Surface treatment method for superfine metal nickel powder

Abstract

The invention discloses a surface treatment method for superfine metal nickel powder. The method comprises the following steps that a, submicron metal nickel powder is added into a reactor to be heated to form a liquid state, and then heating and evaporating are carried out to form nickel steam; b, the nickel steam formed in the step a rises into a condensation pipe, and meanwhile, a gas distributor in the condensation pipe is opened to be filled with nitrogen gas for cooling; c, the nickel powder particles formed in the step b enters a pulse cooling chamber from the condensation pipe, oxygenis fully contacted with the high-temperature nickel powder particles, the oxygen and the nickel powder particles are subjected to oxidation reaction to generate nickel oxide; and d, the nickel powderparticles formed in the step c enter a cooling chamber to be cooled to 80-120 DEG C, meanwhile, air exhausting is carried out on inletting air of the cooling chamber, and the nickel powder falls intoa collecting device. According to the method, an oxygen flow is controlled, meanwhile, nickel hydroxide is heated to separate the water, and the nickel hydroxide content of the nickel powder is reduced, powder is uniformly heated in the oxidation process, the oxygen content distribution is uniform, the content of nickel oxide is high.

Description

technical field [0001] The invention relates to the technical field of submicron metal powder preparation, in particular to a surface treatment method for superfine metal nickel powder. Background technique [0002] At present, in the MLCC industry, nickel metal is generally used as the internal electrode. For different products such as high, medium and low-end products, the content of oxygen in nickel powder has different requirements. The content of nickel oxide in nickel powder directly affects the matching between the manufacturing process and ceramics. and capacitor quality. [0003] In the submicron metal powder preparation industry, chemical vapor deposition (CVD) and physical vapor phase (PVD) methods are used to produce metal nickel powder, and the metal nickel powder produced by the two methods has problems such as nickel oxide content. In the physical vapor phase (PVD) production process, the system uses nitrogen as a carrier to prepare nickel powder in a low-oxy...

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Problems solved by technology

[0007] 1) Since the nickel powder is carried out under static conditions during the oxygenation process, the accumulation height of the nickel powder is different, the heating degree of the surface and the bottom of the nickel powder is different, and the contact area between the nickel powder and the oxidizing medium is different, resulting in a different degree of oxidation of the powder after oxygenation , nickel oxide content is not uniform

[0008] 2) Since the nickel powder is carried out under static conditions during the oxygenation process, the powder heating and oxygenation process is prone to powder agglomeration, sintering, conjoining, etc., and the powder dispersibility is poor

[0009] 3) Since the nickel powder is carried out under static conditions during the oxygenation process, the temperature is completed at 230-280°C. After the heating temperature is too high, the powder will be heated unevenly, the temperature will gather sharply, and the nickel powder will burn violently. Therefore, the nickel powder The oxidation temperature of the powder is limited, and the degree of oxygen content increase is limited

[0010] 4) Affected by the temperature limitation and the accumulation height of nickel powder, the decomposition and dehydration of nickel hydroxide is not complete, and the content of nickel hydroxide is high

[0011] 5) The oxygenation process is carried out under heating conditions, and high energy consumption equipment needs to be configured, which increases the production cost due to high energy consumption

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