从赤泥、粉煤灰中提取氧化铝实验研究

通过单因素分析和稳定性实验,本文时从赤泥、粉煤灰中提取氧化铝的粉煤灰和烧碱质量比、赤泥和粉煤灰质量比、原料的煅烧温度、煅烧时间等工艺条件进行了实验研究。     

Microwave-assisted rapid synthesis of alumina nanoparticles using tea,coffee and triphala extracts

Alumina nanoparticles （A1NP） were synthe- sized from aluminium nitrate using extracts of tea, coffee and triphala--a well known herbal plant as well as a non- toxic and eco--friendly green material. The synthesis was carried out taking 1：4 ratio of metal salt and these extracts under microwave irradiations at 540 W, which gave better yield of nanoparticles. Water was taken as solvent medium. The formations of A1NP were initially monitored by the colour changes occurring in the reaction mixture during the incubation period. As synthesized nanoparticles were characterized by scanning electron microscope （SEM）, UV-Visible （UV-Vis） spectroscopy and Fourier transform infrared spectroscopy （FTIR）. The A1NP were found to be spherical in shape in case of tea and coffee extracts with a size of 50-200 nm and to be oval shaped in case of triphala extract with an average size of 200-400 nm. The formation of A1NP with the microwave-assistance using these plant extracts has proved to be very faster than any other methods. In addition, excellent reproducibility of these nanoparticles, without the use of any additional capping agent or stabilizer will have great advantages in compari- son with microbial synthesis, avoiding all the tedious and hygienic complications.     

载氟氧化铝中氟含量的测定

研究载氟氧化铝中氟含量的测定方法,采用氟离子选择电极在PH为6～7的总离子强度调节缓冲溶液介质中,氟离子浓度在0.475～4.75ug/ml之间呈现良好线性关系,方法灵敏性和选择性较好,回收率在96.8%～101.6%之间.能够很好的应用于载氟氧化铝中氟含量的测定.     

以废治废新工艺解世界环保难题

石油、石化行业含油废水的处理是一个世界性的环保难题。传统废水处理多采用核桃壳、石英砂、无烟煤和纤维素作为过滤介质。武汉理工大学科研人员独辟蹊径,采用氧化铝工业的废弃物赤泥制成多孔陶瓷滤料,利用其亲油性和疏油性,取得了良好的处理效果。目前,参与鉴定的专家们认为,该项成果达到了国际先进水平。     

中和滴定法测定氧化铝富矿熟料中的Na2O

试验了以热水溶出、以中和滴定法测定熟料中氧化钠含量的快速分析方法.结果表明,该方法与重量法结果相吻合,分析速度较重量法提高近8倍,操作手续简便,结果重现性较好.     

煤矸石的利用

煤矸石在煤矿是相当普遍的，一般作为废料堆放，这样不但占用大量土地，还污染环境。介绍了用煤矸石制备结晶氯化铝、碱式氯化铝、亚微米级氧化铝及纳米级氧化铝的工艺流程和技术要点。     

MgO引发剂对铝合金原位氧化生长的影响

通过热重分析实验,研究了在高温空气气氛中覆盖在Al-Zn—Si合金表面的MgO引发剂对铝合金直接氧化生长过程的作用。结果表明：MgO能显著缩短Al-Zn—Si合金熔体直接氧化所需的孕育期及Al2O3／Al复合材料的生长时间。同时发现MgO有助于Al2O3／Al复合材料以光滑的方式进行氧化生长,形成细化胞状晶团,提高组织结构的均匀度和材料的致密度。促进Al2O3／Al复合材料生长的MgO覆盖最佳量为12mg／cm^2。     

铝电解槽提高电流效率的探讨

本文分析了影响电解槽电流效率的几个主要原因，并结合现代大型预焙槽生产工艺探讨了提高电流效率的主要途径。