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THE STUDY OF SERPENTINIZED ULTRAMAFICS FROM THE KARELIAN-KOLA REGION AND THE PRODUCTION OF A MG-RICH-SILICATE REAGENT ON THEIR BASIS FOR THE REMOVAL OF HEAVY METALS FROM SOLUTIONS
Abstract
The present study was conducted to develop a method for utilization of serpentinized ultramafic rocks as mining waste using nature conservation technologies. In this method, the original raw material is thermally activated to obtain an active metastable phase. The goal of the study is to produce a granulated Mg-silicate reagent used to remove heavy metal compounds from solutions. Pentinsuo antigorite, Ozerki soapstone deposit in the Kostomuksha area, Karelia, Russia, and serpophyte from the Pilguj?rvi massif, Pechenga Ore Field, Murmansk Region, Russia, were the targets of the study. The thermolysis of serpentinites, the effect of roasting temperatures on thermally activated products and solidification conditions (storing in the air, in a humid atmosphere and in water) on the strength of the adhesive were studied using electron microscopy, X-ray phase analysis, differential-thermal analysis and acid leaching. The maximum concentration of an active metastable phase in a thermally activated antigorite sample was found to be consistent with a temperature of 700-750 ? and is estimated at 12-14 mg-eq./g. This index for serpophyte is 8 mg-eq./g. The strength of the adhesive, based on a thermally activated antigorite sample, depends on solidification conditions and is 14-17 MPa. Therefore, a granulated Mg-silicate reagent for the production of bulk filters can be obtained. The results obtained show that Ozerki antigorite is promising for the production of a Mg-silicate reagent for the removal of heavy metals from solutions, e.g. highly polluted artificial solutions, by filtration by means of loading from a granulated reagent.
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