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阐述了用湿法冶金加压氢还原技术制取微细镍粉(0.2—1.0μm)的方法。该法以工业碱式碳酸镍为原料,水为制浆介质,直接进行浆料氢还原。在配制浆料时加入一定量的硫酸,以保证溶液中有足够的初始镍离子浓度,并消除原料组成及原料pH值的波动带来的不稳定因素。同时加入催化剂,以增加固体表面的活性,以此作为缩短或消除反应诱导期的主要手段。并提出,在确定的镍离子还原初始浓度下,可通过控制固体表面的活性来达到控制产品粒度的目的。此外,还从镍颗粒的形貌试论了该还原反应的机理。
The method for producing fine nickel powder (0.2-1.0μm) by hydrometallurgical hydrogen reduction is described. The method takes industrial basic nickel carbonate as raw material and water as the pulping medium, and directly reduces the slurry hydrogen. In the preparation of slurry by adding a certain amount of sulfuric acid to ensure that the solution has sufficient initial nickel ion concentration, and eliminate the composition of raw materials and raw materials caused by fluctuations in pH instability factors. At the same time adding a catalyst to increase the activity of the solid surface, as the main means to shorten or eliminate the induction period. It is also proposed that the control of the particle size of the product can be achieved by controlling the activity of the solid surface at a defined initial concentration of nickel ion reduction. In addition, the mechanism of the reduction reaction is also discussed from the morphology of nickel particles.