从低品位萤石重晶石共生矿中优先浮选萤石试验研究

Preferential Flotation of Fluorite from Low⁃Grade Associated Ore of Fluorite and Barite

某低品位萤石重晶石共生矿含萤石21.2%、重晶石41.7%,二者嵌连关系紧密、可浮性相近,浮选分离难度较大。针对矿石性质特点,采用优先浮选萤石工艺,经一粗七精浮选闭路流程试验可获得产率15.60%、CaF_(2)品位97.36%、回收率70.43%的高品质萤石精矿,精矿中BaSO_(4)含量仅0.77%。在浮选过程中通过利用无机抑制剂与有机抑制剂之间的协同作用,强化了对重晶石的抑制作用,显著提高了捕收剂对萤石的选择性,实现了萤石与重晶石的高效分离。

Fluorite and barite in a low-grade associated ore are intimately intergrown,with the content of 21.2%and 41.7%respectively.Thus,it is hard to separate them via flotation process as they possess similar floatability.In view of the characteristics of this ore,a closed-circuit preferential flotation process consisting of one stage of roughing and seven stages of cleaning was adopted in an experiment,producing a high-quality fluorite concentrate with a yield of 15.60%,CaF_(2) grade of 97.36%and recovery of 70.43%,while the BaSO_(4) content therein was reduced to only 0.77%.In flotation process,the synergistic effect between inorganic and organic depressants can strengthen the depression of barite and significantly improve the selectivity of fluorite collector,resulting in an efficient separation of fluorite and barite.