矿产保护与利用Issue(6)：87-92,96,7.DOI:10.13779/j.cnki.issn1001-0076.2017.06.016
大长径比硫酸钙晶须的制备及形貌研究
Study on the Preparation and Morphology of Large Aspect Ratio Calcium Sulfate Whisker
摘要
Abstract
Natural gypsum was used as raw material in airtight reactor to prepare hemihydrate calci-um sulfate whiskers by hydrothermal method, and SEM was utilized to observe the morphology and aspect ratio.The additive, particle size, hydrothermal temperature, pH, initial slurry concentration and hydrothermal time on the morphology of calcium sulfate whisker were investigated.The results showed that additive increased the solubility of natural gypsum in solution;particle size of raw ma-terial affected the dissolution rate of natural gypsum, smaller particles easily reached the supersatu-rated sate;it's difficult to turn into calcium sulfate whisker when hydrothermal temperature was less than 100 ℃;pH of solution can change the mass fraction of ion, and as pH increased the average diameter of whisker gradually decreased, along with being invalid of the additive of CuCl2; the higher slurry concentration was, the smaller the space of whisker growth was and the slower ion transport rate was.The optimum conditions for the preparation were as follows:the diameter of raw material was 4 μm with the slurry concentration at 5%, the content of copper chloride was 1.5%,temperature was 120℃, pH=5.3, and reaction time was 140 minutes.Then, the calcium sulfate whisker of average diameter 1~2 μm, aspect ratio 160 were obtained.关键词
天然石膏/水热法/硫酸钙晶须Key words
natural gypsum/hydrothermal/calcium sulfate whisker分类
化学化工引用本文复制引用
梁现红,谭琦,张传祥,段玉玲..大长径比硫酸钙晶须的制备及形貌研究[J].矿产保护与利用,2017,(6):87-92,96,7.基金项目
国家自然科学基金(51404219) （51404219）
中国地质调查局地质调查项目(121201017000160907) （121201017000160907）
