4 results about "Nickel Protoxide" patented technology

The invention discloses a method for purifying nickel protoxide from electroplating sludge and application, and belongs to the technical field of nickel protoxide preparation. The method comprises the following steps: mixing a nickel-containing electroplating sludge raw material with ammonia water, carrying out ammonia complexing leaching, and separating to obtain a first filtrate containing a nickel ammine complex; sulfide is added into the first filtrate under the alkaline condition, copper impurities are removed through precipitation, and second filtrate is obtained; adding sulfide into the second filtrate under an acidic condition to precipitate and remove zinc impurities so as to obtain third filtrate; carrying out acid treatment on the third filtrate to decompose and convert the nickel-ammonia complex into a nickel sulfate solution; and adding alkali into the solution to precipitate to generate nickel hydroxide, and calcining to obtain nickel protoxide. According to the method, high-selectivity extraction of nickel in the electroplating sludge and efficient and deep removal of impurities such as copper and zinc are achieved through the ammonia leaching and specific-sequence step-by-step vulcanization impurity removal technology, the technological process is reasonable, and the obtained nickel protoxide is high in purity and can be directly used for preparing a high-performance soft magnetic ferrite material; the recycling and high-value utilization of the hazardous wastes are realized.

The invention relates to the technical field of preparation of inorganic functional materials, in particular to a production process of low-magnetism nickel protoxide, which comprises the following steps: pretreatment of a nickel chloride solution: pretreating nickel chloride hexahydrate to obtain the pretreated nickel chloride solution; the pretreated nickel chloride solution is pumped into a centrifugal atomizer of a spray pyrolysis device to form fine fog drops, the fog drops enter a pyrolysis furnace along with compressed air, three sections of temperature zones are arranged in the pyrolysis furnace, and the coarse nickel protoxide is prepared through precise temperature control and air quantity regulation; preparing a low-magnetism nickel oxide product; according to the method, the nickel chloride solution is used as a raw material, the magnetism is reduced through pretreatment complexing agent regulation, spray pyrolysis atomization parameter optimization and low-temperature ball milling dispersion, meanwhile, particles are uniformly dispersed, no obvious agglomeration phenomenon exists, and the low-magnetism small-granularity nickel protoxide product is prepared; the problems of high product magnetism, large particle size and serious agglomeration when nickel protoxide is prepared from a nickel chloride solution as a raw material in the prior art are solved.

The invention discloses a nanometer nickel protoxide preparation process based on coordination precursor pyrolysis, and belongs to the technical field of nanometer material preparation. According to the process, a gradient bond energy coordination system is constructed by compounding strong and weak coordination agents, oriented assembly is carried out by matching with an SDBS soft template, and asynchronous release of nickel ions and ordered growth of crystal nucleuses are realized through three-stage atmosphere coupling pyrolysis and water washing. The prepared nano nickel protoxide is uniform in particle size, low in agglomeration degree, few in carbon / sodium impurity residue, high in specific surface area, free of special equipment in process, simple and convenient to operate, controllable in cost and suitable for industrial batch production, and can be widely applied to the fields of energy storage, catalysis, sensing and the like.

This invention discloses a nickel-tantalum master alloy, comprising, by mass percentage: 40.0%–50.0% nickel, with the balance being tantalum and unavoidable impurities. The nickel-tantalum master alloy is prepared from nickel foil, nickel suboxide, tantalum pentoxide, aluminum powder, and calcium granules. The specific preparation method is as follows: nickel suboxide, tantalum pentoxide, and aluminum powder are mixed uniformly to obtain a mixture; calcium granules are spread evenly at the bottom of a crucible in a vacuum aluminothermic reaction furnace, and a layer of calcium oxide slurry is coated onto the inner wall of the crucible. After drying, the mixture is added to perform a vacuum aluminothermic / calcothermic reduction reaction to obtain a nickel-tantalum alloy liquid. After cooling, a primary nickel-tantalum alloy is obtained; tantalum pentoxide is wrapped in nickel foil to form multiple bales; the primary nickel-tantalum alloy is crushed, and the wrapped bales and crushed primary nickel-tantalum alloy are melted in a vacuum electron beam furnace; the melted alloy liquid is cooled to obtain the nickel-tantalum master alloy. The nickel-tantalum master alloy obtained by this invention has high uniformity and high purity.