Sokolov K. Improving of the technology competitive ferronickel in conditions of "Pobuzhsky ferronickel plant" (PFP) using of foreing deposits raw materials

Thesis is devoted to improving the technology of ferronickel at all stages of its production on PFP in condition of changing to a higher quality imported ore by plant. In this thesis it was performed analyzes of the state of production and consumption of nickel and it is shown that the total output volume of primary nickel products the ferronickel share is about 25-30%. It was studied the mineralogical composition and the phase-structural transformation of raw materials in the process of electrical melting of rough ferronickel, as well as the properties of furnace slag. It allowed to optimize the sintering conditions of the original ore and the temperature conditions of the slag phase in the process of smelting the rough ferronickel. It was made a complex of thermodynamic studies on refining outside the furnace of rough ferronickel, according to which it is recommended an innovative scheme of refining, which allowed to improve the efficiency of desulfurization and reduce the consumption of soda. It was developed a thermodynamic model of the interaction of refractory materials with products of melting. It was made a comparative calculations of thermophysical properties of variant configurations of the hearth lining. It was developed measures and main directions of utilization of secondary material in its own production, as well as in related industries. The proposed scheme preparations of nickel-containing dust, purification of moved off gases Tubular Rotary Furnace by means of roll briquetting to reduced the dust content of purified gases more than two times (from 0.581 to 0.101 g/nm3). Enhanced cross-cutting technological scheme of production of ferronickel using a magnesium oxide nickel ores of New Caledonia and Indonesia deposits allowed to reduced specific energy consumption per 1 ton of pure nickel in more than 2 times and increase daily productivity by 3 times.