Method for preparing composite ferrite from lithium battery cathode waste

A lithium battery, ferrite technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., to achieve the effect of high saturation magnetization and high quality

Active Publication Date: 2016-08-03
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For existing lithium batteries LiFePO 4 The deficiencies of positive electrode waste treatment technology, the purpose of the invention is to provide a kind

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment relates to a preparation method of composite ferrite, which comprises the following steps:

[0029] Step 1, remove the aluminum foil lithium battery LiFePO 4 Add 75% dilute sulfuric acid to the positive electrode waste according to the solid-to-liquid mass ratio of 1:3 for stirring and dissolving;

[0030] In step 2, the turbid solution obtained in step 1 is filtered to obtain + and Fe 2+ the filtrate;

[0031] The containing Li + and Fe 2+ Filtrate, Li + The concentration is 0.065g / mL, Fe 2+ The concentration is 0.054g / mL;

[0032] Step 3, get the filtrate gained in step 2 and join in the Cr 6+ In the electroplating wastewater, and stirred for 5 minutes;

[0033] The Cr 6+ The heavy metal content of electroplating wastewater is:

[0034] Cr 6+ 1500mg / L, Cr 3+ 10mg / L, Ni 2+ 110mg / L, Fe 3+ 300mg / L;

[0035] The Cr 6+ The pH of the electroplating wastewater was adjusted to 0.5 in advance.

[0036] The added Fe 2+ with Cr 6+ The molar rati...

Embodiment 2

[0044] This embodiment relates to a preparation method of composite ferrite, which comprises the following steps:

[0045] Step 1, remove the aluminum foil lithium battery LiFePO 4 Add 75% dilute sulfuric acid to the positive electrode waste according to the solid-to-liquid mass ratio of 1:5 for stirring and dissolving;

[0046] In step 2, the turbid solution obtained in step 1 is filtered to obtain + and Fe 2+ the filtrate;

[0047] The containing Li + and Fe 2+ Filtrate, Li + The concentration is 0.151g / mL, Fe 2+ The concentration is 0.148g / mL;

[0048] Step 3, get the filtrate gained in step 2 and join in the Cr 6+ In the electroplating wastewater, and stirred for 15 minutes;

[0049] The Cr 6+ The heavy metal content of electroplating wastewater is:

[0050] Cr 6+ 5000mg / L, Cr 3+ 50mg / L, Ni 2+ 200mg / L, Fe 3+ 500mg / L;

[0051] The Cr 6+ The pH of the electroplating wastewater was adjusted to 4 in advance.

[0052] The added Fe 2+ with Cr 6+ The molar rat...

Embodiment 3

[0060] This embodiment relates to a preparation method of composite ferrite, which comprises the following steps:

[0061] Step 1, remove the aluminum foil lithium battery LiFePO 4 Add 75% dilute sulfuric acid to the positive electrode waste according to the solid-to-liquid mass ratio of 1:4 for stirring and dissolving;

[0062] In step 2, the turbid solution obtained in step 1 is filtered to obtain + and Fe 2+ the filtrate;

[0063] The containing Li + and Fe 2+ Filtrate, Li + The concentration is 0.112g / mL, Fe 2+ The concentration is 0.118g / mL;

[0064] Step 3, get the filtrate gained in step 2 and join in the Cr 6+ In the electroplating wastewater, and stirred for 15 minutes;

[0065] The Cr 6+ The heavy metal content of electroplating wastewater is:

[0066] Cr 6+ 4000mg / L, Cr 3+ 30mg / L, Ni 2+ 170mg / L, Fe 3+ 400mg / L;

[0067] The Cr 6+ The pH of the electroplating wastewater was adjusted to 2 in advance.

[0068] The added Fe 2+ with Cr 6+ The molar rat...

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Abstract

The invention provides a method for preparing composite ferrite from lithium battery cathode waste.The method comprises the following steps that lithium battery cathode waste (LiFePO4) of which aluminum foil is removed is treated, and filtrate containing Li<+> and Fe<2+> is obtained; the filtrate is added into electroplating waste water containing Cr<6+>, stirring is conducted to be uniform, a trivalent iron source is added, the pH value is adjusted to be alkaline after the trivalent iron source is dissolved, and a hydrothermal reaction is conducted at high temperature; precipitates are collected, washed and dried, and the composite ferrite is obtained.Compared with the prior art, the method for preparing the composite ferrite from the lithium battery cathode waste has the following advantages that the method of treating the waste with waste is adopted, Fe<2+> in the lithium battery cathode waste (LiFePO4) is used for reducing Cr<6+> in the electroplating waste water, and the composite ferrite which is high in quality and is of a spinel structure is obtained by means of the high-temperature hydrothermal reaction; the saturation magnetization intensity of the prepared composite ferrite can reach 100 emu/g, and the magnetic performance of the prepared composite ferrite is obviously superior to that of composite ferrite obtained through water bath by means of a coprecipitation method.

Description

technical field [0001] The invention relates to a method for preparing composite ferrite by using lithium battery positive electrode waste, belonging to lithium battery LiFePO 4 The field of positive electrode waste resource utilization. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) batteries are widely used in electronic products because they do not contain heavy metals and have high stability. When a large number of electronic products are scrapped, lithium iron phosphate batteries need to be properly treated to avoid environmental pollution and waste of resources. Currently for lithium batteries LiFePO 4 There are two main methods for the treatment of positive electrode waste: one is to treat LiFePO 4 The positive electrode material is repaired; the other is to prepare lithium ferrite. [0003] People such as Dai Changsong (CN102664294A) will LiFePO 4 The mixed powder is acid-cleaned, and LiFePO is obtained by high-temperature calcination after ad...

Claims

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Application Information

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IPC IPC(8): C01G53/00
CPCC01G53/00C01P2006/42
Inventor 黄寿强孙同华朱南文李良
Owner SHANGHAI JIAO TONG UNIV
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