5results about "Nickel carbonates" patented technology

Disclosed herein is a process for removing water from a particulate material selected from (oxy)hydroxides and carbonates containing at least one of nickel, cobalt, and at least one metal other than nickel. The process includes the step of introducing at least one particulate material with a water content in the range of from 1 to 30% by weight, referring to said particulate material, into a rotary kiln with external heating elements and moving it through the rotary kiln together with a flow of a gas. The residual moisture of the resultant product is in the range of from 50 ppm to 1.5% by weight.

The present disclosure provides a production method of a precursor of a positive electrode active material capable of reducing generation of waste. The production method of the precursor of the positive electrode active material of the present disclosure includes: a step of bringing a raw material containing Ni and Co into contact with an aqueous phase containing ammonia and ammonium sulfate to leach Ni and Co into the aqueous phase; a step of removing ammonia from the aqueous phase while recovering the ammonia; a step of dissolving a manganese salt in the aqueous phase from which the ammonia has been removed; and a step of obtaining a carbonate containing Ni, Co, and Mn from the aqueous phase in which the manganese salt is dissolved by using ammonium bicarbonate for crystallization.

This invention discloses a low-water-consumption washing method for spherical nickel carbonate, belonging to the field of inorganic chemical material preparation technology. It solves the problems of high water consumption and long washing cycles in existing spherical nickel carbonate washing methods. The steps of this invention are as follows: Spherical nickel carbonate slurry is added to an aging tank, and the pH value of the slurry is adjusted to 9.0. After aging, the mixed slurry is transferred to a centrifuge to remove the mother liquor. Then, an alkaline solution is added to the centrifuge for pre-washing. Pure water is added, and the pre-washed slurry is repeatedly washed with pure water. After washing, the centrifuge is started for high-speed spin-drying. This washing operation is repeated 3-4 times, and finally, the spherical nickel carbonate is obtained after drying. This invention is convenient to operate and environmentally friendly. Through the process of pre-washing with dilute alkaline water + multi-stage washing with pure water, the production efficiency of spherical nickel carbonate is improved while significantly reducing water waste, making it suitable for large-scale application.

This invention belongs to the field of metal ion separation technology, specifically disclosing a method for separating mixed sulfates. In the mixed sulfate separation method provided by this invention, the mixed sulfate is Ni-containing... 2+ Co 2+ Cu 2+ Or Li + K + Na + The specific steps of this invention for obtaining mixed sulfate solutions include: adding a salt phase building agent to the mixed sulfate solution and adjusting the pH to 4-5.5 to obtain a salt phase; mixing the salt phase with an oil phase and a polymer phase to generate a three-phase coexistence system; allowing the phases to separate by standing, and then adjusting the pH to 6-7.5 and allowing it to stand again to obtain a Cu- or Na-rich polymer phase, a Co- or K-rich oil phase, and a Ni- or Li-rich salt phase. This invention utilizes a combination of "multiple driving forces synergistic enhancement, cation-directed selection, and segmented acidity control" to achieve efficient and simultaneous separation of multiple metal ions in sulfate solutions containing nickel, cobalt, copper, lithium, sodium, or potassium.

Provided in the present invention is a manganese-based carbonate precursor of a positive electrode material for a secondary battery. In the manganese-based carbonate precursor that has a specific structure and composition and contains a trace amount of uniformly distributed Na element, a content of Na is in a range of 0.5-3 mol%, which range can ensure that the structural integrity and consistency of carbonate crystals are not affected. In addition, the trace amount of Na element is uniformly distributed inside the manganese-based carbonate precursor provided in the present invention, and by means of simple mixing with a lithium source and sintering, a lithium-rich manganese-based material uniformly doped with Na element can be directly obtained without the need for introducing other Na source, whereby uneven doping of Na is effectively avoided, the doping effect is improved, and the electrical properties of the material are significantly improved, without a significant increase in the production cost at the same time. The precursor has a high primary particle crystallinity degree, and a good crystal structure. The lithium-rich manganese-based positive electrode material containing a trace amount of Na element provided in the present invention effectively improves the initial charging-discharging coulombic efficiency, the first-cycle discharge capacity, an average voltage, and the energy efficiency.