磷酸氢钙反应是制备磷酸盐产品的重要工艺步骤之一。MER值(Magnesium to Extractable Phosphorus Ratio)作为一个衡量磷酸氢钙反应过程中杂质含量的指标,对反应过程的影响引起了广泛的关注。通过研究液相中的反应物扩散过程、杂质产物...磷酸氢钙反应是制备磷酸盐产品的重要工艺步骤之一。MER值(Magnesium to Extractable Phosphorus Ratio)作为一个衡量磷酸氢钙反应过程中杂质含量的指标,对反应过程的影响引起了广泛的关注。通过研究液相中的反应物扩散过程、杂质产物对固体膜和液体膜的影响、磷酸电离与氢离子活度变化的关系以及镁离子对反应速率和能耗的影响,探讨了MER值对磷酸氢钙反应过程的影响机制。实验结果表明,较高的MER值会导致反应物扩散受阻、杂质产物影响反应进行、磷酸电离减弱以及反应速率降低。因此,在工业生产中,需要控制和优化MER值,以提高反应过程的效果和产物的纯度。这些研究结果对于磷酸氢钙反应的工艺改进和优化具有重要的指导意义。展开更多
Xinjiang is located in the core China’s‘Belt and Road’development,and northern Xinjiang is an important region for economic development.In recent years,due to the strong influence of global climate change and human...Xinjiang is located in the core China’s‘Belt and Road’development,and northern Xinjiang is an important region for economic development.In recent years,due to the strong influence of global climate change and human disturbance,regional climate instability and ecological-economic-social system sensitivity have grown.In this paper,seasonal,interannual,interdecadal,spatial,abrupt,and periodic variations of temperature and precipitation in northern Xinjiang were analyzed using daily surface air temperature and precipitation data from 49 meteorological stations during 1961–2017.At the same time,the driving factors of climate change are discussed.Methods included linear regression,cumulative anomaly,the Mann-Kendall test,and Morlet wavelet analysis.The results indicated that during the study period,annual mean temperature and annual precipitation increased significantly at rates of 0.35℃/10 yr and 13.25 mm/10 yr,respectively,with abrupt changes occurring in 1994 and 1986.Annual mean temperature and annual precipitation in all four seasons showed increasing trends,with the maximum increases in winter of 0.42℃/10 yr and 3.95 mm/10 yr,respectively.The general climate in northern Xinjiang showed a trend towards increasingly warm and humid.In terms of spatial distribution,the temperature and precipitation in high mountainous areas increased the most,while basins areas increased only slightly.Periodic change analysis showed that annual mean temperature and annual precipitation experienced two climatic shifts from cold to warm and dry to wet,respectively.Population change,economic development and land use change are important factors affecting climate change,and more research should be done in this field.展开更多
文摘磷酸氢钙反应是制备磷酸盐产品的重要工艺步骤之一。MER值(Magnesium to Extractable Phosphorus Ratio)作为一个衡量磷酸氢钙反应过程中杂质含量的指标,对反应过程的影响引起了广泛的关注。通过研究液相中的反应物扩散过程、杂质产物对固体膜和液体膜的影响、磷酸电离与氢离子活度变化的关系以及镁离子对反应速率和能耗的影响,探讨了MER值对磷酸氢钙反应过程的影响机制。实验结果表明,较高的MER值会导致反应物扩散受阻、杂质产物影响反应进行、磷酸电离减弱以及反应速率降低。因此,在工业生产中,需要控制和优化MER值,以提高反应过程的效果和产物的纯度。这些研究结果对于磷酸氢钙反应的工艺改进和优化具有重要的指导意义。
基金Under the auspices of the National Key Research and Development Program of China(No.2017YFC0405101)National Natural Science Foundation of China(No.91647103).
文摘Xinjiang is located in the core China’s‘Belt and Road’development,and northern Xinjiang is an important region for economic development.In recent years,due to the strong influence of global climate change and human disturbance,regional climate instability and ecological-economic-social system sensitivity have grown.In this paper,seasonal,interannual,interdecadal,spatial,abrupt,and periodic variations of temperature and precipitation in northern Xinjiang were analyzed using daily surface air temperature and precipitation data from 49 meteorological stations during 1961–2017.At the same time,the driving factors of climate change are discussed.Methods included linear regression,cumulative anomaly,the Mann-Kendall test,and Morlet wavelet analysis.The results indicated that during the study period,annual mean temperature and annual precipitation increased significantly at rates of 0.35℃/10 yr and 13.25 mm/10 yr,respectively,with abrupt changes occurring in 1994 and 1986.Annual mean temperature and annual precipitation in all four seasons showed increasing trends,with the maximum increases in winter of 0.42℃/10 yr and 3.95 mm/10 yr,respectively.The general climate in northern Xinjiang showed a trend towards increasingly warm and humid.In terms of spatial distribution,the temperature and precipitation in high mountainous areas increased the most,while basins areas increased only slightly.Periodic change analysis showed that annual mean temperature and annual precipitation experienced two climatic shifts from cold to warm and dry to wet,respectively.Population change,economic development and land use change are important factors affecting climate change,and more research should be done in this field.
