U.S. Pat. No. 4,666,686 (1987, Krajewski, et al) discloses extraction of gallium, germanium or indium from basic or acidic solution with an organic phase containing at least Kelex 100 and LIX 26. The organic phase may also contain tri-n-octylphosphine oxide.
L'invention concerne un procédé pour l'extraction sélective du germanium d'une solution acide aqueuse contenant, outre le germanium, au moins un autre métal choisi dans le groupe constitutué par le cadmium, le zinc, le cobalt, le fer, l'arsenic, l'aluminium, le gallium, le cuivre et le nickel. Ce procédé comporte : a) une extraction du germanium par mise en contact de ladite solution ...
Extraction of gallium and germanium from zinc refinery residues by pressure acid leaching Article in Hydrometallurgy 164 · June 2016 with 242 Reads How we measure 'reads'
Figure 3 shows germanium extraction versus HF addition for zinc residue which had previously been leached with H2SO4. 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%.
Problems with coextraction of iron can be avoided with prior Fe (Ill) reduction. Gallium solvent extraction with D2FHP~ has also been tried in a sulphuric acid leach-based process for recovering gallium and germanium from ore con- taining about 0.04% Go, and mined from the Apex Mine, Utah [35].
ux by extracting and counting the germanium atoms produced in the gallium tanks. (See Figure 1.) About once a month, a chemical extraction is performed in which individual germanium-71 (71 Ge) atoms are plucked from among some 5 3 10 29 gallium atoms. (Only 1.2 71 Ge atoms are predicted to be produced per day in 30 tons of gallium, assuming the ...
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.
Gallium is recovered from the acid liquor in the first still by treatment with aluminium to remove heavy metals and to reduce the iron to ferrous chloride, followed by extraction of the gallium chloride in a continuous process with isopropyl ether, removal of the ether by distillation, purification of the aqueous phase with hydrogen sulphide ...
Germanium Gallium Ore Leaching with Sulfuric Acid. For optimum gallium and germanium extraction, a two-stage counter-current leach system was devised to adequately control the solution acidity. At operating conditions of 1,000 kg H2SO4/mt ore, 20 % solids, and 90 °C, 96% of the gallium and 85% of the germanium in the ore were extracted.
Gallium. Part II. The extraction of gallium and germanium from germanite F. Sebba and W. Pugh Abstract. The first page of this article is displayed as the abstract. About. Cited by ... Gallium. Part II. The extraction of gallium and germanium from germanite F. Sebba and W. Pugh, J. …
Clarksville gallium/germanium residue(1,2). The gallium recovery processes used the following methods: • An acid leach circuit to dissolve the gallium and germanium, • Conversion the leached iron from ferric to ferrous, • Recovery of the gallium with a solvent extraction approach, • Strip of the gallium from the solvent extraction . Get ...
Gallium is a chemical element with the symbol Ga and atomic number 31. Elemental gallium is a soft, silvery blue metal at standard temperature and pressure; however in its liquid state it becomes silvery white.If too much force is applied, the gallium may fracture conchoidally.It is in group 13 of the periodic table, and thus has similarities to the other metals of the group, aluminium, indium ...
A continuous solvent extraction circuit was operated for over 150 hr, extracting over 90% of the germanium from 0.30 g/L Ge filtrates containing 40 to 60 g/L free acid. Over 90% of the loaded germanium was stripped from the organic phase with water at 75 °C. A section on germanium and gallium co-extraction is also presented.
Nov 30, 2016· Justia Patents Electrolysis: Processes, Compositions Used Therein, And Methods Of Preparing The Compositions Patents Electrolytic Synthesis (process, Composition, And Method Of Preparing Composition) Patents Preparing Single Metal Patents Gallium, Germanium, Indium, Vanadium, Or Molybdenum Produced Patents (Class 205/564)
THE DEVELOPMENT AND IMPLEMENTATION OF INDUSTRIAL HYDROMETALLURGICAL GALLIUM RECOVERY OF THE CLARKSVILLE REFINERY WASTE RESIDUE by ... Gallium, Germanium, Clarksville Residue, Clarksville Refinery, Ion Exchange, Electro-refining, ... Recovery of the gallium with a solvent extraction approach using, OPAP (Octyl Phenyl Acid Phosphate, C 14 H 23 O 4
Gallium is recovered from the acid liquor in the first still by treatment with aluminium to remove heavy metals and to reduce the iron to ferrous chloride, followed by extraction of the gallium ...
Germanium and gallium extraction tests To achieve a high and regular Ge and/or Ga extractable yield, regardless of the operational conditions of the IGCC plant, ... Germanium and Gallium Extraction from Gasification Fly Ash: Optimisation for the Up-Scaling of a Recovery Process ...
Table of ContentsMaterial and EquipmentGermanium ExtractionAvoiding Germanium PrecipitationTwo-Stage Counter-Current LeachingIncreasing 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 ...
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.
Recovery and separation of gallium(III) and germanium(IV) from zinc refinery residues : Part II: Solvent extraction. Author links open overlay panel Fupeng Liu a Zhihong Liu a Yuhu Li a Benjamin P. Wilson b Zhiyong Liu a Li Zeng a Mari Lundström b. Show more. https: ... when compared to the extraction of gallium and germanium in the sulfuric ...
The possibility of extracting extremely small amounts of germanium from metal gallium was first demonstrated by R Davis. Based on the Davis idea, we developed the technology of extracting single 71Ge atoms from many tons of metal gallium. Our first paper in which this method was applied to extracting single 71Ge atoms from 300 kg of metal
H. Jiang et al., "Kinetics of Gallium and Germanium Extraction from a Complex Ore by H 2 SO 4-Na 2 S 2 O 3 Leachants," Precious and Rare Metal Technologies, ed. A.E. Torma and I.H. Gundiler (New York: Elsevier, 1989), pp. 547–565. Google Scholar
The discovery of small amounts of gallium in zinc ores showed the possibility of its presence in a small quantity of zinc ore residues on hand at the Institute. Germanium had been previously extracted from the ore, and later, part of the zinc was recovered. During this work, the presence of gallium was shown by spectroscopic tests, and indium was at the same time shown to be absent.
In ...
Germanium is a chemical element with the symbol Ge and atomic number 32. It is a lustrous, hard-brittle, grayish-white metalloid in the carbon group, chemically similar to its group neighbours silicon and tin.Pure germanium is a semiconductor with an appearance similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature.
Gallium liquid clings to or wets glass and similar surfaces. Gallium also has the unusual property that (like water) it expands as it freezes. Four other elements expand when they freeze; silicon, bismuth, antimony and germanium. Uses of Gallium. Low melting gallium alloys are used in some medical thermometers as non-toxic substitutes for mercury.
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. These extractants were tested in separate, continuous, solvent- extraction circuits, yielding a gallium recovery of 94 pct and a germanium recovery of more than 90 pct.
The gallium and germanium in the zinc refinery residue mainly exist as dissociative or combined oxides that correlate with iron and silica. (2) The leaching of both gallium and germanium increase with increasing sulfuric acid concentration up to 156 g L − 1 with ratios of 90.83% and 65.06%, respectively. Further increases in the sulfuric acid ...
ofcrudegallium,containing5percentofindium,0.1percentoflead, and smaller amounts of silver,tin, and zinc, was carefullypurified. Inorderthatthe method ofpurification devised might be of general
A germanium--gallium generator producing EDTA-free /sup 68/Ga would permit the synthesis of a broad range of /sup 68/Ga radiopharmaceuticals and thus facilitate the widespread application of positron tomography. We have investigated a solvent-extraction generator system producing the weak complex of ...
Effect of H2S04 concentration on metal extraction from gallium-germanium ore ..... . Effect of leach temperature on metal extraction from gallium-germanium ore ..... . Effect of leach time at various acid concentrations on metal extraction from gallium-germanium ore .. .