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]quinazolin- 6(7H)-one dissolved in methylene chloride. It has been found that extraction efficiency of 84% was achieved by contacting equal volumes of 0.32% extractant with 4.5 mol/L sulfate solution for 15 min. The stripping was performed by 0.5 mol/L HF with efficiency of 86.7%. Key words: extraction; niobium; triazoloquinazolinone; stripping efficiency  ......
. The effects of coal fly ash size, sulfuric acid concentration, reaction time and reaction temperature on extraction efficiency of aluminum were investigated comprehensively. The phase and morphology... fly ash with size of 74 μm and sulfuric acid with concentration of 50% are mixed in pressure reaction kettle to react for 4 h at 180 ℃. Under the optimal conditions, the extraction efficiency......
J. Cent. South Univ. Technol. (2007)06-0798-05 DOI: 10.1007/s11771-007-0152-7 Synthesis of calixarenes and their extraction performance for ester catechins YI Jian-min(易健民)1,2... of calixarene was studied. The influences of different extractants, concentration of tert-butylcalix[8]arene and extraction temperature on the partition coefficients and the separation factors were......
of equilibration temperature and time It is desirable to employ the lowest possible equilibration temperature and the shortest time without a significant compromise in extraction efficiency. Theoretically... extraction, and the extraction efficiency has no considerable enhancement for longer incubation time. 3.3 Effect of pH BPA has two phenolic hydroxyl groups whose disassociation constants pKa is from 9.6......
; Novel histogram descriptor for global feature extraction and description ZHANG Gang(张 刚)1, 2, MA Zong-min(马宗民)1, DENG...; Abstract: A novel histogram descriptor for global feature extraction and description was presented. Three elementary......
% and 95.6%, respectively, under the optimal condition in the leaching process. Aliquat 336 showed excellent extraction performance of iron in chloride-rich solution, and the maximum extraction efficiency can... temperature vibrator for a certain time at room temperature (30 °C). After phase disengagement, the aqueous phase was taken and analyzed by ICP-AES. The extraction efficiency (η) of metals was calculated......
. Under these optimized conditions, the average leaching efficiency of nickel is 89.3%. The nickel extraction efficiency in the examined conditions is about 99.6%, and the nickel stripping efficiency... and nickel leaching efficiency of 84.0% is obtained. Segregation roasting by pulverized coal or graphite gives much lower nickel extraction, varying from 28.1% to 69.0%. Generally, the reducing......
of RA-LFS were calcium(type of CaO, 53.9 wt%) and aluminum(type of Al2 O3, 37.9 wt%), and the major crystal phases of RA-LFS were C3 S, C12 A7, and C3 A. The calcium extraction efficiency of RA-LFS...CaCO3 film synthesis from ladle furnace slag: morphological change, new material properties, and Ca extraction efficiencySeung-Woo Lee1,Yong-Jae Kim2,Jun-Hwan Bang1,Soochun Chae11. Center for carbon......
by reduction process, solvent extraction, precipitating vanadium with ammonium water, and pyrolysis from the stone-coal oxygen pressure acid-leaching solution. The total recovery efficiency of vanadium... efficiency of vanadium would exceed 99% when 15% H2SO4 solution is taken as the stripping agent. By way of extraction, the concentration of vanadium could be raised to 37 g/L or more......