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Dialysate tank; 5 Pump; 6 Membrane stacks 3.1 Cycling operation The volume and sulfuric acid concentration of feed are V1 and c1,i, those of dialyzate are V2 and c2,i, the mass transfer of sulfuric acid is mt, the effective membrane area is A, the mass transfer coefficient is U0, and the thickness of the membrane is d. The difference of sulfuric acid concentration between feed......
leaching process[13-15]. In this work, the high pressure acid leaching is adopted to extract nickel and cobalt from laterite ore. The effects of various parameters including sulfuric acid added, leaching... Results and discussion 3.1 Effect of sulfuric acid added on metal extraction A series of high pressure leaching experiments were carried out by varying the addition of sulfuric acid from 125 kg/t ore......
returns to extraction circularly.Key words:gallium; HBL121 extractant; zinc replacing slag; high concentration sulfuric acid leaching liquor; extraction; Stripping...;HBL121 萃取剂;锌置换渣;高浓度硫酸浸出液;萃取;反萃Extraction of gallium from high concentration sulfuric acid leaching solution of zinc replacing slag by HBL121ZHANG Kui-fang,CAO Zuo-ying,XIAO Lian-sheng,ZENG Li,ZHANG Gui......
tungsten recovery was very satisfactory (up to 97%) at high acid concentrations (above 3.5 mol/L). By contrast, the leaching ratio was always below 90% at lower acid concentration (2.5 mol/L), even at relatively high temperature (90 °C). A series of leaching tests was implemented with different HNO3 concentrations to determine the effect of HNO3 concentration at 70 °C and 80 °C. It was observed......
. The effects of the dosage of pyrolysis-pretreated sawdust to pyrolusite ore, the concentration of sulfuric acid, the liquid/solid ratio, the leaching temperature, and the leaching time on manganese...Reductive leaching of manganese from low-grade pyrolusite ore in sulfuric acid using pyrolysis-pretreated sawdust as a reductantYa-li Feng1,Shi-yuan Zhang1,2,Hao-ran Li21. School of Civil......
J. Cent. South Univ. (2020) 27: 27-36 DOI: https://doi.org/10.1007/s11771-020-4275-4 Kinetics of leaching lithium from lepidolite using mixture of hydrofluoric and sulfuric acid WANG Hai-dong(王海东)1... shows great potential in leaching lithium (Li) from lepidolite. Leaching kinetics of Li in a mixture of sulfuric acid and hydrofluoric acid, which is a typical lixivant for the fluorine-based chemical......
Reductive leaching of indium from the neutral leaching residue using oxalic acid in sulfuric acid solutionF.Maddah,M.Alitabar,H.YoozbashizadehDepartment of Materials Science and Engineering, Sharif... in sulfuric acid solution. The effect of main factors affecting the process rate, including the oxalic-acid-to-sulfuric-acid ratio, stirring rate, grain size,temperature, and the initial concentration......
activation was employed during the leaching(mechanochemical leaching) of chalcopyrite concentrates in a sulfuric acid medium at room temperature and atmospheric pressure. High energy ball milling process...Mechanochemical leaching of chalcopyrite concentrate by sulfuric acidFarhad Khorramshahi Mohammadabad1,Sina Hejazi2,Jalil Vahdati khaki1,Abolfazl Babakhani11. Materials and Metallurgical Engineering......
of vanadium, were investigated[12-14]. The results showed that under the conditions of leaching time of 3-4 h, temperature of 150 ℃, sulfuric acid consumption of 25%-30%, ratio of liquid to solid... recovery The high concentration of sulphuric acid in leachate would increase the addition of antalkali and ammonia, so it is very necessary to reprocess this solution before extracting vanadium. Many......