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碳酸钙加速结晶规律的初步研究

发表时间:2008-08-31  浏览量:1492  下载量:565
全部作者: 王龙龙,栾兆坤,曲丹,张静波,韦斌,李翔,田春华
作者单位: 中国矿业大学(北京)化学与环境工程学院;中国科学院生态环境研究中心环境水质学国家重点实验室
摘 要: 针对反渗透(reverse osmosis, RO)浓水中的钙离子,考察了以碳酸钙、硫酸钙及石英砂为晶种的钙离子结晶过程。当硫酸钙加入处理液中发生了硫酸钙溶解现象,导致溶液钙离子浓度迅速增加,故硫酸钙不适合做低浓度盐水的晶种,而石英砂和碳酸钙均能对钙离子的结晶起到效果,但碳酸钙做晶种对钙离子的结晶更快捷、更彻底,在条件允许的情况下,采用碳酸钙做晶种为宜。用碳酸钙做晶种,通过加碱调节溶液pH值,考察了不同pH、不同晶种及其投加量、不同搅拌速度下钙离子的结晶过程,确定了pH值是影响钙离子结晶的主要因素,而搅拌速度、晶种及其投加量在一定程度上亦对钙离子结晶有影响。
关 键 词: 水体环境学;碳酸钙;加速结晶;晶种
Title: A preliminary study on accelerated precipitation softening of calcium carbonate
Author: WANG Longlong, LUAN Zhaokun, QU Dan, ZHANG Jingbo, WEI Bin, LI Xiang, TIAN Chunhua
Organization: School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing);State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences
Abstract: This paper concerned calcium ion in reverse osmosis (RO) concentration water. The process of calcium ion crystallization which uses the calcium carbonate, calcium sulfate and quartz sand as seed crystals was studied. The calcium sulfate was dissolved and led to the rapid increase of calcium ion concentration in the solution. So the calcium sulfate is not suitable for being seed crystal of low-salt concentration. The quartz sand and calcium carbonate both can be used as seed crystals, but it is much faster and more complete to use calcium carbonate as seed crystal compared with using quartz sand. If conditions allow, it is better to use calcium carbonate. Using calcium carbonate as seed crystal, adjusting pH values of solution by alkali, the process of the crystallization of calcium ion in reverse osmosis water under different pH values, seeds and their dosage, also different mixing speeds was examined. The result shows that the pH value is the key factor of crystallization of calcium ion, the mixing speed, seed crystal and its dosage also affect the crystallization of calcium to a certain extent.
Key words: water environmentology; calcium carbonate; accelerated precipitation softening; seed crystal
发表期数: 2008年12月第16期
引用格式: 王龙龙,栾兆坤,曲丹,等. 碳酸钙加速结晶规律的初步研究[J]. 中国科技论文在线精品论文,2008,1(16):1856-1859.
 
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