Abstract: A fluorite-barite ore containing 52.57% BaSO4 and  32.77% CaF2 in Chongqing,of which the main objective minerals are barite and fluorite,the main gangue minerals are calcite,quartz and other minor impurities,is difficult to beneficiate.In order to recycle the barite and fluorite in the ore,dressing test was carried out. The results show that compared to the process of barite selective flotation and then fluorite flotation,the indexs of barite and fluorite bulk flotation-separation flotation principle process were better.Under the grinding fineness of -0.074 mm 75%,bulk flotation with sodium dodecyl sulfate as collector,acid sodium silicate,tannin and aluminum sulfate as composite inhibitors,barite flotation with sodium carbonate as regulator and NaF as inhibitor,fluorite flotation with tannin,aluminum sulfate,sodium lignosulphonate and acid sodium silicate as composite inhibitors,oleic acid as collector,barite concentrate with yield of 52.44%,BaSO₄ grade of 94.83% and recovery rate of 97.00%,fluorite concentrate with yield of 30.33%,CaF₂ grade of 90.06% and recovery rate of 90.06% were obtained via circuit process of one roughing-one scavenging bulk flotation,bulk concentrate one roughing-two cleaning-one scavenging barite selective flotation and one roughing-four cleaning-one scavenging barite flotation.The effective separation of fluorite and barite with similar flotability was realized,which haved certain reference value and guiding significance to exploit and utilize the similar ore.

Key words: Fluorite, Barite, Mixed flotation, Preferentially floatation, Sodium lauryl sulfate, Sodium lignosulfonate