Method for preparing barium ferrite by directly utilizing low-grade witherite as raw material

A technology of barium ferrite and witherite, which is applied in the field of barium ferrite prepared directly by using low-grade witherite as raw material, which can solve the problems of wasting energy and manpower, barium ferrite consumption, etc., and achieves convenient operation and wide application , good social and economic benefits

Inactive Publication Date: 2019-03-19
城口县生产力促进中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art that the preparation of barium ferrite not only consumes resources and energy, but also wastes a lot of manpower.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for directly using low-grade witherite as a raw material to prepare barium ferrite is characterized in that it comprises the following steps:

[0031] 1) Prepare barium chloride solution

[0032] 1.1) Add the witherite sieved by the ball mill into the hydrochloric acid solution, stir, and wet leaching;

[0033] The weight ratio of described witherite and hydrochloric acid solution is 1: 1;

[0034] The weight-volume ratio (g:mL) of described witherite and water is 1:2;

[0035] The temperature of the leaching is 30°C, and the leaching time is 1h;

[0036] During the stirring process in the step 1.1): the stirring rate is 150r / min, and the stirring time is 1h.

[0037] 1.2) Suction filtration of the leached liquid obtained in step 1.1) to obtain a separated solid phase and liquid phase, washing the solid phase, and collecting the washed liquid;

[0038] 1.3) After mixing the separated liquid phase and the washed liquid obtained in step 1.2), mixture A is obt...

Embodiment 2

[0049] A method for directly using low-grade witherite as a raw material to prepare barium ferrite is characterized in that it comprises the following steps:

[0050] 1) Prepare barium chloride solution

[0051] 1.1) Add the witherite sieved by the ball mill into the hydrochloric acid solution, stir, and wet leaching;

[0052] The weight ratio of described witherite and hydrochloric acid solution is 1: 2;

[0053] The weight to volume ratio (g:mL) of described witherite and water is 1:4;

[0054] The temperature of the leaching is 50°C, and the leaching time is 2h;

[0055] During the stirring process in the step 1.1): the stirring rate is 200r / min, and the stirring time is 2h.

[0056] 1.2) Suction filtration of the leached liquid obtained in step 1.1) to obtain a separated solid phase and liquid phase, washing the solid phase, and collecting the washed liquid;

[0057]1.3) After mixing the separated liquid phase and the washed liquid obtained in step 1.2), mixture A is o...

Embodiment 3

[0068] A method for directly using low-grade witherite as a raw material to prepare barium ferrite is characterized in that it comprises the following steps:

[0069] 1) Prepare barium chloride solution

[0070] 1.1) Add the witherite sieved by the ball mill into the hydrochloric acid solution, stir, and wet leaching;

[0071] The weight ratio of described witherite and hydrochloric acid solution is 1: 3;

[0072] The weight-to-volume ratio (g:mL) of described witherite and water is 1:6;

[0073] The temperature of the leaching is 70°C, and the leaching time is 3h;

[0074] During the stirring process in the step 1.1): the stirring rate is 250r / min, and the stirring time is 3h.

[0075] 1.2) Suction filtration of the leached liquid obtained in step 1.1) to obtain a separated solid phase and liquid phase, washing the solid phase, and collecting the washed liquid;

[0076] 1.3) After mixing the separated liquid phase and the washed liquid obtained in step 1.2), mixture A is ...

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Abstract

The invention discloses a method for preparing barium ferrite by directly utilizing low-grade witherite as a raw material. A barium ferrite product is synthesized by taking low-grade witherite as a raw material and adopting technological means such as wet-process mineral leaching, reasonable liquid preparation, chemical coprecipitation synthesis and high-temperature calcination. According to the method, the mass ratio of witherite and hydrochloric acid in a leaching process is 1:1 to 1:5, the solid-to-liquid ratio (g / ml) of witherite to water is 1:2 to 1:9, the leaching temperature is 30-90 DEG C, and the leaching time is 1-6 h; the pH range in a precipitation process is 8-12; the calcination temperature in the calcination process is 700-1400 DEG C, and the calcination time is 1-6 h. The local low-grade witherite is sufficiently utilized while the barium ferrite product with a high additional value is prepared, so that high social and economic benefits are achieved. Compared with an existing technology for preparing barium ferrite, the method has the advantages that not only is the advantage of magnetic property retained, but also various defects are overcome, so that the total preparation cost is relatively low.

Description

technical field [0001] The invention relates to the fields of hydrometallurgy and barium ferrite preparation, in particular to a method for directly using low-grade witherite as a raw material to prepare barium ferrite. Background technique [0002] Barium ferrite materials are widely used in instruments and meters, electroacoustic motors, magnetic separation and magnetization and other equipment. Barium ferrite belongs to a class of permanent magnet materials studied earlier, and the expression of its compound can be written as BaFe 12 o 19 . [0003] The process of preparing barium ferrite actually includes the process of adjusting the Ba / Fe ratio. In the prior art, methods for preparing barium ferrite include mechanical ball milling, chemical co-precipitation, sol-gel method, hydrothermal method, self-propagating high-temperature synthesis method, and the like. However, the raw materials used in the preparation of barium ferrite by these methods are all high-purity ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/0036C01P2006/42
Inventor 刘仁龙刘作华陶长元杜军周小霞刘培乔刘尚东曾军辉唐金晶范兴孔令峰谢昭明刘艳霞邓丽
Owner 城口县生产力促进中心
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