The flotation separation of chalcopyrite from pyrite using locust bean gum as depressant has been studied and the mechanism has been discussed. The results show that both chalcopyrite and pyrite are floatable in the tested pH range from 3 to 9,and the flotation separation of chalcopy-rite from pyrite can't be realized without the addition of depressant. Locust bean gum can adsorb on the surfaces of both chalcopyrite and pyrite and depress the flotation of these two minerals. But the depressing intensity and adsorption way of locust bean gum on chalcopyrite and pyrite are different. The adsorption way of locust bean gum on chalcopyrite surface is chemisorption,while pyrite is ab-sorbed by physical way.After the addition of locust bean gum,pyrite flotation recovery was low un-der all the test pH. Different from pyrite,the recovery of chalcopyrite is high under the condition of pH less than 9 and is low under strong base conditions. The flotation test on mixed mineral sindi-cates that the use of locust bean gum as depressant can achieve the flotation separation of chalcopy-rite from pyrite. A concentrate with Cu grade of 21.67% and recovery of 82.13% was achieved with the addition of 100 mg/L locust bean gum at pH 7. This study provides an excellent organic depressant for high efficiency separation of copper and sulfur.%采用浮选试验、Zeta电位和红外光谱测试,研究了刺槐豆胶在铜硫浮选分离中的作用,并分析了其作用机理.结果表明:当pH小于9时,黄铜矿及黄铁矿可浮性均较好,难以浮选分离.刺槐豆胶在黄铜矿及黄铁矿表面均发生了吸附,使二者的电位发生变化,并产生抑制作用,但刺槐豆胶对黄铜矿和黄铁矿的抑制强度及吸附方式都不同:刺槐豆胶在黄铜矿表面的吸附方式是化学吸附,而与黄铁矿是通过物理吸附方式作用.加入刺槐豆胶后,在pH为3~11条件下,黄铁矿的浮选回收率均较低;而当pH小于9时刺槐豆胶对黄铜矿抑制效果差,pH为11时对黄铜矿抑制效果极强.在pH为7时使用刺槐豆胶对铜品位为15.58%的混合矿进行浮选分离后,获得的铜精矿铜品位为21.67%、回收率为82.13%.该研究为铜硫高效分离提供了一种性能优良的有机抑制剂.
展开▼
