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硅酸盐自应力水泥中三氧化硫含量,一般采用两次静态离子交换法测定。但该法的树脂耗量较大,这对于树脂的处理与再生条件尚差、每隔半小时又须测控SO_3的生产单位,易发生因再生树脂的断供而贻误生产。而且树脂再生处理频繁,不但费时、费工、费料,还会因此降低树脂的离子交换能力(离子交换率)而直接影响测定结果的准确度。针对上述矛盾,笔者通过科学分析及反复试验发现:由于SO_3测样的母液,在首次离子交换后,已将溶液中经水化产生的非钙金属阳离子(包括Fe~(3+)、Al~(3+)、Mg~(2+)……等离子)及大部分钙离子基本上已予以交换去除,转变为以钙为主型树脂及氢离子(该氢离子
The sulfur trioxide content of silicate self-stressing cement is generally determined by two static ion exchange methods. However, the resin consumption of this method is relatively large. This is a case where the processing and regeneration conditions of the resin are still poor, and the production unit for monitoring and control of SO3 must be measured every half hour, which is prone to delay production due to the broken supply of recycled resin. Moreover, the regeneration of the resin is frequent, which not only takes time, labor, and materials, but also reduces the ion exchange capacity (ion exchange rate) of the resin and directly affects the accuracy of the measurement result. In view of the above contradictions, the author found through scientific analysis and repeated trials that due to the mother liquor of the SO 3 sample, after the first ion exchange, the non-calcium metal cations (including Fe 3+ ) and Al 3 that have been hydrated in the solution have been produced. The (3+), Mg~(2+),..., and most of the calcium ions have been exchanged and removed, and converted to calcium-based resins and hydrogen ions.