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Question

Reactants of superphosphate are mixed in a ____________ chamber with a mechanical stirrer and two valves at the bottom.

A
cast iron
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B
stainless steel
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C
mild stainless steel
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D
copper
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Solution

The correct option is A cast iron

A well powdered phosphate rock or bone ash mixed known quantity of concentrate sulphuric acid is introduced into a cast iron chamber provided with mechanical stirrer and two valves at bottom. Each valve opens in a big chamber called den. The mixture is stirred for 2 to 5 minutes and then dumped mechanically into one of the dens through the valve. The mass is kept in the den for about 24 hours.


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