Fundamental research on CO2 mineralization:
I. Leaching kinetics of forsterite and serpentine with hydrochloric acid
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摘要: 对盐酸浸取镁橄榄石和蛇纹石的过程进行了研究，考察了酸浓度、浸取温度对镁浸出率的影响。结果表明，提高酸浓度和浸取反应温度能够提高镁橄榄石和蛇纹石中镁的浸出率。采用单粒级矿物原料浸出实验获得的动力学数据，利用收缩核模型分析了橄榄石和蛇纹石的镁浸出过程动力学，镁橄榄石浸出动力学属表面化学反应控制，而蛇纹石浸出反应为产物层扩散控制。两种矿物结构的差异影响镁浸出的难易程度，也决定了不同的浸出动力学行为。Abstract: The leaching of forsterite and serpentine was investigated and the effects of hydrochloric acid concentration and temperature were examined. Magnesium dissolution extent increases with the increase of hydrochloric acid concentration and temperature. The reactivity of forsterite is relative higher than that of serpentine. Furthermore, a modified unreacted shrinking core model was used to determine the dissolution kinetic parameters. The dissolution of forsterite is controlled by the surface reaction control. However, the serpentine dissolution is controlled by the product layer diffusion. The difference of dissolution extent and kinetics of two minerals depend on the structure and silica polymerization extent.
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Key words:
- CO2 mineralization /
- forsterite /
- serpentine /
- dissolution /
- model
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