一种高分子絮凝剂对细粒胶磷矿浮选的影响

Effect of high-polymer flocculant on flotation of fine-grained collophane

我国磷矿资源以钙硅质难选沉积磷块岩矿石为主,含磷矿物与杂质矿物紧密共生,胶磷矿以"胶态"非晶质集合体存在,单体难以解离,磨矿细度高,产生的细粒表面积大,表面能高,致使药剂消耗量大,选择性差,严重影响磷精矿质量.以晋宁高硅胶磷矿为研究对象,添加一种非离子型高分子絮凝剂F-08进行正浮选和反浮选试验.正浮选粗选中,磨矿细度为-0.038 mm 81.11%时,碳酸钠用量为4 kg/t,水玻璃3 kg/t,油酸钠1.125 kg/t时,添加30 g/t F-08,磷精矿五氧化二磷品位从23.99%提高到24.54%,回收率从80.80%提高到85.30%;反浮选粗选中,六偏磷酸钠用量为2 kg/t,十二胺1 kg/t时,添加40 g/t F-08,磷精矿五氧化二磷品位从21.50%提高到22.95%,回收率从65.32%提高到70.48%.通过zeta电位测定、沉降实验及激光粒度分析测定,F-08的添加可促进捕收剂吸附,沉降速度增大,同时可增大硅酸盐矿物平均粒径.

Most of the phosphate rock resources are calcium-siliceous refractory deposition minerals in China,in which the phosphate mineral and impurity mineral are closely associated and the collophane exists in colloidal amorphous aggregation. They need to be milled very fine to mineral liberation. The big surface area and high surface energy of the obtained fine particles would lead to the great consumption and poor selectivity of the reagent, and affect the quality of phosphate concentrate seriously. In this study, the direct and the reverse flotation of Jinning high-silica gel phosphate rock(Yunnan) with the addition of a kind of nonionic polymer flocculant F-08 were carried out. Results show that phosphate concentrate grade of P2O5% increases from 23.99% to 24.54% and the recovery rate increases from 80.80% to 85.30% in direct flotation after addition of 30 g/t of F-08 at sodium carbonate of 4 kg/t, water glass of 3 kg/t and sodium oleate of 1.125 kg/t. In reverse flotation, phosphate concentrate grade of P2O5% increases from 21.50% to 22.95% and the recovery rate increases from 65.32% to 70.48% after addition of 40 g/t of F-08 at sodium hexametaphosphate of 2 kg/t and twelve amine of 1 kg/t. Zeta potential, sedimentation experiment and laser particle size analysis illustrate that the addition of F-08 can promote collector adsorption, speed up subsidence and increase the average particle size of the silicate minerals.