A kind of preparation method of high-purity ultrafine spherical cobalt carbonate

Abstract

The invention discloses a preparation method of high-purity superfine spherical cobalt carbonate, and belongs to the field of preparation of metal powder materials. The preparation method is as follows: metal cobalt is used as a raw material to prepare a cobalt salt solution, a complexing agent is used for prepare a complexed cobalt salt solution from the cobalt salt solution, a mixture of an ammonium salt and urea is prepared in to a precipitant solution, a dispersant is added into the precipitant solution, the complexed cobalt salt solution and the precipitant are added agent according to a certain volume ratio by a parallel flow feeding method into a reactor for reaction, the reaction temperature is controlled at 50-80 DEG C, the pH value is controlled to 7.8-8.3, and the stirring speed is 60-200rpm, and finally the superfine spherical cobalt carbonate is obtained by washing, filtering and drying of prepared cobalt carbonate. The preparation method has the advantages of simple production process, easy control, short production cycle, high efficiency and continuous production, a prepared cobalt carbonate product has the advantages of good mobility, uniform particle size distribution, spherical microtopography, high chemical purity and good chemical properties.

Description

technical field [0001] The invention belongs to the field of metal powder material preparation, and in particular relates to a preparation method of high-purity ultrafine spherical cobalt carbonate. Background technique [0002] In the field of diamond tools and hard alloy materials, the quality of cobalt powder has a great influence on the performance of the alloy. In order to meet the requirements of high-end hard alloy and cobalt powder for diamond tools, high-quality ultra-fine cobalt powder is being paid more and more attention. The method of preparing cobalt powder with cobalt oxalate has been reported, but due to the genetic characteristics of cobalt oxalate raw material, the cobalt powder prepared with cobalt oxalate has a coarse powder particle size, and the powder shape is mostly poor dendritic or needle-like, and the shape The appearance is difficult to control, so its application is limited. Further improving the particle size and shape of cobalt powder, produci...

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Problems solved by technology

[0003] The traditional production of cobalt carbonate adopts a batch-type discontinuous production process. The precipitant is directly added to the cobalt-containing solution for precipitation reaction. The chance of agglomeration between particles, and the phenomenon of peritectic and alkali-coated segregation will eventually result in uneven particle size distribution and various shapes (dendritic, flake, rod, etc.), which are not conducive to product stability.

The traditional process requires complex processes such as washing, centrifugal filtration, sediment drying, crushing, and screening, and the control of flow, temperature difference, and pH value is unstable and inaccurate, resulting in uneven distribution of product particles and poor consistency, which is not conducive to product quality. stable, it is difficult to produce ultrafine spherical cobalt carbonate

Basic cobalt carbonate prepared in the patent "spherical agglomerated basic cobalt (II) carbonate (II) and cobalt hydroxide (II) and its production method and application" published in 1998 by German Stark company (patent number: 96195592) The sphericity is higher, but cobalt carbonate is a spherical particle formed by the aggregation of fine particles, not a real spherical cobalt carbonate; mentioned in the domestic patent "spherical cobalt carbonate production method" (patent number: 200810143011.X) Preparation method, although the physical appearance and physical indicators of the prepared cobalt carbonate are acceptable, but the reaction temperature is low in the preparation process, and involves aging growth time of up to 18 hours, which is not conducive to the improvement of production efficiency

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