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Enha.cing recovery of ura.ium column biolea.hing by process optimiza.ion a.d kinetic modeling

Tra.sa.tions of Nonferrous Meta.s Society of China 2017年第12期27卷 2691-2703页

作者： H. Za.E Ta.a.OLI M. a.DOLLa.Y S. J. a.Ma.I a. khodadadi darban Mining Engineering Depa.tment Tarbiat Modares University Tehran 14115116 Iran Nuclea. Science a.d Technology Resea.ch Institute Tehran 113658486 Iran

This resea.ch a.med to enha.ce the column biolea.hing recovery of ura.ium ore by a.idithioba.illus *** fa.tors were exa.ined for their significa.ce on biolea.hing using a.Pla.kett-Burma. fa.toria. *** significa.t va.ia.les([Fe2+]initia.,pH,a.ra.ion ra.e a.d inocula.ion percent)were selected for the optimiza.ion *** effect of these va.ia.les on ura.ium biolea.hing wa. studied using a.centra. composite design(CCD).The optima. va.ues of the va.ia.les for the ma.imum ura.ium biolea.hing recovery(90.27±0.98)%were a. follows:[Fe2+]initia.=2.89g/L,a.ra.ion ra.e420mL/min,pH1.45a.d inocula.ion6%(v/v).[Fe2+]initia. wa. found to be the most effective *** ma.imum ura.ium recovery from the predicted models wa.92.01%.This va.ue wa. in a.reement with the a.tua. experimenta. *** a.a.ysis of biolea.hing residue of ura.ium ore under optimum conditions confirmed the forma.ion of K-ja.osite on the surfa.e of *** using optima. conditions,ura.ium biolea.hing recovery is increa.ed a. column a.d ja.osite precipita.ion is *** kinetic model showed tha. ura.ium recovery ha. a.direct rela.ion with ferric ion concentra.ion.

关键词： column biolea.hing ura.ium ore screening optimiza.ion kinetic model a.idithioba.illus ferrooxida.s

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Na.o-microbubble flota.ion of fine a.d ultra.ine cha.copyrite pa.ticles

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Interna.iona. Journa. of Mining Science a.d Technology 2014年第4期24卷 559-566页

作者： a.ma.i Ra.ma. khodadadi darban a.ma. a.dolla.y Ma.moud Fa. Ma.ming Depa.tment of Minera. Processing Engineering Tarbiat Modares University EFD Eriez Manufacturing Co.

a. is well known to minera. processing scientists a.d engineers, fine a.d ultra.ine pa.ticles a.e difficult to floa. ma.nly due to the low bubble-pa.ticle collision efficiencies. Though ma.y efforts ha.e been ma.e to improve flota.ion performa.ce of fine a.d ultra.ine pa.ticles, there is still much more to be done. In this pa.er, the effects of na.o-microbubbles （na.obuhbles a.d microbubbles） on the flota.ion of fine （-38 ＋ 14.36 μm） a.d ultra.ine （-14.36 ＋ 5μm） cha.copyrite pa.ticles were investiga.ed in a.la.ora.ory sca.e Denver flota.ion cell. Na.o-microbubbles were genera.ed using a.specia.ly-designed na.o- microbubble genera.or ba.ed on the ca.ita.ion phenomenon in Venturi tubes. In order to better under- sta.d the mecha.isms of na.o-microbubble enha.ced froth flota.ion of fine a.d ultra.ine cha.copyrite pa.ticles, the na.o-microbubble size distribution, sta.ility a.d the effect of frother concentra.ion on na.o- bubble size were a.so studied by a.la.er diffra.tion method. Compa.a.ive flota.ion tests were performed in the presence a.d a.sence of na.o-microbubbles to eva.ua.e their impa.t on the fine a.d ultra.ine cha.copyrite pa.ticle flota.ion recovery. a.cording to the results, the mea. size of na.o-microbubbles increa.ed over time, a.d decrea.ed with increa.e of frother concentra.ion. The la.ora.ory-sca.e flota.ion test results indica.ed tha. flota.ion recovery of cha.copyrite fine a.d ultra.ine pa.ticles increa.ed by a.proxima.ely 16-21% in the presence of na.o-microbubbles, depending on opera.ing conditions of the process. The presence of na.o-microbubbles increa.ed the recovery of ultra.ine pa.ticles （-14.36 ＋ 5 μm） more tha. tha. of fine pa.ticles （-38 ＋ 14.36 μm）. a.other ma.or a.va.ta.e is tha. the use of na.o-microbubbles reduced the collector a.d frother consumptions by up to 75% a.d 50%, respectively.

关键词： Na.obubbles Na.o-microbubble Bubble size distribution Cha.copyrite Froth flota.ion Fine pa.ticles

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