Method for preparing spherical cobalt powder

Abstract

The invention provides a method for preparing spherical cobalt powder. The method includes the following steps of mixing CoCL2.6H2O with polyhydric alcohols, adding alkali liquor, preparing mixed solutions with the cobalt concentration of 5-30g / L, heating for 196-198 DEG C, reflux carried out for 2-4 hours, suction filtration, washing, hydrogen drying and reduction under the temperature of 300-500 DEG C, and preparing the cobalt powder. According to the method, the cobalt salt CoCL2.6H2O is directly utilized to be reacted with the polyhydric alcohols to prepare the spherical cobalt powder, and consumed time is shortened by 40%-60% of the time of a traditional cobalt salt reduction method. According to the method, the polyhydric alcohols and the hydrogen drying and the reduction under a high temperature are adopted, not only is spherical appearance of the polyhydric alcohol reduction cobalt powder saved, but also purity of the cobalt powder is improved, under the condition that the cobalt concentration is up to 5-30g / L in an industrialized process, the prepared spherical cobalt powder has good appearance characteristics, the grain size of products can be controlled, and the cobalt conversion rate is up to more than 98%.

Description

technical field [0001] The invention relates to raw cobalt powder in the field of cemented carbide, in particular to a method for preparing spherical cobalt powder. Background technique [0002] Cemented carbide is usually prepared by mixing refractory metal carbide and binder metal (such as cobalt powder). In addition to strict requirements on the purity of cobalt powder, the preparation of cemented carbide also has high requirements on its particle size and morphology. Most of our country adopts the hydrogen reduction method to produce cobalt powder, and the cobalt powder produced is unevenly distributed and dendritic, which limits the development of high-performance cemented carbide to a certain extent. [0003] Spherical cobalt powder has the following advantages: it is spherical particles, has the lowest porosity and relative sliding friction coefficient, and excellent expansion and ductility; when mixed with other substances, it shows good miscibility, so it can avoid...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are as follows: (1) it is two-step synthesis, and the technological process is time-consuming; (2) it is limited to literature reports, that is, in the experimental stage, the cobalt concentration is too low, and the cobalt conversion rate is correspondingly low; (3) it does not It is beneficial to industrial production, because the reaction conditions around 200°C are not easy to operate and realize, and more importantly, the C content (introduced by organic ethylene glycol) and O content (introduced in the process of filtering and drying) in the spherical cobalt powder are relatively high. As a result, the purity of the spherical cobalt powder is not high. If the production is directly expanded, the morphology of the product may be affected due to the amplification effect.

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