CN107755098B - 一种轻稀土矿物浮选高效抑制萤石的方法 - Google Patents
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Abstract
本发明涉及一种轻稀土矿物浮选高效抑制萤石的方法,针对萤石型稀土原矿,采用多胺基多羧基型氨羧络合剂FD‑1为萤石抑制剂、羟肟酸类药剂为捕收剂、2号油为起泡剂,浮选抑制萤石矿物,得到品位较高的稀土浮选精矿。本发明所用的抑制剂对萤石的选择性抑制作用强,浮选得到稀土精矿中稀土品位高、萤石含量少,且浮选流程结构简单。
Description
技术领域
本发明涉及一种轻稀土矿物浮选高效抑制萤石的方法,特别是适用于萤石型稀土矿浮选分离提纯,属于选矿技术领域。
背景技术
轻稀土矿物氟碳铈矿与萤石浮选分离是稀土选矿生产的一大难题。氟碳铈矿和萤石都属于半可溶盐类矿物,两种矿物表面性质相近,浮选分离难度较大,使得稀土浮选过程中萤石难以抑制,目前常规浮选方法为采用羟肟酸类捕收剂浮选稀土矿物,采用水玻璃抑制萤石等脉石矿物,然而水玻璃对萤石选择性抑制效果不好,即过量时会同时抑制萤石和稀土矿物,水玻璃用量较少时对萤石抑制作用又太弱,大量萤石进入稀土浮选精矿,增大了稀土冶炼过程的酸消耗量、能源消耗以及含氟气体的排放量。因此,为解决上述稀土浮选精矿中萤石带来的诸多问题,本发明提供了一种稀土矿物浮选高效抑制萤石的方法。
发明内容
本发明的目的是提供一种轻稀土矿物浮选高效抑制萤石的方法,即将萤石型稀土原矿磨细至其中稀土矿物单体解离度大于85%,pH调节至8.5-9.5,采用多胺基多羧基型氨羧络合剂FD-1为萤石抑制剂,羟肟酸类药剂(可以是辛基羟肟酸、苯甲羟肟酸和萘甲羟肟酸中的一种)为捕收剂,2号油为起泡剂,浮选分离原矿中的稀土矿物和萤石。该方法对萤石的选择性抑制原理为:羟肟酸类捕收剂能在稀土矿物和萤石表面生成疏水性的羟肟酸铈和羟肟酸钙沉淀,从而使两种矿物都能疏水附着气泡上浮,但抑制剂FD-1由于与钙离子生成可溶性络合物的络合稳定常数较大,所以能选择性地络合清洗萤石矿物表面的羟肟酸钙沉淀,从而起到对萤石的选择性抑制作用。
技术方案
本发明方法步骤如下:
(1)将萤石型稀土原矿在磨矿浓度60%~70%条件下磨细至-200目80%~95%,使磨矿产物中稀土矿物单体解离度大于85%;
(2)将步骤(1)中磨矿产物置于浮选槽中,加水稀释至矿浆浓度45%~55%,采用氢氧化钠或碳酸钠调整pH至8.5~9.5,加入600g/t~1000g/t的萤石抑制剂FD-1,搅拌2~3分钟,加入1500g/t~2000g/t的羟肟酸类捕收剂,搅拌2~3分钟,加入50g/t~80g/t的起泡剂2号油,搅拌2~3分钟后,充气量调至8L/min~10L/min,浮选时间4~6分钟,得到粗选精矿(泡沫产物)和粗选尾矿(槽内产物);
(3)将步骤(2)得到粗选精矿中加入100g/t~200g/t的萤石抑制剂FD-1,不加捕收剂和起泡剂,搅拌2~3分钟,充气量调至5L/min~7L/min,浮选时间3~5分钟,得到精选精矿和精矿尾矿;
(4)将步骤(3)所得的精选精矿作为最终稀土精矿,将步骤(2)所得粗选尾矿与步骤(3)所得精选尾矿合并作为最终尾矿;
(5)所述步骤(2)中萤石抑制剂FD-1为实验室合成的多胺基多羧基型氨羧络合剂,FD-1与钙离子具有较大的络合稳定常数;
(6)所述步骤(2)中羟肟酸类捕收剂为辛基羟肟酸、苯甲羟肟酸和萘甲羟肟酸中的一种。
本发明取得了显著的技术效果,具体为:1)本发明采用多胺基多羧基型氨羧络合剂FD-1为萤石抑制剂、羟肟酸类药剂为捕收剂、2号油为起泡剂,可以从稀土矿浮选中选择性抑制萤石,其对萤石的抑制作用原理为:羟肟酸类捕收剂与铈离子和钙离子形成的螯合物都具有较小的溶度积,因此羟肟酸类捕收剂能同时在氟碳铈矿和萤石矿物表面吸附,生产疏水性的羟肟酸金属螯合物沉淀,使氟碳铈矿和萤石表面疏水上浮,然而加入萤石抑制剂FD-1后,由于FD-1与钙离子具有较大的络合稳定常数,因此能络合清洗掉萤石表面疏水的羟肟酸钙沉淀,从而实现对萤石的选择性抑制。2)本发明所用的抑制剂对萤石的选择性抑制作用强,浮选得到稀土精矿中稀土品位高、萤石含量少,且浮选流程结构简单。
附图说明
图1为本发明从稀土矿中抑制萤石的浮选流程图。
具体实施方式
实施例:
以包头某一稀土选矿厂稀土浮选中矿为原矿,其RE2O3品位为35.6%、CaF2含量为38%,将原矿在磨矿浓度65%条件下磨细至-200目占90%,置于浮选槽中,加水稀释至矿浆浓度50%左右,采用氢氧化钠或碳酸钠调整pH至9.0左右,加入900g/t的萤石抑制剂FD-1,搅拌2分钟,加入1800g/t的辛基羟肟酸,搅拌2分钟,加入75g/t的起泡剂2号油,搅拌2分钟后,充气量调至10L/min,浮选时间5分钟,得到粗选精矿和粗选尾矿;将粗选精矿中加入150g/t的萤石抑制剂FD-1,不加捕收剂和起泡剂,搅拌2分钟,充气量调至6L/min,浮选时间4分钟,得到精选精矿和精矿尾矿,将精选精矿作为最终稀土精矿,将粗选尾矿与精选尾矿合并作为最终尾矿。
以常规药剂水玻璃为抑制剂,按照上述浮选工艺流程和参数,浮选得到最终稀土精矿合最终尾矿。
由表1结果可以看出,采用本发明萤石抑制方法,比常规药剂水玻璃取得的浮选分离指标好。
表1稀土矿浮选结果
Claims (1)
1.一种轻稀土矿物浮选高效抑制萤石的方法,其特征在于,所述方法步骤如下:
(1)将萤石型稀土原矿在磨矿浓度60%~70%条件下磨细至-200目80%~95%,使磨矿产物中稀土矿物单体解离度大于85%;
(2)将步骤(1)中磨矿产物置于浮选槽中,加水稀释至矿浆浓度45%~55%,采用氢氧化钠或碳酸钠调整pH至8.5~9.5,加入600g/t~1000g/t的萤石抑制剂FD-1,搅拌2~3分钟,加入1500g/t~2000g/t的羟肟酸类捕收剂,搅拌2~3分钟,加入50g/t~80g/t的起泡剂2号油,搅拌2~3分钟后,充气量调至8L/min~10L/min,浮选时间4~6分钟,得到泡沫产物即粗选精矿,以及得到槽内产物即粗选尾矿;
(3)将步骤(2)得到粗选精矿中加入100g/t~200g/t的萤石抑制剂FD-1,不加捕收剂和起泡剂,搅拌2~3分钟,充气量调至5L/min~7L/min,浮选时间3~5分钟,得到精选精矿和精矿尾矿;
(4)将步骤(3)所得的精选精矿作为最终稀土精矿,将步骤(2)所得粗选尾矿与步骤(3)所得精选尾矿合并作为最终尾矿;
所述步骤(2)中萤石抑制剂FD-1为实验室合成的多胺基多羧基型氨羧络合剂;所述步骤(2)中羟肟酸类捕收剂为辛基羟肟酸、苯甲羟肟酸和萘甲羟肟酸中的一种。
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