The test results in this paper show that the mixture of starch calcium nitrate can improving the selectivity of naphthenic acid (NPA) collecting fluorite and barite in flotation.

• 环烷酸对萤石和重晶石的捕收能力存在一定差异，淀粉?硝酸钙组合药剂能够进一步扩大这种差异。 浮选试验结果表明，组合药剂既能提高环烷酸对萤石的捕收能力，又能加强淀粉对重晶石的抑制能力。