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| 1 | Nano-microbubble flotation of fine and ultrafine chalcopyrite particles显示文摘As is well known to mineral processing scientists and engineers, fine and ultrafine particles are difficult to float mainly due to the low bubble-particle collision efficiencies. Though many efforts have been made to improve flotation performance of fine and ultrafine particles, there is still much more to be done. In this paper, the effects of nano-microbubbles(nanobubbles and microbubbles) on the flotation of fine( 38 + 14.36 lm) and ultrafine( 14.36 + 5 lm) chalcopyrite particles were investigated in a laboratory scale Denver flotation cell. Nano-microbubbles were generated using a specially-designed nanomicrobubble generator based on the cavitation phenomenon in Venturi tubes. In order to better understand the mechanisms of nano-microbubble enhanced froth flotation of fine and ultrafine chalcopyrite particles, the nano-microbubble size distribution, stability and the effect of frother concentration on nanobubble size were also studied by a laser diffraction method. Comparative flotation tests were performed in the presence and absence of nano-microbubbles to evaluate their impact on the fine and ultrafine chalcopyrite particle flotation recovery. According to the results, the mean size of nano-microbubbles increased over time, and decreased with increase of frother concentration. The laboratory-scale flotation test results indicated that flotation recovery of chalcopyrite fine and ultrafine particles increased by approximately 16–21% in the presence of nano-microbubbles, depending on operating conditions of the process. The presence of nano-microbubbles increased the recovery of ultrafine particles( 14.36 + 5 lm) more than that of fine particles( 38 + 14.36 lm). Another major advantage is that the use of nano-microbubbles reduced the collector and frother consumptions by up to 75% and 50%,respectively. | Ahmadi Rahman Khodadadi Darban Ahmad Abdollahy Mahmoud Fan Maoming | 2014 | International Journal of Mining Science and Technology2014，24，4： | 28 |
| 2 | 采用工艺优化和动力学模型提高铀矿生物柱浸的回收率(英文)显示文摘采用嗜酸氧化亚铁硫杆菌提高轴矿的生物柱浸回收率,利用Plackett-Burman因子设计法研究七因素对铀矿生物柱浸显著性的影响。选取[Fe^(2+)]_(initial)、pH值、通气速率和接种率4个显著性参数进行优化试验,采用一种中心复合设计法研究这些参数对铀矿生物浸出的影响。铀矿生物浸出率最大时((90.27±0.98)%)对应的优化参数如下:[Fe^(2+)]_(initial)=2.89 g/L、通气速率420 mL/min、pH 1.45、接种率6%(体积分数)。[Fe^(2+)]_(initial)对铀矿生物浸出的影响最大。由预测模型得到铀的最大回收率为92.01%,此数据与实验所得结果吻合较好。最佳浸出条件下铀矿浸出渣的分析结果表明,矿物表面形成了黄钾铁矾。最佳浸出条件下铀的生物柱浸率提高,黄钾铁矾沉淀量减少。动力学模型预测结果表明,铀的回收率与Fe^(2+)浓度密切相关。 | H. ZARE TAVAKOLI M. ABDOLLAHY S. J. AHMADI A. KHODADADI DARBAN | 2017 | Transactions of Nonferrous Metals Society of China2017，27，12： | 4 |
| 3 | Determination of crack tip parameters for ASCB specimen under mixed mode loading using finite element method显示文摘 | DARBAN H HAGHPANAHI M ASSADI A | | 0，，： | 1 |
| 4 | The relationships of time and temperature to body weight and numbers of endospores in Pasteuria penetrans-infected Meloidogyne javanica females显示文摘 | Darban D A Pembroke B Gowen S R | 2004 | Nematology2004，6，1： | 1 |
| 5 | Recovery of metal from low grade oxide minerals by using Aspergillus niger显示文摘 | Darban A K Shojaosadati A Yaraghi A | | 0，，： | 1 |
| 6 | Synthesis of nano-alumina powder from impure kaolin and its applica- tion for arsenite removal from aqueous solutions 显示文摘 | Darban A K Kianinia Y Taheri Nassaj E | 2013 | Journal of Environmental Health Sciences ~ Engineer- ing2013，11，1： | 1 |
| 7 | The effect of geosynthetic reinforcement on the damage propagation rate of asphalt pavements显示文摘 | Hosseini H R A Darban A K Fakhri K | 2009 | Scientia Iramica2009，16，1： | 1 |
| 8 | The relationships of time and temperature to body weight and numbers of endo- spores in Pasteuria penetrans-infected Meloidogyne javanica females 显示文摘 | Darban D A Pembroke B Gowen S R | 2004 | Nematology2004，6，1： | 1 |
| 9 | Development of Pasteuria penetrans in Meloidogyne javanica females as affected by constantly high vs fluctuating temperature in an in-vivo system显示文摘Growth room and glasshouse experiment was conducted to investigate the effect of constant and fluctuating tem- peratures on the development of Pasteuria penetrans a hyperparasite of root-knot nematodes. Tomato plants (Lycopersicon es- culentum Mill) were inoculated with Meloidogyne javanica second-stage juveniles attached with endospores of P. penetrans and were grown in growth room at 26?29 °C and in glasshouse at 20?32 °C. The tomato plants were sampled from the growth room after 600 degree-days based on 17 °C/d, accumulating each day above a base temperature of 10 °C and from the glasshouse after 36 calendar days. Temperature affected the development of P. penetrans directly. The rate of development at constant temperature in growth room was faster than that in the glasshouse at fluctuating temperatures. | DARBAN D.A. GOWEN S.R PEMBROKE B. MAHAR A.N | 2005 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2005，6，3： | 0 |
| 10 | The effect of different initial densities of nematode (Meloidogyne javanica) on the build-up of Pasteuria penetrans population显示文摘Pasteuria penetrans will build-up faster where there is a high initial nematode density and can suppress root-knot nematode populations in the roots of tomato plants. The effect of different initial densities of nematode (Meloidogyne javanica)(150, 750, 1500, 3000) and P. penetrans infected females (F1, F3) densities (F0=control and AC=absolute control without nematode or P. penetrans inoculum) on the build-up of Pasteuria population was investigated over four crop cycles. Two major points of interest were highlighted. First, that within a confined soil volume, densities of P. penetrans can increase >100 times within 2 or 3 crop cycles. Second, from a relatively small amount of spore inoculum, infection of the host is very high. There were more infected females in the higher P. penetrans doses. The root growth data confirms the greater number of females in the controls particularly at the higher inoculum densities in the third and fourth crops. P. penetrans generally caused the fresh root weights to be higher than those in the control. P. penetrans has shown greater reduction of egg masses per plant at most densities.The effects of different initial densities of M. javanica and P. penetrans on the development of the pest and parasite populations were monitored. And no attempt was made to return the P. penetrans spores to the pots after each crop so the build-up in actual numbers of infected females and spores under natural conditions may be underestimated. | DARBAN Daim Ali PATHAN Mumtaz Ali BHATTI Abdul Ghaffar MAITELO Sultan Ahmed | 2005 | Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2005，6，2： | 0 |
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