Production method of spherical basic cobalt carbonate with controllable particle size

Abstract

The invention discloses a production method of spherical basic cobalt carbonate with a controllable particle size, and the production method comprises the following general steps of: (1) preparing ofa solution; (2) magnetic inducing nucleation; (3) grain growth; (4) filter pressing and washing; and (5) drying. According to the method, nucleation supersaturation is reduced by applying of an external magnetic field during the synthesis of the basic cobalt carbonate, the induction nucleation period is shortened, and a large amount of basic cobalt carbonate crystal nuclei are instantly formed inthe solution; meanwhile, the quality of the product can be well adjusted by controlling the stirring speed, the reaction temperature and the adding speed of a cobalt liquid, so that the effects of uniform particles and spherical morphology are achieved, and the cobalt content can reach more than 52%. The basic cobalt carbonate product has standard normal distribution of particle size, uniform particle size and good fluidity, and the maximum D50 exceeds 40mu m, the uniformity and stability of the particle size of large-scale continuous produced spherical basic cobalt carbonate can be realized,and the production method simple process, easy operation and low cost, and provides a high-quality raw material 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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