关键词: 钼矿石　, 工艺矿物学　, 阶段磨选　, 浮选　, 硫化钠　, 再磨

Abstract: To achieve the efficient recovery of a low-grade,finely disseminated molybdenum ore from Inner Mongolia,this
study,based on systematic process mineralogy analysis,conducted research on a short-flow flotation process. Process mineralogy
study show that the ore contains Mo of 0. 15%,with 93. 33% of the molybdenum occurring in molybdenite. The gangue minerals
are mainly calcium silicates,containing easily slimed minerals like chlorite and epidote. Molybdenite is finely disseminated;even
after primary grinding to 70% passing 200 mesh,27. 07% of it remains as poor middlings. To overcome slime interference
and simplify the flowsheet,a stage grinding and flotation process was developed. Conditional tests determined the optimal primary
rougher flotation parameters:a grinding fineness of 70% passing 200 mesh,using a combined collector of kerosene (20
g/ t) and DJ-327 (15 g/ t),along with sodium sulfide (1 500 g/ t) as a modifier,yielding a rougher concentrate assaying
7. 49% Mo with an operational recovery of 84. 52%. For the rougher concentrate,a pre-desliming,regrinding and cleaning
process was adopted. The optimal regrinding fineness was 65% passing 325 mesh,and pre-desliming effectively removed fine
gangue. Closed-circuit tests finally produced excellent indicators:a molybdenum concentrate grade of 46. 53% with a recovery
of 85. 15%,representing a concentration ratio of 304,while the tailings grade was reduced to 0. 023%. This process effectively
addresses the separation challenges of this type of finely disseminated,refractory molybdenum ore with high calcium-magnesium
gangue.

Key words: molybdenum ore,process mineralogy,stage grinding and flotation,flotation,sodium sulfide,regrinding