2014年吉安县早稻石灰用量试验总结

我县的水田绝大部分是由红色壤土发育而成,属酸性土壤。为了调节土壤的p H值,提高水稻根系所处的最佳环境,增强水稻秧苗的吸肥、吸水能力,加快早稻的分蘖,促使早稻尽早搭好丰产苗架。同时也为了检验施用石灰防酸化技术在稻田的应用效果,研究出不同施肥水平下进行酸化防治的适宜石灰用量,为全面开展"一斤石灰一斤粮"增产行动提供技术指导依据。1本次试验的地点和供试品种本次试验安排在我县的凤凰镇车头村委杨家坊小组实施。供     

Influence of earth gravity on reaction engineering of tubular reactor for high concentration tungsten ion-exchange

The influence of gravity on the reaction engineering of tubular reactor is studied by analyzing the residence time distribution curves.The results show that upflow-feeding mode is more beneficial compared with downflow-feeding mode,since the flow pattern of the fluid in the reactor is closer to plug flow.The result of dynamic experiment conducted in ion-exchange of tungsten metallurgy is as good as that in reaction engineering of ion-exchange column.Whether downflow-feeding or upflow-feeding mode is adopted,breakthrough time decreases when solution concentration increases.Upflow-feeding mode has longer breakthrough time and greater improvement in adsorption capacity especially with high WO3 concentration in ion-exchange.     

新农药防治水稻螟虫试验总结

通过凯强(凯源祥化工)5%甲维盐;锐腾(威远化工)阿维菌素·氟灵脲等新农药防治水稻螟虫试验,为评价凯强和锐腾对水稻螟虫的防治效果及其安全性等,为大面积推广提供科学依据。     

钨钼冶炼过程中除钒

针对钨钼冶炼过程中钒难以深度除去的难题,借鉴海洋化学研究中的元素迁移规律,研究采用高价水合氧化物从钨钼冶炼过程中除钒。结果表明:从钨酸钠溶液中除钒,当铁盐添加量按Fe与V摩尔比为40、溶液pH值为8.5~9.0时,除钒率均能达到99%以上。而在相同条件下,当采用水合铝氧化物和锰氧化物作为除钒剂时,除钒率分别只能达到90%和60%,除钒效果明显不及采用铁盐时的。另外,用于在钼酸钠溶液除钒,当铁盐添加量按Fe与V摩尔比为40、溶液pH值7.5~10.8时,除钒率可达到97%,钼损失率小于5%。而在钼酸铵溶液中,当铁盐添加量按Fe与V摩尔比为10、溶液pH为8.6~9.0时,除钒率在96%以上,同时几乎没有钼损失;当铁盐添加量按Fe与V摩尔比增加到20时,除钒率均高于97%,钼损失率也小于2%。在钨钼冶炼过程中,铁盐可以作为一种有效的除钒试剂。