Clean and economical preparation of Ca-La-Co substituted permanent ferrite magnet with ultrapure magnetite concentrate
Source abstract
Abstract
For the first time, ultrapure magnetite concentrate (UMC) was studied to prepare Ca-La-Co substituted magneto plumbite type (M-type) permanent ferrite magnet (PFM). UMC with a purity of 99.6 % was purified from magnetite concentrate. PFM prepared with UMC had fully reached the standard of La-Co substituted 9BF product of Pacific Metals (Br>420 mT, Hcj>374 kA/m) under the optimized chemical formula of Sr 0.3Ca 0.3La 0.4Fe 11.5Co 0.3O 18.7 and suitable process conditions. The PFM prepared with the UMC had higher Hcb and Hcj but lower Br and BH max as Compared to the PFM prepared with the conventional high-quality iron oxide red. Impurities of SiO 2 and Al 2O 3 in UMC thermodynamically formed Sr 2Al 2SiO 7 in magnetic powder, which effectively inhibited abnormal grain growth but decreased the purity of main phase. UMC owns the merits of low raw material cost, large potential production capacity and almost pollution-free. The feasibility of UMC used for the high-performance PFM preparation has been confirmed and it has a promising prospect from the views of economic gains and environmental benefits.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Magnetic Properties and Applications · Magnetic Properties of Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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