Double-layer effects in the flotation of fine particles

✍ Scribed by G.L. Collins; G.J. Jameson

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 890 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(77)80201-7

✦ Synopsis

Abstrae-Expenments have been conducted III wluch the charges on parkles and bubbles m a flotation process have been measured The partxles were polystyrene latlces of dmmeters between 4 and 20 v The bubbles were of mean dmmeter 53 m A catmmc sutfactant was used to promote ilotatmn, and the charge on the parkles and bubbles was controlled by add~tmn of sodmm sulpbate solutron To measure the charge on bubbles, they were generated electrolyacally III a glass electrophmesa cell so that they rose vertxally up a %a~ level" m the cell. whtle at the same bme movmg sideways under the a&on of a honzontal potenti grtient The honzontal velocity, taken with the known potentml went. gave the electromob&y The bubbles were found to carry the same sign as the partxles (posltwe) ami under the same electrolyte concentra~ons, the charge on the parhcles and bubbles was approxunately the same Experzmentally determmed rate constants for flotation were found to depend strongly on the bubble and parhcle charge, decreasmg by an order of magmtt& as the charge mcreased from 30 to 60 mV The data were well correlated by the equation -In&/d,'")=3 9+0 116 U,JJ, where k. IS the rate constant (mtr-'k d, 1s the uartxle dmmeter (JUII) and U,, l3, are the ekctmmobties (runls/Vicm) of the pmcle and'bubbk r&pectweiy