Production method of permanent magnetic ferrite pre-sintering material

Abstract

The invention discloses a production method of a permanent magnetic ferrite pre-sintering material. The production method comprises the following steps: a mixture of a permanent magnetic ferrite raw material iron oxide red and strontium carbonate is placed in a material mixing tower; water, ammonia water and calcium gluconate are added; stirring and grinding are carried out; the mass ratio of ironoxide red to the strontium carbonate in material slurry at the upper end of the material mixing tower or at the lower end of the material mixing tower is controlled to be (5.95-6.65):1; the mass ratio fluctuation of the iron oxide red to the strontium carbonate in the material slurry at the upper end of the material mixing tower or at the lower end of the material mixing tower is less than or equal to 0.10:1, so that a mixed material with corrected components is obtained; and the mixed material with corrected components is subjected to dehydration, pre-sintering in a rotary kiln, cooling in acooling kiln and crushing in a ball mill according to the prior art. According to the invention, a proper amount of the ammonia water and the calcium gluconate are added in a mixing process of the raw materials of the ferrite pre-sintering material, so that a problem of consistency of the material mixing process is solved, a problem that consistency of product performance after sintering is pooris solved, and stability of products can be effectively guaranteed.

Description

technical field [0001] The invention relates to a production method of a permanent magnet ferrite pre-sintered material, in particular to a production method of a permanent magnet ferrite pre-sintered material with good stability. Background technique [0002] Since the mass production of permanent ferrite in the 1950s, the process has become more mature and its performance has been significantly improved. However, the large-scale and stable production of high-end, high-quality ferrite technology is still immature. There are many types of permanent ferrite, and the shapes and sizes of magnets vary. Users have different requirements for product quality, which brings difficulties to large-scale production. The production process of permanent magnet ferrite calcined material in the prior art still has certain deficiencies, and the product performance stability is not high, which directly affects the product stability of the downstream supply chain. [0003] In the prior art, t...

AI Technical Summary

Problems solved by technology

However, the large-scale and stable production of high-end, high-quality ferrite technology is still immature. There are many types of permanent ferrite, and the shape and size of magnets are different. Users have different requirements for product quality, which brings difficulties to large-scale production.

The existing production process of permanent magnet ferrite calcined material still has certain deficiencies, and the stability of product performance is not high, which directly affects the stability of products in the downstream supply chain

[0003] In the prior art, the following problems exist in the production of permanent magnet ferrite calcined materials: when the mixture of iron red and strontium carbonate is mixed and ground in the stirring tower, the same batch (20.4T) of products obtained at the same calcined temperature The difference in intrinsic coercive force value is up to 150Oe under the same secondary formulation process, and the product stability is not high, which affects subsequent production

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