CN116902999A - Ternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method - Google Patents

Abstract

The invention relates to the field of subsequent processing after ternary powder tailing leaching, iron lithium powder tailing leaching and lithium carbonate finished products, specifically a ternary powder/iron lithium powder/lithium carbonate processing method and a waste battery recycling method. The processing method of ternary powder/lithium iron powder/lithium carbonate of the present invention first includes at least one of the following raw materials: (1). Raw materials after leaching of ternary powder in the tail lane; (2). Raw materials after leaching of lithium iron powder in the tail lane; (3). Raw materials for lithium carbonate finished products; perform down-payment filtration of at least one of the above raw materials and extract the finished product; slurry the raw materials that have completed the first press filtration, and process the slurried raw materials for at least a second time Press filtration; and supply the fluid filtered out by secondary pressure filtration into the washing water tank; according to the concentration of the fluid in the washing water tank, it is selected to be used to extract the finished product or as bottom water, which is used for slurrying of the raw materials .

Description

Nternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method

Technical field

The invention relates to the field of subsequent processing of ternary powder tailings, iron lithium powder tailings and lithium carbonate finished products, specifically ternary powder/iron lithium powder/lithium carbonate processing methods and waste battery recycling methods.

Background technique

Currently, the mainstream power batteries used in electric vehicles on the market are generally divided into two types, namely: ternary lithium batteries and lithium iron phosphate batteries; the keywords "ternary lithium" and "lithium iron phosphate" mainly refer to the power batteries Chemical elements of "cathode materials". Ternary lithium refers to lithium batteries using lithium nickel cobalt manganate (Li(NiCoMn)O2) ternary cathode material as the cathode material. This material combines the advantages of lithium cobalt oxide, lithium nickel oxide and lithium manganate to form a three-phase eutectic system of the three materials. Due to the ternary synergistic effect, its comprehensive performance is better than any single combination compound. Lithium iron phosphate refers to a lithium-ion battery that uses lithium iron phosphate as the cathode material; it is characterized by the fact that it does not contain precious metal elements such as cobalt, the price of raw materials is low, and the resources of phosphorus and iron are abundant in the earth.

As the new energy industry becomes more and more mature, on the one hand, the demand for ternary and iron-lithium is increasing, and on the other hand, the original old waste batteries are increasing day by day; in order to meet the needs of new battery production, as well as The secondary recycling of used batteries is to save resources. A large part of the ternary and iron lithium currently used is extracted from the recycling of used batteries. The recovery and extraction process for ternary and iron lithium in used batteries is to first peel off external accessories such as solder joints and insulation sheets, and then use mechanical or chemical methods to peel off the internal constant voltage terminals (i.e. metal buttons). After stripping, for ternary batteries, vacuum extraction or high-temperature pyrolysis is generally used to extract the electrolyte; for iron-lithium batteries, mechanical crushing, water washing, ultrasonic extraction, etc. are generally used to extract the electrolyte. As well as the separation of positive and negative electrode materials, for ternary batteries, pickling, pyrolysis and other methods can be used to separate positive and negative electrode materials; for lithium iron batteries, mechanical separation is generally used for separation. The finally separated positive and negative electrode materials can be further recycled.

Ternary lithium materials are scarce due to scarcity and are rising with the rapid development of electric vehicles. Their prices are high and they are highly restricted by upstream raw materials. This is a characteristic of ternary lithium at present. Lithium iron phosphate, because it uses a lower ratio of rare/noble metals and is mainly cheap and abundant iron, is cheaper than ternary lithium batteries and is less affected by upstream raw materials.

Among them, the technical routes for recycling waste batteries are divided into three types: physical, fire and wet methods.

The wet recovery of ternary materials is to dissolve the metal in the form of ions in the solution, then add the corresponding metal salts appropriately according to the proportion of nickel, cobalt, and manganese elements in the ternary material to be synthesized, and then add alkali to precipitate the metal co-precipitate. The obtained precipitate is mixed with lithium carbonate in proportion and sintered into a regenerated ternary material. Ternary powder tailing leaching is a method of extracting lithium ions from ternary materials, which is usually used to recover rare metals in discarded lithium batteries. Specifically, this process is to crush and grind used lithium batteries, and then use certain chemicals to dissolve the lithium ions in the leachate. Finally, through a series of steps such as reduction, precipitation, filtration, and drying, high-purity lithium compounds are extracted from the leachate. This method can recover a variety of rare metals, including cobalt, nickel, etc. However, the disadvantages are also obvious, such as the low lithium content in the leachate and the need for a large amount of evaporation energy.

Lithium iron powder tailpipe leaching is a technology that extracts iron ions from used lithium iron batteries. The specific method is similar to the ternary powder tailing leaching, that is, the waste batteries are first ground and pulverized, and then chemicals such as acids or alkali are used to dissolve the iron ions in the leachate, and finally through reduction, precipitation, filtration, drying, etc. This step extracts iron compounds with higher purity from the leachate. However, this method also has some problems and challenges. For example, the process of this method is complex, requires a large amount of energy and chemicals, and is prone to pollution during the operation, causing adverse effects on the environment.

Wet recovery of lithium iron phosphate: After using strong acid to dissolve the positive electrode piece, add alkali to precipitate and separate the lithium, iron ions and phosphate ions in the solution, then adjust according to the recovery ratio, and obtain regenerated lithium iron phosphate after high-temperature roasting Lithium Iron Phosphate.

Lithium carbonate is an important lithium salt material, widely used in batteries, glass manufacturing, metallurgy, ceramics, medicine and other industries. But the same existing process is complicated.

Contents of the invention

The purpose of the present invention is to solve at least part of the above existing problems and bring corresponding beneficial effects.

In order to solve the above technical problems, the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention first includes at least one of the following raw materials:

(1). Raw materials after leaching of ternary powder;

(2). Raw materials after leaching of lithium iron powder tailpipe;

(3). Raw materials for lithium carbonate finished products;

Pumping at least one of the above raw materials into one end of the conveyor belt;

A first filter tank, a second filter tank and a third filter tank are arranged below the conveyor belt, and the slots of the first filter tank, the second filter tank and the third filter tank are respectively against each other. Connect to the lower surface of the conveyor belt;

The raw materials are driven by the conveyor belt to pass through the surfaces of the first filter tank, the second filter tank and the third filter tank in sequence;

wherein the first filter tank and the second filter tank are connected to an external suction filter component; wherein the third filter tank is connected to an external hot air generating device;

When the raw material passes through the first filter tank, the raw material is suction filtered for the first time using the suction filtration component and the first filter tank, and the filtered fluid is supplied to the first tank; when the raw material passes through When the second filter tank is used, the suction filtration component and the second filter tank are used to suction-filter the raw materials for a second time, and at the same time, the raw materials are sprayed, and the filtered fluid is supplied to the second tank. Tank; when the raw material passes through the third filter tank, the hot air generating device and the third filter tank are used to provide heat to the raw material;

Extract the finished product from the fluid in the first tank;

The graphite powder in the raw material is collected at the other end of the conveyor belt.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, waste batteries are disassembled and the raw materials are obtained;

Add water to the raw material to form a slurry, and add acid to react;

The raw material after the reaction is completed is pumped into the conveyor belt.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, the fluid in the second tank is used as bottom water for the slurrying by adding water.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, hot water is sprayed during the spraying.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, the hot air generating device and the third filter tank provide heat to the raw material and collect the evaporated hot steam. ; And transport the collected hot steam to the condensation device and input it into the second tank.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, it includes the following two parts or at least one of them:

(1). The angle of the spray is vertical downward spray or inclined angle spray;

(2). During spraying, the raw materials are turned synchronously through the stirring component.

The ternary powder/lithium iron powder/lithium carbonate processing method of the present invention first includes at least one of the following raw materials:

(1). Raw materials after leaching of ternary powder;

(2). Raw materials after leaching of lithium iron powder tailpipe;

(3). Raw materials for lithium carbonate finished products;

Perform down payment filtration of at least one of the above raw materials and extract the finished product;

Slurry the raw materials that have completed the first press filtration, and perform at least a second press filtration on the slurried raw materials; and supply the fluid from the second press filtration into a washing tank;

According to the concentration of the fluid in the washing water tank, it is selected to be used to extract the finished product or as bottom water, which is used for slurrying of the raw materials.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, waste batteries are disassembled and the raw materials are obtained;

Add water to the raw material to form a slurry, and add acid to react;

The raw material after the reaction is completed is pumped into the conveyor belt.

As a preferred embodiment of the ternary powder/lithium iron powder/lithium carbonate processing method of the present invention, the raw material is slurried again after a second filter press, and is filtered at least three times, and then the three filter presses are The exiting fluid is supplied to the washing tank and used for slurrying before secondary filtering.

The waste battery recycling method of the present invention at least includes the ternary powder/lithium iron powder/lithium carbonate processing method described in any one of the above.

beneficial effects

From the perspective of those skilled in the art, the beneficial effects that are obvious based on the technical solutions of the present invention will not be described in detail below. Therefore, the following beneficial effects are not all, but only part of them.

The present invention solves the above existing problems and other existing problems not mentioned one by one above, and accordingly brings at least the following innovative advantages:

1. The ternary powder/lithium iron powder/lithium carbonate processing method and the waste battery recycling method of the present invention are by feeding the raw materials after leaching the ternary powder tailpipe or the raw materials after leaching the iron lithium powder tailpipe or the finished lithium carbonate raw materials into the conveyor belt, And through the first extraction of the first filter tank on the conveyor belt, the second suction filtration and spraying of the second filter tank, and the heat supply of the third filter tank, not only the pressure filtration of the raw materials is completed, but also the efficiency is improved. The efficiency of raw material extraction and drying of raw materials are completed at the same time, and the combination of the above steps results in a high raw material extraction rate; as well as high efficiency of bagging and transportation of solid raw materials and low labor costs.

2. In the ternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method of the present invention, the fluid in the second tank is used as bottom water for the slurrying process by adding water. It not only saves the additional water supply for slurrying existing raw materials, but also indirectly saves the processing volume of subsequent processes; at the same time, fluids with low concentration can be continued to be used without waste.

3. In the ternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method of the present invention, the hot air generating device and the third filter tank provide heat to the raw materials and collect the evaporated hot steam. ; And transport the collected hot steam to the condensation device and input it into the second tank, so that on the one hand, the drying of the raw material is improved, and on the other hand, the water in the raw material is collected and input into the second tank to continue Use, further improve the utilization rate.

4. The ternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method of the present invention, by spraying at a vertical downward angle or at an inclined angle, so that the raw materials can be sprayed more fully .

5. The ternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method of the present invention, during spraying, the raw materials are synchronously turned by the stirring component, so that the raw materials are turned during the spraying process, so that the raw materials are turned over. The degree to which the raw materials are sprayed can be further improved. And after the stirring component turns the raw materials, spraying can be used to maintain a uniform thickness of the raw materials on the surface of the conveyor belt.

6. The ternary powder/lithium iron powder/lithium carbonate processing method and waste battery recycling method of the present invention, by subjecting at least one of the above raw materials to a down payment press filter and extracting the finished product; completing the first press filter The raw materials are slurried, and the slurried raw materials are subjected to at least two press filtrations; the fluid filtered out by the second press filtration is supplied to a washing water tank; selected according to the concentration of the fluid in the washing water tank to extract the finished product Or as bottom water, the bottom water is used for slurrying the raw materials, thus achieving the same effect of high extraction efficiency and water saving.

Description of the drawings

Figure 1 is a flow chart of the present invention;

Figure 2 is an improved flow chart of area "A" in Figure 1.

In the picture: 1. Spray parts, 2. Exhaust parts, 3. Air hood, 4. Condensation device, 5. Stirring parts, 6. Leveling plate, 7. Unloading port, 8. Collection bucket, 9. Conveyor belt, 10. Transfer roller, 11. Filter screen, 12. First filter tank, 13. Second filter tank, 14. Third filter tank, 15. First tank, 16. Second tank, 17. Washing water tank .

Detailed ways

In order to make the purpose, technical solutions and advantages of the technical solutions of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of specific embodiments of the present disclosure.

Like reference numbers in the drawings represent like parts. It should be noted that the described embodiments are some of the embodiments of the present disclosure, rather than all of the embodiments.

Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present disclosure.

Example 1

The ternary powder/lithium iron powder/lithium carbonate processing method of the present invention first includes at least one of the following raw materials:

(1). Raw materials after leaching of ternary powder;

(2). Raw materials after leaching of lithium iron powder tailpipe;

(3). Raw materials for lithium carbonate finished products;

It should be noted that the present invention is only applicable to the finished products of ternary powder and/or lithium iron powder and/or lithium carbonate after completion of tail leaching;

Refer to Figure 1, and pump or put at least one of the above three raw materials into one end of the conveyor belt 9; the conveyor belt

As shown in Figure 1, a first filter tank 12, a second filter tank 13 and a third filter tank 14 are provided below the conveyor belt 9, and the first filter tank 12, the second filter tank 13 are The slots of the third filter tank 14 and the third filter tank 14 are respectively in contact with the lower surface of the conveyor belt 9; the raw materials are driven by the conveyor belt 9 to pass through the first filter tank 12 and the second filter tank in sequence. 13 and the surface of the third filter tank 14;

The first filter tank 12 and the second filter tank 13 are connected to an external suction filtration component; the third filter tank 14 is connected to an external hot air generating device; the suction filtration component and the hot air generating device are in It is not drawn in the drawings, but those skilled in the art will understand that the suction filtration component is a negative pressure suction device, in which the hot air generating device is an existing hot air blowing device, such as a hot air fan, etc.; the hot air generating device is directly or through The pipe indirectly connects the first filter tank 12 and the second filter tank 13; the air-entraining generating device is also connected to the third filter tank 14 directly or indirectly through the pipe.

As shown in Figure 1, the conveyor belt 9 is provided with a conveyor roller 10 at least at the turning point, and the conveyor belt 9 is preferably a grid structure, and also has a filter 11 on the surface of the conveyor belt. When the raw material is pumped or poured into the conveyor belt At the moment of 9, the raw material undergoes solid-liquid separation, and most of the liquid flows into the first filter tank 12; and when the raw material passes through the first filter tank 12, the suction filter component and the first filter tank 12 are used to pump the raw material for the first time. The raw material is filtered, and the suction-filtered fluid is supplied to the first tank 15 . When the raw material passes through the second filter tank 13, the raw material is filtered twice by using the suction filtration component and the second filter tank 13, and at the same time, the raw material is sprayed and the suction filter is The fluid is fed into the second tank 16, so that only the solid raw material remains above the conveyor belt 9. When the raw materials pass through the third filter tank 14, the hot air generating device and the third filter tank 14 are used to provide heat to the raw materials, so that on the one hand, the solid raw materials are dried to form dry graphite powder. ; On the other hand, the liquid of the raw material is extracted through the wind generating device.

Referring to the foregoing, as shown in Figure 1, the fluid in the first tank 15 is extracted into finished products; that is, the metals in the liquid are extracted and purified;

Referring to Figure 1, the raw materials are placed on the left side of the conveyor belt 9 in the figure. After passing through the surfaces of the first filter tank 12, the second filter tank 13 and the third filter tank 14, the raw materials are transported to the right side of the conveyor belt 9. The conveyor belt The right side of 9 is the discharge port 7, where a collection bucket 8 is provided; thus, the solid raw material graphite powder in the raw material is collected at the other end of the conveyor belt 9.

The first tank 15 and the second tank 16 are preferably mother liquor storage tanks.

As shown in Figure 1, the raw materials mentioned above refer to dismantling used batteries and obtaining the raw materials; that is, the raw materials produced after crushing, screening, magnetic separation, etc. of used power batteries; and then The raw materials are slurried by adding water and reacted with acid; finally, the raw materials after the reaction are pumped into the conveyor belt 9 .

As shown in Figure 1, the fluid (liquid/water) in the second tank 16 described above has another purpose. Based on the above description: when the raw material passes through the second filter tank 13, the pump is used. The filter component and the second filter tank 13 suction-filter the raw materials for a second time, spray the raw materials at the same time, and supply the suction-filtered fluid to the second tank 16 . Due to the spraying, the metal components in the raw materials can be better separated and flow into the second tank 16. At the same time, the concentration of the metal components in the raw material is reduced by spraying. Therefore, it is preferred to move the second tank 16 The fluid is used as bottom water for slurrying by adding water.

Further, hot water is sprayed during the spraying.

Further, referring to Figure 2, when the hot air generating device and the third filter tank 14 provide heat to the raw material and collect the evaporated hot steam; and transport the collected hot steam to the condensation device 4, and input to the second tank 16.

Figure 2 shows that an exhaust component 2 is provided above the conveyor belt 9 (the third filter tank 14). The exhaust component 2 has an air cover 3. The air cover 3 can at least cover the cross-sectional width of the third filter channel 14; allowing hot air to be generated. The device promotes the evaporation of the raw materials on the conveyor belt 9 by supplying heat to the third filter tank 14, and absorbs and transports the evaporated hot steam to the condensation device 4, converting the hot steam into liquid and transporting it to the second Tank 16.

Example 2

The processing method of ternary powder/lithium iron powder/lithium carbonate in Example 2 includes all the features of Example 1. Figure 1 shows that the hot water is sprayed vertically downward. The difference in Example 2 lies in two point:

1. Referring to Figure 2, the conveyor belt 9 is provided with a stirring component 5 at a position above the second filter tank 13, so that during spraying, the raw materials are turned synchronously through the stirring component 5. As is common sense to those skilled in the art, the stirring component 5 is a stirring blade driven by a motor to rotate, so that the raw materials are turned over during the spraying process, so that the raw materials can be sprayed more fully. There will be a problem of uneven thickness of the stirred raw materials on the conveyor belt 9. At this time, spraying can be used to make the raw materials more uniform on the conveyor belt 9.

2. Refer to Figure 2, keep the above-mentioned spraying at an inclined angle and spray hot water so that the raw materials can be flipped under the impact of the sprayed water. At this time, the raw materials can be further fully used. Being sprayed.

Furthermore, a leveling plate 6 is provided above the conveyor belt 9 at the position of the first filter tank 12 so that the raw materials supplied to the surface of the conveyor belt 9 can maintain a uniform thickness under the action of the leveling plate 6 . And by adjusting the distance between the leveling plate 6 and the conveyor belt 9, the thickness of the raw material on the surface of the conveyor belt 9 can be indirectly adjusted.

Example 3

The ternary powder/lithium iron powder/lithium carbonate processing method of the present invention first includes at least one of the following raw materials:

(1). Raw materials after leaching of ternary powder;

(2). Raw materials after leaching of lithium iron powder tailpipe;

(3). Raw materials for lithium carbonate finished products;

Perform down payment filtration of at least one of the above raw materials and extract the finished product;

It should be noted that the present invention is only applicable to the finished products of ternary powder and/or lithium iron powder and/or lithium carbonate after completion of tail leaching;

Referring to Figure 1, the raw material that has completed the first press filtration is slurried, and the slurried raw material is subjected to at least a second press filtration; and the fluid obtained by the second press filtration is supplied to the washing water tank 17;

According to the concentration of the fluid in the washing water tank 17, it is selected to be used to extract the finished product or as bottom water, which is used for slurrying of the raw materials.

Further, the raw materials are obtained by dismantling used batteries;

Add water to the raw material to form a slurry, and add acid to react;

The raw materials after completing the reaction are pumped into the conveyor belt 9 .

Further, the raw material is slurried again after being filtered twice, and filtered at least three times, and then the fluid filtered out of the three times is supplied to the washing tank 17 and used for the slurry before the second filter press. change. At the same time, Figure 1 also shows that there can be four times of press filtration, in which the fluid extracted from the four times of press filtration can be supplied to the washing water tank 17 and used for slurrying before the three times of press filtration.

Example 4

The waste battery recycling method of the present invention includes some or all of the implementation solutions of the previous embodiments 1 to 3, and uses the solutions of the previous embodiments 1 to 3 to realize waste battery recycling.

"First", "second" and similar words used in the description and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Likewise, similar words such as "a", "an" or "the" do not indicate a quantitative limitation but rather indicate the presence of at least one. "Including" or "includes" and other similar words mean that the elements or objects appearing before "includes" or "includes" cover the elements or objects listed after "includes" or "includes" and their equivalents, and do not exclude others. Component or object. "Up", "down", "left", "right", etc. are only used to express relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention. The protection scope of the present invention is defined by the appended claims. For those of ordinary skill in the art, without exerting creative labor, Below, other embodiments can also be obtained according to the accompanying drawings, and any modifications based on the claims of the present invention are within the protection scope of the present invention.

Claims (10)

1. The ternary powder/lithium iron powder/lithium carbonate processing method is characterized by comprising the following raw materials:

(1) Raw materials after ternary powder tail leaching;

(2) Raw materials after iron lithium powder tail leaching;

(3) Lithium carbonate finished product raw material;

pumping the feedstock of at least one of the above into one end of a conveyor belt;

a first filter tank, a second filter tank and a third filter tank are arranged below the conveyor belt, and the notch of the first filter tank, the notch of the second filter tank and the notch of the third filter tank are respectively abutted against the lower surface of the conveyor belt;

the raw materials sequentially pass through the surfaces of the first filter tank, the second filter tank and the third filter tank under the drive of the conveyor belt;

wherein the first filter tank and the second filter tank are communicated with an external suction filter component; wherein the third filter tank is connected with an external hot air generating device;

when the raw material passes through the first filter tank, the raw material is subjected to first suction filtration by utilizing the suction filtration component and the first filter tank, and suction filtration fluid is supplied to the first tank; when the raw material passes through the second filter tank, the raw material is subjected to suction filtration by using the suction filtration component and the second filter tank for secondary suction filtration, and meanwhile, the raw material is sprayed, and the suction filtration fluid is supplied to a second tank; heating the raw material by using the hot air generating device and the third filter tank when the raw material passes through the third filter tank;

extracting a finished product from the fluid of the first tank;

and collecting graphite powder in the raw materials at the other end of the conveyor belt.

2. The ternary powder/lithium iron powder/lithium carbonate processing method according to claim 1, wherein the waste batteries are disassembled and the raw materials are obtained;

adding water into the raw materials to slurry, and adding acid to react;

pumping the raw materials after the completion of the reaction into the conveyor belt.

3. The ternary powder/lithium iron powder/lithium carbonate processing method of claim 2, wherein the fluid of the second tank is used as bottom water for the water-adding and material-feeding slurrying.

4. A ternary powder/lithium iron powder/lithium carbonate processing method according to claim 1, 2 or 3, wherein hot water is sprayed during spraying.

5. The ternary powder/lithium iron powder/lithium carbonate processing method according to claim 1, 2 or 3, wherein the hot air generating device and the third filter tank supply heat to the raw materials and collect evaporated hot air; and delivering the collected hot vapor to a condensing device and inputting the hot vapor to the second tank.

6. The ternary powder/lithium iron powder/lithium carbonate processing method of claim 1, comprising at least one or two of the following:

(1) The spraying angle is vertical downward spraying or inclined angle spraying;

(2) And during spraying, the raw materials are synchronously turned over by the stirring component.

7. The ternary powder/lithium iron powder/lithium carbonate processing method is characterized by comprising the following raw materials:

(1) Raw materials after ternary powder tail leaching;

(2) Raw materials after iron lithium powder tail leaching;

(3) Lithium carbonate finished product raw material;

performing pay-for-sale filter pressing on at least one of the raw materials and extracting a finished product;

pulping the raw materials subjected to primary filter pressing, and performing at least secondary filter pressing on the pulpified raw materials; and supplying the fluid filtered by the secondary pressure into a water washing tank;

the concentration of the fluid in the wash tank is selected to extract the finished product or as bottom water for slurrying the raw material.

8. The ternary powder/lithium iron powder/lithium carbonate processing method according to claim 7, wherein the waste batteries are disassembled and the raw materials are obtained;

adding water into the raw materials to slurry, and adding acid to react;

pumping the raw materials after the completion of the reaction into a conveyor belt.

9. The ternary powder/lithium iron powder/lithium carbonate processing method according to claim 7, wherein the raw materials are pulpified again after being subjected to secondary pressure filtration, and at least three times of pressure filtration are performed, and the fluid filtered out by the three times of pressure filtration is fed into a water washing tank and used for pulping before the secondary pressure filtration.

10. Waste battery recovery method, characterized in that it at least comprises a ternary powder/lithium iron powder/lithium carbonate processing method according to any one of claims 1 to 6 and/or a ternary powder/lithium iron powder/lithium carbonate processing method according to any one of claims 7 to 9.