Application of fire assay enrichment in determination of gold,platinum and palladium in nickel ores by inductively coupled plasma atomic emission spectrometry
The main components of nickel ore are nickel,copper,iron and sulfur.Where in the content of sulfur is in range of 20％-37％,and such a relatively high content has great influence on the lead fire assay separation and enrichment results.In order to obtain the proper lead button,the appropriate ratio of fire assay ingredients was selected in experiments.Silver nitrate was used as protective agent to reduce the loss of gold,platinum and palladium during cupellation.The obtained composite particle was dissolved,and the contents of gold,platinum and palladium were determined by inductively coupled plasma atomic emis-sion spectrometry(ICP-AES).The contents of gold,platinum and palladium in nickel ore were determined according to the experimental method,and the relative standard deviations(RSD,n=11)of measurement results were 4.1％-10.6％,2.7％-6.5％and 1.9％-8.0％,respectively.The spiked recoveries of gold,platinum and palladium were 97％-100％,99％-103％,and 98％-103％,respectively.The proposed meth-od effectively solved the lead fire assay ingredient for nickel ore with various sulfur contents.The contents of gold,platinum and palladium could be directly determined after dissolving the obtained composite particle.
lead fire assayinductively coupled plasma atomic emission spectrometry(ICP-AES)nickel oreprecious metalgoldplatinumpalladium
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