摘要
针对硫酸镍液相通氢还原制得球状超细镍粉品位较低(仅在96%左右)的问题,提出一条通过火法-湿法联合还原提高镍粉品位的工艺路线。首先由硫酸镍和氢氧化钠水溶液在室温下混合而成氢氧化镍浆料,不经过过滤洗涤,转入高压釜进行悬浮态氢还原。反应结束后,液固分离,获得品位在96%左右的半成品镍粉。将半成品镍粉在氢还原炉中进行二次还原,控制还原温度为400℃,还原时间为2 h,获得的产品镍质量分数大于99.5%,粒度小于2.0μm,满足金刚石工具、硬质合金等行业需求的超细镍粉性能指标要求。
In allusion to the problem that the grade of ultrafine spherical Ni powder was very low （only about 96% ） prepared from nickel sulfate by liquid hydrogen reduction process, a combined process of pyro-and hydro-metallurgy was introduced in order to improve the grade of Ni powder.Firsdy ,mix the nickel sulfate with sodium hydroxide solution to prepare nickel hy- droxide slurry at room temperature.Without washing and filtering,the slurry was put into the high-pressure reactor where the hydrogen reduction reaction happened in a suspended state.After the reaction, simi-finished Ni powder with about 96% was obtained through liquid solid separation.Then the secondary reduction was carried out in a hydrogen reduction furnace. Under the conditions of reduction temperature 400℃ and reduction time 2 h, the product＇s mass fraction of Ni was over 99.5% and product＇s particle size was less than 2.0 μm,which could meet requirements of performance indexes of diamond tools and ce- mented carbide industries.
出处
《无机盐工业》
CAS
北大核心
2013年第1期34-36,共3页
Inorganic Chemicals Industry
基金
国家高技术研究发展计划(863计划)资助项目(2012AA063204)
关键词
硫酸镍
氢还原
球状超细镍粉
nickel sulfate
hydrogen reduction
ultrafine spherical Ni powder
