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应用热力学、动力学理论分析了由羟胺与羧酸衍生物反应合成羟肟酸的各合成路线，采用最佳路线──酰氯羟胺化法合成了Ｃ５－９羟肟酸．用于浮选内蒙古乌海地区某铁矿的地表氧化矿中的细粒赤铁矿．小型粗选试验表明，用该法合成的Ｃ５－９羟肟酸对赤铁矿的选别能力优于新特２号、石油磺酸钠、水杨羟肟酸以及用酯化法生产的Ｃ５－９羟肟酸等捕收剂，而以油酸、亚麻酸、塔尔油、氧化石蜡皂为捕收剂则难以有效地从该矿石中浮选分离赤铁矿．用Ｃ５－９羟肟酸和煤油为捕收剂，含铁量为４３．７２％的原矿经一次粗选、四次精选，可获得品位为５６．３８％的铁精矿，铁的回收率为７１．４２％．
Based on the thermodynamics and kinetic theory, the synthesis routes of hydroxamic acid by the reaction of hydroxylamine and carboxylic acid derivatives were analyzed. The best route was acid chloride hydroxylation of C5-9 hydroxamic acid. Used for flotation of fine hematite in the surface oxide ore of an iron mine in Wuhai area, Inner. Small crude tests showed that the C5-hydroxamic acid synthesized by this method was superior to Xinte No. 2, sodium petroleum sulfonate, salicyclic hydroxamic acid, and C5-9 produced by esterification Hydroxamic acid and other collectors. However, oleic acid, linolenic acid, tallow oil and paraffin soap are difficult to effectively separate hematite from the ore. With C5-9 hydroxamic acid and kerosene as collector, the ore with 43.72% iron content is roughed once and four times, the iron concentrate with the grade of 56.38% can be obtained. The iron recovery The rate was 71.42%.