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Behavior of ore froming elements in the weathering profiles of nickeliferous laterite deposits.

含镍红土矿床风化剖面中矿石元素的行为。

基本信息

批准号：
03640672
负责人：
OGURA Yoshio
金额：
$ 1.34万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

In this report, consideration is given to the chemical behavior of several elements and constitute minerals according to their depth in the weathering profile of the pulot, Rio Tuba and Hinatowan nickel deposits in the Philippines.In order to present the profile of the ore deposit in a model, on the basis of mineralogical charter, it can be divided into two layers from surface to bed rock, i. e., the upper part is compose of oxidized red laterite ore and the lower one, so-called garnieritic ore, actually saprolite or decomposed serprntinite.A clear difference exists between the chemical composition and constitute minerals in the upper and lower layers. The principal minerals are goethite in the upper layer and serpentine is most common in the lower one with small amount of clay minerals. In some cases, a thin secondary silica layer is intercalated near the boundary.It has been revealed that there is an increase of element Fe_2O_3 together with a decrease of elements SiO_2 and MgO, of w … More hich phenomenon is characterized by respective alternating stage in the bed rock - saprolite- laterite sequence. Minor elements show no difference between saprolite and laterite.Iron in laterite occurs mainly as hydrated oxide (goethite), but due to progressive dehydration, higher gravity oxides chromite and hematite and maghemite may appear in increasing amount toward the surface. The iron content decrease toward the lower part of laterite zone. Nickel is concentrated with goethite in laterite and partly with hydrous nickel-iron- magnesium silicates in the saprolite layer.In the ores, chemical components are closely related to the particle size of the constitute minerals. In the laterite - transitional-saprolite- sequence, a common variation range and tendency in chemical composition (both major and minor components) for each particle size can be seen. However, taking samples with the same particle size the chemical composition obviously differed, representing the characteristics of the components for each zone. This fact indicates the zone of each characteristic layer corresponding to the depth and the degree of size reduction which depends on the dissolution-residual of the mother rock component occurring in the formation process of weathering (lateritization). Less

本文研究了菲律宾Pulot、Rio Tuba和Hinatowan镍矿床风化剖面中几种元素和组成矿物的化学行为，根据矿物学特征，将矿床从地表到基岩分为两层，即第一层和第二层。例如，上部为红色氧化红土矿，下部为腐泥岩或腐解蛇纹岩，其化学成分和组成矿物有明显差异。上层矿物以针铁矿为主，下层以蛇纹石为主，含少量粘土矿物。在某些情况下，在界面附近有一层薄的二次氧化硅层插入，表明Fe_2O_3元素增加，SiO_2和MgO元素减少，w ...更多信息这种现象的特征是在基岩-腐泥土-红土序列中有各自的交替阶段。微量元素在腐泥土和红土之间没有区别。红土中的铁主要以水合氧化物（针铁矿）的形式存在，但由于逐渐脱水，更高比重的氧化物铬铁矿、赤铁矿和磁赤铁矿可能会向表面增加。铁含量向红土带下部递减。镍在红土中以针铁矿的形式富集，在腐泥层中以含水的镍铁镁硅酸盐的形式富集，矿石中化学成分与组成矿物的粒度密切相关。在红土-过渡-腐泥土序列中，可以看到每个粒度的化学成分（主要和次要组分）的共同变化范围和趋势。然而，取相同粒度的样品，其化学成分明显不同，代表了每个区域组分的特征。这一事实表明，每个特征层的区域对应于深度和尺寸减小的程度，这取决于风化（红土化）形成过程中发生的母岩成分的溶解残留。少