L. G. Shumskaya

Directional Changes in the Properties of Aluminum Hydroxide-Oxides for Increase in Bauxite Reactivity in Hydrometallurgical Processing

Structural and chemical modifications of the essential Al-containing minerals of bauxite ores - boehmite and diaspore - are examined in the processes of mechanochemical preparation for opening. It is established that the violations changing the character of hydroxide bond and the reactivity of mineralogical bauxite components decrease under mechanical activation in the agrAl(OH)3-ggrAlOOH-agrAlOOH series. The possibilities are considered for intensifying Al2O3 extraction in leaching.

Flotation behavior of sulfides on mechanical activation

Mechanical activation during grinding affects the flotability of pyrite, arsenopyrite, and galena. It is established that the S, Fe, and As atoms at the surfaces of the initial materials are mainly in the oxidized state. The transformations occurring on the surfaces of mechanically activated sulfide minerals are the cause of the changes in flotability.

Control of Cation-Exchange Interaction between Zeolites and Phosphates on the Basis of Soft Mechanochemical Activation

The behavior of clinoptilolite-phosphorite mixtures in the citric-acid medium and the influence exerted by mixture composition on kinetics of extracting P2O5 into 2% citric acid solution are investigated. It is established that as the zeolite : phosphorite mass ratio grows, the content of citric-soluble P2O5 increases in the mixtures, and the preliminary soft mechanochemical activation of phosphorite raises extraction of phosphorus to the acid media by a factor of 10-15. This favors the solution of agrochemical problems using zeolite-phosphate mixtures of different composition.

State and perspectives of natural zeolite beneficiation

The efficiency is studied and evaluation is made of the principal methods of concentration of zeolite raw materials, the essential features of which consist in the use of difference in the structure, particle size, density, and magnetic susceptibility of the minerals. A scheme is proposed for magnetic-gravity concentration of zeolites of the Shivyrtuisk deposit.

Controlled changes in technological properties of phosphates in mechanical activation with zeolites

A study has been made of the solid-phase mechanochemical modification of the natural zeolite-clinoptilolite by calcium phosphate in grinding equipment of increased energy intensity. It is shown that the extraction of phosphorus into a citric acid solution is very nearly unchanged as the intensity of mechanical actions is increased. Feasibility has been established for controlled change in the ratio of water-soluble and agrochemically active citric-soluble forms of P2O5.

Analysis of material composition and dissociation potential of minerals in mine waste to assess productivity of lithium concentrates

Considering lack of lithium, the authors believe it is advisable to analyze dressability of spodumene concentrates from mine wastes, specifically from tailings of Transbaikal Mining-and-Processing Integrated Works. The analysis includes mineral chemical, and grain-size compositions of raw material, as well as the capacity of spodumene to be separated and recovered. These characteristics make the basis for developing the dressing technology and process flowsheet for the indicated type of technogenic (i.e. resulted from production activities) deposits.

Beneficiation and Physico-Chemical Properties of Chabasite as One of the Perspective Types of Transbaikalia Zeolites

A scheme is proposed for concentration of zeolite-bearing basaltoids of the Margintuisk volcanic field of Transbaikalia, and a comparative investigation into physico-chemical and adsorption properties of synthetic and natural chabasite recovered from the basalts is conducted. It is shown that the chabasite concentrate extraction is possible with the use of sufficiently simple scheme of electromagnetic concentration. It is established that despite some differences in physico-chemical characteristics, the adsorption properties of natural chabasite are not inferior to the properties of synthetic analog.