Preparation method of fluxing agent coverage piece

Abstract

The invention relates to a preparation method of a fluxing agent coverage piece. According to technical scheme, material preparation is performed according to the mass ratio 1: (1-5) of a solid fluxing agent to an ash-free binding agent, and even mixing is performed to obtain a mixture; then, pure water is added to the mixture, the adding amount of the pure water is 10-50% of the weight of the mixture, and even mixing is performed to obtain a plastic material; the plastic material is transferred to a cylindrical mold to make a cylindrical green body through molding, then the cylindrical green body is sliced, and drying is performed to obtain the fluxing agent coverage piece. The solid fluxing agent is one of lithium carbonate, lithium tetraborate, lithium metaborate, sodium carbonate and boric acid, the purity of the solid fluxing agent is 99.9% or above, and the particle size is smaller than 0.5 mm. The ash-free binding agent is one of polyvinyl alcohol, polyethylene, polypropylene and polyacrylate. The ash content of the ash-free binding agent is smaller than 0.01% by weight. The preparation method has the advantages of being simple and convenient to operate, good in splash preventing effect, saving time and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of flux melting. In particular, it relates to a preparation method of a flux-covered sheet. Background technique [0002] At present, in the process of chemical analysis, the high temperature melting method is often used to decompose the sample. The specific operation steps are as follows: mix the flux and the sample in proportion, transfer them to a platinum or platinum crucible, and spread a layer of covering flux. The decomposition of the sample is essentially the chemical reaction between the flux and the sample at high temperature. During the chemical reaction, the reaction system often has volume expansion, contraction and gas discharge. Covering the flux can prevent the reactants, half-reactants and products from splashing caused by gas discharge and excessive local reaction during the reaction, so as to absorb or capture the splashes. During the melting process, since the particle size of the cov...

AI Technical Summary

Problems solved by technology

[0003] The problems of the above method are: 1. It takes a long time to evenly spread the covering flux, and it is difficult to control the amount of flux and the thickness of the covering layer; 2. Since there is no bonding force between the powder particles covering the flux, the covering layer has no bonding strength, and one of the local melting reactions A small volume change will cause the covering layer to fail; 3. The covering operation cannot be completed in batches, and the efficiency is low