陕南黑木林纤维水镁石矿地质特征及应用前景浅析

GEOLOGICAL CHARACTERISTICS AND ANALYSIS OF APPLICABLE PROSPECT OF NEMALITE DEPOSIT IN HEIMULIN OF SOUTHERN SHAANXI PROVINCE

黑木林纤维水镁石矿是目前全球范围内已知的最大纤维水镁石矿床,赋存于加里东期侵入的超基性岩——斜方辉石橄榄岩中,该岩体已完全蛇纹岩化。矿体平均厚度约400m,长2400m,平面形态呈一长的透镜状。纤维水镁石平均品位4.322%。纤维水镁石是水镁石的变种矿物。纤维水镁石矿物呈纤维状或片状集合体,成分接近于水镁石理论值。属三方晶系,晶体结构属层状。成分中的Mg2+部分被Fe2+、Mn2+、Zn2+及Ni2+类质同象替代,形成变种矿物富镍水镁石、镍锌水镁石和铁水镁石。目前水镁石主要应用于提取Mg和MgO原料、重烧镁砂、增强和补强材料、造纸填料及阻燃材料等工业领域,尤其是在生产氢氧化镁阻燃剂方面前景广阔,国内研究与国际水平接近。开发具有高附加值的氢氧化镁阻燃剂产品,是本纤维水镁石矿优先发展方向。

The Heimulin of southern Shaanxi nemahte mine is currently me largest worlclwide Known nemantv ueposit occurring in the intrusive ultrabasic rock--inclined orthopyroxene in peridotite, which is completely serpentinized The average thickness of ore body is about 400m and its length is 2400m. The plane form shows a long lens. The average grade of ore body is about 4.322%. The nemalite is variant mineral of brucite. It is a fibrous or flaky aggregate, which is close to theoretic brucite value. It is said to be the trigonal crystal system with layered structure. The Mgz＋ of component is isomorphism substituted to form variant minerals, such as nickel-rich brucite, nickel-zinc brucite and iron-rich brucite by Fe2＋,Mna＋,Znz＋ and Ni2＋. Now, it is mainly used for abstracting Mg and MgO raw materials, dead-burning magnesium, enhancing and reinforcing materials, paper filling and flame retardant materials and other industrial areas, especially being prosperous in the production of Mg （OH） 2 flame retardant on which the level of study is close to that of the international. The research of Mg （OH） 2 flame retardant with highly added value comes to the prior development direction for nemalite.