2 edition of Increasing the leaching rate of bulk superalloy scrap by melting with aluminum found in the catalog.
Increasing the leaching rate of bulk superalloy scrap by melting with aluminum
G. B. Atkinson
Bibliography: p. 10-11.
|Statement||by G.B. Atkinson.|
|Series||Bureau of Mines Report of investigations ;, 8833, Report of investigations (United States. Bureau of Mines) ;, 8833.|
|LC Classifications||TN23 .U43 no. 8833, TN758 .U43 no. 8833|
|The Physical Object|
|Pagination||11 p. :|
|Number of Pages||11|
|LC Control Number||83600298|
Superalloy grinding waste contains substantial quantities of nickel, cobalt, molybdenum, and chromium and for lack of an economical domestic recovery process is being marketed abroad. A process was developed and demonstrated on a laboratory scale for treating this complex waste product to recover the more valuable metals. 1, heavy melting scrap products are offered for sale by suppliers on , of which steel scrap accounts for 41%, industrial furnace accounts for 11%, and iron scrap accounts for 4%. A wide variety of heavy melting scrap options are available to you, such as melting, re-rolling. Some of those elements may need to be added as precisely as % variation in target quantity. Others may need to be excluded to miniscule limits expressed in ten thousandths of one percent. Alloying methods span the range of modern technology in melting, precision remelting, and powder metallurgy.
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Increasing the leaching rate of bulk superalloy scrap by melting with aluminum / by G.B. Atkinson. Description. Leaching rates for the HCI extraction of aluminum from calcined kaolinitic clay Leaching aluminum Increasing the leaching rate of bulk superalloy scrap by melting with aluminum book calcined kaolinitic clay with nitric acid.
Author Henry, Jack L. Published Aluminum extraction from anorthosite by. The Bureau of Mines investigated a method for increasing the leaching rate of bulk superalloy scrap to facilitate recycling and recovery of critical metals such as ni, CO, and cr.
Three superalloys were investigated, the cast-nickel-base superalloy in-the wrought-nickel-base superalloy rene, and the cast-cobalt- base superalloy mar-m Increasing the leaching rate of bulk superalloy scrap by melting with aluminum / By G.
(Gary B.) Atkinson. Abstract. Bibliography: p. Mode of access: Internet Topics: Leaching., Chromium-cobalt-nickel-molybdenum alloys, Scrap metals Author: G.
B.#N# (Gary B.) Atkinson. The Bureau of Mines investigated a method for increasing the leaching rate of bulk superalloy scrap to facilitate recycling and recovery of critical metals such as Ni, Co and Cr. Superalloys were melted w 30, 40 and 50% Al to form intermetallic by: 5.
melting and milling the waste superalloy scrap, the au- thors investigated leaching of nickel and cobalt from waste superalloys with sulfuric acid directly, the influ- ence factors on the leaching rates of nickel and cobalt ware mainly discussed based one the experimental re- sults.
Experimental. Experimental Materials. The superalloy scrap can also be recycled by sequential pyrometallurgical and hydrometallurgical processes.
The Bureau of Mines reported two techniques for recycling bulk superalloy scrap (Atkinson and Nicks, ). The first technique includes melting the scrap with aluminum (Al) to form intermetallic compounds that are brittle and easily crushed. Leaching. pieces of scrap IN with excess 6 N HCl at 95 °C for 2 h resulted in only % dissolution, whereas leaching 10 g of minus mesh o Al pct IN with excess 6N HCl at 95°C.
Leaching of the superalloy scrap samples were performed with and without sonication to investigate if an increased rhenium leaching rate and recovery can be gained by application of external ultrasonic waves.
The recovery of rhenium has been monitored until no further significant increase. Powder bed-based additive manufacturing (AM) processes are characterized by very high-temperature gradients and solidification rates. These conditions lead to microstructures orders of magnitude smaller than in conventional casting processes.
Especially in the field of high performance alloys, like nickel-base superalloys, this opens new opportunities for homogenization and alloy. aluminum and magnesium foams,[1–6] because the low melt-ing points of these metals allows the use of inexpensive salts with high water solubility, such as NaCl.
There is interest in using the replication casting method for metals with higher melting temperature with. SUPERALLOY SCRAP-GENERATION AND RECYCLING' L. Curwick2, W. Petersen3, and J. deBarbadillo4 Into Research & Development Center, Inc. Sterling Forest, Suffern, NY The domestic availability of chromium and other stra- tegic elements from superalloy and high temperature alloy scrap was assessed.
melting rate and energy distribution in relation to the melting behaviour of different scrap types and properties, and to make improvements of the process based on the model results.
This work was started from the experimental study (Zhou et al., ) and the numerical modelling (Zhou et al., ) of aluminium particle melting in molten melts. The production of superalloys that are used in the present time is a story of the invention of advanced melting technology.
Either the final product is forged or cast, the basis of superalloy’s ability is to produce the characteristics based on the suitable option and adaption of melting techniques. Leaching rates of bulk superalloy scrap are slow unless the materials already have a small particle size, such as the materials used in the studies mentioned above.
Studies conducted by Atkinson () and by Laverty (7) addressed the problem of reducing the particle size of bulk scrap to a size that would allow rapid leaching rates.
These. The scrap was easily comminuted under μm by a pyro-metallurgical pretreatment at °C, viz. the formation of Al3Ni intermetallic compound with aluminum. At the first leaching step at Increasing the Leaching Rate of Bulk Superalloy Scrap by Melting with Aluminum Author: Gary B. Atkinson Publish On: Published and analyzed composition of superalloys, percent IN Rene H.
Haung and J. Bernal, “Kinetic Study on Direct Leaching of ZnS in Sulfuric Acid Using Ferrous Sulfate as the Catalyst” in Electrochemistry in Mineral and Metal Processing, edited by P. Richardson et al., Electrochemical Society,pp.
– Google Scholar. The results illustrate that the rotational speed had a positive effect on the leaching rate of Tb; it ranged from % to % when the rotational speed increased from rpm to rpm, then showed a slight improvement (%) with the increase of rotational speed from rpm to rpm.
Most of the Tb was leached out from a practically. scrap materials for vacuum melting. In most VIM furnaces there is a vacuum lock bulk charger located directly over the crucible (Fig. Charge material may be added to the heat through the bulk charger while melting is in process in the crucible.
The material to be added is placed in bottom-opening buckets, placed in the bulk charger, and the. The melt rate was maintained at 7–9 kg/min to form the molten pool and was steadily and gradually lowered at a constant rate of 4–5 kg/min during the steady melting stage. Towards the end of the process, the voltage and current were adjusted to gradually reduce the melt rate.
induction melting from pure elements. A portion of this ternary base alloy was used to produce an 8 g button with a nominal composition of CoAlWRu at.% byarc-melting it together with a high-purity Ru powder, enclosed in high-purity Al foil, thereby preventing a loss of Ru during arc-melting.
Influence of Bulk Convection on Freckle Formation in Castings V. Sahai, R. Overfelt, and P. Banerjee Space Power Institute, Leach Center, Auburn University, Auburn, Alabama ABSTRACT In recent years, there has been an increased usage of single crystal superalloys in high.
Directionally solidified superalloy components having a bulk sulfur concentration of less than 1 part per million by weight are provided by vacuum melting a charge to form a superalloy melt, desulfurizing the melt by contact with a calcium-bearing desulfurizing agent for a time to reduce sulfur concentration of the melt to less than 1 ppm by weight, casting the melt directly or following.
A superalloy, or high-performance alloy, is an alloy with the ability to operate at a high fraction of its melting point. Several key characteristics of a superalloy are excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation.
The crystal structure is typically face-centered cubic (FCC) austenitic. This increase in demand and the shortage of supply make these Energy-Critical Elements (ECE’s) some of the most sought after industrial metals.
With the importance of these alloying elements, here are five essential tips to give you that competitive advantage when it. Flotation-nitric acid leach procedure for Increasing uranium recovery from a refractory ore Price: $ Iron extraction from simulated aluminum nitrate leach liquor Price: $ Increasing the leaching rate of bulk superalloy scrap by melting with aluminum Price: $ To receive SteelBenchmarker graphic and tabular price history, register as a "provider" at Prices are: USA -- FOB mill; Western Europe and China -- Ex-works; and World Export Market -- FOB port of export.
were produced for each scrap type in order to ascertain the consistency of the material. A summary of the chemical analysis results of these 5 melts is shown in Table I. Figure 1: The processing flow in recycling titanium scrap for re-melting . The chemical compositions of the five ingots from the different scrap types had consistent.
A Review on Superalloys and IN Nickel-Based INCONEL Superalloy Enes Akca Department of Mechanical Engineering, Faculty of Engineering and temperatures in excess of 80% of their incipient melting temperatures, a fraction that is higher than for any other with chromium and/or aluminum .
A large number of investigations on the melting of small particles of low melting point elements such as lead, indium, tin and bismuth have been reported in the literature. (lez5) The onset of melting of these particles is found to take place significantly below the bulk melting point.
A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. Superalloys typically have an austenitic face-centered cubic crystal structure. A superalloy's base alloying element is usually nickel, cobalt, or nickel-iron.
Melting Solutions Limited can offer complete secondary scrap melting plants for efficient melting of all types of aluminum scrap in a wide range of capacities.
A typical melting plant will consist of: • Basic layout and design of the foundry building with consideration of scrap reception, preparation and storage. “The melting of Ti-6Al-4V (a workhorse aerospace alloy) in an electron beam furnace is a challenge,” the paper states.
“It has been shown that it’s absolutely necessary to obtain a stable process with a constant melting rate. The scrap should always be free from contamination.”.
aluminum, and the environment experienced. The melting temperatures of the pure ele-ments are as follows: nickel, F ( C); cobalt, F ( C); and iron, F ( C).
Incipient (lowest) melting temperatures and melting ranges of superal-loys are functions of composition and prior processing. Generally, incipient melting tem.
What makes this book unique is a specific focus on aluminum recovery, rather than just recycling in general. It also offers an integrated discussion of scrap recovery and re-melting operations and includes economic as well as technical elements of recycling.
Increasing the leaching rate of bulk superalloy scrap by melting with aluminum. Report of investigations/ Technical Report Atkinson, G B. The Bureau of Mines investigated a method for increasing the leaching rate of bulk superalloy scrap to facilitate recycling and recovery of critical metals such as Ni, Co, and Cr.
Three superalloys were. To recover chromium from scrap such as superalloy scrap, the feedstock is melted, subjected to controlled oxidation to oxidize and slag off reactive metals, then subjected to sulfidation and slow cooling to produce a coarse-grained solid wherein the bulk of the chromium is present in a phase consisting predominantly of a chromium sulfide.
Platinum group, six metals, in order of increasing atomic weight, ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt). The elements all possess a silvery white colour—except osmium, which is bluish white.
The chemical behaviour of these metals is paradoxical. leaching of slag from steel recycling: radionuclides and stable elements. data report, jan,revised sept.9, Superalloy Manufacturing Solutions Corporation leads with over 40 years of manufacturing experience in the aerospace, space, industrial and gas markets.
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