Sorption Purification from Strontium of the Mazuevskoye Deposit Celestine Ores Waters by Manganese Oxides (III, IV) Ion Exchanger
Saenko, Ekaterina; Valtsifer, Viktor
Perm Federal Research Center of the Ural Branch of the Russian Academy of Sciences, Russian Federation
At present, the problem of selective extraction of water from the strontium in mining areas is becoming more urgent. First of all, this is due to the involvement in the drinking water supply of large volumes of aquifer water with Sr2+ content 5-20 times higher than the maximum permissible value. In the Perm region, seven strontium objects are known, five occurrences in groundwater, one occurrence in the Lower Permian sediments and one large Mazuyevskoye field. In connection with the possible development of this field there is a problem of contamination of groundwater and surface water with strontium. Currently, there is already an increased Sr2+ content in natural waters. Prolonged use of such water leads to the development of morbidity among the population. On the other hand, in order to increase the utilization of the Mazuevskoye field when opening aquifers, it is advisable to treat the underground waters as an independent potential hydro-mineral source of strontium (the content of strontium reaches 24% of the total reserves in the Earth's crust). Therefore, there is a need to involve mine waters in the processing cycle. It should be emphasized that groundwater is a special approach because it is both a valuable hydromineral raw material, waste mining industry and an agent of environmental pollution. Considering this, it is necessary to foresee efficient technologies for the extraction of strontium from natural waters. The most effective method in a particular field (the presence of a large amount of calcium and magnesium salts) is ion exchange using highly selective ion exchangers based on manganese oxides (III, IV). In work on the basis of similar samples of manganese oxides (III, IV) with the structure of bernessite, purposefully changing the doping ions in their composition, inorganic ion exchangers selective for strontium ions were synthesized.
Tests of samples of ion exchangers under dynamic and static obtained under optimal conditions, showed their consistently high selectivity to strontium ions from solutions with a high content of competing ions (Na+, Ca2+, Mg2+).
The results of the study allowed us to develop methods for the controlled synthesis of manganese oxides (III, IV) with enhanced stability and improved sorption-kinetic properties. The physicochemical principles of modifying the composition and structure of manganese oxides (III, IV) as a method for the synthesis of ion exchangers selective for strontium ions have been established.
This work was supported by the Russian Foundation for Basic Research, project 19-43-590012.