Mullite is an excellent ceramic material due to the unique properties, such as low coefficient of thermal expansion, high corrosion resistance to acid and alkali, high-temperature creep resistance, strong thermal shock resistance, high chemical and thermal stability, high permeability, and excellent mechanical properties. [1][2][3] Mullite ceramics have been widely utilized as metallurgical, glass, ceramic, and other industrial refractory materials. [4][5][6] They are also widely used as heatresistant materials, such as crucibles, protective tubes, and thermocouple tubes for electronic packaging. [7][8][9] Other applications include window materials under harsh chemical conditions and mechanical stress at high temperatures. [10][11][12] Mullite has been synthesized using various methods, such as sol-gel process, chemical syntheses, 13,14 co-precipitation, 6,15 hydrothermal reaction, 16,17 flash combustion, [18][19] and chemical vapor deposition. 20,21 However,
Firstly, the macroscopic chemical equilibrium state of a series of chemical reactions between intercrystal brine and its media salt layer (salt deposit) in Qarhan Salt Lake was studied by using the Pitzer theory. The concept of macroscopic solubility product and its relation with accumulated ore dissolving ratio were presented, which are used in the numerical model of dissolving and driving exploitation of potassium salt in Qarhan Salt Lake. And secondly, with a model forming idea of transport model for reacting solutes in the multi‐component fresh groundwater system in porous media being a reference, a two‐dimensional transport model coupled with a series of chemical reactions in a multi‐component brine porous system (salt deposits) was developed by using the Pitzer theory. Meanwhile, the model was applied to model potassium/magnesium transport in Qarhan Salt Lake in order to study the transfer law of solid and liquid phases in the dissolving and driving process and to design the optimal injection/abstraction strategy for dissolving and capturing maximum Potassium/Magnesium in the mining of salt deposits in Qarhan Salt Lake.
Special silicon mullite brick for transition belt of cement kiln was prepared using bauxite clinke, white fused alumina, silicon carbide, guangxi white clay, alumina micro-powder additions as main starting materials and sulfite pulp waste liquid as binder. Effects of alumina micropowder additions on cold physical properties, thermal shock resistance and abrasion resistance of silicon mullite brick were studied. The samples were characterized by XRD and SEM. The results showed that with alumina micro-powder addition increasing, cold strength, bulk density of special silicon mullite brick were first enhanced and then declined; apparent porosity first decreased and then increased; thermal shock resistance of the brick was first enhanced and then declined. When the addition of alumina micro-powder was 4 %, the silicon mullite brick had the best properties and the brick as ideal lining materials of the transition belt of large-scale cement rotary kiln.
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