| The fire assay is studied with antimony as a collector for enrichment of iridium. The method is divided into trapping and ash blowing. When the sample is melted at 950℃ with a mixture containing flour antimony oxide, sodium carbonate, potassium carbonate, borax and flour, the iridium is trapped in a molten antimony. Then ash blowing the antimony alloy can be obtained an assay bead with iridium. The results showed, antimony assaying method combined with ICP-AES, can determine iridium in metallurgical enriched slag accurately. The standard recovery is 96.35%~98.93%, the relative standard deviation is less than 3%. The operation of the method is simple, rapid and accurate. |