The precipitation of tannin complex of germanium from sulfuric solutions obtained after dross leaching was investigated. The tested solutions contained mainly zinc, germanium, indium, and tin. The influence of temperature, time, amount of added tannic acid and its purity was determined. The application of pure tannic acid allowed the precipitation of >99% of germanium and decreased its ...
Testing showed that the insoluble germanium in both the residue and ore was tied up with silica. Several methods for overcoming this problem are given. To recover gallium and germanium from the leach solutions, the solvent extractants octylphenyl acid phosphate (OPAP) (for gallium) and lix 63-OPAP (for germanium) were identified.
adding an alkali to, and leaching, a gallium-containing jarosite to form a leached solution, which contains gallium, thereby separating at least iron from the gallium; and . adding magnesium hydroxide to the leached solution, thereby separating at least germanium from the gallium. 5. A method for separating gallium from other components of a ...
Increasing Germanium Extraction. A sulfuric acid leach technique for extracting gallium and germanium from Apex ore without the use of a reducing agent, such as SO2, was investigated. Leaching studies showed that with increasing sulfuric acid concentrations, gallium extraction increased to over 95%, while germanium extraction reached a peak of ...
Sources of germanium and gallium are discussed and descriptions are given of processes for the recovery of these elements from flue dusts and from germanite. The flue‐dust process involves smelting to recover the rare elements in a metallic regulus, dissolution of this regulus in ferric chloride solution with the aid of chlorine, distillation ...
Extracting Gallium and Germanium from Zinc-leaching Residues by Hot-acid Leaching Process MA Xi-hong,QIN Wen-qing,WU Xue-lan,REN Liu-yi(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)
Leach temperature has a marked effect on both gallium and germanium ex-traction when leaching with sulfur dioxide (Figure 6). Samples were leached with 800 lb./ton sulfuric acid, and 2.9 (lb.zmin.i/ton S02 for four hours while the tem- perature remained at a selected temperature between 25 and 90°C.
Zinc, copper, indium, gallium and germanium dissolution rates were rather identical with both methods. In reactor experiments, the zinc and copper yields were higher than in flask experiments resulting at best in the leaching yield of 35% and 38% for zinc and copper, respectively.
Patents for C22B 58 - Obtaining gallium or indium (821) 12/2013: 12/25/2013: CN103468977A Method for selectively leaching germanium and gallium from complex smelting slag with germanium and ...
leaching of zinc sulfide concentrate was carried out in order to investigate the effect of pressure, leaching time, sulfuric acid and copper concentrations on the leaching behavior of gallium and germanium. Under optimum conditions, leaching of Zn, Fe, Ge and Ga reached 98.21, 90.45, 97.45 and 96.65%, respectively.
gallium and germanium. This report is divided into six sections: (1) identifi cation of domestic sources, (2) leaching of a zinc residue, (3) leaching of a gallium-germanium ore, (4) galIium sol vent extraction, (5) germanium solvent extraction, and (6) germanium and gallium coextraction. IDENTIFYING DOMESTIC SOURCES
Abstract: In this research, gallium and germanium were separated and recovered from zinc refinery residues by a two-stage leaching. In the first leaching stage with sulfuric acid media, 92% of zinc and 94% of copper were leached resulting in significant gallium and germanium enrichment up to ca. 300%.
As seen, leaching the H2SO4-leached residue with 250 kg/mt HF for 2 h at 80°C and 10% pulp solids extracted 93 % of the remaining germanium, bringing total germanium extraction from approximately 70 to 98%. (The high cost of HF could make this alternative less viable.) Modify the two-stage zinc leaching procedure.
acid leach technique for extracting gallium and germanium from the Apex mine ore. The study indicated that by using a two-stage counter-current sulfuric acid leach system, optimum extraction of gallium increased to over 95 percent while ger- manium extraction reached a peak of 71 percent after which it decreased to less then 50 percent.
A method of leaching gallium or germanium compounds from an ore containing gallium compounds, germanium compounds or mixture thereof, said method comprising: placing said ore into an admixture comprising a culture medium and bacteria having deposit accession number ATCC 53921 for a sufficient amount of time to allow said bacteria to leach ...
XRD pattern of the leaching residue demonstrated that ZnSO 4 ·H 2 O, PbSO 4 and SiO 2 were removed sequentially through the stepwise leaching. The proposed process achieved high recoveries of Zn, Pb, Ga and Ge, thus presenting a potential industrial application. Key words: zinc refinery residues; gallium; germanium; stepwise leaching
development and marketing of the germanium/gallium medical isotope generator. During production of 68Ge the following isotopes are coproduced: 65Zn (Zinc-65), T1/2 = 244 days and trace quantities of radioactive cobalt. To isolate 68Ge from the Gallium target material a two-step process is used which involves leaching 68Ge from natural gallium ...
A high temperature process for leaching selected metal compounds, such as gallium or germanium, from ores containing those selected metal compounds is disclosed. The method generally includes contacting metal-containing ores with an admixture of nutrient medium and bacteria capable of leaching selected metal compounds contained in the ore.
lead to Germanium-68 (Ge-68) contaminating the Ga-68 radiopharmaceutical and potentially causing an unnecessarily high radiation exposure to patients. 10 CFR 35.204 provides permissible concentration limits for parent radionuclides for Mo-99/Tc-99m and Sr-82/Rb-82 generators to limit such exposure, but no such limit is specified for Ge-
In the second leaching stage with oxalic acid media, the effects of H 2 C 2 O 4 concentration, leaching time, liquid-to-solid (L/S) ratio and temperature on the recovery of gallium and germanium were investigated. More than 96% of gallium and 99% of germanium were leached out using 70 g/L H 2 C 2 O 4 with a L/S ratio of 10 at 90 °C for 2 h.
A SX process was developed to extract germanium and gal- leaching step is usually treated in a hydrometallurgical process to se- lium anionic species from aqueous solutions of the zinc refinery residue parate germanium from other impurities such as molybdenum, nickel, leaching step using N235 mixed with TBP (Liu et al., 2017).
No Hot Acid Leach scenarios could be developed or used for any recovery of gallium from Clarksville residue (in the case of Clarksville, a hot acid leach or HAL is any leaching with acid where the leaching process starts at a temperature of 80˚ Celsius or higher). Based on this comment, the following alternatives were identified and researched:
The U.S. Bureau of Mines recently investigated sulfuric acid leaching to extract gallium and germanium from a zinc processing residue containing 0.32% Ga and 0.46% Ge. These metals can be extracted by leaching with sulfuric acid alone or by leaching with sulfuric acid and sulfur dioxide. A low temperature roasting treatment also aids in extracting 20% more germanium.
The invention belongs to the metallurgical industry, and particularly relates to a method for enrichment and recovery of gallium and germanium from raffinate of an indium smelting system. A neutralizing agent is added into indium raffinate in the production of indium by using a zinc smelting system for preneutralization to remove a large amount of free sulfuric acid in the solution, the ...
Germanium (von lateinisch Germania ‚Deutschland', nach dem Land, in dem es zuerst gefunden wurde) ist ein chemisches Element mit dem Elementsymbol Ge und der Ordnungszahl 32. Im Periodensystem steht es in der 4. Periode und in der 4. Hauptgruppe (14. IUPAC-Gruppe, p-Block und Kohlenstoffgruppe).Es wurde erstmals 1886 im Mineral Argyrodit nachgewiesen.
The U.S. Bureau of Mines studied the extraction of gallium and germanium from hydrometallurgical zinc processing residues. Statistically designed experiments showed that the most significant variables were h2so4 concentration for gallium extraction and pulp- solids density for germanium extraction. Leaching the residue with 2,000 lb h2so4/st residue for 4.5 H at 80 deg. C using 20 pct pulp solids
Recycling von Gallium, Germanium und Indium Deutscher Rohstoffeffizienz-Preis 2012, 29. November 2012 Dr. Ulrich Kammer PPM Pure Metals 29.11.2012 .
Leaching/Etching of GaAs Semiconductors and the Importance of the pH and Redox Potential Since gallium is present as GaAs in smartphones and also in the pyrolysis fines (the present input material), the required conditions for a successful dissolution of Ga and GaAs are discussed.
Recovery of gallium and vanadium from gasification fly ash RECOVERY OF GE -68 FROM TARGET COOLING WATER Recovery of germanium from synthetic leach solution of zinc refinery residues by synergistic solvent extraction using LIX 63 and Ionquest 801
The effects of initial acid concentration, temperature, SO2 partial pressure, ratio of liquid to solid and stirring speed on leaching rate of gallium and germanium were studied. The results show that the total leaching rate of zinc, iron, gallium and germanium were 92.79%, 97.87%, 94.09% and 75.18% respectively after the acid leaching in high ...
