Crushing methods of ferroalloys for fluorescence X-ray analysis

Studies on the fluorescence X-ray analysis of ferroalloys. I

Abstract

Methods for crushing of ferroalloys to be suitable for their fluorescence X-ray analysis were studied. Powders of Fe-Mn, Si-Mn, Fe-Cr, Si-Cr and Ca-Si crushed about 200 μ in size were ground in the roulette mill in CO₂ atmosphere to avoid oxidation. The results indicated that 30 sec. grinding was the most favorable, and that the optimum weight of sample is 3040 g. The flow rate of CO₂ should be 2000 ml per min. Under this condition, particle size of resulted powder were maintained at 48μ. Contents of Mn, Cr, Ca and Si were not so changed in most alloys, but they were decreased about 0.5% in some alloys. To minimize decrease of contents, another experiment of roulette mill grinding was done in vacuum, but the result was not greatly different from that in the CO₂. stream.