Process and Mechanism Study on Activation Pretreatment of Limonitic Laterite Ores at Low Temperature

被引：0
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作者：
Ma B. [1 ,2 ]
Jin B. [1 ]
Pei Y. [1 ]
Yang W. [1 ,2 ]
Wei Y. [1 ]
Wang C. [1 ,3 ]
机构：
[1] State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming
[2] Beijing General Research Institute of Mining and Metallurgy, Beijing
[3] Institute of Metallurgical and Ecological Engineering, Beijing University of Science and Technology, Beijing
来源：
Jin, Bingjie (jinbingjie18@163.com) | 1600年 / Editorial Office of Chinese Journal of Rare Metals卷 / 41期
关键词：
Activation pretreatment at low temperature; Limonitic laterite; Mineral phase transformation;
D O I：
10.13373/j.cnki.cjrm.XY16040032
中图分类号：
学科分类号：
摘要：
The pretreatment process of limonitic laterite ores at low temperature and the mineral phase transformation mechanism were studied. The effects of temperature, duration, sulfuric acid and water addition on the activation pretreatment were investigated. The results showed that the extractions of Ni and Co increased with the increase of temperature, acid addition and duration, and adding a certain amount of water was beneficial to the extraction of Ni and Co. The optimal activation pretreatment conditions were as follows: the temperature was 450℃, the amount of sulfuric acid addition was 500 kg per ton of ore, the duration was 60 min and the water addition was 20%. Under these conditions, the extraction of Ni, Co and Fe were 78.1%, 91.1% and 9.6%, respectively. Thermogravimetry and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) were utilized to explore the mechanism of mineral phase transformation during the activation pretreatment process at low temperature. The results suggested that mineral phase transformation could not be completed below 200℃, and the main phase was goethite (FeOOH). FeOOH could partly transform into hematite (Fe2O3) and insoluble ferric subsulfate (Fe(OH)SO4) at 250℃. Mineral phase could be effectively transformed at the temperature range of 300~350℃, and the majority of FeOOH could transform into Fe2O3. Fe(OH)SO4 transformed into Fe2O3 when the temperature reached 400℃. Fe2O3 with good crystallinity was the dominant mineral phase at the temperature of 450℃, and Fe2O3 was still dominant phase at 500℃, while Fe(OH)SO4 transformed into ferric sulfate (Fe2(SO4)3). The majority of Ni- and Co-bearing minerals could transform into soluble sulphates, and the minority transformed into insoluble nickel ferrite (NiFe2O4) and cobalt ferrite (CoFe2O4) which resulted in the loss of Ni and Co. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：1159 / 1166
页数：7
相关论文
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