INVESTIGATING THE PROCESS OF OBTAINING FERROMOLYBDEN¬U-M FROM PRELIMINARY MECHANOACTIVATED TEGHUT MOLYBDENITE CONCENTRATE

Abstract

The dependence of the total metal yield on the quantitative ratio of the alloy components, in particular on the amount of iron (or Fe₂O₃), aluminum powder, CaO, NaNO₃ and CaF₂, is studied. According to calculations of the initial material balance of the mixture, the composition of the ferromolybdenum alloy required to obtain an alloy of ferromolybdenum with 36,84% Fe and 63,16% Mo is as follows: pre-mechanized molyb­de­n­u­m concentrate - 47,05%, iron fragments - 10, Al powder - 18 , 99%, NaN0₃ – 4,71%, lime – 15,82% and CaF₂ - 2.88%.

The optimal parameters of the aluminum-thermal reduction process of the combus­ti­o­n mixture are selected experimentally, according to which the amount of Fe₂O₃ in the mixture should be 15g, the amount of the reducing agent - more than 25%, and the amount of CaO - 8g, NaNO₃ - 10g and CaF₂ - 5g, calculated by mass of 100g of mixture. As a result, monoferromolybdenum with a 95,6% microhomogeneous structure was obtain­e­d, the chemical composition of which is 36,44% Fe, 63,16% Mo and 0,4% Al. It has been shown that by increasing the dispersion of the reactants, the difficult, labor-intensive process of annealing the molybdenum concentrate can be bypassed by direct metallo-thermal recovery of the concentrate. It has been found that increasing the dispersion also increases the intensity of the reactions in the recovery process.