3 edition of Extraction of Molybdenum and Rhenium From Concentrates by Electrooxidation. found in the catalog.
Extraction of Molybdenum and Rhenium From Concentrates by Electrooxidation.
United States. Bureau of Mines.
|Series||Report of investigations (United States. Bureau of Mines) -- 7802|
|Contributions||Lindstrom, R., Scheiner, B.|
Concentrate was fed at a rate that varied between and lb/hr to determine the effect of process variables on molybdenum and rhenium extraction. The electrooxidation section of the pilot plant was operated on a hr basis, whereas the remainder of the plant was operated semi-continuously. The processing sequence required treatment of the solution with SO\u to reduce the chlorate ion and adjust the pH prior to solvent extraction of molybdenum and rhenium with a tertiary amine. Molybdenum and rhenium were stripped from the organic phase with an NH\uOH solution, and the strip solution was then passed through activated.
The Bureau of Mines has demonstrated an electrooxidation-solvent extraction-carbon adsorption technique for recovering molybdenum and rhenium from offgrade concentrates in a process research unit (pru) operating at a feed rate of to Lb of concentrate per hour. Extraction and recovery of molybdenum and rhenium from molybdenite concentrates by electrooxidation: process demonstration / By Bernard J. Scheiner, joint author. D.
"Following a successful solvent extraction (SX) pilot plant demonstration in , CYANEX® has been used commercially to recover molybdenum from concentrate leach liquor since March Consistent with the piloting results, the commercial plant has achieved expected molybdenum recovery, a significant reduction in base consumption, and a. O, a maximal molybdenum extraction of 93% was achieved in the pH range − at T = 35 °C In contrast, temperature and pH did not have a signiﬁcant eﬀect on rhenium partitioning, and optimal rhenium extraction was obtained by increasing the PEG and CuSO 4 concen-tration, yielding a ﬁnal ATPS composition of wt.% PEG.
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Additional Physical Format: Online version: Lindstrom, R.E. (Roald Edmund), Extraction of molybdenum and rhenium from concentrates by electrooxidation.
The flow sequence consists of dissolution of metal values by electrooxidation, liquid-solid separation by thickening, acidification and chlorate ion removal by sulfur dioxide treatment, solvent extraction to concentrate the molybdenum and rhenium, separation of molybdenum and rhenium by carbon adsorption, and metal recovery by crystallization.
Recovery and separation of molybdenum and rhenium from a process solution was accomplished by a technique developed by the Federal Bureau of Mines involving a combined solvent extraction and activated carbon adsorption procedure.
The processing sequence required treatment of the solution with SO2 to reduce the chlorate ion and adjust the pH prior to solvent extraction of molybdenum and rhenium. Table of ContentsElectrooxidation Theory & PrinciplesEquipment and Operating ProcedureBipolar Cell DevelopmentLarge-Scale Electrooxidation TestsMolybdenum and Rhenium RecoveryConclusions As part of the goal to maximize minerals and metals recovery from primary domestic resources, design factors associated with minimizing current leakage in bipolar cell.
Extraction of molybdenum and rhenium values from low grade Indian molybdenite concentrate was investigated by roasting the concentrate in the presence of slaked lime and soda ash, followed by.
The behavior of molybdenum, rhenium, and sulfur was investigated for examining the extraction conditions and efficiency.
The leach solution obtained by electro-oxidation was then subjected to a solvent extraction experiment, and rhenium present at several tens of mass ppm in the concentrate was enriched to more than 1, times, and recovered.
Molybdenum resources around the world are mainly associated with porphyry copper ores. Molybdenite (MoS2) is the main Mo mineral that has rhenium in its crystal lattice. This paper investigates the recovery of rhenium and molybdenum from a molybdenite concentrate using a hydrometallurgical treatment method.
The molybdenite concentrate is leached with nitric acid. The molybdenite concentrate is leached with nitric acid and subjected to solvent extraction to recover and separate rhenium and molybdenum from the leached liquor.
The effects of pH and the chemicals' concentration on extraction characteristics of Mo and Re are investigated to define the best condition for selective extraction of these metals. Molybdenum and rhenium may be co-extracted from acidic media by a mixture of trioctylamine (%) and Aliquat (%) in kerosene/5% iso-octanol.
During POX, the oxidation of molybdenum (Mo) is above 98%. More than 95% of the rhenium (Re) and 15% to 20% of the Mo are leached into solution. The sulfur in the concentrate is converted to H 2 SO 4, which results in high acidity of the solution.
SX was used to recover the Re and Mo from the solution. The technology of selective extraction of rhenium from alkaline solutions containing rhenium and molybdenum by solvent extraction using a mixture of tributyl phosphate and triotylamine as extractant has been investigated, complete separation of rhenium from alkaline solutions containing rhenium and molybdenum was possible after repeated.
The effect of concentration of NaCl on molybdenum extraction was studied using a liquid-to-solid ratio (molybdenite, 5 g), stirring speed rpm, operating potential V, anode ampere density A/m 2, pH = 9, room temperature, leaching time min.
Concentration of NaCl is changing from 2 mol/L to 6 mol/L; concentration of NaCl can also. Abstract With the purpose of extracting rhenium from molybdenum concentrate, electrolysis of slurry, prepared by mixing molybdenum sulfide concentrate and. Extraction of molybdenum and rhenium from concentrates by electrooxidation / By R.
(Roald Edmund) Lindstrom, Bernard J. Scheiner, Reno Metallurgy Research Center (U.S.). and United States. concentrates by electrooxidation”, Bureau of Mines RI Scheiner B.J., Lindstrom R.E., and Pool D.L., “Extraction and recovery of molybdenum and rhenium from molybdenite.
Molybdenum and rhenium extractions of 98 to 99 percent were achieved from several concentrates containing to percent molybdenum and ppm to 1, ppm rhenium.
Optimum results were obtained by maintaining ph values between and During electrolysis and allowing the final ph to rise to about Prototype commercial electrooxidation cell for the recovery of molybdenum and rhenium from molybdenite concentrates.
[Washington]: Dept. of the Interior, Bureau of Mines, (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Bernard J Scheiner; United.
For identifying the optimum conditions for the extraction and separation of molybdenum and rhenium from concentrate, influence of current density. Abstract. The effects of microwave roasting on separation of rhenium (Re) and molybdenum (Mo) from a molybdenite concentrate have been investigated based on evaluation of the heating characteristics of the concentrate in the microwave field.
Extractive Metallurgy of Molybdenum provides an up-to-date, comprehensive account of the extraction and process metallurgy fields of molybdenum. The book covers the history of metallurgy of molybdenum from its beginnings to the present day.
Topics discussed include molybdenum properties and applications, pyrometallurgy of molybdenum, hydrometallurgy of molybdenum 5/5(1). The methods proposed in chapters are on rhenium which are based on the complexation of lower valent rhenium with thiocyanate and nitroprusside using ascorbic acid as reductant, while the other one employs 2-aminonitrobenzothiazole as a complexing agent for rhenium in presence of stannous chloride.Laboratory and pilot plant experiments are in progress on low-grade molybdenum concentrates containing rhenium and copper.
Preliminary results indicate that molybdenum extractions in the 90 to 99 percent range and rhenium extractions of 95 to 99 percent can be obtained without appreciable oxidation of associated copper minerals.
Rhenium-bearing molybdenite concentrate is a typical mineral resource to recover molybdenum and rhenium, but has long been poorly utilized via oxidative roasting-leaching route.
In this work, a novel flowsheet consisting of chloride leaching, co-volatilization, selective condensation, and water leaching has been proposed and verified on the.