Electrolytic manganese dioxide can be prepared from manganese carbonate ore by crushing, milling and leaching the ore in sulphuric acid. Manganese sulphate is crystallised from the solution, redissolved and electrolysed to give the manganese dioxide. (a) After crushing, the ore is milled from a maximum size of 5.0 mm to 1.0 mm using an energy input of 70kW/tonne. Using Bond’s relationship, calculate the work index. If the milling equipment were allowed to mill to 0.075 mm what will be the energy input? (b) If the crystallisation were performed in a 30m3 tank and the concentration of the solution entering the tank were 160 grams per litre and left the tank at 40 grams per litre, how much MnSO4.5H2O would be produced
Electrolytic manganese dioxide can be prepared from manganese carbonate ore by crushing,
milling and leaching the ore in sulphuric acid. Manganese sulphate is crystallised from the
solution, redissolved and electrolysed to give the manganese dioxide.
(a) After crushing, the ore is milled from a maximum size of 5.0 mm to 1.0 mm using an energy
input of 70kW/tonne. Using Bond’s relationship, calculate the work index. If the milling
equipment were allowed to mill to 0.075 mm what will be the energy input?
(b) If the crystallisation were performed in a 30m3 tank and the concentration of the solution
entering the tank were 160 grams per litre and left the tank at 40 grams per litre, how much
MnSO4.5H2O would be produced
please answer the b only
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