Process for preparing nano-grade AgCl powder by semisolid method

Abstract

The invention relates to a method of preparing a nano-scale silver chloride powder by semi-solid-state method. The method comprises the steps of adopting AgNO3 and KCI as reactants, and adopting sulfonating succinate, polyethylene glycols or fatty alcohol polyethenoxy ether as dispersants, to respectively formulate a sulfonating succinate dispersant solution, a polyethylene glycol dispersant solution or a fatty alcohol polyethenoxy ether dispersant solution; adding any dispersant solution into the reactant KCI before the reaction of the reactant to obtain a reaction material with good moisture dispersion; adding AgNO3 powder to KCI with good moisture dispersion; adding the dispersant solution additionally according to the moistening degree of AgNO3, so as to cause AgNO3 to reach the moistening degree; conducing the in-situ semi-solid-state reaction process under grinding; conducting the procedures of in-situ purification of a product, the drying of the product and the grinding and theshaping of the product to obtain the silver chloride powder. By the method, the yield can be reach up to 91 percent to 95 percent. The prepared silver chloride powders are nano-sclae silver chloride powders which have regular spherical shapes, clear boundary lines among particles, high dispersion state, uniform distribution of particles and average fineness being 50-70nm.

Description

technical field The invention relates to a method for preparing nanoscale silver chloride (AgCl) powder, in particular to a method for preparing nanoscale silver chloride powder by a semi-solid method. Background technique Solid-state Ag / AgCl electrodes can be used as sensing electrodes for electric fields in the ocean. Due to the strong attenuation effect of seawater on electric fields, the sensitivity of sensing electrodes is required to be high, and one of the important conditions for obtaining high-sensitivity Ag / AgCl electrodes It is to control the fineness of AgCl powder, one of the main components, which is one of the key technologies to ensure low noise of the electrode. The sufficient contact between Ag powder and AgCl powder, among which improving the fineness of AgCl powder is one of the key technologies to ensure high electrode sensitivity. Because the AgCl powder itself is easy to decompose when exposed to light, it is easy to agglomerate during the placement p...

AI Technical Summary

Problems solved by technology

However, the conventional solid-state reaction uses pure solid substances as reactants, and adopts a one-time feeding method, which easily leads to a large amount of products being generated in a very short period of time, and particles stick to each other and agglomerate.

There are few reports on the preparation of AgCl powder by semi-solid reaction

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