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5.3 The following data have been obtained from a laboratory settling test on a slurry of mineral solids (S.G.= 4.0) in water. The test slurry concentration was 200 g solids/L water. Time (min) Height (mm) 10 20 30 40 50 60 80 100 120 160 200 498 395 291 204 178 169 160 154 151 148 142 140 a. Construct a curve showing the relationship between solids flux and solids concentration. b. A continuous thickener is required to process 300 tonnes/h of the mineral slurry containing 250 g solids/L water. The underflow velocity is to be fixed at 0.12 m/h. Determine the minimum cross sectional area required for the thickener, and the maximum concentration of the underflow in (g solids/L water). c. If the operating underflow concentration is 550 g solids/L water, what is the actual diameter of the thickener? Would this diameter be acceptable? d. Estimate the thickener depth required for the thickener in case (c). Approx. ans. (b) 810 m2; 728 g solids/L (c) 36.5 m; yes (d) 1.0 – 2.2 m

5.3 The following data have been obtained from a laboratory settling test on a slurry of mineral solids (S.G.= 4.0) in water. The test slurry concentration was 200 g solids/L water. Time (min) Height (mm) 10 20 30 40 50 60 80 100 120 160 200 498 395 291 204 178 169 160 154 151 148 142 140 a. Construct a curve showing the relationship between solids flux and solids concentration. b. A continuous thickener is required to process 300 tonnes/h of the mineral slurry containing 250 g solids/L water. The underflow velocity is to be fixed at 0.12 m/h. Determine the minimum cross sectional area required for the thickener, and the maximum concentration of the underflow in (g solids/L water). c. If the operating underflow concentration is 550 g solids/L water, what is the actual diameter of the thickener? Would this diameter be acceptable? d. Estimate the thickener depth required for the thickener in case (c). Approx. ans. (b) 810 m2; 728 g solids/L (c) 36.5 m; yes (d) 1.0 – 2.2 m

Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter7: Permeability
Section: Chapter Questions
Problem 7.17P
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5.3 The following data have been obtained from a laboratory settling test on a slurry of mineral solids (S.G.= 4.0) in water. The test slurry concentration was 200 g solids/L water. Time (min) Height (mm) 10 20 30 40 50 60 80 100 120 160 200 498 395 291 204 178 169 160 154 151 148 142 140 a. Construct a curve showing the relationship between solids flux and solids concentration. b. A continuous thickener is required to process 300 tonnes/h of the mineral slurry containing 250 g solids/L water. The underflow velocity is to be fixed at 0.12 m/h. Determine the minimum cross sectional area required for the thickener, and the maximum concentration of the underflow in (g solids/L water). c. If the operating underflow concentration is 550 g solids/L water, what is the actual diameter of the thickener? Would this diameter be acceptable? d. Estimate the thickener depth required for the thickener in case (c). Approx. ans. (b) 810 m2; 728 g solids/L (c) 36.5 m; yes (d) 1.0 – 2.2 m
Transcribed Image Text:5.3 The following data have been obtained from a laboratory settling test on a slurry of mineral solids (S.G.= 4.0) in water. The test slurry concentration was 200 g solids/L water. Time (min) Height (mm) 10 20 30 40 50 60 80 100 120 160 200 498 395 291 204 178 169 160 154 151 148 142 140 a. Construct a curve showing the relationship between solids flux and solids concentration. b. A continuous thickener is required to process 300 tonnes/h of the mineral slurry containing 250 g solids/L water. The underflow velocity is to be fixed at 0.12 m/h. Determine the minimum cross sectional area required for the thickener, and the maximum concentration of the underflow in (g solids/L water). c. If the operating underflow concentration is 550 g solids/L water, what is the actual diameter of the thickener? Would this diameter be acceptable? d. Estimate the thickener depth required for the thickener in case (c). Approx. ans. (b) 810 m2; 728 g solids/L (c) 36.5 m; yes (d) 1.0 – 2.2 m
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