The purpose of the work is to develop methods for the treatment of oxidized quartzite, using methods of electochemical effects on hematite grains, converting it into magnetite for further magnetic separation. In laboratory conditions, the basic parameters of the process of recovery of hematite component of oxidized quartzite in aqueous suspension to magnetite with its magnetic properties have been established. When conducting the process of recovery of hematite to magnetite, the possibility of replacement of high-alkaline electrolytes with neutral salts formed by solutions has been established.The influence of structural features of experimental reactors on the recovery of hematite to magnetite has been developed and analyzed; the ability of membrane materials to effectively separate the anolytic and catholic spaces; the influence of electrode materials - anode and cathode, on the magnetization process; electrical parameters of electrical influence on the course of the process; composition of the electrolyte in the process of magnetization. The fiberglass membrane was shown to have a better ability to separate the anolytic and katholyte; maximum degrees of magnetization obtained when using electrodes from low carbon steels; optimal values of the degree of recovery of hematite in laboratory conditions were obtained at 15-25 V and 2.0-4.0 A. The thermodynamic possibility and realization of the processes of reduction of oxidized ores in aqueous solutions of electrolytes at low temperatures with obtaining the magnetic phase are shown. For electrolysis, high alkaline electrolytes can be replaced by electrolytes based on chloride and sulfate salts. The best results are obtained using NH4Cl ammonium chloride.
Deformation band formation and strength evolution in unlithified sand: The role of grain breakage