研究了粘土负载 K2 Fe O4缓释剂制备、水溶出特性和 Fe(OH) 3 对 Fe O2 -4水解反应的催化作用。考察了温度、总吸收量和存放时间等对缓释剂中 Fe O2 -4水溶出的影响。结果表明 ,该缓释剂能使 Fe O2 -4在水中缓慢溶出、浸出液稳定性高 ,...研究了粘土负载 K2 Fe O4缓释剂制备、水溶出特性和 Fe(OH) 3 对 Fe O2 -4水解反应的催化作用。考察了温度、总吸收量和存放时间等对缓释剂中 Fe O2 -4水溶出的影响。结果表明 ,该缓释剂能使 Fe O2 -4在水中缓慢溶出、浸出液稳定性高 ,制剂在水中长时间浸泡仍保持高强度。这些特性为 K2 Fe展开更多
Digesting aluminum-bearing minerals and converting ferric oxide to magnetite simultaneously in Bayer digestion process is crucially important to deal with high-iron diasporic bauxite economically for alumina productio...Digesting aluminum-bearing minerals and converting ferric oxide to magnetite simultaneously in Bayer digestion process is crucially important to deal with high-iron diasporic bauxite economically for alumina production.The reaction behaviors of hydrothermal reduction of ferric oxide in alkali solution were studied by both thermodynamic calculation and experimental investigation.The thermodynamic calculation indicates that Fe3O4 can be formed by the conversion of Fe2O3 at proper redox potentials in alkaline solution.The experimental results show that the formation ratio of Fe3O4 either through the reaction of Fe and Fe2O3 or through the reaction of Fe and H2O in alkaline aqueous solution increases remarkably with raising the temperature and alkali concentration,suggesting that Fe（OH）3- and Fe（OH）4- form by dissolving Fe and Fe2O3,respectively,in alkaline aqueous solution and further react to form Fe3O4.Moreover,aluminate ions have little influence on the hydrothermal reduction of Fe2O3 in alkaline aqueous solution,and converting iron minerals to magnetite can be realized in the Bayer digestion process of diasporic bauxite.展开更多
离子交换树脂的清洗特性是评价树脂品质的重要指标之一。本文提出了树脂清洗特性的试验及评价方法:用总体积为5 BV的除盐水以(1.5±0.1) m L/(cm^2·min)的淋洗强度淋洗200 mL树脂试样,连续监测淋洗流出液的电导率,收集所有的...离子交换树脂的清洗特性是评价树脂品质的重要指标之一。本文提出了树脂清洗特性的试验及评价方法:用总体积为5 BV的除盐水以(1.5±0.1) m L/(cm^2·min)的淋洗强度淋洗200 mL树脂试样,连续监测淋洗流出液的电导率,收集所有的淋洗流出液;以淋洗动力学常数及床容积5 BV淋洗点电导率,表征树脂清洗的难易程度,以淋洗流出总液的电导率、总有机碳(TOC)或紫外吸光值(UV(254))表征树脂溶出物的总量;通过树脂淋洗流出总液的UV-Vis谱图与TOC的关联分析,可反映树脂溶出物种类的差异。该方法可为新树脂的选型和树脂的验收提供参考。展开更多
文摘研究了粘土负载 K2 Fe O4缓释剂制备、水溶出特性和 Fe(OH) 3 对 Fe O2 -4水解反应的催化作用。考察了温度、总吸收量和存放时间等对缓释剂中 Fe O2 -4水溶出的影响。结果表明 ,该缓释剂能使 Fe O2 -4在水中缓慢溶出、浸出液稳定性高 ,制剂在水中长时间浸泡仍保持高强度。这些特性为 K2 Fe
基金Project(51374239)supported by the National Natural Science Foundation of China
文摘Digesting aluminum-bearing minerals and converting ferric oxide to magnetite simultaneously in Bayer digestion process is crucially important to deal with high-iron diasporic bauxite economically for alumina production.The reaction behaviors of hydrothermal reduction of ferric oxide in alkali solution were studied by both thermodynamic calculation and experimental investigation.The thermodynamic calculation indicates that Fe3O4 can be formed by the conversion of Fe2O3 at proper redox potentials in alkaline solution.The experimental results show that the formation ratio of Fe3O4 either through the reaction of Fe and Fe2O3 or through the reaction of Fe and H2O in alkaline aqueous solution increases remarkably with raising the temperature and alkali concentration,suggesting that Fe（OH）3- and Fe（OH）4- form by dissolving Fe and Fe2O3,respectively,in alkaline aqueous solution and further react to form Fe3O4.Moreover,aluminate ions have little influence on the hydrothermal reduction of Fe2O3 in alkaline aqueous solution,and converting iron minerals to magnetite can be realized in the Bayer digestion process of diasporic bauxite.
