Disussion on the reaction principle of fire assay and the influencing factors of slag
GUO Jiafan1, LAI Xinze1, WANG Lin*1, HU Jiazhen1, GAO Zhijun1, LAI Jiayi2
1. Rock and Mineral Testing Center of Henan Province, Key Laboratory of Precious Metals Analysis and Exploration Technology of Ministry of Natural Resources,Zhengzhou 450012, China; 2. No.2 Institute of Geological & Mineral Resources Survey of Henan, Zhengzhou 450012, China
Abstract：Fire assay has the advantages of good sampling representativeness, high enrichment factor and less elemental interference,so it is an important approach for separation and enrichment in the field of analysis and testing of precious metals at present. According to the composition of collector, fire assay could be divided into nickel sulfide fire assay, lead fire assay, bismuth fire assay and tin fire assay. There are usually some problems in geological tests such as shapeless buttons, too small buttons or high difficulty in button collection, which had directly influence on the fire assay results. To improve the analysis efficiency, the reaction mechanism of main fire assay ingredients (including borax, sodium carbonate, silica and covering agent) in the process of smelting as well as their influence on the slag were discussed. The experimental results showed that when the mass ratio of acid flux of borax to silica in slag was in the range of 1-2, it was easy to break the slag naturally in the cooling process. The separation of button from slag could be well realized, which was convenient for operation. Meanwhile, the influence of main components in materials (including calcium oxide, magnesium oxide, silica, iron and sulfur) on the slag status was studied. The scheme for adjusting slag properties and status was proposed for different materials to avoid the problem of shapeless buttons or dispersed beads. The formed buttons for fire assay were round and smooth, and the melting effect was good.
郭家凡, 来新泽, 王琳, 胡家祯, 高志军, 来佳仪. 火试金反应原理及熔渣影响因素探究[J]. 冶金分析, 2022, 42(12): 1-11.
GUO Jiafan, LAI Xinze, WANG Lin, HU Jiazhen, GAO Zhijun, LAI Jiayi. Disussion on the reaction principle of fire assay and the influencing factors of slag. , 2022, 42(12): 1-11.
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