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By K.K. Chatterjee

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The particles are partially fused and they join together to yield a strong product known as sintered bauxite. (iii) Calcined alumina: This alumina is not produced directly from bauxite as in the cases of the above, but is the product of drying of Al(OH)3 produced by Bayer’s process. , 9 on Mohs scale. , injection gates and sliding gates in iron and steel plants). However, in this case, additional care has to be taken for removal of sodium, if any, from the Al(OH)3 by adding boric acid after digestion, because the sodium in the form of Na2O is carried into the alumina, and when this alumina is calcined, it forms a low melting glass.

27) Titanium aluminium tin alloy Ti 91-94%; Al 4-6%; Sn 2-3% Used in aircraft tailpipe assemblies, sheet components subjected to up to 500°C temperature, gas turbine compressor rings, missile fuel tanks. 5% High strength alloy, used for highly stressed structural components in aircraft and structural engineering. (29) Titanium-aluminiummolybdenum alpha-beta alloy Ti 89%; Al 7%; Mo 4%. Poor weldability, but high strength at high temperature; shallow hardening. (30) Titanium-vanadiumchromium-aluminium beta alloy Ti 73%; V 13%; Cr 11%; Al 3% Better weldability than the alpha-beta alloy; high density; thermally stable above 370°C; amenability to cold working.

The Bureau of Indian Standards (BIS), in 1985, has set a standard of specifications for different parameters. 2% (max);LOI: 20% (min). 50% reactive silica;20-30% Fe2O3+TiO2. 2. Low temperature calcination for making activated bauxite: In this case, the objective is to achieve maximum pore space. If the bauxite consists of monohydrate boehmite, then the mass shrinks and becomes compact when the only water molecule is removed, because there will be no more water to absorb the heat. Therefore, only trihydrate gibbsitic bauxite is suitable.

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