Preparation of potassium sulfate and zeolite NaA from K-feldspar by a   novel hydrothermal process

doi:10.1016/j.minpro.2016.08.017

CORC > 北京大学 > 地球与空间科学学院

	Preparation of potassium sulfate and zeolite NaA from K-feldspar by a novel hydrothermal process
	Su, Shuangqing ; Ma, Hongwen ; Chuan, Xiuyun ; Cai, Biya
刊名	INTERNATIONAL JOURNAL OF MINERAL PROCESSING
	2016
关键词	K-feldspar Potassium sulfate Zeolite NaA Hydrothermal process COAL FLY-ASH TEMPERATURE CRYSTALLINE EXTRACTION KAOLINITE KALSILITE TIME PURE 4A
DOI	10.1016/j.minpro.2016.08.017
英文摘要	This paper describes a novel hydrothermal method for preparing potassium sulfate and zeolite NaA from K-feldspar ore. The 3-step process involves the hydrothermal decomposition of K-feldspar, the preparation of potassium sulfate from kalsilite, and the synthesis of zeolite NaA from alumina-silica residue. K-feldspar transformed into kalsilite in a KOH solution at 280 degrees C. K2O was extracted from kalsilite at a rate of 95.73% by using H2SO4 (5.5 wt.%) and kalsilite at a mass ratio of 6.26 and a temperature of 60 degrees C for 4 h. Subsequently, agricultural grade potassium sulfate was crystallized by direct evaporation of the resulting K2SO4 solution. The CEC value of zeolite NaA produced from the alumina-silica residue was 168 mg CaO/g, making it a suitable substitute for conventional phosphatic washing builders. The method is a simple, clean and energy-efficient method for the utilization of K-feldspar ores. (C) 2016 Elsevier B.V. All rights reserved.; National Key Technologies Research and Development Program for 11th Five-year Plan [2006BAD10B04]; China Postdoctoral Science Foundation [2015M580915]; Blue-sky Technology Corporation [100000 RMB]; SCI(E); EI; ARTICLE; susq2012@126.com; 130-135; 155
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/450055]
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,et al. Preparation of potassium sulfate and zeolite NaA from K-feldspar by a novel hydrothermal process[J]. INTERNATIONAL JOURNAL OF MINERAL PROCESSING,2016.
APA	Su, Shuangqing,Ma, Hongwen,Chuan, Xiuyun,&Cai, Biya.(2016).Preparation of potassium sulfate and zeolite NaA from K-feldspar by a novel hydrothermal process.INTERNATIONAL JOURNAL OF MINERAL PROCESSING.
MLA	Su, Shuangqing,et al."Preparation of potassium sulfate and zeolite NaA from K-feldspar by a novel hydrothermal process".INTERNATIONAL JOURNAL OF MINERAL PROCESSING (2016).