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Gorundum-mullite materials were prepared with homogeneous bauxite chamotte, andalusite fine powder, Guangxi white clay as raw materials firing at 1 400 °C for 4 h. The effect of the andalusite fine powder addition (0,5%,10%,and 15%,by mass) on their properties such as the density, the strength, the refractoriness under load, the thermal shock resistance, the hot creep resistance was studied. The results show that: (1) with the increase of the andalusite fine powder addition, the bulk density of the samples gradually decreases, the thermal shock resistance and the hot creep resistance gradually enhance, the refractoriness under load gradually rises, and the cold crushing strength basically remains unchanged; the sample added with 15% of andalusite has the best comprehensive performance; (2)after firing at 1 400 °C for 4 h,the surface layer of andalusite fine powder particles shows complete mullitization,and the mullitization degree gradually decreases from the surface to the inside, which enables further mullitization during subsequent high-temperature heating, thus playing a positive role to the thermal shock resistance, the hot creep resistance and the refractoriness under load of the materials. [ABSTRACT FROM AUTHOR]

The study of flotation interaction between andalusite and quartz found that when the pH value is 8 and the dosage of FeCl$ * 6H2O is 20 mg/L and the dosage of sodium oleate is 150 mg/L? with the interaction distance between the andalusite and quartz particles is smaller，the negative value of the total E DLVO potential energy is larger ?indicating that the force of each grade of quartz and different grades of andalusite is attractive，and there is an adhesive cover between each other. Microscopic observations further verified that adhesion between andalusite and quartz did occur. The main effect form of the interactive effect of andalusite and quartz flotation is the mutual adhesion cover between minerals ? including fine grained quartz，it can adhere to coarse grained andalusite? which is represented by the slime cover?fine grained andalusite can adhere to coarse grained quartz，fine grained andalusite can adhere to and aggregate with fine grained quartz. In the sodium oleate system ? citric acid can be used to effectively weaken the adhesion and cover between quartz and andalusite. The better effect of citric acid on the separation of andalusite and quartz is concentrated at -- 106 + 45 ptm and -- 45 + 18 ptm. [ABSTRACT FROM AUTHOR]