MELTING OF RESOURCE-SAVING ALLOYS FOR PRECISION Ni-Mo ALLOYS: OPTIMIZATION OF TECHNICAL AND ECONOMIC INDICATORS.

The phase and X-ray structure composition of the initial and target products of Ni-Mo ligature and its melting conditions are determined. The optimal values of the content of charge materials during the smelting of a nickelmolybdenum-containing ligature were determine: scale of the alloy 79NM 4.2 - 28 % wt., shavings of power grinding of metal products 79NM 3.8 - 56.1 % wt., calcite molybdenum concentrate KMo 20.5 - 12.5 % wt., technical nickel oxide 13.0 - 22.0 % wt., cyclone silicon dust 3.4 - 7.9 % wt., metallic manganese MR-1 1.0 - 4.7 % wt., soot TGM-33 1.5 - 4.0 % wt., aluminium AK-8 0.8 - 6.0 % wt. Regularities of influence of charge parameters on the content of leading elements of ligature and efficiency of smelting of precision alloys with use of ligature are established. According to the specified method, calculations of economic efficiency of Ni and Mo utilization from man-made wastes of different sources of formation are performed. In order to achieve the optimal properties of the target ligature, taking into account the complex effect of the composition of the ingredients of the charge on reducing the cost of redistribution of the ligature smelting used regression analysis. The developed mathematical model of Ni and Mo burn-up dependences using the ligature on the content of 8 components in the charge for its smelting was tested by the generalized method of least squares on the basis of industrial data. High technical and economic efficiency of use of new alloying and de-oxidizing material at smelting of precision alloys is established. [ABSTRACT FROM AUTHOR]