Abstract : this paper describes a new preparation technique of calcium iodate . at the presence of hydrochloric acid , iodine is oxidated by sodium chlorate , and then reacts with calium hydroxide . a series of constrasted experiments are made on the conditions and different techniqures . relatively high productivity and purity at low cost . easy controllability and operation are the main features of this kind of technique 文摘:介绍了以单质碘为原料，在盐酸存在下，经氯酸钠氧化，再与氢氧化钙进行中和反应制备碘酸钙的方法，并做了最佳工艺条件和不同方法的对比实验.本法具有收率较高、纯度较高、生产成本较低及反应条件易控制、设备简单、操作方便等特点
The low solubility of calcium zincate produced from the chemical reaction of zinc oxide and calcium hydroxide in alkaline solution can improve the cycling life the zinc electrode , and the discharge capacity will tend to be stable . furthermore , the effects of la2o3 additives on the electrochemical performances of zinc electrodes were investigated . the results shows that the addition of la2o3 , in zinc electrode can improve the area of reduction peak and the hydrogen evolution potential which means the cathodic hydrogen evolution reaction can be hindered 氧化锌与氢氧化钙在碱性溶液中化学反应生成的难溶于碱的锌酸钙可以使锌电极的循环寿命得到提高，放电容量也趋于平稳，此外还考察了氧化镧对锌酸钙电极电化学性能的影响，结果表明：添加适量氧化镧能明显改善锌电极的电化学性能，使锌电极的还原峰电位正移，电极反应可逆性得到改善，同时也可抑制锌电极析氢反应的发生，提高了锌电极的阳极电流，对阳极反应有一定的活化作用；同时还可以改善锌电极的放电特性，增加电极的放电容量。
