Provided is a method for producing solutions, by which two solutions, namely a high-purity nickel sulfate solution and a mixed solution of nickel sulfate and cobalt sulfate are able to be obtained at the same time from a sulfuric acid solution containing nickel, cobalt and calcium. A method for producing solutions according to the present invention uses a sulfuric acid solution containing nickel, cobalt and calcium and performs a first step S1 for producing a mixed solution of nickel sulfate and cobalt sulfate from the sulfuric acid solution and a second step S2 for producing a solution of nickel sulfate from the sulfuric acid solution in parallel. In the first step, the sulfuric acid solution is subjected to solvent extraction by an extractant, thereby obtaining a first organic solvent after extraction In the second step, the sulfuric acid solution is subjected to solvent extraction by means of an extractant.

A method for extracting metals from the black mass of lithium-ion batteries, the black mass containing the anode and cathode materials of the batteries as well as some copper, and the cathode material comprising lithium and nickel. The method of extracting metals carried out by an arrangement that is suitable for use in the method.

A method for extracting metals from the black mass of lithium-ion batteries, the black mass containing the anode and cathode materials of the batteries as well as some copper, and the cathode material comprising lithium and nickel. The method of extracting metals carried out by an arrangement that is suitable for use in the method.

The present invention relates to a method for preparing nickel sulfate using low-nickel ferronickel is disclosed. The method comprises the following steps: (1) grinding ferronickel to obtain ferronickel powder, and then sintering the ferronickel powder with an oxidant to prepare ferronickel oxide powder; (2) adding sulfuric acid to the ferronickel oxide powder prepared in step (1), mixing, heating, and washing with water to prepare a sulfate salt water washing solution; (3) adding a base to the sulfate salt water washing solution prepared in step (2) to adjust the pH value, then adding a fluoride salt to form a precipitate, filtering to remove the precipitate, and drying the filtrate to obtain nickel sulfate. The method provided in the present invention can improve the efficiency of preparing nickel sulfate, reduce the loss of nickel, and prepare nickel sulfate with high purity, the content of Ni potentially reaching 19.73%-21.34%.

The present invention relates to a method for preparing nickel sulfate using low-nickel ferronickel is disclosed. The method comprises the following steps: (1) grinding ferronickel to obtain ferronickel powder, and then sintering the ferronickel powder with an oxidant to prepare ferronickel oxide powder; (2) adding sulfuric acid to the ferronickel oxide powder prepared in step (1), mixing, heating, and washing with water to prepare a sulfate salt water washing solution; (3) adding a base to the sulfate salt water washing solution prepared in step (2) to adjust the pH value, then adding a fluoride salt to form a precipitate, filtering to remove the precipitate, and drying the filtrate to obtain nickel sulfate. The method provided in the present invention can improve the efficiency of preparing nickel sulfate, reduce the loss of nickel, and prepare nickel sulfate with high purity, the content of Ni potentially reaching 19.73%-21.34%.

A method for extracting metals from the black mass of lithium-ion batteries, the black mass containing the anode and cathode materials of the batteries, and the cathode material including lithium and nickel. An arrangement is provided that is suitable for use in the method.

A method for extracting metals from the black mass of lithium-ion batteries, the black mass containing the anode and cathode materials of the batteries, and the cathode material including lithium and nickel. An arrangement is provided that is suitable for use in the method.

Disclosed are a nickel-iron wet treatment method and an application thereof. The treatment method comprises: in a high-pressure oxygen environment, mixing a crushed nickel-iron material, sulphuric acid and a corrosion aid, performing an acid leaching reaction, then performing solid-liquid separation on slurry subjected to acid leaching, adding an oxidant into the obtained filtrate, performing heating, removing the corrosion aid, adding a precipitating agent into the filtrate, controlling the pH value of the filtrate, and performing solid-liquid separation to obtain a ferric hydroxide precipitate and a nickel-containing filtrate; and performing extraction and back extraction on the nickel-containing filtrate to prepare battery-grade nickel sulphate. According to the present invention, the nickel-iron is subjected to oxidation acid dissolution in cooperation with the corrosion aid under the high-pressure oxygen and acidic conditions; the nickel-iron is extremely prone to oxidation in the high-pressure oxygen environment; and a strong oxidant is added into the filtrate subsequently, so that ferrous ions in the filtrate are completely converted into ferric ions, and the corrosion aid can be oxidized to generate pollution-free carbon dioxide and water, thereby avoiding the impact of the corrosion aid on the subsequent extraction process.

Disclosed are a nickel-iron wet treatment method and an application thereof. The treatment method comprises: in a high-pressure oxygen environment, mixing a crushed nickel-iron material, sulphuric acid and a corrosion aid, performing an acid leaching reaction, then performing solid-liquid separation on slurry subjected to acid leaching, adding an oxidant into the obtained filtrate, performing heating, removing the corrosion aid, adding a precipitating agent into the filtrate, controlling the pH value of the filtrate, and performing solid-liquid separation to obtain a ferric hydroxide precipitate and a nickel-containing filtrate; and performing extraction and back extraction on the nickel-containing filtrate to prepare battery-grade nickel sulphate. According to the present invention, the nickel-iron is subjected to oxidation acid dissolution in cooperation with the corrosion aid under the high-pressure oxygen and acidic conditions; the nickel-iron is extremely prone to oxidation in the high-pressure oxygen environment; and a strong oxidant is added into the filtrate subsequently, so that ferrous ions in the filtrate are completely converted into ferric ions, and the corrosion aid can be oxidized to generate pollution-free carbon dioxide and water, thereby avoiding the impact of the corrosion aid on the subsequent extraction process.

Provided is a method for separating copper from nickel and cobalt with which it is possible to selectively and efficiently separate copper, as well as nickel and cobalt, from an alloy including copper, nickel, and cobalt such as an alloy having high corrosion resistance that includes copper, nickel, and cobalt obtained by dry treatment of waste lithium ion cells. An alloy including copper, nickel, and cobalt is brought into contact with sulfuric acid in the joint presence of a sulfurizing agent, and a solid containing copper and a leachate containing nickel and cobalt are obtained.