105results about "Nickel compounds preparation" patented technology

An electroless nickel plating bath is provided that utilizes hypophosphite ions as a reducing agent and is substantially free of sulphate and sodium ions. Spent nickel in the plating bath is removed using an ion exchange resin and the remaining effluent solution is usable for manufacturing fertilizer compositions. The nickel is processed for inclusion back into the plating bath. Thus, the process of the invention allows for the indefinite use of the solutions without discharging hazardous waste.

There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with HCl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. Several other metals can be extracted from the leachate (Fe, Ni, Co, Mg, rare earth elements, rare metals, etc.). Various other components can be extracted from solid such as TiO2, SiO2 etc.

The invention provides an active material for a nonaqueous electrolyte secondary battery, a method for production of the active material and the nonaqueous electrolyte secondary battery using the active material, the active material excellent high-rate discharge characteristics. The active material for a nonaqueous electrolyte secondary battery includes a lithium-transition metal composite oxide which has an alpha-NaFeO2 -type crystal structure and of which the average composition is represented by the composition formula of Li1+[alpha]Me1-[alpha]O2 (Me is a transition metal containing Co, Ni and Mn; and alpha > 0), wherein the lithium-transition metal composite oxide is a particle having a core and a coated part, the cobalt concentration of the coated part is higher than the cobalt concentration of the core, the manganese concentration of the coated part is lower than the manganese concentration of the core, and the ratio of cobalt present in the coated part is 3 to 10% in terms of a molar ratio based on the amount of the transition metal present in the core. In addition, the method for production of the active material of the nonaqueous electrolyte secondary battery is characterized by enabling cobalt-containing compounds, cobalt-nickel-containing compounds and cobalt-nickel-manganese-containing compounds with more cobalt than manganese in a molar ratio to coat co-precipitated precursor core particles of transition metal compounds containing cobalt, nickel and manganese and being with more manganese than cobalt in the molar ratio, mixing the co-precipitated precursor core particles and lithium compounds, and then firing.