Iron oxide red for lithium iron phosphate and preparation method and application thereof

A technology of iron oxide red and lithium iron phosphate, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve problems such as poor effect, and achieve the effect of low cost, high yield and good dispersibility

Active Publication Date: 2016-03-16
SHANGHAI BAOSTEEL MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, some existing research institutions have also carried out some in-depth development of steel mill iron red, but the effect is not good, and the overall performance still has a certain gap with precipitation iron red, which can barely be used in low-end lithium iron phosphate cathode materials.

Method used

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  • Iron oxide red for lithium iron phosphate and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The iron oxide red post-treatment of the steel mill of the present embodiment prepares the iron oxide red technology for lithium iron phosphate including the following steps:

[0029] 1) Turn on low-speed stirring, add electronic grade industrial ultra-pure water, and put in 1 ton of iron oxide red. The amount of water added is 1 times the amount of raw materials. After feeding, turn on the high-speed disperser and stir for 2 hours;

[0030] 2) select 40 mesh sieves for pre-screening;

[0031] 3) Put it into a horizontal sand mill, and control the grinding temperature to 60°C for grinding;

[0032] 4) Carry out magnetic filtration, control flow rate 1m 3 / H;

[0033] 5) Add 1L of Fe(OH) with a concentration of 10g / 100ml 2 ;

[0034] 6) Use a centrifuge to separate to obtain the lower iron oxide red slurry;

[0035] 7) Spray drying at 300°C;

[0036] 8) Add electronic grade industrial ultrapure water, control the water-to-material ratio to 7, and carry out circulat...

Embodiment 2

[0039] The iron oxide red post-treatment of the steel mill of the present embodiment prepares the iron oxide red technology for lithium iron phosphate including the following steps:

[0040] 1) Turn on low-speed stirring, add electronic grade industrial ultra-pure water, and put in 1 ton of iron oxide red at the same time. The amount of water added is 1.5 times the amount of raw materials. After feeding, turn on the high-speed disperser and stir for 1.5 hours;

[0041] 2) select 50 mesh sieves for pre-screening;

[0042] 3) Put it into a horizontal sand mill, and control the grinding temperature to 50°C for grinding;

[0043] 4) Carry out magnetic filtration, control flow rate 3m 3 / H;

[0044] 5) Add 2L of Fe(OH) with a concentration of 5g / 100ml 2 ;

[0045] 6) Use a centrifuge to separate to obtain the lower iron oxide red slurry;

[0046] 7) Spray drying at 250°C;

[0047] 8) Add electronic grade industrial ultrapure water, control the water-to-material ratio to 6, an...

Embodiment 3

[0050] The iron oxide red post-treatment of the steel mill of the present embodiment prepares the iron oxide red technology for lithium iron phosphate including the following steps:

[0051] 1) Turn on low-speed stirring, add electronic grade industrial ultrapure water, and put in 1 ton of iron oxide red at the same time, the amount of water added is twice the amount of raw materials, after feeding is completed, turn on the high-speed disperser and stir for 1 hour;

[0052] 2) select 60 mesh sieves for pre-screening;

[0053] 3) Put it into a horizontal sand mill, and control the grinding temperature to 40°C for grinding;

[0054] 4) Carry out magnetic filtration, control flow rate 5m 3 / H;

[0055] 5) Add 2L of Fe(OH) with a concentration of 10g / 100ml 2 ;

[0056] 6) Centrifuge separation to obtain the lower iron oxide red slurry;

[0057] 7) Spray drying at 200°C;

[0058] 8) Add electronic grade industrial ultrapure water, control the water-to-material ratio to 5, and...

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Abstract

The invention belongs to the technical field of new energy powder, and in particular, relates to a preparation method of iron oxide red for lithium iron phosphate. The preparation method comprises the steps: dispersing electronic-grade industrial ultra-pure water and steel factory iron oxide red; sieving the iron oxide red suspension with a sieve, and sieving to remove large-particle matters; grinding the sieved iron oxide red suspension with a horizontal sand mill; carrying out magnetic filtration; adding an iron-based compound; treating the mixed solution with a material water separation device to obtain an iron oxide red slurry; carrying out spray drying; mixing and dispersing with electronic-grade industrial ultra-pure water, treating with the material water separation device, carrying out spray drying, and thus obtaining the iron oxide red for lithium iron phosphate. Compared with a process for preparing iron oxide red for lithium iron phosphate through a precipitation method, the preparation method has the advantages of low environmental effect, high material obtaining rate, good dispersion, narrower particle size distribution, and higher specific surface area; and compared with a conventional Ruthner method for iron oxide red for lithium iron phosphate, the method has the advantage that the performance has relatively large improvement.

Description

technical field [0001] The invention belongs to the technical field of new energy powders, and in particular relates to iron oxide red for preparing lithium iron phosphate after post-treatment of iron oxide red in steel mills, a preparation method and application thereof. Background technique [0002] According to the different sources of iron, the existing preparation processes of lithium iron phosphate cathode materials in China mainly fall into three categories—ferrous oxalate process, iron oxide red process and iron phosphate process. In terms of the convenience and environmental protection of iron sources, the existing iron oxide red preparation process is obtained through comprehensive utilization of waste in whole or in part. The preparation process has a long history compared with the other two processes, and the quality control technology is relatively more mature. Resources are relatively easier to obtain, and the price is relatively cheaper, so it is more likely t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
CPCC01G49/06C01P2004/51C01P2004/62C01P2006/40C01P2006/80
Inventor 黄华特
Owner SHANGHAI BAOSTEEL MAGNETICS
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