抑制剂种类对油酸钠体系中焙烧稀土精矿可浮性的影响

从稀土精矿中提取稀土存在工艺复杂、对设备腐蚀严重、排放三废较多等问题.为了绿色而高效地利用稀土资源,将稀土精矿加氢氧化钙进行焙烧,考察油酸钠浮选体系中抑制剂种类对焙烧后稀土精矿(以REO单矿物表示)可浮性的影响.分别以焦磷酸钠、六偏磷酸钠、磷酸三钠、硅酸钠为无机抑制剂,以柠檬酸、乳酸、酒石酸为有机小分子抑制剂,以玉米淀粉、羧甲基纤维素钠、叔氨基阳离子醚化淀粉、羧甲基淀粉钠为有机高分子抑制剂,考察不同种类抑制剂对REO单矿物浮选行为的影响.结果表明:仅柠檬酸和焦磷酸钠对REO有明显的抑制作用,磷酸三钠和六偏磷酸钠对REO有微弱的抑制作用;焦磷酸钠在整个pH范围内对REO都有很强的抑制作用;柠檬酸对REO的抑制作用受pH值的影响,pH<8时抑制作用较强,REO基本上不浮,8

Effect of Types of Depressants on Floatability of Roasted Rare Earth Concentrate in NaOl System

There are problems of complex technology,serious equipment corrosion,much discharge of three wastes in ex-tracting rare earth from rare earth concentrate. To green and efficiently use rare earth resources,by roasting rare earth concen-trate after adding calcium hydroxide,and influence of inhibitor type on floatability of roasted rare earth concentrate ( presented by REO single ore) in sodium oleate flotation system were studied. The effect of different kinds of depressants on REO flotation behavior were investigated by using sodium pyrophosphate,calgon,sodium phosphate and sodium silicate as inorganic depress-ants,citric acid,lactic acid and tartaric acid as organic small molecule depressants,corn starch,carboxymethylcellulose sodi-um,cationic starch and sodium carboxymethyl starch as organic polymer depressants. The results show that citric acid and sodi-um pyrophosphate have obvious depression on REO flotation among three types of depressants,calgon and sodium phosphate have weak depression. Sodium pyrophosphate has strong depression at all research pH range,but the depression of citric acid was affected by pH. When pH<8,citric acid has strong depression,but it has weak depression on REO at 8