新疆巴里坤县拉伊格来克膨润土矿Ⅰ矿段膨润土矿物学特征

摘要

The Layigrac bentonite mine formed mainly by fluid action ,hydrolyzed and altered the basalt, basalt-ic andesite and intermediate-felsic volcaniclastic rock deposited in the volcanic sedimentary basin .From miner-alogy geological background, the mineralogical characteristics, chemical composition, physical-chemical proper-ties, mineral fabrics and application attributes of montmorillonite from Ore Block I are studied .The conclusions are: (1)Average content of montmorillonite is 68.01%, and w(Al2O3) is 18.45%, showing a relatively high level.(2)The ore displays a slightly higher glial price ( >100 mL/15 g),in swelling capacity (36.0 mL/g) and specific surface area (395 m2/g).(3) ENa +/CEC>69.0%.(4) X-ray diffraction analysis discloses the minerals d(001) value of 1.22-1.35 nm.Therefore, the bentonite in the ore block is a kind of high-quality bentonite mineral resource with combined attributes of sodium base and calcium-sodium base,relatively higher contents of montmorillonite, excellent texture, and strong heat resistance.%拉伊格来克膨润土矿主要是由玄武岩、玄武安山岩及中酸性火山碎屑岩于火山盆地沉积，后经过流体作用发生水解蚀变而成。结合成矿地质背景，从矿物学角度研究了矿区Ⅰ号矿段膨润土的矿石特征、蒙脱石化学成分、物化性质、矿物组构、应用属性等，结果表明：蒙脱石平均含量68.01％； w （Al2O3）18.45％，含量相对较高；矿石胶质价（＞100 mL/15 g）、膨胀容（36.0 mL/g）、比表面积（395 m2/g）均偏高； ENa ＋/CEC＞69.0％； X射线衍射分析， d（001）在1.22～1.35 nm。综合认为该矿段膨润土主要属钠基和钙钠基，蒙脱石相对含量高，质地优，耐热性能强，是一种优质的膨润土矿产资源。