The document discusses key product specifications for sinter including composition ranges for coke consumption, iron content, iron oxide, aluminum oxide, and magnesium oxide. It also lists the acceptable lower and upper specification limits to define defects, and opportunities to improve the sintering process such as proper raw material composition and machine operation to increase strength, size control, and productivity.

1. CTQs, Specs & Defects
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Gain from the Power of Lean Six Sigma – MOOC
By Nilakantasrinivasan
Assignment Submission of : Sushma Ekka

2. Product or Service Selected : Sinter
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3. All Rights Reserved. Copyright @ 2014 Canopus Business Management Group 3
CTQs Specification Limits (SL) Defect Opportunities
Lower SL Upper SL
Composition Coke
consumption ,
kg/t of sinter
Total Fe 5
% FeO
Al2O3
% MgO
39
51
4
0.6
0.7
54
61
11
2.2
1.8
At the basemix preparation
stage where raw materials
for sinter are proportioned
Size Sinter Size 5 mm - 50 mm At crushing stage
Strength Tumbler Index 63 79 Can be assured by good
raw material composition
and good sintering process
Productivity t/hr/m 1.3 Is dependent on machine
working hours