China Nonferrous Metallurgy

The fire assay is a classic analysis method in analytical chemistry. For the silver loss during the smelting and ash blowing process, the standard analysis method uses the second test or the third test to make corrections. Although the calibration results are very good, there are problems such as long analysis process, high operation cost, and increase of human operation error. In this paper, through the classification experiment of copper concentrate, gold concentrate, blister copper, copper anode slime and other materials in copper smelting, a large number of experimental data are statistically analyzed, and the primary and secondary testing methods are used to calculate the silver correction coefficient of each material, and get the following results. When the silver content is less than 200g/t, the correction coefficient is 1.03; when the silver content is in the range of 200~500g/t, the correction coefficient is 1.025; when the silver content is in the range of 500~1000g/t, the correction coefficient is 1.02; when the silver content is greater than 1000g/t, the correction coefficient is 1.01. The control experiment and the significance test prove that the result of this method is accurate and reliable. Compared with the traditional fire assay method, this method solves the problems of time-consuming and errors caused by the second test or third test, and achieves the effects of energy saving, consumption reduction and time saving.