MA Zhi-jun1, HOU Jia-yi1*, ZHOU Nan2, GAO Ye2, HU Zhi-gang2

(1. College of Mining, Liaoning Technical University, Fuxin 123000, China；

2. Liaoning Institute of Geology and Mineral Resources Co. Ltd, Shenyang 110032, China)

Abstract: Taking fluorite ores from a fluorite mine in Liaoning Province as the research object, the flotation effects of two kinds of plant oleic acid on Fluorite were compared by using pure mineral and actual mineral flotation test, contact angle test and infrared spectrum analysis. The results of pure mineral test show that the collectability and selectivity of the plant oleic acid b to fluorite are better than those of the plant oleic acid. The contact angle test results show that the contact angle of the plant oleic acid a and b was changed from the hydrophilic angle to the hydrophobic angle after they were interacted with pure fluorite mineral.When the dosage of plant oleic acid b is 50mg/L, its contact angle has the maximum value of 112.7° and its floatability of fluorite is the best at the time. The results of infrared spectroscopy showed that the plant oleic acid b can have strong chemisorption on the surface of fluorite. Finally, the plantoleic acid b is selected for the actual mineral flotation test. It is proposed when the coarse grinding fineness is -0.074mm, such sized particle content is accounted for 71.60%. The rough processing inhibitor is sodium silicate, and the selective inhibitor is sodium hexametaphosphate. When the next regrinding fineness is -0.043mm, such sized particle content is accounted for 56.70%. Then we have carried out the process flow of one rough processing, one sweeping, six selective processing, and the medium sized particles of ore were taken back in sequence to redo the flotation process. Finally, fluorite concentrate with CaF2 grade of 97.89% has been obtained at the recovery rate of 79.61%.

Keywords: flotation; plant oleic acid; fluorite; calcite; quartz

ACTA MINERALOGICA SINICA Vol. 43, No. 5, 2023, Page 613