Production of Complex Fine Powders Using Solvent Extraction and Evaluation of the Powders

溶剂萃取的汽提阶段可用于生产金属盐、金属氧化物、金属粉末和复合金属粉末。这被称为结晶剥离。在结晶-剥离中，以简单的方法较低成本地制备复杂的金属和金属氧化物细粉末。将两种或三种含有不同金属离子的有机相混合在一起，对有机相进行结晶反萃，可以制得复杂的金属和金属氧化物细粉。以叔碳酸和D2 EHPA为萃取剂，研究了Co、Ag、Ni、Cu、Zn、Fe和Sm的萃取，然后是结晶的性质用草酸和二氧化碳作结晶剂，测定了这些金属离子的溶出，这些金属的结晶在5由于金属碳酸盐的低溶解度，用含两种金属离子的有机相进行结晶时-Sr ...更多信息 倾斜时，结晶按照与萃取剂具有较弱亲和力的金属离子的顺序发生。如果使用与有机相中金属浓度相应的草酸量，则所有的金属离子都以络合物形式从有机相中沉淀出来。在这种情况下，每种金属草酸盐，如铜、镍和锌的草酸盐的颗粒尺寸彼此不同。例如，发现铜、镍和锌的重铬酸盐的颗粒尺寸分别为0.5、2.5和5 μ m。水溶液中的沉降速度取决于粒径。由于粒度差异的原因，不能产生混合状态良好的络合金属草酸盐。这些金属氧化物的热分解发生在300-400 ℃的温度范围内。在空气中的热分解产生金属氧化物粉末，而在氢气中的分解产生还原的金属粉末。对含银和镍的有机相进行二氧化碳反萃结晶，可得到混合状态良好的复合金属碳酸盐。少

The stripping stage of solvent extraction can be applied for the production of metal salts, metal oxide, metal powders and complex metal powders. It is called the crystallization-stripping. In the crystallization-stripping, the complex fine metal and metal oxide powders are prepared less costly in the simple process. If two or three kinds of organic phases containing different metal ions are mixed together and the crystallization-stripping is applied to the organic phase, we can make complex fine metal and metal oxide powders.Extraction of Co, Ag, Ni, Cu, Zn, Fe and Sm were investigated using Versatic Acid and D2EHPA as extractants, and then the properties of crystallization-stripping of these metal ions were measured using oxalic acid and carbon dioxide as crystallization agents.The crystallization of these metals takes place quantitatively within 5 min.due to the low solubility of metal oxalates. When the organic phase containing two kinds of metal ions is used for crystallization-sr … More tipping, the crystallization happens in the order of metal ions which have less strong affinity with the extractant. If the amount of oxalic acid corres-ponding to metal concentration in the organic phase is used, all of metal ions are precipitated as copmlex metal oxalates from the organic phase. In this case, the particle size of each metal oxalate, such as copper, nickel and zinc oxalates is different from one to other oxalates. For example, the particle size of copper, nickel and zinc oxalates is found to be 0.5,2.5 and 5mum, respectively. The sedimentation speed in aqueous solution depends on the particle size. The complex metal oxalate with good mixed state cannot be produced by the reason of particle size difference. The thermal decomposition of these metal oxalates takes place in the temperature range, 300-400ﾟC.The thermal decomposition in air gives the metal oxide powders, while the decomposition in hydrogen results in reduced metal powder. When the crystallization-stripping with carbon dioxide is applied to the organic phase containing silver and nickel, the complex metal carbonate with good mixed state can be obtained. Less