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首页> 外文期刊>Revista de Metalurgia >Thermodynamic analysis of the reduction process of Colombian lateritic nickel ore
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Thermodynamic analysis of the reduction process of Colombian lateritic nickel ore

机译:哥伦比亚红土镍矿还原过程热力学分析

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摘要

The Colombian nickeliferous laterites are minerals used for the nickel extraction by hydrometallurgical and pyrometallurgical processes. In this work the thermodynamic behaviour of three Colombian lateritic mineral samples are described, with contents of 1.42, 1.78 y 2.04 of nickel, when they are subjected to the calcination and reduction processes. The mineral was characterized using X Rays Diffraction and X Rays Fluorescence, giving evidence of the presence of mineralogical species such as nepouite (Ni3Si2O5(OH)(4)), goethite (Fe2O3 center dot H2O), silica (SiO2), antigorite (Mg3Si2O5(OH)(4)) and fosferite (Mg2SiO4). The thermodynamic analysis was conducted using the software HSC Chemistry for Windows 5.1 and was focused in the quantitative determination of the chemical evolution of the mixture of these minerals with variable quantities of coal, in function of temperature. The results produced by the program showed, in the equilibrium, the feasibility of complete reduction of the nickel, and additionally, a considerable high percentage of reduction of iron oxides (up to 99) using ratio C/O approximate to 1 at temperatures close to 1100 degrees C.
机译:哥伦比亚镍质红土是通过湿法冶金和火法冶金工艺用于镍提取的矿物。在这项工作中,描述了三个哥伦比亚红土矿物样品在煅烧和还原过程中的热力学行为,镍含量为1.42%、1.78%和2.04%。使用X射线衍射和X射线荧光对矿物进行了表征,证明了矿物学物种的存在,例如nepouite(Ni3Si2O5(OH)(4)),针铁矿(Fe2O3中心点H2O),二氧化硅(SiO2),反石(Mg3Si2O5(OH)(4))和磷铁矿(Mg2SiO4)。热力学分析是使用软件 HSC Chemistry for Windows 5.1 进行的,重点是定量测定这些矿物与不同数量的煤的混合物的化学演变,随温度的变化。该计划产生的结果表明,在平衡状态下,镍完全还原的可行性,此外,在接近 1100 摄氏度的温度下,使用近似于 1 的 C/O 比,氧化铁的还原百分比相当高(高达 99%)。

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