phosphorus-containing wastes - phosphorus slags, the basis of which is volostanite. The study of phosphorus slag as a uranium sorbent is of theoretical and practical interest. In the course of the research, comparable data were obtained on the sorption of the initial and activated slag by different reagents. The optimal conditions for the activation of phosphorus slag in order to increase its sorption properties have been determined

A Comparison of the Returns of Oil and Energy Companies Quoted in Kase and the Returns of the Kase Index, Exchange Rate, and Selected International Energy Indices

The positive steps taken since the beginning of the 2000s have brought Kazakhstan's economy ahead of its peers. Making this economic growth sustainable depends on the correct determination of the interaction between economic instruments. Therefore, we aim to determine the relationship between the returns of oil and energy companies traded on the Kazakhstan Stock Exchange (KASE) and the returns of the KASE index, exchange rate, and selected international energy indices. The data were analyzed using the VAR method. Our analysis showed that the two-period lagged value of the KZTO variable, the one-period lagged return of the KASE index in the KZAP variable, the two-period lagged return of the dollar exchange rate and the two-period lagged return of the KZAP in the KEGC variable have positive effects. On the other hand, one-period lagged return of the FTSE CNBC Asia 100 Oil & Gas index, one-period, and two-period lagged return of the ruble return, and one-period lagged return of the Dow Jones Islamic Markets Oil & Gas index were found to have negative effects

Intensification of copper leaching from heaps using biological oxidation

The article presents the results of experiments intended to leach copper from ore heaps of complex mineral composition biochemically. The processing of such heaps is complicated due to the presence of oxidized copper minerals among significant fragments of sulfide minerals and iron-calcium silicates. This factor does not allow to perform standard sulfuric acid leaching effectively without the use of additional oxidation catalysts, or to apply beneficiation methods for that kind of raw materials. Use of A. Ferrooxidans bacteria adapted to the composition of the copper dump, as a bio-catalytic agent, significantly accelerates the leaching process and increases the copper recovery degree into the productive solution