Example 5.1 Basic selection and data analysis procedures

1 Example 5.1 Basic selection and data analysis procedures 

The continuous recovery of dewatered (unwashed) solids from a slurry is required, the throughput of the latter is 10 m h Basic properties, sedimentation and filtration test results are available for a sample of the slurry. Draw up a preliminary list of equipment which may be suitable for this separation. 

The density of the solid and the liquid are 2650 and 998 kg m respectively while the liquid phase viscosity is 0.001 Pa s. The solids concentration in the slurry has been determined as 23% w/w. 

The time vs. suspension-supernatant interface height data shown in Table 5.3 were obtained from ajar sedimentation test using a one litre measuring cylinder with an inside diameter of 6.5 cm. The supernatant clarity was good. The time vs. cumulative filtrate volume data shown in Table 5.4 were obtained from a leaf filter (Buchner) test using a vacuum of 70 kPa. The filter leaf had an area of 38 cm, and the final masses of wet and dry cake were 197 g and 128 g respectively. The final cake height was estimated to be 3.1 cm. Both tests were performed in accordance with the recommendations shown in Chapter 4. 

Settling time (s) Suspension volume (cm ) Interface height (cmY 

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