Answer: Impurities in the form of iron oxides lower the
Chapter 11, Problem 11.55(choose chapter or problem)
Impurities in the form of iron oxides lower the economic value and usefulness of industrial minerals, such as kaolins, to ceramic and paper-processing industries. A 24 experiment was conducted to assess the effects of four factors on the percentage of iron removed from kaolin samples (Factorial Experiments in the Development of a Kaolin Bleaching Process Using Thiourea in Sulphuric Acid Solutions, Hydrometallurgy, 1997: 181197). The factors and their levels are listed in the following table: Low High Factor Description Units Level Level A H2SO4 M .10 .25 B Thiourea g/L 0.0 5.0 C Temperature C 70 90 D Time min. 30 150 The data from an unreplicated 24 experiment is listed in the next table. Iron Iron Test Extraction Test Extraction Run (%) Run (%) (1) 7 d 28 a 11 ad 51 b 7 bd 33 ab 12 abd 57 c 21 cd 70 ac 41 acd 95 bc 27 bcd 77 abc 48 abcd 99 a. Calculate estimates of all main effects and two-factor interaction effects for this experiment. b. Create a probability plot of the effects. Which effects appear to be important?
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