pH值对硫酸钙晶须直径的影响3.PDF

____________________________________________________________________________ Series No. 340 金 　　属 　　矿 　　山 总第 340 期 October 　2004 　　　　　　　　　　　　　　 METAL MINE 　　　　　　　　　　　　　2004年第 10 期 pH 值对硫酸钙晶须直径的影响 王泽红 　乔景慧 　韩跃新 　印万忠 　袁致涛 (东北大学) 摘 　要 　以CaSO ·2H O 为原料 ,采用水热法合成了硫酸钙晶须 ;研究了料浆初始 pH 值对硫酸钙晶须直径的 4 2 影响规律。结果表明 ,随pH 值的增加 ,硫酸钙晶须的直径减小 ,当pH 为 10. 10 时 , 晶须直径最小 ,达到 230 nm , 以 后随 pH 值的增大晶须的直径基本保持不变。分析了料浆的初始 pH 值对硫酸钙晶须直径的影响机理 ,认为 pH 值 影响硫酸钙的溶解度 ,使溶液中的离子平衡发生变化 , 同时改变了杂质的活性 ,使杂质敏化或钝化 ,影响了晶须在 某一方向的生长趋势。 关键词 　水热法 　硫酸钙晶须 　pH 值 Effect of pH Value on Calcium Sulfate Whiskers Wang Zehong 　Qiao Jinghui 　Han Yuexin 　Yin Wanzhong 　Yuan Zhitao ( ) Northeastern University Abstract 　Hydrothermal method was used to prepare the calcium sulfate whiskers with CaSO ·2H O as raw material. The 4 2 effect of the initial pH value of the pulp on the diameter of the calcium sulfate whiskers was studied. The results showed that the diameter of calcium sulfate whiskers was reduced with the increase of pH value until the pH value reached 10. 10 , when the whish ers diameter was the smallest , being 230 nm. Then the diameter remained basically unchanged inspite the increase of pH value. The mechanism of the effect of the initial pulp pH value on the whisker diameter was analysed. It was concluded that pH value af fects the solubility of calcium sulfate , which leads to the change in ion equilibrium in the solution and in