CuSO4·5H2O containing 3.5 percent of a soluble impurity is dissolved continuously in sufficient water and recycled mother liquor to make a saturated solution at 80 °C. The solution is then cooled to 25 °C, and crystals of CuSO4·5H2O are thereby obtained. These crystals carry 10 percent of their dry weight as adhering mother liquor. The crystals are then dried to zero free water (CuSO4·5H2O). The allowable impurity in the product is 0.6 weight percent. a. Calculate the weight of the water and of recycled mother liquor required per 100 kg of impure copper sulfate. b. Calculate the percentage recovery of copper sulfate, assuming that the mother liquor not recycled is discarded. The solubility of CuSO4·5H2O at 80 °C is 120 g per 100 g of free water and at 25 °C is 40 g per 100 g of free water.
CuSO4·5H2O containing 3.5 percent of a soluble impurity is dissolved continuously in sufficient water and recycled mother liquor to make a saturated solution at 80 °C. The solution is then cooled to 25 °C, and crystals of CuSO4·5H2O are thereby obtained. These crystals carry 10 percent of their dry weight as adhering mother liquor. The crystals are then dried to zero free water (CuSO4·5H2O). The allowable impurity in the product is 0.6 weight percent. a. Calculate the weight of the water and of recycled mother liquor required per 100 kg of impure copper sulfate. b. Calculate the percentage recovery of copper sulfate, assuming that the mother liquor not recycled is discarded. The solubility of CuSO4·5H2O at 80 °C is 120 g per 100 g of free water and at 25 °C is 40 g per 100 g of free water.
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CuSO4·5H2O containing 3.5 percent of a soluble impurity is dissolved continuously in
sufficient water and recycled mother liquor to make a saturated solution at 80 °C. The
solution is then cooled to 25 °C, and crystals of CuSO4·5H2O are thereby obtained. These
crystals carry 10 percent of their dry weight as adhering mother liquor. The crystals are
then dried to zero free water (CuSO4·5H2O). The allowable impurity in the product is 0.6
weight percent.
a. Calculate the weight of the water and of recycled mother liquor required per 100
kg of impure copper sulfate.
b. Calculate the percentage recovery of copper sulfate, assuming that the mother
liquor not recycled is discarded.
The solubility of CuSO4·5H2O at 80 °C is 120 g per 100 g of free water and at 25 °C is 40
g per 100 g of free water.
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Step 1: Define the problem
VIEWStep 2: Determine the amount of feed and discarded mother liquor
VIEWStep 3: Determine the amount of recycle and amount of solution at 80 0C
VIEWStep 4: Determine the amount of make up water and recycle stream
VIEWStep 5: Determine the % recovery of copper sulfate
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