云南镇雄羊场磷矿高品位磷块岩工艺矿物学研究
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P619.21+3

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云南省地质勘查基金项目(D202001,K202101,K202301,Y202301)


Study on process mineralogy of the high grade phosphorite in Yangchang phosphate deposit, Zhenxiong, Yunnan Province
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    摘要:

    云南省镇雄县羊场磷矿是近年来评价的早寒武世超大型沉积磷块岩矿床,具有资源储量大、矿石品质优、资源分布集中的特点,为目前亚洲最大规模隐伏单体富磷矿床。本文主要采用矿物参数自动定量分析系统(AMICS)、扫描电子显微镜-能谱仪(SEM-EDS)、X射线荧光光谱仪(XRF)、电感耦合等离子体质谱仪(ICP-MS)和偏光显微镜等分析手段,对该矿床磷块岩矿石的化学成分、矿物组成、嵌布特征、嵌布粒度和连生关系、解离度等进行了系统工艺矿物学研究,并初步探讨了磨矿细度和选矿方法。研究表明,矿石属高品位硅-钙质碳酸盐型磷块岩矿石,P2O5含量29.34%,有用矿物为氟磷灰石,常呈隐晶-微晶集合体形式产出(俗称胶磷矿);脉石矿物主要为石英、方解石、白云石及少量黄铁矿等,矿石具低镁低硅特征,可采用正-反浮选法选矿;矿石嵌布粒度细,连生关系复杂,不易解离,选矿时需细磨以增加单体解离度,但需注意过磨产生机械夹带和泥化等问题对浮选指标的影响;矿石已达到磷精矿指标,可直接加工利用,若需选矿,建议重点研究磨矿工艺,探索联合选矿方法,以期达到理想的选别效果。

    Abstract:

    The Yangchang phosphate deposit in Zhenxiong County, Yunnan Province is a super large sedimentary phosphate deposit evaluated in recent years in the Early Cambrian period. It is characterized by large resource reserves, excellent ore quality, and concentrated resource distribution, and is currently the largest hidden single rich phosphate deposit in Asia. This article mainly uses different analysis methods to conduct systematic mineralogical research on the chemical composition, mineral composition, embedding characteristics, embedding particle size and intergrowth relationship, dissociation degree of the phosphate ore in the deposit. The grinding fineness and ore sorting process methods are also preliminarily explored. Our results show that the samples in this study are high-grade silicon calcium carbonate phosphate ore, with a P2O5 content of 29.34%. The main P-bearing mineral in the ore is fluorapatite which commonly distribute as hidden crystal microcrystal aggregates (commonly known as collophane). The main gangue minerals are quartz, calcite, dolomite, and a small amount of pyrite. The ore is characterized by low magnesium and low silicon, and can be processed using the direct-reverse flotation method. The ore has fine particle size and complex interrelationships, making it difficult to dissociate. During the beneficiation, fine grinding is required to increase the degree of monomer dissociation, but the impact of mechanical entrainment and mud formation caused by excessive grinding on flotation indicators should be paid special attention. The ore has reached the phosphate concentrate index and can be directly processed and utilized. If beneficiation is required, it is recommended to focus on studying the grinding process and exploring joint beneficiation methods to achieve the desired beneficiation effect.

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黄太平,夏建峰,米云川,等, 2024. 云南镇雄羊场磷矿高品位磷块岩工艺矿物学研究[J]. 岩石矿物学杂志, 43(5):1188~1198.
HUANG Tai-ping, XIA Jian-feng, MI Yun-chuan, et al, 2024. Study on process mineralogy of the high grade phosphorite in Yangchang phosphate deposit, Zhenxiong, Yunnan Province[J]. Acta Petrologica et Mineralogica, 43(5): 1188~1198.

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  • 收稿日期:2024-05-19
  • 最后修改日期:2024-08-08
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  • 在线发布日期: 2024-09-25
  • 出版日期: 2024-09-25