摘要
高纯石英原料的识别、选择和评价是高纯石英制备的关键因素,然而现有的工艺矿物学评价方法多为定性描述,难以量化评价高纯石英原料的提纯潜力。依托基于扫描电子显微镜(SEM)和X射线能谱仪(EDS)的矿物自动分析系统(BPMA),测定了高纯石英原料中杂质矿物的组成和含量、矿物解离度、连生特征、嵌布粒度等决定杂质可选性的关键矿物学参数,并构建了高纯石英原料提纯潜力的矿物学评价方法。结果表明,该高纯石英原料中石英颗粒内部“纯净”,流体包裹体孔隙少见,杂质矿物主要为白云母,其次为铝(镁,钙)氧化物、钙铁榴石和钾长石等;杂质矿物含量合计0.22%,其中,单体(100%解离)、富连生体(>75%解离)、贫连生体(<25%解离)占有率分别为50.97%、23.57%和11.21%;被石英包裹的杂质矿物占0.55%,与石英呈裸露连生的占48.48%;杂质矿物嵌布粒度较粗,中粒级(0.295~0.074 mm)、细粒级(0.074~0.010 mm)和微粒级(<0.010 mm)占有率分别为51.40%、46.01%和2.59%。基于定量矿物学数据,初步得出该高纯石英原料在现有经济技术条件下具有生产99.998%(4N8)级0.45~0.105 mm(40~140目)高纯石英砂的潜力。
The identification,selection,and evaluation of high-purity quartz(HPQ)raw materials are the key factors for the preparation of HPQ.However,the existing process mineralogy evaluation methods for HPQ raw materials are still imperfect and mostly qualitative descriptions,making it difficult to quantitatively assess the purification potential of HPQ raw materials.We used an automated mineralogy system with version 2.0 BPMA software,which is based on scanning electron microscope(SEM)equipped with energy dispersive X-ray spectrometer(EDS),to conduct a quantitative mineralogy characterization on the occurrence state of impurity minerals in a HPQ raw material.Key mineralogical parameters determining the separability of impurities,such as the composition and content,mineral liberation,mineral locking relationship,and grain size distribution of impurity minerals in the HPQ raw materials,were measured.Furthermore,a quantitative mineralogical assessment method for the purification potential of HPQ raw materials was established.The results showed that the quartz particles are internally“pure”,with rare fluid inclusion pores.The impurity minerals are mainly muscovite,followed by Al(Mg,Ca)oxides,andradite,and K-feldspar.The content of impurity minerals in the HPQ raw materials was 0.22%,among them,the proportions of free particles(100%liberated),highly liberated particles(>75%liberated),and poorly liberated particles(<25%liberated)are 50.97%,23.57%,and 11.21%,respectively.And the proportion of impurity mineral inclusion,which is enclosed by quartz,is 0.55%,while the proportion of exposed impurity minerals intergrowth,which are exposed intergrowth with quartz,is 48.48%.The grain size of impurity minerals is relatively coarse,and the proportions of medium-sized particles(0.295-0.074 mm),fine-sized particles(0.074-0.010 mm),and micro-sized particles(<0.010 mm)are 51.40%,46.01%,and 2.59%,respectively.According to the quantitative mineralogical data by BPMA,it is preliminarily determined that the processing and purification limit of the HPQ raw materials under existing economic and technological conditions is greater than 99.998%(4N8),indicating its potential for producing 4N8 grade 0.45-0.105 mm(40-140 mesh)HPQ sands.
作者
温利刚
赵建军
付强
王清
贾木欣
WEN Ligang;ZHAO Jianjun;FU Qiang;WANG Qing;JIA Muxin(State Key Laboratory of Intelligent Optimized Manufacturing in Mining&Metallurgy Process,BGRIMM Technology Group,Beijing 102628,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)
出处
《有色金属(选矿部分)》
2025年第3期118-126,共9页
Nonferrous Metals(Mineral Processing Section)
基金
国家重点研发计划重点专项项目(2021YFC2903101,2021YFC2903100)
矿冶科技集团有限公司科研基金项目(JTKY02-2275)。
