Combined floatation-gravity-floatation flowsheet of a low grade wolframite slime

This paper studies the flowsheet of floatation-centrifuge preenrichment gravity separation-wolframite slime floatation based on the features of a low grade wolframite slime.The test results show that after the application of the flowsheet of twice roughing sulfur removal,roughing-cleaning centrifuge preenrichment by gravity separation,then roughing three times and cleaning twice scavenging separating wolframite by flotation,the tungsten concentrate with the grade of 33.80 % and the recovery of 61.08 % could be obtained.The tungsten minerals are well recoverd from wolframite slime with the recovery rate of 64.27 %.The flowsheet is cost-effective and environment-friendly for reduced beneficiation reagents dosages by adopting roughing enrichment measures of pre-desulfurization and centrifugal separator.