Experimental Study on Optimization of Cassiterite Gravity Separation Based on Mineral Liberation Analyzer
The occurrence of black minerals in the gravity separation stage of cassiterite shakers in a concentrator has a serious impact on the grade of tin coarse concentrate.In order to ensure the quality of tin concentrate products,the process mineralogy study was carried out using the Mineral Liberation Analyser(MLA),and the composition,contents,particle size distribution,embedding characteristics and occurrence state of useful elements of the mineral were determined.MLA analysis results show that the main valuable component of black minerals in the gravity separation stage of cassiterite shaker in a concentrator plant is 1.12％,the main component of black minerals is ilvaite,accounting for 56.09％,followed by diopside and epidote,accounting for 10.54％and 6.35％,respectively.The magnetic minerals mainly included pyrrhotite,siderite,magnetite and limonite,in which pyrrhotite is in the dominate position,accounting for 3.70％.Based on the MLA analysis results,the beneficiation test process was adjusted and optimized,that is,the black minerals in the gravity separation stage of cassiterite shaker in a concentrator can be separated by a high-gradient magnetic separator at a magnetic induction intensity of 0.3 T and then re-separated by the shaker.After optimization,two cassiterite concentrate products with grades of 4.83％and 4.19％were finally obtained from the black minerals,with recoveries of 86.11％and 51.06％,respectively.
Tin oreIlvaiteMineral liberation analyzer(MLA)Magnetic separationGravity separation by shaker
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