摘要
高纯氢氧化镁性能优越,用途广泛,但工业氢氧化镁常含杂质,影响其应用性能。为此,文章以含钡盐(氯化钡和硫酸钡)杂质的工业氢氧化镁(纯度97.0%)为原料,探索了采用EDTA络合除杂制备高纯氢氧化镁的工艺规律,考查了温度、EDTA浓度及pH值对除钡效率的影响,通过热力学计算初步分析了EDTA作用机制。研究结果表明:EDTA浓度越高,络合除钡率越高,在pH值12~13、60℃-70℃条件下除钡率可达80%以上,获得纯度高达99%的高纯氢氧化镁产物。
Magnesium hydroxide (Mg (OH)2) with high purity is widely used in various fields owing to its unique properties, while the impurities in the industrial Mg(OH) 2 products usu- ally limited their practical applications. The fabrication of Mg ( OH ) 2 with high purity from Mg (OH) 2 containing Ba( BaC12 and BaSQ ) via EDTA complex method was studied in this paper. The influences of temperature, EDTA and pH on the removal of Ba - bearing impurities were studied. The experimental results indicated that the increase of EDTA favored the removal of Ba - bearing impurities form Mg(OH) 2. 80% of Ba was removed and Mg(OH) 2 with a purity of 99% was fabri- cated at pH 12 - 13 and 60℃ -70℃.
出处
《盐业与化工》
CAS
2014年第3期16-19,共4页
Jounral of Salt and Chemical Industry
基金
国家自然科学基金(NO.51374138)
国家高技术研究发展计划(NO.2012AA061602)
关键词
氢氧化镁
钡杂质
EDTA
除杂
Mg(OH)2
Ba-bearing impurities
EDTA
removal of impurities