几种柠檬酸改性脂肪酸的浮选性能

Flotation performance of citric acid modified with citric acid

为了研究柠檬酸对脂肪酸的改性效果,以柠檬酸和不同种类的脂肪酸反应生成柠檬酸改性脂肪酸类捕收剂,并用于四川某中低品位胶磷矿的浮选试验,浮选试验在20℃下进行.结果表明,采用柠檬酸对脂肪酸进行改性,不同脂肪酸的改性效果不同.棉油脂肪酸表现出良好的捕收能力,但未表现出显著的改性效果.椰油脂肪酸、棕榈油脂肪酸和硬脂酸未表现出好的改性效果;纯油酸、低冻点棉籽油脂肪酸和米糠油脂肪酸的改性效果相似,产率和回收率均得到12%~15%的提高,改性效果较好;豆油脂肪酸经过柠檬酸改性后,精矿产率、回收率、选矿效率分别提高了25.96%、30.80%、4.84%,浮选指标得到较大提高,改性效果良好.柠檬酸对几种脂肪酸的改性效果为豆脂肪酸>纯油酸/低冻点棉籽油脂肪酸/米糠油脂肪酸>棉油脂肪酸>椰油脂肪酸>棕榈油脂肪酸/硬脂酸.

To study the modification effect of fatty acids modified with citric acid, we prepared collectors by reaction of citric acid with different fatty acids, and used them in the flotation test of low-and-middle grade collophanite in Sichuan at 20 ℃. The results show that the fatty acids have different modification effects after modification by citric acid. Cotton oil fatty acid does not show great modification effect, but shows excellent collecting ability. Coconut oil fatty acid, palm oil fatty acid and stearic acid did not exhibit positive modification effect. The modification effects of the pure oleic acid, low freezing point cottonseed oil acid and rice bran oil acid are good, and the yield and recovery increase 12%-15%. Soybean oil fatty acid shows impressive modification effect with great flotation index improvement, and the yield, recovery and beneficiation efficiency boost 25.96%, 30.80% and 4.84%, respectively. The strong-to-weak sequence of modification effects of different fatty acids is soybean oil fatty acid > pure oleic acid / low freezing point cottonseed oil fatty acid / rice bran oil fatty acid > cotton oil fatty acid > coconut oil fatty acid > palm oil fatty acid / stearic acid.