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Thapar Institute of Engineering and Technology, Patiala-147004

The document is a tutorial for UCH401: Fluid and Particle Mechanics at Thapar Institute, focusing on screening and screen analysis. It includes four questions involving calculations related to mass ratios, screen efficiency, and specific gravity of materials in a screening process. Additionally, it requests short notes on various types of screens used in engineering.

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Jatin Kanojia
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49 views1 page

Thapar Institute of Engineering and Technology, Patiala-147004

The document is a tutorial for UCH401: Fluid and Particle Mechanics at Thapar Institute, focusing on screening and screen analysis. It includes four questions involving calculations related to mass ratios, screen efficiency, and specific gravity of materials in a screening process. Additionally, it requests short notes on various types of screens used in engineering.

Uploaded by

Jatin Kanojia
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Thapar Institute of Engineering and Technology, Patiala-147004

Department of Chemical Engineering


UCH401: Fluid and Particle Mechanics
Instructor: Dr. Avinash Chandra
Tutorial-3 (Screening/Screen Analysis)

Q1. A quartz mixture is screened through a 10-mesh screen. Calculate the mass ratios of overflow to feed and
underflow to feed. Also calculate the overall effectiveness of screen. The cumulative screen analysis of the feed,
overflow and underflow are given in the following table.

Q2. A sponge iron industry uses a reciprocating screen of 5-mm aperture to separate oversize fines which is then
recycled to the furnace. The screen efficiency was known to be 50%. The underflow from the screen contains
around 95% fines. If the furnace production rate is 100 tonne/h, find the product rate and the amount of fines
present in it.

Q3. A set of coarse size screen was constructed from steel rods and used to evaluate the screen efficiency of a
60cm×40cm black jaw crusher. The standard Tyler relationship was maintained between the screen apertures
in the above set of large screens. Calcite was feed to the crusher at the rate of 45 tonne/h driven by a 30-hp
motor. The screen analysis of feed and product is given below. The value of specific ratio may be taken same
for both calcine and quartz. Calculate
a) The efficiency of the crusher assuming the motor to be operated at an average of (1/6)th of the normal
rating and
b) The tonne/h of quartz that can be fed to the crusher and reduced on the same size range with the same
power.
Data:
Specific gravity of calcite = 2.71
Specific gravity of quartz = 2.65
Rittinger’s number of calcite = 76.05 cm2/kg.cm
Rittinger’s number of quartz = 17.51 cm2/kg.cm
Screen analysis of feed and product are as follows:

Q4. Write short notes on the followings:


i. Tyler screen series
ii. Grizzly screens/ Grizzlies
iii. Trommel Screens
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