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investigated. After adjusting current applied to the Davis Tube electromagnets to a desired value, a motor frequency and water flow rate were adjusted at 90 strokes per minute and 0.5 L/minute, respectively. Ten grams of -210 μm materials were then introduced to the Davis tube. After a 10 minute operation, the motor was shut off. The non-magnetic material was discharged and rinsed by water. The magnetic material was subsequently washed in a beaker after turning off the current applied to the electromagnet. Each product was filtered, dried, weighed and prepared for ICP-MS analysis. 5.1.5 Microflotation A Partridge-Smith cell shown in Fig. 5.3 was used for small-scale flotation trials. In each test, after a Davis Tube test, approximately 0.5 grams of -210 μm non-magnetic materials was conditioned in a 40 mL desirable solution for 10 minutes at specific pH value in a 100 mL beaker. Then, one drop of frother was added to the beaker and the solution was conditioned for another 10 minutes. After conditioning, the sample was transferred to the cell, and rinsed by the 12 mL solution which had the same reagent concentration and pH till any residual sample in the beaker was entirely transferred to the cell. The solution was agitated by a stirring bar within the cell at 600 rpm. Compressed air was introduced into the cell at a flow rate of 39.7 cm3/minute. After floating for 2 minutes, both concentrate and tailing products were filtered, washed, dried and weighed. The chemical analysis was performed by an acid digestion and ICP-MS. 5.2 Results and Discussion In order to achieve an efficient concentration of the valuable metals from the waste printed circuit boards, each physical separation trial was conducted for various particle size ranges. This section presents the results from the physical separation, and a discussion on the possibility of the selected physical separation methods for pre-concentrating valuable metals from waste printed circuit boards. 5.2.1 Calculation of Gravity Concentration Criterion Often before leaching is considered, gravity separation is investigated as a method of pre- concentration. Gravity concentration is defined as a process where particles are separated by their movement in response to the force of gravity or centrifugal force. There are four mechanisms that 50PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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