现代矿业 ›› 2024, Vol. 40 ›› Issue (03): 131-135.

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罗布莎低品位铬铁矿工艺矿物学研究

为查清西藏罗布莎低品位铬铁矿的矿石性质，采用化学分析、光学显微镜鉴定、扫描电 镜分析、EDS微区成分分析等岩矿测试手段，对矿样的化学组成、矿物组成、矿物嵌布特征、主要矿物 的工艺粒度、铬元素的赋存状态进行了详细的工艺矿物学研究。结果表明：矿石有价成分Cr2O3含量 18.50%，有害成分MgO和SiO2含量分别为35.32%，26.55%，主要含铬矿物为铝-铁镁铬铁矿，脉石矿物 主要为含铬硅酸盐矿物橄榄石和蛇纹石，另含少量的绿泥石、辉石、方解石和铁白云石，以及微量的钾 长石、黄铁矿等；铬铁矿嵌布粒度粗细不均，通常与橄榄石、蛇纹石、绿泥石紧密共生，部分微细粒铬铁 矿被橄榄石包裹，不易解离；铬元素主要赋存在铬铁矿中，少量赋存在橄榄石、蛇纹石和绿泥石中，铬 铁矿单矿物平均含铬 39.17%，橄榄石和蛇纹石单矿物平均含铬 0.44%，绿泥石单矿物平均含铬 1.15%。   

Study on Process Mineralogy of Luobusha Low-grade Chromite Ore

In order to find out the ore properties of Luobusha low-grade chromite in Tibet，chemical analysis，optical microscope identification，scanning electron microscope analysis，EDS micro-area compo⁃ sition analysis and other rock and mineral testing methods were used to study the chemical composition， mineral composition，mineral dissemination characteristics，process particle size of main minerals and oc⁃ currence state of chromium elements of ore samples in detail.The results show that the content of Cr2O3 is 18.50%，and the contents of harmful components MgO and SiO2 are 35.32% and 26.55% respectively. The main chromium-containing minerals are aluminum-iron-magnesium chromite. The gangue minerals are mainly chromium-containing silicate minerals olivine and serpentine，and a small amount of chlorite，pyrox⁃ ene，calcite and ankerite，as well as trace amounts of potassium feldspar and pyrite.The grain size of chro⁃ mite is uneven，and it is usually closely associated with olivine，serpentine and chlorite. Some fine chromite is wrapped by olivine，which is not easy to dissociate. Chromium mainly occurs in chromite，and a small amount occurs in olivine，serpentine and chlorite. The average chromium content of chromite single mineral is 39.17%，the average chromium content of olivine and serpentine single mineral is 0.44%，and the aver⁃ age chromium content of chlorite single mineral is 1.15%.   

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