Process of Extraction of Gallium from Technological Solutions with the Use of Ion Exchange Resins

Metallurgist - D-403 weakly basic anion exchange resin is used for the sorption extraction of gallium in the form of hydroxo complexes from alkaline aluminate solutions. The thermodynamic...     

Sorption recovery of gallium and aluminum from alkaline solutions on an AN-31 anion exchanger

Sorption of aluminum and gallium in the form of hydroxo complexes on a weakly basic AN-31 anion exchanger at 298 K from model solutions is investigated. Based on the experimental data, the forms of ions sorbed by the solid phase of the anion exchanger are determined. Sorption of pentahydroxy aluminate and pentahydroxy gallate ions occurs in the Stern–Helmholtz layer. Apparent constants and Gibbs energies of ion-exchange reactions are calculated. The values of the total exchange capacity of gallate ions of 55–58 g/kg in static conditions determine the use of an AN-31 anion ex change resin during the concentration of gallium ions from alkali aluminate solutions.     

Low-firing binders from magnesium containing carbonate raw materials

This paper presents scientific and experimental data for low-firing hydraulic binders: hydraulic lime and Roman cement based on local mineral raw materials. The binders were prepared by firing representative samples of carbonate–clay magnesian raw materials from Tatarstan. Using X-ray diffraction, we identified the firing products, including a hydraulically active phase, and determined the structural characteristics of its minerals. The compositions of the binders were determined as functions of firing conditions. We examined the influence of the firing temperature and duration of magnesian raw materials in the preparation of binders on MgO activity and demonstrated for the first time the possibility of ensuring an active state of the MgO resulting from firing (up to 21%) and suppressing its negative effect on Roman cement and hydraulic lime hardening processes.     

Determination of critical SW reflection parameters in powder composite materials

Novosibirsk. Translated from Fizika Goreniya i Vzryva, Vol. 25, No. 1, pp. 82–88, January–February, 1989