A method for pressing samples for xrfs analysis of boric acid substrates

Abstract

The invention relates to a method for pressing a sample sheet for XRFS analysis of a boric acid substrate. Its technical proposal is: put 2.5-3.5g of boric acid into the bottom of the charging chamber of the tablet press and spread it flat to obtain the substrate layer; 0 ‑(3~5mm) discs, that is, the backing film; where: d 0 Indicates the diameter of the charging cavity of the tablet press, mm; then spread the backing film on the substrate layer, spread 0.5-3g of sample powder evenly on the backing film; finally use a sample spoon to The powder of the sample is smoothed, the press head of the tablet press is installed, the pressure is applied, the pressure is maintained, and the mold is demoulded to obtain a sample for XRFS analysis of the boric acid substrate. The invention has the characteristics of high efficiency, no peeling layer, small sample powder consumption and high sheet forming rate.

Description

technical field [0001] The invention belongs to the technical field of XRFS analysis tabletting. Specifically relates to a method for pressing a sample sheet for XRFS analysis of a boric acid substrate. Background technique [0002] The X-ray Fluorescence Spectroscopy (XRFS) analysis method of powder compression is more and more widely used because it is fast, simple and does not change the chemical state and uniformity of the sample for the preparation of the sample for analysis. Tablet pressing methods are divided into plastic ring method, substrate hemming method and iron ring method according to different molds. The substrate wrapping method is more widely used because it can adapt to powders with poor self-binding force. Boric acid substrate wrapping tablet method (Li Xinjia. Influence of particle size effect on X-ray fluorescence spectroscopic analysis of sintered ore[J]. Metallurgical Analysis, 2006, 26(3): 92-93; Duan Jiahua, Ma Linze, Zhang Libin. Tablet sample p...

AI Technical Summary

Problems solved by technology

However, in the process of spreading and smoothing the sample powder, the fluffy boric acid of the substrate is easily turned up by the movement of the sample powder, making the sample work useless, and the sample powder needs to be replenished

Because the specific gravity of the sample powder is generally large, the fluidity is poor, the pressure on the working surface is inconsistent, and partial peeling is easy to occur when demolding after molding

Therefore, it is a time-consuming and labor-intensive task to spread out a sample powder layer with good thickness and uniform flatness. When the method of adding more sample powder is adopted, the sheeting rate will decrease.

[0004] The problems of the above method are: 1, low efficiency; 2, peeling layer is easy to occur; 3, the amount of sample powder is large; 4, the tableting rate is low