Preparing method for superfine silver powder

Abstract

The invention discloses a preparing method for superfine silver powder, and the preparing method is used in the technical field of silver powder wet process preparing equipment. A plurality of reaction raw materials are continuously added into a reactor with the curve flow path through a plurality of feeding ports at the same time. The reaction raw materials flow in the reactor along the curve flow path under the action of gravity, mixing and reacting are finished in the flow process, and products obtained through the reaction flow out of the reactor through a discharging port of the reactor.According to the disclosed preparing method for the superfine silver powder, the multiple reaction raw materials are added in the reactor with the multiple feeding ports and the curve flow path at thesame time, reaction raw material mixing and reacting are finished in the process that the reaction raw materials flow towards the discharging port from the feeding ports, stirring is not needed, mixing of the reaction raw materials is uniform, and the grain diameter of obtained silver powder is uniform.

Description

technical field [0001] The invention relates to the technical field of silver powder production equipment, in particular to a preparation method of ultrafine silver powder. Background technique [0002] Nano-silver powder is a simple substance of metallic silver whose particle size is nano-scale. Most of the nano-silver particle size is about 25 nanometers, which has a strong inhibitory and killing effect on dozens of pathogenic microorganisms such as Escherichia coli, Neisseria gonorrhoeae, and Chlamydia trachomatis, and will not produce drug resistance. Cotton socks made of nano-silver and combed cotton fibers have good antibacterial and deodorizing effects. [0003] In the process of wet reduction to produce silver powder, various reaction materials such as reducing agent, protective agent and acid-base are added. The wet reduction process of silver powder is generally carried out in the reaction kettle, and the reducing agent is added to the silver nitrate solution or ...

AI Technical Summary

Problems solved by technology

The wet reduction process of silver powder is generally carried out in the reaction kettle, and the reducing agent is added to the silver nitrate solution or the silver nitrate solution is added to the reducing agent solution. With the addition of a variety of solutions, the concentration of each material in the reactor is changing all the time, so the constant concentration of the solution cannot be guaranteed, and the consistency of the entire reduction process cannot be guaranteed, and during the reaction process, the silver powder particles and reaction products after the reaction Stir and mix together in the reactor, resulting in larger changes in silver powder particles and wider particle size range

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