|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Comparative analysis of the dissolution kinetics of galena in binary solutions of HCl/FeCl_3 and HCl/H_2O_2显示文摘A comparative study of the dissolution kinetics of galena ore in binary solutions of FeCl3/HCl and H2O2/HCl has been undertaken.The dissolution kinetics of the galena was found to depend on leachant concentration,reaction temperature,stirring speed,solid-to-liquid ratio,and particle diameter.The dissolution rate of galena ore increases with the increase of leachant concentration,reaction temperature,and stirring speed,while it decreases with the increase of solid-to-liquid ratio and particle diameter.The activation energy (Ea) of 26.5 kJ/mol was obtained for galena ore dissolution in 0.3 M FeCl3 /8.06 M HCl,and it suggests the surface diffusion model for the leaching reaction,while the Ea value of 40.6 kJ/mol was obtained for its dissolution in 8.06 M H2O2 /8.06 M HCl,which suggests the surface chemical reaction model for the leaching reaction.Furthermore,the linear relationship between rate constants and the reciprocal of particle radius supports the fact that dissolution is controlled by the surface reaction in the two cases.Finally,the rate of reaction based on the reaction-controlled process has been described by a semiempirical mathematical model.The Arrhenius and reaction constants of 11.023 s 1,1.25×10 4 and 3.65×10 2 s 1,8.02×10 6 were calculated for the 0.3 M FeCl3/8.06 M HCl and 8.06 M H2O2/8.06 M HCl binary solutions,respectively. | Alafara A.Baba Folahan A.Adekola | 2011 | International Journal of Minerals,Metallurgy and Materials2011，18，1： | 4 |
| 2 | Dissolution kinetics of kaolin mineral in acidic media for predicting optimal condition for alum production显示文摘The dissolution kinetics and mechanisms of reaction of Batagbon Kaolin in sulphuric and fluosilicic acids were studied. Leaching temperature, acid concentration, particle size, solid-to-liquid ratio, and stirring speed were selected as process parameters. It is observed that the dissolution rate increases with decreasing particle size and solid-to-liquid ratio, and increases with stirring speed, acid concentration, and leaching temperature. The experimental results indicate that the dissolution rate is of mixed control via hydrogen ion [H^+] action, with reaction order of 0.813 and the reaction kinetics can be expressed as K_mt=[1-(1-x)^(1/3)+y/6[(1-x)^(1/3)+ 1-2(1-x)^(2/3)]. The activation energy of the process is determined to be 21.6 k J/mol. The level of the product quality is also evaluated. | Folahan A.ADEKOLA Alafara A.BABA Sadisu GIRIGISU | 2017 | Journal of Central South University2017，24，2： | 1 |
| 3 | Hydrometallurgical application for treating a Nigerian chalcopyrite ore in chloride medium:Part I.Dissolution kinetics assessment显示文摘The dissolution kinetics of a Nigerian chalcopyrite ore in hydrochloric acid was studied in this article.Acid concentration,reaction temperature,and ore particle size were chosen as experimental parameters.The chemical and morphological studies of the ore before and after leaching at optimal conditions were carried out by X-ray difraction(XRD)and scanning electron microscopy(SEM).It is revealed that increasing the acid concentration and system temperature and decreasing the ore particle size greatly enhances the dissolution rate.The dissolution kinetics was found to follow the shrinking core model for the difusion control mechanism where the activation energy(Ea)of 32.92 kJ·mol 1was obtained for the process and supported by morphological changes at a higher dissolution of 91.33%. | Alafara A.Baba Kuranga I.Ayinla Folahan A.Adekola Rafiu B.Bale Malay K.Ghosh Abdul G.F.Alabi Abdul R.Sheik Ismael O.Folorunso | 2013 | International Journal of Minerals,Metallurgy and Materials2013，20，11： | 1 |
| 4 | 显示文摘 | Alafara A.Baba Folahan A.Adekola | 2011 | International Journal of Minerals Metallurgy and Materials2011，，01： | 1 |
| 5 | 利用嗜酸混合菌从尼日利亚闪锌矿和方铅矿中生物浸出Zn(Ⅱ)和Pb(Ⅱ)(英文)显示文摘利用嗜酸混合菌在尼日利亚闪锌矿和方铅矿中生物浸出Zn(Ⅱ)和Pb(Ⅱ),研究pH值和铁离子对闪锌矿和方铅矿浸出率的影响。结果表明:闪锌矿和方铅矿中Zn(Ⅱ)和Pb(Ⅱ)的氧化物在pH值分别为2.1和2.7时浸出效果最好。用模拟的琼脂糖培养基使细胞分泌出含铁离子的外聚合物,以此加强氧化。闪锌矿和方铅矿达到氧化平衡分别需要3和4d。闪锌矿和方铅矿在1d内的浸出率分别为38.3%和34.2%,5d内Zn(Ⅱ)和Pb(Ⅱ)分别还原92.0%和89.0%。使用XRD研究两种矿物的未浸出的剩余产物,闪锌矿的组成为S、ZnSO4和少量Ca3Al2O6,方铅矿的组成为S、PbSO4和少量的Pb(S,Ge)(O,OH)4和Pb8Co(Si2O7)3。 | Alafara A.BABA Folahan A.ADEKOLA Rasaq F.ATATA Risikat N.AHMED Sandeep PANDA | 2011 | Transactions of Nonferrous Metals Society of China2011，21，11： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员