Alkaline Hydrothermal Treatment and Leaching Kinetics of Silicon from Laterite Nickel Ore

Alkaline Hydrothermal Treatment and Leaching Kinetics of Silicon from Laterite Nickel Ore
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红土镍矿中硅的碱性水热处理及浸出动力学

DOI:
10.1007/s42461-021-00518-4
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发表时间:
2021-12
期刊:
Mining, Metallurgy & Exploration
影响因子:
--
通讯作者:
Chang Longjiao
Chang Longjiao
中科院分区:
其他
文献类型:
--
作者:
Chang Longjiao

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提出了以氢氧化钠为反应助剂,水热法提取红土镍矿中二氧化硅的新工艺。研究了红土镍矿碱水热处理过程中的矿物学转变和硅的提取动力学。采用收缩核模型研究了反应温度(175 ~ 250℃)、氢氧化钠与矿石的摩尔比(1.05 ~ 1.2:1)和红土镍矿粒度(44 ~ 178 μm)对二氧化硅萃取率的影响。结果表明,随着反应温度的升高、氢氧化钠与矿石物质的量比的增加、反应时间的延长和原矿粒度的减小,二氧化硅的萃取率增加。动力学分析表明,红土矿中二氧化硅的分离可用内扩散模型描述。反应的表观活化能Ea为8.87 kJ mol−1,建立了动力学模型。
A new process of extracting silica from laterite nickel ore by hydrothermal treatment with sodium hydroxide as reaction auxiliary agent was proposed. The mineralogical transformation and silicon extraction kinetics of laterite nickel ore in alkaline hydrothermal treatment were studied. The effects of reaction temperature (175 ~ 250℃), molar ratios of sodium hydroxide to ore (1.05 ~ 1.2:1), and laterite nickel ore particle size (44 ~ 178 μm) on the extraction ratio of silica were investigated by using the shrinking core model. The results show that the extraction ratio of silica increases with the increase of reaction temperature, sodium hydroxide to ore molar ratio, reaction time, and the decrease of raw ore particle size. The kinetic analysis shows that the separation of silica in laterite ore can be described by internal diffusion model. The apparent activation energy (Ea) of the reaction was 8.87 kJ mol−1, and the kinetic modeling was established.
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