Impregnation of a periclase-chromite lining with nickel matte

Results of an investigation of periclase-chromite linings in contact with matte (sulfide-metallic melt) in shaft melting of oxidized nickel ores are presented. It is shown that the sulfide components of matte, preferentially iron sulfide, impregnate the refractory, whereas the metal (21.9–23.1% Ni, 1.38–1.45% Co, 73.3–76.1% Fe, and 0.8–1.0% S) remains in the gaps between bricks. Chemical analysis data show that the sulfide-impregnated refractory contains 5.1–9.5% S, 9.8–27.9% Fe, 1.8–7.5% Ni, 0.09–0.15% Co, which markedly decreases the heat engineering parameters of the refractory and the entire lining. The results clarify the mechanism of failure of refractories and the formation of skull.Translated from Ogneupory, No. 6, pp. 28–29, June, 1995.     

Thermal expansion and phase transformations of copper sulfides

The microstructure and phase transformations of copper sulfides have been studied by thermal analysis, microstructural analysis, and x-ray diffraction during heating in an inert atmosphere. The unit-cell parameters of Cu_1.8S, CuS, Cu_1.96S, and a Cu_1.8+x S (0 < x ≤ 0.2) solid solution have been determined as functions of temperature.     

Optimization of Process Conditions and Implementation of Continuous Methyl Methacrylate Polymerization Process in Suspension

Chemical and Petroleum Engineering - A method of continuous methyl methacrylate polymerization in suspension using a cascade of full mixing reactors and full displacement columnar apparatuses is...