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Figure 6.1 Schematic diagram of leaching set-up 6.2 Four-acid Digestion (HCl-HNO3-HF-H3BO3) 1. Weigh the residue from the leaching test and pour it into a 250 mL polypropylene bottle (#1) with a magnetic stirrer 2. Add 30 mL 38% hydrochloric acid, 10 mL 70% nitric acid and 5 mL 48% hydrofluoric acid 3. Place the polypropylene bottle in a 400 mL beaker filled with about 100 mL of water; take the beaker and place it on a hot plate with magnetic stirring and set the temperature 150 °C for 1.5 hours 4. Remove the bottle from the beaker and add 40 mL of 30 g/L H3BO3 solution to the bottle 5. Place the bottle back in the beaker and let it react for another 30 minutes 6. Weigh and label a filter paper, Whatman No. 42, and record weight 7. Weigh a 250 mL polypropylene bottle (#2) and label 8. Filter the cooled solution into the 250 mL polypropylene bottle (#2) and rinse the magnetic stirrer and bottle (#1) with deionized water 66PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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