A kind of production method of spherical cobalt basic carbonate with controllable particle size

Abstract

The invention discloses a production method of spherical cobalt basic carbonate with controllable particle size. The general steps of the method are: ①preparation of solution; ②magnetic induction nucleation; ③grain growth; ④press filtration and washing; ⑤drying . The method reduces the nucleation supersaturation by applying an external magnetic field when synthesizing basic cobalt carbonate, shortens the induced nucleation period, and forms a large amount of basic cobalt carbonate crystal nuclei in the solution instantaneously. At the same time, by controlling the stirring speed, reaction temperature, The addition speed of the cobalt liquid can well adjust the quality of the product to achieve the effect of uniform particle and spherical shape, so that the cobalt content can reach more than 52%. The particle size of the basic cobalt carbonate product of the present invention is a standard normal distribution, the particles are uniform, and the fluidity is good, and the maximum D50 exceeds 40 μm, which realizes the uniformity and stability of the particle size of the large-particle spherical cobalt basic carbonate in continuous production on a large scale. Moreover, the process is simple, easy to operate, and low in cost, and provides high-quality raw materials for the production of high-end lithium batteries.

Description

technical field [0001] The invention relates to the field of chemical preparation, in particular to a production method of spherical basic cobalt carbonate with controllable particle size. Background technique [0002] Cobalt subcarbonate [2CoCO 3 3Co(OH) 2 ·H 2 O] is a purple-red prismatic powder, soluble in dilute acid and liquid ammonia, almost insoluble in cold water, decomposed in hot water, mainly used in the preparation of various cobalt products, such as cobalt powder, cobalt tetroxide, cobalt oxide, etc., these The particle size, shape and other powder thermal properties of cobalt products are greatly inherited from the performance of its precursor cobalt carbonate, and it has a wide range of uses in electronics, metallurgy, chemical industry and other fields, especially in the battery industry as battery-grade Co 3 o 4 Precursor. At the same time, the current preparation process of lithium cobalt oxide shows that the use of large particle size spherical cobalt...

AI Technical Summary

Problems solved by technology

This process is easy to operate and the production cycle is short; however, the performance of the produced product is unstable, easy to oxidize, and the product particles are uneven, small in size, difficult to control, and the cobalt metal content can only reach 46%-50%, so it is not conducive to Efficient and refined production is prone to great waste

Now, a nano-synthesis method has been developed to produce basic cobalt carbonate materials. Although this technology is relatively advanced and guarantees product quality, the production cost is very high, the equipment and instruments are required to be precise, and the cost is huge. Therefore, Currently, there is no condition for large-scale promotion

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