17 KB164 KB14 KB200020242013Chi, Ru'anDeng, XiangyiDing, YigangLi, WenZhang, L.Zuo, Xiaohuaštevilka:2letnik:47str. 145-148ISSN:1580-2949COBISSID:976810URN:URN:NBN:SI:doc-QRTXCUQTenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijekemijska kinetikaluženjeredke zemljerudaKinetics of weathered-crust elution-deposited rare-earth ore in a leaching process| Kinetika postopka luženja elucijsko nanesene preperele skorje rude redkih zemelj|The leaching reaction kinetics of weathered-crust, elution-deposited rare earth with mixed ammonium salts was studied. The influence of the concentration of the reagents and the particle size of the ore on the leaching rate was investigated. The results showed that the diffusion process and the leaching rate could be improved by increasing the reagent concentration and decreasing the leaching flowing rate and particle size. The leaching process could be explained using the shrinking-core model, which could be controlled with the diffusion rate of the reacting reagents in a porous solid layer. The leaching rate followed the equation 1-2/3eta - (1 - etasup{2/3} = 7.126 x 10sup{-4}Csup{0.3038}Rsup{0.1942}tProučevana je kinetika reakcije luženja preperele skorje elucijsko nanesene rude redkih zemelj. Preiskovan je bil učinek koncentracije reagentov in velikosti zrn rude na hitrost luženja. Rezultati so pokazali, da je mogoče proces difuzije in hitrost luženja povečati s povečanjem koncentracije reagentov ter z zmanjšanjem hitrosti luženja in zmanjšanjem velikosti delcev. Postopek luženja se lahko razloži z modelom krčenja jedra, ki ga je mogoče kontrolirati s kontroliranjem hitrosti difuzije reagentov, ki reagirajo v poroznem trdnem sloju. Hitrost luženja je skladna z enačbo 1 - 2/3eta - (1 - eta){2/3} = 7,126 x 10-4Cna{0,3038}Rna{0,1942}tTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije