Equipment and method for preparing nanometer metal powder

Abstract

The invention relates to equipment for preparing nanometer metal powder. The equipment comprises a feeding system, a preheating system, a pre-reduction system, a deep reduction system, a cooing system and a passivating device which are connected in sequence, wherein the preheating system is connected with a combustion chamber providing heat, and the combustion chamber is connected with the pre-reduction system and the deep reduction system; the pre-reduction system comprises a first fluidized bed reduction furnace for carrying out a pre-reduction reaction; the deep reduction system comprises a second fluidized bed reduction furnace for carrying out a deep reduction reaction; an internal cavity of the fluidizing section of the first fluidized bed reduction furnace and the second fluidized bed reduction furnace comprises a constant diameter section and a circular truncated cone-shaped diameter-reducing section, and the inner diameter of the lower part of the circular truncated cone-shaped diameter-reducing section is gradually reduced, and the taper angle of the circular truncated cone-shaped diameter-reducing section is smaller than or equal to 30 degrees. By using the equipment for preparing nanometer metal powder provided by the invention, the purity is 99% or above, and the grain diameter is uniform.

Description

technical field [0001] The invention belongs to the technical field of nano particle preparation, and relates to a device and a method for preparing nano metal powder. Background technique [0002] Due to the small particle size, nano metal powder has great surface effect, volume effect and quantum effect, and has unique physical and chemical properties in magnetism, light, electricity, heat, force, catalysis, etc., making nano metal and its composite materials in metallurgy, Machinery, chemical industry, electronics, national defense, nuclear technology, aerospace and other research fields have shown extremely important application value. The preparation technology of nano metal powder is one of the frontier topics of current research. [0003] At present, the preparation methods of nanometer metal powder can be divided into physical methods and chemical methods. Physical methods include mechanical pulverization, evaporation-condensation, sputtering, plasma, and high-press...

AI Technical Summary

Problems solved by technology

But when this process is used to prepare nano-nickel powder, nano-iron powder, because the agglomeration performance of nano-powder is stronger, bigger particle agglomerate (particle diameter is greater than 2mm) occurs at the bottom of the first stage reduction fluidized bed, this Particle agglomerates hinder the inward diffusion of hydrogen, making the product purity less than 90%

In addition, it also causes uneven particle size distribution and uneven color, which affects product quality.

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