Development of Mineral Processing Technique of Unused Iron Resources Existing Abundantly in Asian Region.

本研究主要研究红土型和含锰低品位铁矿石.在红土上。(1)菲律宾某大型红土矿厂浸出渣中的铁含量随操作时间的变化在42%~ 56%之间。另一方面，铁含量根据颗粒大小而变化很大。也就是说，负20 μ m的部分显示最大铁含量，而74至105 μ m的部分显示最小铁含量。(2)浸出残渣中含有大量的细颗粒。负37 μ m的重量百分比达到约70%。(3)铁矿资源以磁铁矿状氧化铁为主，并伴有少量的浮氏体。大多数类磁铁矿铁氧化物不是纯的，它们含有<Mg^（2+）>、<Cr^（3+）>和<Al^（3+）>，变化很大。(4)对20 ~ 37 μ m的粗渣进行磁选，可实现铁资源的有效提质。由于20 ~ 37 μ m的筛下物品位较高，且不易磁选，因此可作为铁精矿的一部分不经分选直接使用.含锰低品位铁矿石。(1)越南北方铁矿石为褐铁矿，主要成分矿物为针铁矿和石英，并含有少量三水铝石和赤铁矿。在针铁矿中，Mn均匀分布，取代Fe。(2)褐铁矿石中游离的石英和三水铝石可以用强磁选法除去，但锰矿物的分离似乎比较困难。(3)低强度磁选表明，从还原产物获得的精矿含有80%的铁和1.5%的锰。

Laterite and manganiferous low grade iron ore were mainly investigated in this study.1. On laterite.(1) Iron content in the leach residue from a large- scale laterite plant in Philippines varies from about 42 to 56% with change of the operating time. On the other hand, the iron content greatly varies dependent on particle size. That is, the minus 20 um portion shows the maximum iron content, while 74 to 105 um of that shows the minimum one.(2) The leach residue contains a large quantity of fine particles. Weight percnt of the minus 37 um reaches approximately 70%.(3) The iron resources are mainly composed of magnetite-like iron oxides, which are accompanied by a small quantity of wustite. Most of the magnetite-like iron oxides are not pure and they contain <Mg^(2+)> , <Cr^(3+)> , and <Al^(3+)> with a wide variation.(4) Effective upgrading of the iron resoures may be realized by magnetic separation on oversize of 20 to 37 um of the residue. Since undersize of 20 to 37 um is relatively high grade and refractory to magnetic separation, it can be used as a part of iron concentrate without separation.2. On manganiferous low grade iron ore.(1) The iron ore from the northern district of Vietnam is a kind of limonite containing goethite and quartz as the major constituent minerals, and a small quantity of gibbsite and hematite. In the goethite, Mn is homogeneously distributed, substituting for Fe.(2) The removal of free particles of quartz and gibbsite from the limonite ore is possible by high-intensity magnetic separation, but the removal of manganese mineral by this method seems to be difficult.(3) Low intensity magnetic separation showed that the concentrate obtained from a reduction product contains 80% Fe and 1.5% Mn.