磁选-重选-浮选组合新工艺分选氟碳铈矿型稀土矿的试验研究

发布时间：2018-07-29 16:01

【摘要】：采用矿物自动分析仪(MLA)查明了四川牦牛坪稀土矿的矿物组成、嵌布粒度特征,对比分析了主要矿物的密度、莫氏硬度、比磁化系数和磁性的工艺特性差异,利用湿式高梯度强磁选-重选-浮选的组合工艺进行了选矿试验研究。结果表明:主要稀土矿物氟碳铈矿粒度多在1.28~0.04 mm范围内,具有顺磁性,而重晶石、萤石、正长石和石英呈现非磁性,此磁性差异是强磁选能预先富集的关键矿物学因素。通过实验确定最佳工艺条件和结果为:在-1.0 mm粒径,1.0 T背景场强下湿式强磁选粗选,强磁选精矿分级成3个粒级物料,-1.0~+0.4 mm物料进行粗砂摇床重选,-0.4+0.074和-0.074 mm物料分别进行细砂摇床重选,各重选中矿合并,在0.6 T背景场强下湿式强磁选精选,磁选精矿与重选精矿合并,获得REO品位65.49%,回收率67.80%的磁重稀土精矿;磁选精选中矿与摇床尾矿合并成REO 2.10%的稀土中矿,在磨矿细度-0.043 mm占70%,pH 8~9,水玻璃用量714 g·t~(-1)原矿,捕收剂GSY 1033 g·t~(-1)原矿下进行常温浮选,获得REO品位67.84%,回收率15.46%的浮选稀土精矿;两种稀土精矿REO平均品位65.93%,总回收率83.26%。
[Abstract]:The mineral composition and distribution granularity characteristics of Yangniuping rare earth ore in Sichuan province were determined by mineral automatic analyzer (MLA). The density, Morse hardness, specific magnetization coefficient and magnetic technological characteristics of the main minerals were compared and analyzed. The combined process of wet high gradient strong magnetic separation-gravity separation and flotation was used to study the ore dressing experiment. The results show that the granularity of the main rare earth minerals is in the range of 1.28 ~ 0.04 mm, which is paramagnetic, while barite, fluorite, orthoclase and quartz are nonmagnetic. This magnetic difference is the key mineralogical factor for preconcentration of strong magnetic separation energy. The optimum technological conditions and results are determined by experiments. The results are as follows: coarse separation of wet intensity magnetic separation under the background field of -1.0 mm particle size and 1.0 T, The concentrate of strong magnetic separation is classified into three grain-grade materials (-1.0 ~ 0.4mm) for coarse sand shaker gravity separation (-0.4 0.074) and -0.074 mm (-0.074 mm) for fine sand shaker gravity separation, each gravity separation concentrate is combined with each other, and wet strong magnetic separation is carried out under 0.6 T background field strength. By combining magnetic concentrate with gravity concentrate, REO grade of 65.49% and recovery of 67.80% were obtained, and the medium ore of magnetic separation combined with shaker tailings formed REO 2.10% of rare earth intermediate ore, and the grinding fineness of -0.043 mm accounted for 70% pH 8 ~ 9, and the amount of sodium silicate was 714 g / t ~ (-1). The collector GSY 1033 g t ~ (-1) was floatated at room temperature, and the REO grade was 67.84 and the recovery was 15.46%. The average REO grade of the two kinds of rare earth concentrate was 65.93 and the total recovery was 83.26%.
【作者单位】：广东省资源综合利用研究所稀有金属分离与综合利用国家重点实验室广东省矿产资源开发和综合利用重点实验室;
【基金】：四川省科技攻关计划项目(15ZC1801) 广东省省级科技计划项目(2016B070701026);广东省省级科技计划项目(2014B070705007) 广东省科学院高端领军人才培育培养资助专项项目资助
【分类号】：TD955

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