5-2. Estimate the critical speed and horsepower requirements for a trommel screen, 3 m in diameter, processing refuse so as to run 25% full.
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5-2. Critical speed only (you do not have to estimate horsepower)
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- Two materials, A and B, are to be separated using two unit operations, 1 and 2. The feed has 10 tons/h A and 4 tons/h B. The split (fraction of material rejected by each operation) is given in Table P5-14. a. Which sequence of operations, (l?2) or (2?1), will yield the greatest recovery of material A? b. What will be the purity of material A using that sequence? c. What will be the efficiency of separation for the entire process train with regard to material A using the Worrell-Stesed equation?2. Dozer Production Calculation How long will it take for a track-type dozer w/straight blade to move 1,000 bcy's of dry earth 100 feet? Assume average blade load of 5 lcy Forward travel @ 2.5 mph Reverse travel @ 3 mph Assume maneuver time about 0.05 min Work 45-min/hour3m X34x3MX Jm NA SORN 2kN Dnd the internal ores la m embern en, DH and Haa
- 5-1. Suppose that a proposal is made to hand-sort all of the refuse from a town of 100,000 people. Estimate the personnel and cost required, and describe the problems involved in implementing such a program. 5-2. Estimate the critical speed and horsepower requirements for a trommel screen, 3 m in diameter, processing refuse so as to run 25% full. 5-3. If the angle of a trommel screen were increased (steeper), how would this affect the critical speed, horsepower, and efficiency? 5-4. Aluminum chips of uniform diameter 1.0 in. are to be separated from glass of 100% less than 0.5 in. by use of a single-deck reciprocating screen. The total feed rate is 1 ton/h, consisting of 0.1 ton/h of aluminum and 0.9 ton/h of glass. It is required to produce an aluminum fraction that is 99% pure (by weight). Find the area and size of screen required. 5-5. Using the aluminum/glass mixture specified in Problem 5-4, assume that the smallest glass particle of signifi- cance is 0.05 in. in diameter.…Waste contents are equally distributed everywhere in () PFR CSTRThe expected production of a pneumatic roller is 665 CCCY/h. The lift thickness is 8 inches, with a roller width of 10 feet. If the job efficiency is 85%, calculate the speed and number of passes required to maintain this production, provided that when the speed increases by 20%, two additional passes need to be added to maintain the same production.
- Before it is permissible for the dozer to "track" over an exposed pipe in order to get to the other side of the trench. O a. compacting O b.testing Oc backfillinE O d.commissioningcalculati the B005 at 20°C of a waste water data- BOD bottle capacity following SEED CONTROL sample вол = 300 me TEST SAMPLE vol. of Seed added = Doi of Seed + DW = DO of seed + DW = 4.8 ome 8.2mg le mgle vol- of seed added = 2ml vol of sample added = 30 me Doi of SS + D.W + Sample = DOf of S.St D.W + sample = 6.1mg = 3.2 Il mgle. (25 points) A batch plant mixes 80 tons of asphalt mix with an average mixing cycle time of 1 min. Plant efficiency is 90%. Estimate plant production in ton/hr. Assuming that you have a sufficient number of trucks to haul the asphalt to the job site, can this plant keep up with a paver moving at 2mph and laying down a 20’ lane of a highway job that is to be compacted to 6” thickness with a density of 150 lb/cf?
- Calculate the number of bags required for a shaker baghouse for removal of gypsum with the following process information and bag dimensions. Q, process gas exhaust rate 15,000 ft3/min Bag dimensions: bag diameter 6 in. bag height 12 ft How many bags are required?Mr. Jae Yeong wants to put up a plant rack for his mini garden using a recyclable material from neighboring construction site. The materials given allowed him to do so but with some repair (welding 2 aluminum blocks). Given that there should be an allowable specification requirement for the rack to serve its purpose. Determine the value of the largest P that can be applied. a 1.5 in 4.5 in a t 0.65 in Oallow 30 ksi Tallow 19 ksiQ) An engine lathe is used to turn a cylindrical work part 150 mm in diameter by 500 mm long. Cutting speed 2.50 m/s, feed 0.30 mm/rev, and depth of cut 3.0 mm. Determine (a) cutting time and (b) metal removal rate.