A method for producing ferronickel and removing chromium from nickel laterite ore, including the following steps: (1) subjecting the nickel laterite ore to ore washing and separating to obtain an ore slurry and a mineral aggregate, adding an alkali liquor and a bromate and introducing oxygen to the ore slurry to allow oxidation leaching, and then conducting solid-liquid separation to obtain a solid and a chromium-containing filtrate; (2) subjecting the solid obtained in step (1) to washing and solid-liquid separation to obtain a solid phase and washing water, and mixing the solid phase with quicklime and a reducing agent to obtain a mixture; and (3) subjecting the mixture obtained in step (2) to roasting and smelting successively to obtain a finished ferronickel product. The method achieves enrichment of chromium, and produces ferronickel through smelting of the nickel laterite ore while removing the impurity chromium, protecting the safety of a furnace.

Disclosed in the present invention is a method for extracting valuable metal from low-matte nickel converter slag. The method comprises: mixing low-matte nickel converter slag and quicklime then calcinating, obtaining a calcinated material; grinding and magnetically separating the calcinated material, obtaining silicate and iron-rich slag; adding a strong alkali solution to the iron-rich slag to perform leaching processing, and performing solid-liquid separation, obtaining a filtrate and a residue; mixing the residue with an acid solution, performing oxygen pressure acid leaching, and performing solid-liquid separation, obtaining a leachate and iron oxide; introducing hydrogen sulfide gas into the leachate, adjusting the pH, and performing solid-liquid separation, obtaining a copper sulfide precipitate and a nickel-cobalt-containing filtrate. In the present invention, first, removing silicon dioxide is removed by means of calcination to prepare silicate, then iron oxide is prepared by means of acid leaching, and finally metal separation is performed on the leachate, causing various components of the converter slag to be effectively utilized. The process flow of the present invention is short and effectively utilizes each component of the low-matte nickel converter slag, waste is turned into valuable material, and the loss of valuable metal elements is reduced.

This invention relates to a method for processing nickel laterite ore, including the steps of obtaining a mined laterite ore from a mining operation 42; and feeding the ore through a bulk sorter 44 comprising a sensor arrangement and a diverting mechanism that separates the ore into a beneficiated stream of nickel laterite ore 28 wherein the grade of nickel is higher than the grade of the ore fed into the bulk sorter for further processing 52 by leaching or smelting; one or more low grade fractions of ore 50 with a lower nickel grade than the beneficiated stream; and a waste fraction 46. This configuration efficiently separates lower grade patches in the run of mine ore, to either a low-grade stockpile or waste, and efficiently blends the selected high-grade ore to meet the specifications of the subsequent processing.

Provided is a gravity separation device wherein occurrences of shelving, flashing, and the like inside the device can be suppressed, variations in the flow rate of underflow obtained by gravity separation can be minimized and underflow can be stably extracted. This gravity separation device, which separates overflow and underflow using differences in specific gravity from mixed material, is provided with a separation section that has a supply pipe for supplying a slurry of the mixed material at the top and separates that slurry into overflow and underflow, and a deposition section that is positioned below the separation section and wherein the underflow that has been separated by precipitation is deposited. An extraction pipe for extracting the underflow is connected to the deposition section, and a valve for extracting the underflow and a metering pump for quantitatively extracting the underflow are provided in the extraction pipe.

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 the methods of recycling electrochromic devices and also designing such devices while keeping recyclability in perspective. Recyclability includes recovering of certain materials for re-use within the same application or other applications. Using recycling reduces or eliminates waste stream quantities to be disposed of and/or reduces toxicity of these waste streams.

A hydrogen concentration-controllable safe reaction tank for leaching of waste battery powder, includes at bed provided with supporting frames and a driver; a rotary acid pumping barrel articulated with the supporting frames, the driver being configured to drive the rotary acid pumping barrel to rotate, and a delivery pipe mounted on the bed and passing through the rotary acid pumping barrel where a screw for pushing material is disposed in the delivery pipe; the delivery pipe includes a pouring section located in the rotary acid pumping barrel, the pouring section is provided with a pouring opening at an upper portion and acid leakage holes at a bottom, and at least one acid pumping plate is mounted on an inner wall of the rotary acid pumping barrel.

The present invention provides a method for directly preparing nickel sulfate from low nickel matte, a nickel sulfate and an application thereof, the method comprising the following steps: a) pre-treating a low nickel matte to obtain ferronickel powder; b) mixing the ferronickel powder with a sulfuric acid solution, stirring, dissolving, and then evaporating, to obtain a supersaturated sulfate solution; c) cooling the supersaturated sulfate solution to 5 C.-0 C., and performing suction filtration to obtain an insoluble solid; d) washing the insoluble solid with water, and removing impurities from the filtrate to obtain a nickel hydroxide precipitate; impurity removal comprising successively removing iron, and removing calcium and magnesium; e) washing the nickel hydroxide precipitate with water, acid-dissolving and evaporating to obtain nickel sulfate. The present invention increases the amount of nickel recovered, the purity of nickel sulfate being 18.10%-19.24% nickel, and the recovery rate being 94.8%-97.1%.

The present invention relates to a method for treating lithium ion battery scrap containing Li, Ni, Co, Mn, Al, Cu and Fe, the method comprising carrying out a calcination step, a crushing step and a sieving step in this order, and after the steps, the method comprising: a leaching step of leaching the lithium ion battery scrap by adding it to an acidic solution to leave at least a part of Cu as a solid; a Fe/Al removal step comprising allowing a leached solution obtained in the leaching step to pass through a Fe removal process for separating and removing Fe by addition of an oxidizing agent and an Al removal process for separating and removing a part of Al by neutralization in any order; an Al/Mn extraction step of extracting and removing a residue of Al and Mn from a separated solution obtained in the Fe/Al removal step by solvent extraction; a Co recovery step of extracting and back-extracting Co from a first extracted solution obtained in the Al/Mn extraction step by solvent extraction and recovering the Co by electrolytic winning; a Ni recovery step of extracting and back-extracting, by solvent extraction, a part of Ni from a second extracted solution obtained by the solvent extraction in the Co recovery step and recovering the Ni by electrolytic winning; a Li concentration step of extracting and back-extracting, by solvent extraction, a residue of Ni and Li from a third extracted solution obtained by the solvent extraction in the Ni recovery step and repeating the operations of the extracting and the back-extracting to concentrate Li; and a Li recovery step of carbonating Li in a Li concentrated solution obtained in the Li concentration step to recover the Li as lithium carbonate.

The present invention relates to a method for treating lithium ion battery scrap containing Li, Ni, Co, Mn, Al, Cu and Fe, the method comprising carrying out a calcination step, a crushing step and a sieving step in this order, and after the steps, the method comprising: a leaching step of leaching the lithium ion battery scrap by adding it to an acidic solution to leave at least a part of Cu as a solid; a Fe/Al removal step comprising allowing a leached solution obtained in the leaching step to pass through a Fe removal process for separating and removing Fe by addition of an oxidizing agent and an Al removal process for separating and removing a part of Al by neutralization in any order; an Al/Mn extraction step of extracting and removing a residue of Al and Mn from a separated solution obtained in the Fe/Al removal step by solvent extraction; a Co recovery step of extracting and back-extracting Co from a first extracted solution obtained in the Al/Mn extraction step by solvent extraction and recovering the Co by electrolytic winning; a Ni recovery step of extracting and back-extracting, by solvent extraction, a part of Ni from a second extracted solution obtained by the solvent extraction in the Co recovery step and recovering the Ni by electrolytic winning; a Li concentration step of extracting and back-extracting, by solvent extraction, a residue of Ni and Li from a third extracted solution obtained by the solvent extraction in the Ni recovery step and repeating the operations of the extracting and the back-extracting to concentrate Li; and a Li recovery step of carbonating Li in a Li concentrated solution obtained in the Li concentration step to recover the Li as lithium carbonate.