METHOD OF PREPARING SAMPLES OF POWDERED MECHANICAL MIXTURES OF SILICOCALCIUM AND GRANULAR METALLIC CALCIUM FOR DETERMINING OVERALL CONTENT OF CALCIUM IN MIXTURE Russian patent published in 2008 - IPC G01N1/00 

FIELD: analytical chemistry.

SUBSTANCE: method involves selection of samples and conversion of active compounds of calcium, contained in a wire, into calcium hydroxide. Samples of granular filler are put into weighed heat resistant cups. There are more than two cups. The cups are weighed and the net mass of the mixture is determined. The samples are carefully treated with small portions of water until turbulent reaction stops. The obtained mixture is dried in a drying furnace at 105-110°C until constant mass of the filler is attained. It is then cooled, ground and the mass of the obtained powdered filler is determined. The batch of the dried and weighed filler is ground in vibration grinding mills. When determining the mass fraction of calcium the compensation factor is considered. This factor shows the ratio of the mass of the filler with calcium hydroxide to the mass of the filler, containing metallic calcium.

EFFECT: easily accessible method of preparing flux cored wire for carrying out chemical analysis for determining the overall mass fraction of calcium using a complexometric method.