1-(20 points) A process tank has a volume of 1000 liters. If the feed to the tan

Question

1-(20 points) A process tank has a volume of 1000 liters. If the feed to the tank is pumped at a rate of 50 gallons per minute, what is the residence time of the process?

2-(30 points) A slurry sample weighs 15.0 kg. When the dry solids are recovered, they are found to weigh 2.5 lbs.

              (a) What is the wt% solids of the slurry?      

              (b) What is the weight of water in the sample?                                                                          

              (c)What is the volume (both liters and gallons) of water in the slurry?

3- (50 points) You have been asked to prepare a suspension of magnetite (specific gravity 5.2) in water. The specific gravity of the suspension needs to be 1.6 and you will need 500 liters of the suspension. How much magnetite to you need to add?

Explanation / Answer

Ans 1

Volume of tank = 1000 L x 1 gallon/3.785L

= 264.2 gallon

Feed to the tank = 50 gallons/min

Residence time = volume of tank / feed to tank

= 264.2 gallon / (50 gallons/min)

= 5.284 min

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