When the Bayer s process is used for recovering aluminium from siliceous ores some aluminium is always lost because of the

Question

When the Bayer s process is used for recovering aluminium from siliceous ores some aluminium is always lost because of the formation of an unworkable mud having the following average formula 3Na O 3Al O 5SIO SH O Since alu minium and sodium ions are always in excess in the solution from which this precipitate is formed the precipitation of the silicon in the mud is complete A certain ore contains 13 by weight Kaolin ALO 2SiO 2H 0 and 87 gibbsite ALO 3H O Al 27 SI 28 10 What per cent of the total aluminium in this ore is 12 How many moles of AI O are present per mole of recoverable in the Bayer s process ore a 80 c 85 b 90 d 75 11 What is the percentage of silica present in the ore by weight a 2 82 c 46 5 b 3 02 d 6 05 a 1 000 c 0 222 b 0 083 d 0 242

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