含锡锌铁矿的矿物学特性及其综合利用新技术

来源期刊:中南大学学报(自然科学版)2011年第6期

论文作者:张元波 陈丽勇 李光辉 姜涛 黄柱成

文章页码:1501 - 1508

关键词:铁矿;矿物学;锡;锌

Key words:iron ore; mineralogy; tin; zinc

摘    要:

研究含锡锌复杂铁精矿的矿物学特性,并开发含锡锌铁精矿球团预氧化-弱还原焙烧新技术。研究结果表明:铁精矿中的主要载铁矿物为磁铁矿,主要含锡矿物为锡石,主要含锌矿物包括闪锌矿和铁闪锌矿,其中闪锌矿占绝大部分;以单体锡石形式存在的锡占54.78%,而磁铁矿颗粒中的锡占41.31%;磁铁矿中的锡绝大部分为锡石的微细粒包体;88.95%的锌存在于硫化矿中,闪锌矿多以单体粒状或以不规则状与磁铁矿及其他矿物构成连生体;在w(C)/w(Fe)为0.2,焙烧温度为1 075 ℃,时间为50 min时,球团矿抗压强度为2 380 N/个,Sn和Zn的挥发率分别为71.86%和56.28%,残余Sn和Zn含量均小于0.08%。

Abstract:

The mineralogy of the tin, zinc-containing iron concentrates was researched and a novel utilization technology of pellet pre-oxidation-weak reduction roasting was developed. The results show that, the major iron-carrying mineral is magnetite, the primary tin-bearing mineral is cassiterite, and the zinc-containing minerals are a large quantity of sphalerite and a few of marmatite. 54.78% Sn exists as cassiterite monomers, and 41.31% Sn is embedded in magnetite, existing as the form of tiny granule inclusion of cassiterite, which is proved by the results of Electron Probe. 88.95% Zn exists as sulfide minerals, in addition, granular and irregular sphalerite particles are enwrapped in the magnetite and other minerals. 2 380 N/P of pellet compression strength, 71.86% of Sn volatilization, and 56.28% of Zn volatilization can be obtained under the conditions of roasting temperature 1 075 ℃, roasting time 50 min and w(C)/w(Fe) 0.2. The residual Sn and Zn contents in the roasted pellets are both less than 0.08%.

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