Mineralogy and separation experiments were carried out for a low-grade linnaeite ore (0.052%), which belonged to limonite-hematite-pyrite type complex mineral. Under the grinding fineness of 80% -0.074 mm, linnaeite concentrate which contained cobalt grade of 0.51%, recovery rate of 80.99%, sulfur grade of 23.79%, recovery of 88.03% was obtained by closed-circuit processes of one roughing, two scaenging and one cleaning, which used sulfate acid (4500 g/t) and copper sulfate (300 g/t) as activator, so-dium silicate (1000 g/t) and CMC (30 g/t) as inhibitor, ethyl xanthate（100 g/t）and butyl xanthate (100 g/t) as collector, 2# oil (40 g/t) as forther in roughing, no agent in cleaing and first scavenging, used ethyl xan-thate（50 g/t）and butyl xanthate (50 g/t) as collector, 2# oil (20 g/t) as forther in second scavenging.
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机译：对属于褐铁矿-赤铁矿-黄铁矿型复合矿物的低品位菱镁矿（0.052％）进行了矿物学和分离实验。通过一次粗加工，两次粗化的闭路工艺，在钴粉度为80％-0.074mm的条件下，钴含量为0.51％，回收率为80.99％，硫含量为23.79％，回收率为88.03％的褐铁矿精矿。一次清洗，使用硫酸（4500 g / t）和硫酸铜（300 g / t）作为活化剂，硅酸钠（1000 g / t）和CMC（30 g / t）作为抑制剂，黄原酸乙酯（ 100 g / t）和收集剂为黄原酸丁酯（100 g / t），粗加工中使用2＃油（40 g / t），粗选和初馏中无助剂，废黄原酸乙酯（50 g / t）在第二次清除中，使用黄原酸丁酯（50 g / t）作为捕收剂，使用2＃油（20 g / t）作为捕收剂。
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