The invention discloses a method for removing the slag during the remelting of Ni-based superalloy, including: the master Ni-based superalloy is placed in a crucible located in a vacuum induction melting furnace; under the condition of maintaining a predetermined vacuum degree, the furnace cavity is heated to melt the master Ni-based superalloy, during the melting process, the metallic element Ca is thrown into the alloy melt, when the temperature in the furnace cavity rises to a predetermined degree, the master Ni-based superalloy is completely melted, at this time, the slag is formed on the surface of the alloy melt. When the master Ni-based superalloy is completely melted and enters the smelting stage, the metallic elements Ca, Ba, and Sr are put into the alloy melt in turn and the electromagnetic stirring is performed to rapidly remove the slag on the surface of the alloy melt.

The invention discloses a method for removing the slag during the remelting of Ni-based superalloy, including: the master Ni-based superalloy is placed in a crucible located in a vacuum induction melting furnace; under the condition of maintaining a predetermined vacuum degree, the furnace cavity is heated to melt the master Ni-based superalloy, during the melting process, the metallic element Ca is thrown into the alloy melt, when the temperature in the furnace cavity rises to a predetermined degree, the master Ni-based superalloy is completely melted, at this time, the slag is formed on the surface of the alloy melt. When the master Ni-based superalloy is completely melted and enters the smelting stage, the metallic elements Ca, Ba, and Sr are put into the alloy melt in turn and the electromagnetic stirring is performed to rapidly remove the slag on the surface of the alloy melt.

Provided herein is a method for preparing a nickel sulfate aqueous solution, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and the calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leached solution produced by the second leaching process; and (E) a solvent extraction process for refining nickel in the neutralized solution produced by the neutralization process.

Provided are a method for removing aluminum which can effectively remove aluminum, and a method for recovering metals. A method for removing aluminum includes a leaching step of bringing a raw material obtained from lithium ion battery waste, the raw material having battery powder containing at least aluminum and nickel and/or cobalt, into contact with an acidic leaching solution to leach the battery powder to obtain a leached solution, wherein a molar ratio of fluorine to aluminum (F/Al molar ratio) of the raw material is 1.3 or more, and wherein, in the leaching step, the acidic leaching solution contains calcium and fluorine, aluminum is precipitated with calcium and fluorine, and the resulting precipitate is contained in a leached residue.

Methods for extracting a target metal from a mixed metal input are described. The method includes milling the mixed metal input with ammonium bicarbonate to form a milled solid product, aging the milled solid product, and leaching the target metal from the aged solid product.

Systems and methods for sequestering carbon, evolving hydrogen gas, producing iron oxide as magnetite, and producing magnesium carbonate as magnesite through sequential carbonation and serpentinization/hydration reactions involving processed olivine- and/or pyroxene-rich ores, as typically found in mafic and ultramafic igneous rock. Precious or scarce metals, such nickel, cobalt, chromium, rare earth elements, and others, may be concentrated in the remaining ore to facilitate their recovery from any gangue material.

An active material contains at least one element M selected from the group consisting of nickel, cobalt, manganese, and lithium and an element X different from the element M. The element X comprises at least one member selected from metals of groups 2 and 15 in the second period, metals of groups 3, 11, and 13 to 16 in the fourth period, metals of groups 1 to 3, 7 to 13, and 15 to 17 in the fifth period, metals of groups 1 to 3 and 7 to 17 in the sixth period, and metals of groups 1 to 17 in the seventh period of the periodic table.

The present disclosure is directed to a process for recovering copper and cobalt from a copper and cobalt-containing sulfide ores and concentrates, particularly relatively low grade cobalt bearing sulfide ores and concentrates.

What is provided is a method for separating cobalt and nickel including: a crushing and sorting step of crushing and classifying the lithium ion secondary battery to obtain an electrode material containing at least cobalt, nickel, copper, and lithium; a leaching step of immersing the electrode material in a processing liquid containing sulfuric acid and hydrogen peroxide to obtain a leachate; a copper separation step of adding a hydrogen sulfide compound to the leachate with stirring and subsequently carrying out solid-liquid separation to obtain an eluate containing cobalt and nickel and a residue containing copper sulfide; and a cobalt/nickel separation step of adding an alkali metal hydroxide to the eluate to adjust a pH and subsequently, adding a hydrogen sulfide compound with stirring and carrying out solid-liquid separation to obtain a precipitate containing cobalt sulfide and nickel sulfide and a residual liquid containing lithium.

A process and method for producing a crystallized metal sulfate. The crystallized metal sulfate may be battery-grade. The method may comprise receiving a metal ion-containing stream and crystalizing a metal sulfate from the stream. The process may comprise receiving a stream from a metal processing plant, and crystalizing a metal sulfate from the stream. The process may be a metal electrowinning process comprising crystalizing a metal ion-containing stream to form a crystallized metal sulfate in a mother liquor. The process or method may comprise returning the mother liquor upstream or to the metal electrowinning process.