Study of K‐Feldspar and Lime Hydrothermal Reaction at 190 °C: Phase, Kinetics and Mechanism with Reaction Time,ChemistrySelect

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Study of K‐Feldspar and Lime Hydrothermal Reaction at 190 °C: Phase, Kinetics and Mechanism with Reaction Time
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-12-07 , DOI: 10.1002/slct.201802763
Shanke Liu _{1,

2} , Cheng Han _{1,

2} , Jianming Liu _{1,

2}

Affiliation

An artificial silicate composite material prepared by the hydrothermal reaction of K‐feldspar and lime, showed excellent performance in remediating the soil. To elucidate the physicochemical properties of the artificial silicate composite material, K‐feldspar and lime were reacted in mild hydrothermal conditions (T=190 °C; P∼12.4 atm; t=0∼36 h). The hydrothermal product was systematically investigated using various techniques such as X‐ray powder diffraction (XRPD), scanning electron microscopy, and inductively coupled plasma‐optical emission spectrometry (ICP–OES). Quantitative evaluation of the extent of reaction by ICP–OES and XRPD methods enabled the analysis of hydrothermal evolution with prolonged time. The hydrothermal treatment of K‐feldspar with lime exhibits complex product phases, including leftover K‐feldspar, calcium hydroxide, calcite, grossular, tobermorite, alpha‐dicalcium silicate hydrate, potassium carbonate, bütschliite, and amorphous calcium silicate hydrate. The analysis of the reaction reveals that the K‐feldspar dissolution showed a clear transition, with the hydrothermal reaction beginning to slow down after 20 h. The slowdown of the K‐feldspar dissolution was essentially caused by different reaction kinetics and mechanisms before and after 20 h. The study yields vital and valuable insights into comprehending the chemistry and mineralogy of the artificial silicate composite material and producing a multielement reservoir from potassium‐rich rocks.

中文翻译：

钾长石与石灰在190°C水热反应的研究：相，动力学和反应时间机理

通过钾长石与石灰的水热反应制备的人造硅酸盐复合材料在修复土壤方面表现出优异的性能。为了阐明所述人造硅酸盐复合材料的物理化学性质，钾长石和石灰在温和的水热条件（进行反应Ť ; = 190℃ P ~12.4大气压;吨＝ 0〜36小时）。使用各种技术（例如X射线粉末衍射（XRPD），扫描电子显微镜和电感耦合等离子体发射光谱法（ICP-OES））对水热产物进行了系统地研究。通过ICP-OES和XRPD方法对反应程度的定量评估，使分析水热演化的时间得以延长。用石灰对钾长石进行水热处理显示出复杂的产物相，包括剩余的钾长石，氢氧化钙，方解石，块状，水辉石，α-硅酸二钙水合物，碳酸钾，水钠铝石和无定形硅酸钙水合物。反应分析表明，钾长石溶解表现出明显的过渡，水热反应在20小时后开始减慢。钾长石溶解的减慢主要是由20 h之前和之后的不同反应动力学和机理引起的。这项研究为理解人造硅酸盐复合材料的化学和矿物学以及从富含钾的岩石中生产多元素储层提供了重要而宝贵的见解。

更新日期：2018-12-07

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