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首页> 外文期刊>Revista de metalurgia >Análisis termodinámico del proceso de reducción de minerales lateríticos de níquel colombianos
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Análisis termodinámico del proceso de reducción de minerales lateríticos de níquel colombianos

机译:哥伦比亚镍红土矿物还原过程的热力学分析

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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 (Ni 3 Si 2 O 5 (OH) 4 ), goethite (Fe 2 O 3 .H 2 O), silica (SiO 2 ), antigorite (Mg 3 Si 2 O 5 (OH) 4 ) and fosferite (Mg 2 SiO 4 ). 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 ≈1 at temperatures close to 1100 °C.
机译:哥伦比亚含镍红土是用于通过湿法冶金和火法冶金工艺提取镍的矿物。在这项工作中,描述了三种哥伦比亚红土矿物样品的热力学行为,当它们经过煅烧和还原过程时,镍含量分别为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表征,从而证明存在矿物学物种,例如锂辉石(Ni 3 Si 2 O 5(OH)4),针铁矿(Fe 2 O 3 .H 2 O),二氧化硅(SiO 2),蛇纹石(Mg 3 Si 2 O 5(OH)4)和磷铁矿(Mg 2 SiO 4)。使用用于Windows 5.1的HSC Chemistry软件进行热力学分析,重点是根据温度函数定量确定这些矿物与数量可变的煤的混合物的化学演化。该程序产生的结果表明,在平衡状态下,完全还原镍的可行性是可行的,此外,在接近200℃的温度下使用C / O≈1时,氧化铁的还原率很高(高达99%)。 1100℃。

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