Processing of refractory materials using various magnesium sources derived from Zinelbulak talc-magnesite

Abstract

Magnesia (MgO) is widely used in the production of refractory materials due to its high melting point, high thermal shock, and excellent slag resistance. The properties of refractory materials depend upon magnesia sources and processing parameters. In this work, three different magnesium sources, namely, magnesium hydroxide concentrate, magnesium carbonate concentrate, and intermediate flotation concentrate, were obtained from the Zinelbulak talc-magnesite, Uzbekistan, by causticization-hydration and flotation processes, respectively. A series of refractory materials were prepared on the basis of these magnesium sources, and their effects on physico-mechanical properties and microstructures were investigated as a function of sintering temperature, molding pressure, and the particle size of magnesium sources. The experimental results showed that a refractory material obtained from the magnesium hydroxide concentrate at 1600°C for 4 h demonstrated favorable parameters due mainly to a higher degree of contact among fine particles. The results obtained from X-ray diffraction and optical microscopy confirmed the presence of periclase and forsterite as the predominant phases in refractory specimens. The prepared refractory materials meet the requirements of the State Standards (Nos.4689-94 and 14832-96) for magnesia and forsterite refractories, respectively. It is, therefore, suggested herein that the use of different magnesium sources derived from the Zinelbulak talc-magnesite will offer the potential to provide economic benefits in the refractory industry.

Research on the Floatability of Magnesite and its Gangue Minerals with Sodium Oleate and Lauryl Amine as Collectors

“…The demand for high purity magnesite oxide has been increasing considerably in recent years and the research on developing more efficient and effective process are being paid more and more attentions. Some researchers have studied the characteristics and the flotation technologies of magnesite and its gangue minerals separately [3,4,5,6,7,8]. This study has researched the floatability of magnesite, serpentine, dolomite, talc and quartz with sodium oleate and lauryl amine as collector, and the influence of the dosage of sodium oleate and lauryl amine, pH value, dosage of sodium silicate and sodium hexametaphosphate on the those five minerals, in order to provide reference for the beneficiation of magnesite.…”