Abstract: An integrated pressure leaching, heap leaching process for recovering copper from sulphidic feed containing iron, arsenic, and copper. Aqueous feed slurry of the sulphidic feed is pressure oxidized to form a liquid phase containing free sulphuric acid and aqueous copper sulphate, and to precipitate arsenic as solid iron arsenic compounds. Treated slurry is withdrawn from the pressure vessel and the liquid phase is separated from the solids. Copper is recovered from the separated liquid phase and generates a solution enriched in acid and depleted in copper. At least a portion of this solution is neutralized in a copper heap leach to produce a PLS containing copper and reduced in acid. At least a portion of the heap leach PLS is neutralized to produce a solution further reduced in acid, and solids containing copper precipitates, followed by a liquid solid separation.

Abstract: A process for the production of direct reduced iron (DRI), with or without carbon, using hydrogen, where the hydrogen is produced utilizing water generated internally from the process. The process is characterized by containing either one or two gas loops, one for affecting the reduction of the oxide and another for affecting the carburization of the DRI. The primary loop responsible for reduction recirculates used gas from the shaft furnace in a loop including a dry dedusting step, an oxygen removal step to generate the hydrogen, and a connection to the shaft furnace for reduction. In the absence of a second loop, this loop, in conjunction with natural gas addition, can be used to deposit carbon. A secondary carburizing loop installed downstream of the shaft furnace can more finely control carbon addition. This loop includes a reactor vessel, a dedusting step, and a gas separation unit.

Abstract: The invention relates to a method for multi-metal products recovery from pyrolytic waste integrated circuit boards. The method mainly comprises the steps of smelting and blending, atomization, acidolysis and filtration, noble metal recycling, copper extraction and back extraction, nickel extraction and back extraction. Compared with the prior art, the method has the advantages that smoke pollution and the smelting slag treatment in the process of preparing a black copper ingot through multi-metal collaborative smelting are reduced, and the problems of low anode efficiency of the black copper electrolysis process are solved. Meanwhile, the high-temperature high-oxygen atomized gas generated in the atomizing process provides a heat source and an oxygen source for subsequent acidolysis, so that the energy consumption is further reduced. The method has the advantages such as short process, remarkable energy conservation and emission reduction.

Abstract: Treating carbon steel tubing includes contacting the carbon steel tubing with a first treatment solution including a salt; corroding the carbon steel tubing with the salt to yield a corroded surface on the carbon steel tubing; contacting the corroded surface on the carbon steel tubing with a second treatment solution comprising sulfide ions; and forming an iron sulfide layer on the corroded surface of the carbon steel tubing by chemically bonding the sulfide ions in the second treatment solution with iron in the carbon steel tubing. In some cases, the first treatment solution also includes sulfide ions, and the iron sulfide layer is formed by contacting the carbon steel tubing with the first treatment solution.

Abstract: Provided herein is a high-strength stainless steel seamless pipe for oil country tubular goods. The high-strength stainless steel seamless pipe having a yield strength of 862 MPa or more contains, in mass %, C:0.05% or less, Si: 0.5% or less, Mn: 0.15 to 1.0%, P: 0.030% or less, S: 0.005% or less, Cr: 14.5 to 17.5%, Ni: 3.0 to 6.0%, Mo: 2.7 to 5.0%, Cu: 0.3 to 4.0%, W: 0.1 to 2.5%, V: 0.02 to 0.20%, Al: 0.10% or less, N: 0.15% or less, B: 0.0005 to 0.0100%, and the balance Fe and unavoidable impurities, and in which the composition satisfies specific formulas. The stainless steel pipe has more than 45% martensite phase, 10 to 45% ferrite phase, and 30% or less retained austenite phase. The ferrite grains have a maximum crystal grain size of 500 ?m or less.

Abstract: A system and method for the recovery and separation of rare earth elements (REEs) are provided. The system and method include the supported membrane solvent extraction of REEs and the separation of light and heavy REEs that have been recovered from scrap permanent magnets and other electronic waste. In supported membrane solvent extraction, an organic phase consisting of an extractant and an organic solvent is immobilized in the pores of hollow fibers. An aqueous feed solution and a strip solution flow along the shell side and lumen side of the hollow fibers, respectively. The extractant functions as a carrier to selectively transport certain rare earth metal ions from the feed side to the strip side. The rare earth metals are concurrently back extracted in the strip solution, allowing processing to proceed continuously without equilibrium limitations.

Abstract: A method of making a test coupon using a mold is provided. The mold defines a mold cavity that comprises a first-grip-portion cavity, a second-grip-portion cavity, an intermediate-portion cavity, interconnecting the first-grip-portion cavity and the second-grip-portion cavity, and runner cavities, directly interconnecting the first-grip-portion cavity and the second-grip-portion cavity and not directly connected to the intermediate-portion cavity. The method comprises injecting feedstock material, comprising a metal powder, into the mold cavity to form a monolithic precursor test coupon in the mold cavity, wherein the monolithic precursor test coupon comprises a first grip portion, a second grip portion, an intermediate portion, and runners. The method also comprises removing the runners from the monolithic precursor test coupon.

Abstract: Provided are: an aluminum alloy substrate for a magnetic disk, including an aluminum alloy including 0.4 to 3.0 mass % of Fe with the balance of Al and unavoidable impurities; a method for producing the aluminum alloy substrate for a magnetic disk; and a magnetic disk in which an electroless Ni—P plating treatment layer and a magnetic layer formed thereon are disposed on a surface of the aluminum alloy substrate for a magnetic disk.

Abstract: A method of suppressing the Samson phase, Al3Mg2, at grain boundaries in Aluminum, comprising providing aluminum in a container, adding boron to the container, providing an inert atmosphere, arc-melting the aluminum and the boron, and mixing the aluminum and the boron in the container to form an alloy mixture. An aluminum magnesium alloy with reduced Samson phase at grain boundaries made from the method of providing aluminum in a container, adding boron to the container, providing an inert atmosphere, arc-melting the aluminum and the boron, and mixing the aluminum and the boron in the container to form an alloy mixture.

Abstract: Provided is a ferritic stainless steel excellent in oxidation resistance and thermal fatigue resistance. The ferritic stainless steel contains, in mass %, C: 0.020% or less, Si: more than 0.1% and 3.0% or less, Mn: 0.05 to 2.0%, P: 0.050% or less, S: 0.010% or less, Al: 0.3 to 6.0%, N: 0.020% or less, Cr: 12 to 30%, Nb: more than 0.3% and 1.0% or less, Ti: 0.01 to 0.5%, Mo: 0.3 to 6.0%, Co: 0.01 to 3.0%, and Ni: 0.02 to 1.0%, the balance being Fe and unavoidable impurities. Moreover, Si+Al>1.0%, Al—Mn>0%, and Nb—Ti>0% hold.

Abstract: A nanocrystal production method includes a light irradiation step of applying light to a surface of a metal material immersed in water to form nanocrystals on the surface. In this nanocrystal production method, the metal material contains iron, the nanocrystal contains at least one of iron oxide and iron hydroxide, and in the spectrum of the light, a wavelength at which the intensity is maximum is not less than 360 nm and less than 620 nm.

Abstract: A piercer plug having good base-material deformation resistance is provided. A method of manufacturing a piercer plug (10) includes the steps of; preparing a plug body (1) including a tip portion (11) and a cylindrical portion (12) having a hole (121) usable to attach a bar and located rearward of the tip portion (11); forming a build-up layer (2) on the surface of the tip portion (11); and heating the plug body (1) such that the temperature of the tip portion (11) with the build-up layer (2) formed thereon is not lower than the austenite transformation temperature and the temperature of the cylindrical portion (12) is lower than the austenite transformation temperature.

Abstract: The present invention provides a method of forming a component (40) from an alloy sheet of material (30) having at least a Solvus temperature and a Solidus temperature of a precipitation hardening phase, the method comprising the steps of: heating the sheet (30) to above its Solvus temperature; initiating forming the heated sheet (30) between matched tools (32, 34) of a die press and forming by means of plastic deformation towards a final shape whilst allowing the average temperature of the sheet (30) to reduce at a first predetermined rate A; interrupting the forming of the sheet for a predetermined first interruption period P1 prior to achieving said final shape; and, during the interrupt holding the sheet of material with reduced or no deformation and allowing the average temperature of the sheet to reduce at a second predetermined rate B lower than or equal to the first predetermined rate in order to allow for a reduction in dislocations and completing the forming of the heated sheet into the final shape

Abstract: A particle composition includes metal fine particles composed of a metal element having a bulk melting point of greater than 420° C. with a primary particle diameter of primary particles of the metal fine particles being 1 nm to 500 nm, a part of or an entire surface of the metal fine particles being coated with a coating material; a low melting point metal powder composed of a metal or alloy having a bulk melting point of 420° C. or less; and an activating agent that decomposes and removes the coating material from the surface of the metal fine particles after the low melting point metal powder is melted, wherein a content of the metal fine particles containing the coating material is 0.5 mass % to 50 mass %, and a ratio ([inorganic compound/metal fine particles]×100 (mass %)) of the inorganic compound in the metal fine particles is 0.1 mass % to 50 mass %.

Abstract: A continuous annealing method for low coercive force cold-rolled electromagnetic pure iron plate and strip. Control parameters of each stages in a continuous annealing process are as follows: 750-850° C. at a heating stage; 750-850° C. at a soaking stage, the soaking time is 100-150 s; an outlet temperature of 575-675° C. at a slow-cooling stage, the cooling speed in slow-cooling stage is 2.5-10° C./s; an outlet temperature of 380-420° C. at a fast-cooling stage, the cooling speed of the fast-cooling stage is 15-25° C./s; and 270-310° C. at an overaging stage. The annealing medium is a non-oxidizing atmosphere composed of H2 and N2. After annealing, the cold-rolled electromagnetic pure iron plate and strip is leveled and pressed such that the leveling elongation rate of the plate and strip is controlled within the range of 0.2±0.1%.

Abstract: The present invention provides a process for producing a noble-metal powder, the process being capable of producing, at low cost, a noble-metal powder having a narrow particle-size distribution range, high purity and high crystallinity. The present invention relates to a process for producing a noble-metal powder and including a step in which an acidic aqueous solution of both one or more noble-metal compounds and a calcium compound is prepared, a step in which the acidic aqueous solution is added to a basic aqueous solution to yield one or more oxides or hydroxides of the noble metal(s) or a mixture of two or more thereof and yield a calcium hydroxide, a step in which the oxides or hydroxides of the noble metal(s) or the mixture is reduced with a reducing agent, and a step in which a solid matter including a reduced form of the noble metal(s) is separated and heat-treated.