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Process for preparing quasi-spherical black ferroferric oxide magnetic powder

A ferroferric oxide magnetic and spherical-like technology, which is applied in the synthesis of magnetic powder and the preparation of spherical black ferroferric oxide magnetic powder, can solve the problems of insufficient uniform particle size, complicated synthesis method, and inability to be widely used. The effect of low cost and uniform particle size

Inactive Publication Date: 2006-09-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particles of ferroferric oxide magnetic powder prepared by the traditional preparation method are cubic, and the particle size is not uniform enough, so it does not have good and stable magnetic powder properties
Spherical particle magnetic powder has superior properties such as good fluidity, but spherical ferric oxide magnetic powder is only produced in a few developed countries (such as Germany, the United States, etc.), and because the synthesis method is relatively complicated and the price is relatively expensive, it cannot be widely used. use

Method used

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  • Process for preparing quasi-spherical black ferroferric oxide magnetic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 216 grams of ferrous sulfate and 156 grams of ferric sulfate, add water and stir to dissolve to obtain a mixed solution; when the temperature rises to 40°C, add sodium carbonate solution to the mixed iron salt solution to make the pH value 8, bubbles will be generated and precipitation will occur at the same time to obtain a precipitate material slurry; at this time, air is blown in, the temperature continues to rise to 80°C, and 3mol·L -1 sodium hydroxide solution until the pH value is 11, carry out the reaction crystallization process, keep the heat preservation and stand for 2 hours, separate the slurry and the clear liquid, wash the slurry with water, filter under reduced pressure, dry at 55 ° C, and put it into the grinder Grind in a bowl to obtain the product with a yield of 92%. The average particle size of the product is 100nm, the specific saturation magnetization is 90emu / g, the coercive force is 80Oe, and the remanence is 6emu / g.

Embodiment 2

[0015] Weigh 216 grams of ferrous sulfate and 22 grams of ferric sulfate, add water and stir to dissolve to obtain a mixed solution; when the temperature rises to 40°C, add sodium carbonate solution to the mixed iron salt solution to make the pH value 8, generate bubbles and precipitate at the same time to obtain a precipitate material slurry; at this time, air is blown in, the temperature continues to rise to 80°C, and 3mol·L -1 sodium hydroxide solution until the pH value is 11, carry out the reaction crystallization process, keep the heat preservation and stand for 2 hours, separate the slurry and the clear liquid, wash the slurry with water, filter under reduced pressure, dry at 55 ° C, and put it into the grinder Grind in a bowl to obtain the product with a yield of 92%. The average particle size of the product is 120nm, the specific saturation magnetization is 95emu / g, the coercive force is 900e, and the remanence is 10emu / g.

Embodiment 3

[0017] Weigh 216 grams of ferrous sulfate, add water and stir to dissolve to obtain a solution; when the temperature rises to 70°C, air is blown in, and 3mol L -1 sodium hydroxide solution to adjust the pH value of the solution to 9, and a precipitation reaction occurs while bubbling to obtain a sediment slurry; continue to bubble air, and heat up to 80°C, add 3mol L -1 NaOH solution until the pH value is 11, carry out the reaction crystallization process, keep the heat preservation for 2 hours, separate the slurry from the clear liquid, wash the slurry with water, filter under reduced pressure, dry at 55°C, and put it into a mortar for grinding Fine, the product is obtained with a yield of 92%; the average particle size of the product is 150nm, the specific saturation magnetization is 95emu / g, the coercive force is 100Oe, and the remanence is 12emu / g.

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Abstract

The invention discloses a Method for preparation of quasi sphericity black ferriferrous oxide magnetic powder, belonging to the compositing technique of magnetic powder. This method containing steps as follows: mixing the ferrisulphas and ferric persulfate according to mol ratio as 1:0-0.8 and adding water mill to dissolve, and then heating-up adding sodium carbonate solution, or blowing air and adjusting Ph value as 7-9 by caustic lye of soda, in order to forming bubble chamber microenvironment and making precipitate slurry in this environment, making the precipitate slurry in bubble chamber microenvironment, 70-95 Deg C, pH value 9-12 doing reaction to crystallization, after water filtration, drying,comminuting, getting quasi sphericity black ferriferrous oxide magnetic powder. The advantage of this invention is lies in: forming given bubble chamber microenvironment by controlling condition in synthesize course, in order to reach the purpose of controlling the appearance of magnetic powder as quasi sphericity. The method is simple, the cost is low, the products' appearance is quasi sphericity, the granularity is quite equal, the mean particle diameter is 50-200nm.

Description

technical field [0001] The invention relates to a method for preparing spherical black ferroferric oxide magnetic powder, which belongs to the synthesis technology of magnetic powder. Background technique [0002] Black iron ferric oxide magnetic powder is an important and widely used magnetic material. It is one of the main raw materials for the production of copy toner (using its black color and magnetic properties). The production of high-grade toner requires relatively high-grade magnetic powder as raw material. For magnetic powder The particle morphology, particle size distribution, magnetic properties, etc. have higher requirements. [0003] According to different requirements, there are two types of ferroferric oxide magnetic powder used in copying toner: cubic particle and spherical particle magnetic powder. Most of the ferroferric oxide magnetic powder produced in China is cubic particle products, and there is no manufacturer producing spherical ferric ferric oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08
Inventor 杨桂琴严乐美
Owner TIANJIN UNIV
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