Hydrothermal decomposition of K-feldspar in KOH-NaOH-H2O medium

doi:10.1016/j.hydromet.2015.05.014

CORC > 北京大学 > 地球与空间科学学院

	Hydrothermal decomposition of K-feldspar in KOH-NaOH-H2O medium
	Su, Shuangqing ; Ma, Hongwen ; Chuan, Xiuyun
刊名	HYDROMETALLURGY
	2015
关键词	K-feldspar Kalsilite Hydroxyl-cancrinite Decomposition INTERFACIAL DISSOLUTION-REPRECIPITATION WEATHERED FELDSPAR MECHANISM CHEMISTRY KALSILITE ZEOLITES MINERALS SURFACES POWDER QUARTZ
DOI	10.1016/j.hydromet.2015.05.014
英文摘要	The hydrothermal decomposition of K-feldspar in mixed alkaline solutions containing NaOH and KOH at a concentration of 8.5 M was studied. As the mole fraction of KOH (chi(KOH) = KOH/(KOH + NaOH) in mole) in the mixed alkaline solution decreased, metastable kalsilite, kalsilite and hydroxyl-cancrinite crystallized progressively at 240 degrees C. The metastable kalsilite disappeared when reaction temperature increased from 240 degrees C to 280 degrees C, while the crystallization zone of kalsilite was extended from chi(KOH) = 0.8-03 to chi(KOH) = 1.0-0.4, and the crystallization zone of hydroxyl-cancrinite was enlarged from chi(KOH) = 0 to chi(KOH) = 0.2-0. The K-feldspar dissolved under the action of OH- and released K+, Al(OH)(4)(-) and H2SiO42-. The kalsilite or hydroxyl-cancrinite was precipitated from solution. (C) 2015 Elsevier B.V. All rights reserved.; National Key Technologies Research and Development Program [2006BAD10B04]; Blue Sky Technology Corporation [2010110020000889]; SCI(E); EI; ARTICLE; mahw@cugb.edu.cn; 47-52; 156
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/418633]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Su, Shuangqing,Ma, Hongwen,Chuan, Xiuyun. Hydrothermal decomposition of K-feldspar in KOH-NaOH-H2O medium[J]. HYDROMETALLURGY,2015.
APA	Su, Shuangqing,Ma, Hongwen,&Chuan, Xiuyun.(2015).Hydrothermal decomposition of K-feldspar in KOH-NaOH-H2O medium.HYDROMETALLURGY.
MLA	Su, Shuangqing,et al."Hydrothermal decomposition of K-feldspar in KOH-NaOH-H2O medium".HYDROMETALLURGY (2015).