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Environment-friendly iron oxide red for permanent magnetic ferrite and preparation method

A technology of iron oxide red and permanent magnetic ferrite, which is applied in the manufacture of iron oxide, iron oxide/iron hydroxide, inductors/transformers/magnets, etc., which can solve the problem of deep removal of silicon dioxide and unsatisfactory ferrite grades. Improvement and other issues, to achieve the effect of less other impurities, enhanced activity, and high content of ferric oxide

Pending Publication Date: 2020-12-25
SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of them mentioned the deep removal of silicon dioxide, which resulted in the inability to improve the grade of ferrite.

Method used

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  • Environment-friendly iron oxide red for permanent magnetic ferrite and preparation method
  • Environment-friendly iron oxide red for permanent magnetic ferrite and preparation method
  • Environment-friendly iron oxide red for permanent magnetic ferrite and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A, sieving; the iron scale rolled by a certain iron and steel plant is sieved with a grading vibrating sieve to remove more than 5 mm in diameter;

[0038] B. Grinding and desiliconization: Grinding with a disc jet mill to obtain 5 micron iron powder; leaching the iron powder with sulfuric acid for 12 hours, then adding a mixed solution of polyferric sulfate, cationic guar gum, and sodium alginate, wherein The mass percent content of polymerized ferric sulfate, cationic guar gum, and sodium alginate in water is 500ppm, 100ppm, and 100ppm, respectively, and the temperature of the system is controlled within the range of 30°C. Add ammonia water to keep the pH value of the system at 5.0, and stir for 15 minutes. , let stand for 6 hours, and filter to obtain the mixed solution after deep silicon removal;

[0039] C. Pre-oxidation: Ammonium bicarbonate is used as a precipitant to convert ferrous carbonate into ferrous carbonate; after that, it is calcined and decomposed to o...

Embodiment 2

[0056] A, sieving; the iron scale rolled by a certain iron and steel plant is sieved with a grading vibrating sieve to remove more than 5 mm in diameter;

[0057] B. Grinding and desiliconization: Grinding with a disc jet mill to obtain 7 micron iron powder; leaching the iron powder with sulfuric acid for 18 hours, then adding a mixed solution of polyferric sulfate, cationic guar gum, and sodium alginate, wherein The mass percent content of polymeric ferric sulfate, cationic guar gum and sodium alginate in water is 10000ppm, 1000ppm and 1000ppm respectively, the temperature of the system is controlled within the range of 60°C, ammonia water is added to keep the pH value of the system at 5.5, and stirred for 20 minutes , let stand for 6 hours, and filter to obtain the mixed solution after deep silicon removal;

[0058] C. Pre-oxidation: Ammonium bicarbonate is used as a precipitant to convert ferrous carbonate into ferrous carbonate; after that, it is calcined and decomposed to...

Embodiment 3

[0065] A, sieving; the iron scale rolled by a certain iron and steel plant is sieved with a grading vibrating sieve to remove more than 5 mm in diameter;

[0066] B. Grinding and desiliconization: Grinding with a disc jet mill to obtain iron powder of 9 microns; leaching the iron powder for 24 hours with sulfuric acid, then adding a mixed solution of polyferric sulfate, cationic guar gum, and sodium alginate, wherein The mass percent content of polymerized ferric sulfate, cationic guar gum, and sodium alginate in water is 5000ppm, 2000ppm, and 500ppm respectively, and the temperature of the system is controlled within the range of 45°C. Add ammonia water to keep the pH value of the system at 5.0, and stir for 30 minutes , stand still for 12 hours, filter to obtain the mixed solution after deep silicon removal;

[0067] C. Pre-oxidation: Ammonium bicarbonate is used as a precipitant to convert ferrous carbonate into ferrous carbonate; after that, it is calcined and decomposed t...

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Abstract

The invention discloses environment-friendly iron oxide red for permanent magnetic ferrite and a preparation method. The method comprises the steps of A, screening, B, grinding and silicon removal, C,pre-oxidation, D, re-oxidation, E, annealing, F, powder preparation and G, testing, wherein chemical component analysis is conducted on the iron powder in the step of testing. According to the method, firstly, iron scales are dissolved, then various inorganic and organic high-molecular polymers are added, on the basis of a polyferric sulfate and cationic guar gum composite silicon removal agent,high-molecular polymer sodium alginate is added, the high-molecular polymer sodium alginate can be used as a carrier to adsorb colloidal silicon particles in a solution, meanwhile, the sodium alginatecan enable the polyferric sulfate and the cationic guar gum to stably exist in a weakly acidic system, and the coagulating sedimentation effect, the electric neutralization capability and the bridgeadsorption effect of a silicon removal agent are fully exerted, so that the purpose of deep silicon removal is achieved.

Description

technical field [0001] The invention belongs to the technical field of ferrite production, and more specifically relates to an environment-friendly iron oxide red for permanent magnet ferrite and a preparation method thereof. Background technique [0002] Permanent ferrite is a magnetic component with iron oxide as the main raw material, which is widely used in automobiles, household appliances, and electric tools. In recent years, the demand for permanent magnet ferrite components has increased significantly as the motors for household appliances have changed from AC to DC. The raw materials used in the production of permanent magnet ferrite at home and abroad mainly come from the iron oxide red after pickling in a steel plant. Due to the pickling process, the iron oxide red contains chloride ions and sulfur ions. When preparing permanent magnet ferrite During the process, not only the equipment is corroded, but also acid gas is produced during the pre-burning process, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06H01F1/11H01F41/02
CPCH01F1/11H01F41/0253C01G49/06C01P2006/80C01P2004/61C01P2004/03
Inventor 李劲松张伟蔡家海杨冲马宝陈军
Owner SINOSTEEL TIANYUAN MAANSHAN TONGLI MAGNETIC MATERIAL
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