瑞木红土矿摇床铬铁矿粗精的磁选富集

瑞木红土矿中存在含铬尖晶石矿物,在进行矿浆管道输送和高压浸出之前需要先经过铬矿选矿处理,以减轻对管道和高压釜的磨损.目前瑞木红土矿项目选矿得到的铬铁矿精矿其铬铁质量分数比(w(Cr2O3)/w(Fe O))仅为2.3,不能满足冶金级铬铁矿的要求.针对瑞木红土矿项目摇床分选所得的铬铁矿粗精矿开展了工艺矿物学和磁选提高铬铁质量分数比的研究.筛分实验和矿物提纯实验结果表明,去除细颗粒矿物以及分离脉石矿物是提高铬铁矿铬铁质量分数比的有效途径.对筛分后的+0.074 mm的粗精矿进行磁选分离,所得到的铬铁矿精矿铬铁质量分数比为2.59,铬回收率为63.89%.

Magnetic Separation and Enrichment of Rough Chromite Concentrate from the Ramu Laterite Project

As the existence of chromium related spinel ores may cause serious wear on the pipe and autoclave during the pipe transportation and high pressure acid leaching procedure， it is necessary to remove the chromium containing minerals from the nickeliferrous laterite ore from Ramu， Papua New Guinea. The main problem in the beneficiation of chromite in the Ramu project is that the w(Cr₂O₃):w(FeO) of chromite concentrate is merely 2.3， which can not meet the standard of metallurgical chromite product. This paper presents the results of detailed characterization of process mineralogy and magnetic separation of rough chromite concentrate obtained from tabling separation procedure of the Ramu project. The screen classification and purification tests show that the w(Cr₂O₃):w(FeO) of the rough chromite concentrate could be further enhanced by eliminating the fines and other gangue minerals. The magnetic separation of the +0.074mm rough chromite concentrate increased the w(Cr₂O₃):w(FeO) to 2.59 with 63.89% recovery of chromium.