Adsorption of organic phosphorus in pesticide wastewater by CaAI hydrotalcite

采用共沉淀法制备了CaAl水滑石（CaAl-LDH），并运用扫描电子显微镜（SEM）和热重／差示扫描量热分析（TG—DSC）技术对CaAl-LDH的形貌及热稳定性进行了表征。采用CaAl-LDH对含膦农药废水进行除膦吸附试验，探讨了搅拌时间、pH值、CaAl-LDH的加入量对吸附性能的影响。结果表明：当CaAl-LDH的加入量为80g／L，搅拌时间为3h，pH值为6—8时，CaAl-LDH对膦的吸附性最强，废水中膦质量分数仅为0．1×10^-6。CaAl hydrotalcite （CaAl-LDH） was prepared by coprecipitation method. The morphology and thermal stability of CaAl-LDH was characterized by scanning electron microscopy （SEM） and thermogravimetry/differential scanning calorimetry （TG - DSC ）. The test of phosphine adsorption removal by CaAl-LDH from phosphine pesticide wastewater was carried out. The results showed that when the addition amount of CaAl-LDH was 80 g/L, the stirring time was 3 h, and the pH value was from 6 to 8, CaAl-LDH had the strongest adsorption to phosphine, and the mass fraction of phosphine in wastewater was only 0.1× 10^-6

TiO_2-Al_2O_3-CaO-SiO_2低碱度高钛渣熔体黏度特性

研究了TiO2含量、Al2O3含量以及二元碱度(CaO/SiO2)对TiO2-Al2O3-CaO-SiO2低碱度高钛渣黏度的影响.实验采用旋转柱体法在1633~1873 K温度范围内对渣系熔体黏度进行了测量.当TiO2质量分数为23%~43%、Al2O3质量分数为3%~12%和二元碱度为0.3~0.7时,钛渣熔体黏度随TiO2含量和碱度的增加而降低,随Al2O3含量的增加而增加.通过对转底炉-电炉熔分过程渣系脱硫能力计算,得知在低碱度高钛渣中TiO2属于酸性.依据黏度测量数据和对TiO2属性的界定,通过修正Urbain模型建立了低碱度高钛渣的熔体黏度预报模型.模型预测结果误差为11%,证明新模型对于低碱度高钛渣的黏度具有良好的预报效果