Experimental research on beneficiation of a low-grade scheelite in Guangdong

A skarn-type Scheelite polymetallic ore from Guangdong is low grade and complex in composition.There are amout of calcium gangue minerals in the ore.In light of the properties of the ore,a beneficiation process of "preferential flotation of sulfide minerals-roughing in normal temperature-cleaner in high temperature" was applied to beneficiate the ore.In the beneficiation process,731 combined oleic acid were used as collector,sodium silicate and sodium sulfide wereused as depressant in high temperature cleaner.The test results shows:By using this beneficiation process,a tungsten concentrate,whose tungsten grade is 60.35% and recovery rate is 66.33%,can be obtain from the raw ores with the wolfram grade grade of 0.15%.Comparing to the former beneficiation process,the tungsten grade and the recovery of the tungsten tungsten concentrate increased by 7.25% and 7.23%respectively.