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APSC 150 Case 3- Lab 4 Problems

# APSC 150 Case 3- Lab 4 Problems - 3 Process water after...

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APSC 150 - Case 3: Separation of Minerals by Froth Flotation. Laboratory 4 1) Lime (calcium hydroxide, Ca(OH) 2 ) is a common pH modifier in froth flotation. However, it has only limited solubility in water with the corresponding solubility product, K SO , equal to 5.5*10 -6 . Assuming that lime dissociates in water as Ca(OH) 2 = Ca 2+ + 2OH - , calculate the maximum pH value that can be attained by adding lime into distilled water. Note that the solubility product of lime is: K SO = [Ca 2+ ]*[OH - ] 2 = 5.5*10 -6 . 2) 5 cm 3 of a 5% (wt) collector solution (density 1.1 g/cm 3 ) is added to 5 dm 3 of an aqueous suspension of an ore with a solids content of 40% (wt) and density of 1.3 g/cm 3 . What is the dosage of the collector ? Express your result in grams of collector per tonne of dry ore (g/t).
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Unformatted text preview: 3) Process water after flotation is usually recovered and recycled back into the process. Assume that 5,000 m 3 of recycled water is available for flotation, and it turns out that this water still contains 5 mg/dm 3 of dissolved frother. The idea is to mix this recycled water with a fresh batch of dry ore to produce a flotation pulp with a solids content of 25% (wt). a) Is the amount of dissolved frother in recycled water sufficient to achieve a frother dosage of at least 12 g/t ? b) The frother is a pure alcohol with a density of 0.8 g/cm 3 . What volume of pure frother would be required to increase the dosage to 25 g/t from the value obtained under a) ?...
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