关键词: 离心萃取器, 流比, 转速, 萃取级数, 萃取率

Abstract:

Traditional gold extraction is an intermittent process，that has such problems as long operation time，large organic phase-loss and so on.As a new type of high efficient extraction equipment，the centrifugal extractor has the advantages of high efficiency，continuous operation and high operating elasticity，so it is widely used in liquid-liquid extraction.The application of centrifugal extractor in gold extraction was studied.The results show that the max rotation speed is 3 000 r/min under the premise that DBC is not emulsify.With rotation speed increasing，the extractability increases obviously first and then the increase rate slows down gradually，but the decrease of the phase ratio delays this tendency.With the decreasing of phase ratio，the extractability decreases gradually，the decrease rate becomes more significant，and this tendency is also enhanced by the increasing of rotation speed.With the increasing of extraction stages，the extractability increases rapidly，but the growing rate decreases，and finally reaches a steady state.Four stages of counter-current extraction was carried out in centrifugal extractor.Under the conditions of 2 000 r/min rotation speed，O/A=1∶3，the extractability could be arrived at 98%.

Key words: centrifugal extractor, phase ratio, rotation speed, extraction stages, extraction rate