中文摘要：

通过单矿物浮选试验研究了羟肟酸体系和羟肟酸钠体系中微细粒赤铁矿的浮选行为，结果发现：常温和自然pH下，两种捕收剂对微细粒赤铁矿的捕收能力都较弱，回收率分别只能达到44．00％和52．42％；加温或调整pH对改善羟肟酸的浮选效果作用不大或反而起反作用，但可使羟肟酸钠对微细粒赤铁矿的回收率分别提高10．68和4．20个百分点，此外，若在加药完毕后继续搅拌调浆一段时间，也可较大幅度地提高羟肟酸钠对微细粒赤铁矿的回收率。在此基础上进一步考察了羟肟酸钠体系中六偏磷酸钠、硅酸钠、焦磷酸钠、淀粉、腐植酸钠这5种抑制剂对微细粒赤铁矿可浮性的影响，结果表明，5种抑制剂均可产生较强的抑制作用，其抑制能力的强弱排序为焦磷酸钠〉硅酸钠〉六偏磷酸钠〉淀粉〉腐植酸钠。

英文摘要：

Flotation behavior of uhrafine hematite in hydroximic acid and sodium hydroximic system was studied through monomineral flotation experiments. The results showed that under normal temperature and natural pH, two kinds of collectors have weakly collecting ability with the iron recovery rate of only 44.00% and 44.00% respectively; Heating or adjusting pH has a iess or negative effect in improving hydroximie acid flotation behavior, but can increase iron recovery of ultrafine hematite by 10.68% and 4.20% respectively with the sodium hydroximic system. In addition, the recovery will be increased signifi- cantly by continually stirring for a period after medication. Flotation behavior of ultrafine hematite affecting by five types of reg- ulators （sodium hexametaphosphate, sodium silicate, sodium pyrophosphate, starch, sodium humate） in sodium hydroxamate flotation system were further investigate. The results showed all five kinds of depressors generated high depression effect, and its depressing performance is behaved in the order of sodium pyrophosphate 〉 sodium silicate 〉 sodium hexametaphosphate 〉 starch 〉 sodium humic.