Fedorova I. Technological mineralogy of concentration waste materials of Pivnichnyi Mining and Concentrating Complex of Krivyi Rih basin.

The thesis is devoted to investigations of mineralogical composition of tailings at Pivnichnyi Mining and Concentrating Complex that represent a technogenious iron ore deposit at dam part of Complex tailing pond. Its nature is close to placer deposits. The results of quantifiable mineralogical calculations and chemical analysis show that quality indexes of technogenious raw material are close to correspondant indexes of original iron ores of Pervomayske and Hannivske deposits that are worked out by Pivnichnyi Complex. Data on regularities of changes of granulometric composition and mineral content of tailing that lie along the dam of the tailing pond and in the direction from the dam to the central part of the tailing pond are shown. Topomineralogical studies allowed distinguishing technogenious iron ore deposit that has a shape of 300-500 strip located in the area from the dam into the tailing pond. After the results of mineralogical studies of tailings mineralogical ground of optimum technologies oftheir re-processing was developed. Data of mineralogical and technological experiments fulfilled on the basis of magnetic and gravity technologies are shown. It is indicated that mineralogical peculiarities of technogenious iron ore raw material stipulate the biggest efficiency of gravity or combined gravity and magnetic technologies, their use allows to obtain concentrate mass Fe content of 67-68 %. The results obtained allow to estimate the near dam deposit of tailings as high quality and prospective technogenious iron ore raw material.