CN209264388U - It is a kind of for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide - Google Patents

Abstract

The utility model discloses a device for separating and collecting magnetic substances in electrolytic manganese dioxide, which comprises a sample bottle, a bottle cap, a permanent magnet, a casing and a three-dimensional mixer, the three-dimensional mixer cooperates with the casing, and the bottle cap and the sample bottle Tightly fit, the sample bottle is placed in the shell, four permanent magnets are placed on the bottom of the shell, and four groups of permanent magnets are vertically placed in the gap between the shell and the outer periphery of the sample bottle. The device of the present application is used to separate and collect the magnetic substances in electrolytic manganese dioxide, utilize the characteristics of ferromagnetic impurities and ferrimagnetic impurities in electrolytic manganese dioxide products, and use an adsorption device to adsorb the magnetic substances in EMD, then separate / Collect and clean, test, and obtain the content of magnetic substances in EMD products. The utility model can meet the detection requirements of the secondary power supply manufacturers for the magnetic substance in the EMD product, and can provide an effective detection means for improving the EMD production process to reduce the magnetic substance content of the EMD.

Description

A device for separating and collecting magnetic substances in electrolytic manganese dioxide

technical field

The utility model relates to the field of electrolytic manganese dioxide, in particular to a device for separating and collecting magnetic substances in electrolytic manganese dioxide.

Background technique

Electrolytic manganese dioxide (EMD) is one of the key materials for batteries, and qualified EMD products are produced through manganese leaching → refining and impurity removal → electrolysis → post-treatment. Reaction formula: MnSO ₄ + H ₂ O = MnO ₂ + H ₂ SO ₄ + H ₂ .

The EMD semi-finished product obtained in the electrolysis process is a large block, which needs to be processed through grinding→neutralization→drying to process the block EMD semi-finished product to the technical requirements required by the battery manufacturer (general particle size requirement: D50 is about 10- 100µm).

Due to the high hardness of EMD semi-finished products, and the grinding parts are generally special steel or alloy steel (such as Co, Mo, Cr, Ni, Cu, Zn and other metals), due to mechanical chemical reaction or friction during the grinding process of semi-finished products, produce A large amount of abrasive powder enters the EMD product, and at the same time brings metal impurities into it, affecting the quality of the EMD product. How to judge the amount of impurities is also a method to judge the quality of EMD.

At present, the general detection method is to dissolve EMD directly through acid, and analyze the content of metal impurity elements by plasma spectroscopy. Elemental substances are far more harmful to batteries than metal ions, and existing testing methods can only analyze the total amount of metal impurities. After research, it is found that EMD metal elements are mainly brought in from grinding equipment, and these impurities are mostly ferromagnetic substances or sub- Ferromagnetic substances are magnetic. We call this magnetic impurity in EMD as magnetic substance.

Lithium-ion battery cathode materials include lithium cobalt oxide (LiCoO ₂ ), lithium manganese oxide (LiMn ₂ O ₄ ), ternary materials (LiNiMnCoO ₂ ) and lithium iron phosphate (LiFePO ₄ ), etc. In recent years, due to the more comprehensive and in-depth research on the structure and performance of lithium-ion battery cathode materials, it has been found that lithium-ion battery cathode materials contain magnetic metal impurities. The existence of these magnetic substances will not only reduce the ratio of materials Capacity and energy density, and some magnetic impurities dissolve in the electrolyte, a series of side reactions occur, reducing the service life, consistency and safety performance of the battery. The magnetic substance in the positive electrode material of lithium ion battery also has a direct impact on self-discharge, and the content of magnetic substance is directly proportional to the self-discharge rate of the battery, that is, the higher the positive electrode material content of the magnetic substance, the greater the self-discharge rate of the battery composed of it.

Therefore, as lithium manganese oxide, one of the main positive electrode materials of lithium-ion batteries, the magnetic metal impurities are mainly brought in by EMD. How to accurately separate/collect the magnetic substances in EMD products in order to detect the content of magnetic substances in EMD products is very important for the stability of lithium It is of great significance to improve the quality of lithium manganese oxide, the positive electrode material of lithium-ion batteries, and improve the performance of lithium-ion batteries.

Contents of the invention

The purpose of the utility model is to provide a device for separating and collecting magnetic substances in electrolytic manganese dioxide, so as to analyze the content of magnetic substances in EMD products.

In order to achieve the above object, the device for separating and collecting magnetic substances in electrolytic manganese dioxide of the present utility model includes a sample bottle, a bottle cap, a permanent magnet, a shell and a three-dimensional mixer, and the three-dimensional mixer cooperates with the shell, and the The bottle cap is tightly fitted with the sample bottle, the sample bottle is placed in the shell, four permanent magnets are placed on the bottom of the shell, and four sets of permanent magnets are vertically placed in the gap between the shell and the sample bottle periphery.

Further, the four sets of vertically placed permanent magnets are placed symmetrically by two in each set.

Further, each of the four groups of permanent magnets is composed of four mutually attracting permanent magnets.

Further, the shape of the sample bottle is a cuboid.

Further, the sample bottle is made of acid-resistant non-magnetic metal or non-metal material.

Preferably, the material of the sample bottle is one of polytetrafluoroethylene, PVC and PP.

Further, the shape of the permanent magnet is columnar.

Preferably, the material of the shell is polytetrafluoroethylene.

Substantive features and progress of the present utility model are:

The device of the present application is used to separate and collect magnetic substances in electrolytic manganese dioxide, mainly utilizes the magnetic properties of ferromagnetic substances and ferrimagnetic substances, and adopts an adsorption device composed of sample bottles, shells, permanent magnets, and three-dimensional mixers. After the magnetic substance in the EMD is adsorbed, it is separated/collected, cleaned, and detected to obtain the content of the magnetic substance in the EMD product. The utility model can effectively separate the magnetic substance in the EMD product, so as to analyze the magnetic substance content of the EMD product, meet the detection requirements of the secondary power supply manufacturers for the magnetic substance in the EMD product, and can improve the EMD production process to reduce the content of the magnetic substance in the product. The content of magnetic substances provides an effective detection method, so as to verify the actual effect of process improvement, better control the introduction of magnetic substances in EMD products, improve the quality of lithium manganate materials, and at the same time affect the life, consistency and safety of lithium-ion batteries It is of great significance to increase the specific capacity.

Description of drawings

Fig. 1 is the structural front view of the present utility model.

FIG. 2 is a top view of FIG. 1 .

The serial numbers and names of parts in the figure:

Bottle cap 1, sample bottle 2, shell 3, permanent magnet 4.

Detailed ways

Describe the implementation structure of the present utility model below in conjunction with accompanying drawing:

The device for separating and collecting magnetic substances in electrolytic manganese dioxide of the present utility model includes a sample bottle 2, a bottle cap 1, a permanent magnet 4, a shell 3 and a three-dimensional mixer, and the three-dimensional mixer cooperates with the shell 3, and the shell 3 The material is polytetrafluoroethylene. The bottle cap 1 is tightly fitted with the sample bottle 2, and the sample bottle 2 is placed in the shell 3. There are four permanent magnets 4 that attract each other on the bottom of the shell 3, and there are vertically placed in the gap between the shell 3 and the sample bottle 2. Four groups of permanent magnets 4.

Four groups of vertically placed permanent magnets 4 are placed symmetrically in pairs in each group, and each group of the four groups of permanent magnets 4 is composed of four permanent magnets 4 that attract each other. The permanent magnets 4 are in the shape of columns.

The shape of the sample bottle 2 is a cuboid, and the outer periphery of the sample bottle 2 forms a corresponding gap with the shell 3, which is convenient for placing the permanent magnet 4.

The sample bottle 2 is made of acid-resistant non-magnetic metal or non-metallic material. The material of the sample bottle 2 can be one of polytetrafluoroethylene, PVC, and PP.

The shell 3 is made of polytetrafluoroethylene.

Describe working principle of the present utility model below in conjunction with embodiment and working process:

The utility model mainly utilizes the magnetic principle of impurities, and adopts an adsorption device composed of a 500ml cuboid large-mouth sample bottle 2, a 500ml polytetrafluoroethylene shell 3, a columnar permanent magnet 4 (4000GS), and a three-dimensional mixer to adsorb the magnetic substances in the EMD. Finally, separation/collection, cleaning and detection are carried out to obtain the results of the magnetic substance content of EMD products.

The working principle of the utility model is: disperse the EMD powder in the aqueous solution, use the device composed of the sample bottle 2, the permanent magnet 4, and the shell 3, stir through the three-dimensional mixer, absorb the magnetic substance in the suspension, and use acetic acid and hydrogen peroxide Cleaning the magnetic substance, dissolving the magnetic substance with acid, and testing the content of each element of the magnetic substance with a plasma emission spectrometer in the obtained filtrate.

The specific operation method: clean the inner surface of the sample bottle 2 and the bottle cap 1 with hydrochloric acid, put them into the shell 3 with four mutually attracting columnar permanent magnets 4 arranged side by side in advance at the bottom, and then place the gap between the sample bottle 2 and the shell 3 around the sample bottle 2 Two groups of permanent magnets 4 are placed symmetrically and vertically in pairs, and each group of these four groups of permanent magnets 4 is made up of four permanent magnets 4 that attract each other. Then put the EMD into the sample bottle 2, add distilled water, tighten the bottle cap 1, put it into a three-dimensional mixer, let the EMD and distilled water mix for 30 minutes; pour out the mixture of EMD and water in the bottle, and rinse the sample with distilled water Inner wall of bottle 2 several times, until there is no obvious granular EMD in the bottle, then add the mixture of acetic acid and hydrogen peroxide, tighten the bottle cap 1, shake the sample bottle 2 up and down, so that the remaining EMD in the bottle can fully react with the mixture of acetic acid and hydrogen peroxide Pour out the mixed solution of acetic acid and hydrogen peroxide, then rinse with distilled water for several times, tighten the bottle cap 1, take out the permanent magnet 4 around the sample bottle 2, transfer the magnetic substance in the bottle to a 300ml beaker completely, add acid Dissolve magnetic substances; use ICP to measure Fe, Co, Cr, Ni, Co, Cu, Mo, Zn and other metal elements in the solution, and the sum of each element is the amount of magnetic substances.

Claims (8)

1. a kind of for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, it is characterised in that: including sample bottle (2), bottle cap (1), permanent magnet (4), shell (3) and three-dimensional mixer, the three-dimensional mixer and shell (3) cooperate, the bottle Lid (1) and sample bottle (2) screw cooperation, and sample bottle (2) is placed in shell (3), the bottom of shell (3) lay flat there are four it is attracting Permanent magnet (4), be placed with four groups of permanent magnets (4) vertically in the gap of shell (3) and sample bottle (2) periphery.

2. according to claim 1 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: the described four groups permanent magnets (4) placed vertically are every group symmetrically placed two-by-two.

3. according to claim 1 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: every group of four groups of permanent magnets (4) is made of four attracting permanent magnets (4).

4. according to claim 1 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: the shape of the sample bottle (2) is cuboid.

5. according to claim 1 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: the material of the sample bottle (2) is the nonmagnetic metal or non-metallic material of acid corrosion-resistant.

6. according to claim 5 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: the material of the sample bottle (2) is one of polytetrafluoroethylene (PTFE), PVC, PP.

7. according to claim 1 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: the shape of the permanent magnet (4) is column.

8. according to claim 1 for separating and collecting the device of the magnetisable material in electrolytic manganese dioxide, feature exists In: the material of the shell (3) is polytetrafluoroethylene (PTFE).