Papers by Keyword: Fused Magnesia

Abstract: Al-Al₂O₃-MgO specimen was made with fused magnesia as aggregate, tabular alumina, fused magnesia and aluminum as co-matrix. It is sintered at 1600 °C under N₂. Aluminum powder contents is 0%, 4%, 6%, 10% respectively. The result shows: the sample has formed new phase of AlN, AlON, MgAlON. When aluminum powder contents is 4% AlN and AlON begin to form, and aluminum powder is 6% AlN and AlON form obviously, and MgAlON is formed. Besides the amount of MgAlON is increasing with the aluminum content adding. Aluminum-adding is good solution to decrease the synthesis temperature of AlON, MgAlON.

Abstract: Fused magnesia is an essential basic material for metal making and construction industries. Fused magnesia is usually produced with mineral arc furnace. In China, 1600 kVA arc furnaces are widely used as fused magnesia production facility. The unit power consumption for magnesia production is about 3000 kWh/t, higher than that in developed countries. In this research, a 3000 kVA new arc furnace was used to produce fused magnesia, and the unit consumption decreased to 2560kWh/t. The experimental results showed that the new furnace has good energy saving effect and market prospects.

Abstract: The present study is related to a process development for producing high purity fused magnesia. A newly designed 3000 kVA electric arc furnace is used in the field experiment. The electric resistance characteristic of fused magnesia is analyzed and the effect of electrode diameters and electrode depth buried in molten magnesia on melting electric resistance and electric arc heat conversion are discussed in detail. It shows that, for the new 3000 kVA electric arc furnace, 350~450 mm diameter electrode and ~300mm depth in molten magnesia are suitable.

Abstract: This work mainly studied the corrosion and dissolution performance of fused magnesia in alkaline solution . The influences of temperature, time and the concentration of alkaline solution on the weight change and particle morphology of magnesia powder were investigated. The corrosion mechanism and dynamics of the magnesia in alkaline solution were discussed by measuring the weight change and XRD analysis. Above results of dissolution studied of fused magnesia powders in alkaline solution would offer important corrosion information for ceramic bulks.