氟橡胶复合材料在不同浓度硝酸溶液中的腐蚀行为

研究了80℃时氟橡胶/硫酸钡复合材料在不同质量分数的硝酸溶液中的腐蚀情况。通过测试试样浸泡在硝酸溶液前后的质量变化,对质量变化与时间拟和求导,计算出腐蚀速率,其结果表明腐蚀速率随硝酸溶液质量分数的增大和时间的延长而增大,质量分数的变化改变了腐蚀速率,但对腐蚀机理基本没有影响;根据扫描电子显微镜、X射线色散能谱、相对交联密度、红外光谱等测试分析了腐蚀机理:氟橡胶在热酸环境中大分子链脱氟化氢,交联点(-C=N键)处发生水解反应,交联网络被严重破坏,引入了含氧基团。

Recovery of Copper from Copper Sulfide Concentrate by Sulfation Roasting

Sulfation roasting was studied to extract copper from the copper sulfide concentrate. Sodium sulfite was added as sulfation agent to the copper sulfide concentrate during roasting in this study. Sulfur removal rate at different roasting temperatures was investigated, and the effects of roasting temperature, roasting time, and the amount of sodium sulfite on copper extraction were studied. Copper extraction higher than 96% was achieved at optimum roasting conditions.