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Beneficiation of rare earth minerals from Bokan Mountain - Dotson Ridge ore.

机译：博坎山-Dotson Ridge矿石中稀土矿物的选矿。

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摘要

The purpose of this research work was to study the beneficiation of rare earth ore of the Bokan Mountain - Dotson Ridge deposit, located near Ketchikan, Alaska. Rare earth element (REE) composite ore samples from the Bokan Mountain - Dotson Ridge deposit were tested using gravity concentration, magnetic separation, flotation, and leaching techniques to separate the REE. The composite ore sample was a product of a preliminary x-ray sorting process. Qualitative electron microprobe analysis of the ore showed that most of the REE minerals in the ore were silicate minerals. Since the electron microprobe analysis samples were coated with carbon during sample preparation, the carbon element was inactivated for analysis. Because of this, carbonate compounds of minerals' particles could not be detected. 95% of the REE mineral particles appear to be smaller than about 10 microm in size (about 100 microm2 in area).;For the gravity concentration, light rare earth elements (LREE) and heavy rare earth elements' (HREE) individual elemental recovery values were in the ranges of 49.6-52.8% and 46.3-48.8%, respectively, at 25% of mass yield. In order to separate a larger amount of the REE, a wet high intensity magnetic separation (WHIMS) test was carried out on tailings of the gravity concentration tests. The HREE individual elemental recovery values ranged from 56.3-63.1% at 37% mass yield, while LREE individual elemental recovery values were in the 57.9% - 59.1% range. For the combined gravity and magnetic separation processes, the net individual elemental recovery values of the LREE and the HREE were in the range of 79.6-80.5% and 76.5-80.9%, respectively. The combined mass yield of the gravity and magnetic separation processes was 53%.;Direct leaching tests conducted on the composite ground ore feed yielded high individual elemental recovery values of 90-92% of the LREE. The HREE individual elemental recovery values ranged from 56.5-87.3%. In the leaching, 20% HCl was used in the 1st and 2nd stages with a duration of 2 hrs in each stage at 90°C. The solid percentage of the leach slurry was 20% w/w.;The composite ground ore sample was tested in conventional flotation using a 2.0 L capacity Denver cell. In the flotation, 0.05 kg/tonne of Cytec Aero 6493 collector, 0.05 kg/tonne of Cytec Aero Froth 88, and 0.1 kg/tonne of sodium metasilicate as a depressant were used. Pulp pH was set around 9. Results showed individual elemental recovery values in the range of 44.6-50.4% for the LREE. The HREE individual elemental recovery values ranged from 27.9-44.5%. The mass yield of the flotation was 23%. The flotation recoveries reported here are significantly lower than what was achieved previously. For the Leach after flotation process, leaching was conducted on the first concentrate of flotation. Individual elemental recovery values of the LREE and HREE were 94.7-96.5% and 61.1-90.5%, respectively. The concentrate was leached using 20% HCl in both the 1st and 2nd stages, with a duration of 2 hrs in each stage at 90°C. Flotation/Leach process net recoveries of LREE by individual elemental values ranged from 42.2-48.5%. HREE net recoveries by individual elemental values ranged from 17.1-41.4%.
机译：这项研究工作的目的是研究位于阿拉斯加Ketchikan附近的Bokan Mountain-Dotson Ridge矿床的稀土矿的选矿。使用重力集中，磁选，浮选和浸出技术分离REE，对来自Bokan Mountain-Dotson Ridge矿床的稀土元素（REE）复合矿石样品进行了测试。复合矿石样品是初步X射线分选过程的产物。对矿石进行定性电子探针分析表明，矿石中的大多数REE矿物均为硅酸盐矿物。由于电子微探针分析样品在样品制备过程中被碳覆盖，因此碳元素被灭活以进行分析。因此，无法检测到矿物颗粒的碳酸盐化合物。 95％的REE矿物颗粒似乎小于约10微米（面积约100平方米）.;对于重力浓度，轻稀土元素（LREE）和重稀土元素（HREE）的单个元素回收率当质量产率为25％时，该值分别在49.6-52.8％和46.3-48.8％的范围内。为了分离大量的稀土元素，对重力浓度测试的尾矿进行了湿式高强度磁选（WHIMS）测试。质量分数为37％时，HREE的单个元素回收率范围为56.3-63.1％，而LREE的单个元素回收率范围为57.9％-59.1％。对于重力和磁分离的组合过程，LREE和HREE的净单个元素回收值分别在79.6-80.5％和76.5-80.9％的范围内。重力和磁选过程的总质量产率为53％。；对复合地面矿石进料进行的直接浸出试验产生的高单个元素回收值为LREE的90-92％。 HREE的单个元素回收率范围为56.5-87.3％。在浸出过程中，第一阶段和第二阶段使用20％HCl，在90°C下各阶段持续2小时。浸出浆液的固体百分比为20％w / w。复合磨矿样品在常规浮选中使用2.0L容量的Denver池进行测试。在浮选中，使用0.05千克/吨的Cytec Aero 6493捕收剂，0.05千克/吨的Cytec Aero Froth 88和0.1千克/吨的偏硅酸钠作为抑制剂。纸浆的pH值设置在9左右。结果表明，LREE的单个元素回收率在44.6-50.4％的范围内。 HREE的单个元素回收率范围为27.9-44.5％。浮选的质量产率为23％。此处报道的浮选回收率明显低于以前的回收率。对于浮选后的浸出过程，对第一浮选精矿进行浸出。 LREE和HREE的元素回收率分别为94.7-96.5％和61.1-90.5％。在第一阶段和第二阶段均使用20％HCl浸提浓缩液，在90°C下每阶段持续2小时。浮选/浸出过程的LREE净回收率按单个元素值范围为42.2-48.5％。 HREE净回收率按单个元素值范围为17.1-41.4％。

著录项

  • 作者

    Narantsetseg, Purevbaatar.;

  • 作者单位

    University of Alaska Fairbanks.;

  • 授予单位 University of Alaska Fairbanks.;
  • 学科 Engineering Materials Science.;Mineralogy.
  • 学位 M.S.
  • 年度 2014
  • 页码 106 p.
  • 总页数 106
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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