共搜索到7302条信息，每页显示10条信息，共731页。用时：0小时0分0秒525毫秒
Separation of rare earth elements from sulfate leach liquor by heterocyclic nitrogen compoundGHADA M. Mahmoud,NABIL T. El Hazek,AHMAD M. Farag,OMNEYA M. El Hussaini摘 要:acid leaching......
Separation of rare earth elements from sulfate leach liquor by heterocyclic nitrogen compound OMNEYA M.El Hussaini1,NBIL T.El Hazek1,GHADA M.Mahmoud1,AHMAD M.Farag2 (1.Nuclear Materials Authority... minerals: Samarskite, Fergusonite, Betafite, and Pyrochlore, was subjected to sulfuric acid leaching. Different sets of equilibrium loading experiments were carried out on a bench scale......
to sulfuric acid leaching using acid concentrations varied from 17.6 to 4.5 mol/ L. The extraction of niobium from the sulfate leach liquors was done using the synthesized 8,9-dihydro[1,2,4]triazolo[1,5-a... of different extraction conditions in improving niobium extraction efficiency from the sulfate leach liquor. 3.2 Effect of sulfuric acid concentration Four leach liquors were prepared by digesting......
], sulfosalicylic acid [35], zwitterionic reagent [36] has been reported to leach zinc from zinc or lead-zinc oxide and copper oxide ores. With the use of sulfuric acid solutions as lixiviant, the reports show... leaching stage, 82.3% Zn was selectively taken into the leach solution, leaving a substantial amount of iron (99.5%) and lead (99.7%) in the leach residue. (2) The sulfuric acid consumption......
J. Cent. South Univ. (2012) 19: 71-76 DOI: 10.1007/s11771-012-0974-9 Oxygen pressure acid leaching of Gacun complex Cu concentrates XU Bin(徐斌)1, 2, ZHONG Hong(钟宏)3, JIANG Tao(姜涛)1 1. School... with high contents of Pb, Zn, Ag, etc by oxygen pressure acid leaching was studied. It is unusual that tetrahedrite, whose treatment was rarely studied, is the primary copper mineral of the concentrates......
......
, such as microwave roasting[14] and calcified roasting[15]. The acid leaching after oxidation roasting without additives is a promising technique to leach vanadium from stone coal in an environmental-friendly... the amount of sulfuric acid available, the vanadium concentration in the leach liquor decreases with an increase of the liquid-to-solid ratio. Too low concentration of vanadium in the leach liquor......
in leach residue are quartz and small amounts of undissolved oxide minerals of iron, lead and aluminum are associated with quartz. 4) Sulfuric acid pressure leaching of zinc silicate ore is a viable... and mechanism study on leaching high silicon zinc oxide ore with sulfuric acid [J]. Nonferrous Metal (Smelting Section), 2003(5): 9-23. (in Chinese) [4] DUFRESNE R E. Quick leach of siliceous zinc ore......
) spent heap leach dumps. Chemical quality of ARD can vary and is dictated by physical, chemical, mineralogical and microbiological properties of each site. The primary requirements for acid generation... Microbial aspects of acid mine drainage and its bioremediation K.A. NATARAJAN Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India Received......
J. Cent. South Univ. (2016) 23: 39-43 DOI: 10.1007/s11771-016-3046-8 Kinetic study on leaching of nickel from Turkish lateritic ore in nitric acid solution Tevfik AGACAYAK, Veysel ZEDEF, Ali ARAS... of nickel from lateritic ore in nitric acid solution was investigated. Experimental parameters used were stirring speed (100-600 r/min), temperature (40-96 °C), nitric acid concentration (0.1-2 mol/L......
