Equipment for recycling lithium carbonate from waste ternary lithium battery

Abstract

The utility model relates to equipment for recycling lithium carbonate from a waste ternary lithium battery, and relates to the technical field of waste lithium battery recycling. The equipment comprises a reduction roasting unit, carbonization suction filtration equipment, acid adjustment suction filtration equipment, impurity removal concentration equipment and precipitation suction filtration equipment which are connected in sequence. According to the structural design of the equipment, materials can be subjected to reduction roasting, carbonization suction filtration, acid adjustment suction filtration, impurity removal concentration and precipitation suction filtration, so that other metal impurities such as nickel, cobalt, manganese, aluminum, copper and the like can be removed, and high-purity lithium carbonate can be recovered.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste lithium battery recycling technical field especially is related to a kind of equipment for waste ternary lithium battery recycling lithium carbonate. BACKGROUND

[0002] The rapid development of lithium battery industry makes lithium ion battery widely used. Ternary lithium battery is in great demand in the market due to its large discharge capacity, good safety performance and long cycle life, which leads to a large amount of ternary lithium battery loss and scrap. It is of great significance to carry out harmless treatment and resource recovery on waste ternary lithium battery.

[0003] Waste ternary lithium battery mainly includes positive electrode, negative electrode, electrolyte and binder. Lithium in the positive electrode material has excellent performance and is widely used in electronic, energy and chemical industries, so it has high recycling value. The existing lithium extraction technology (carbonization lithium extraction technology) usually contains a small amount of nickel, cobalt, manganese, aluminum and copper and other metal impurities in the obtained lithium carbonate product, and the purity of lithium carbonate is low. UTILITY MODEL CONTENT

[0004] To solve the above problems, the utility model provides an equipment for waste ternary lithium battery recycling lithium carbonate. The structural design of the equipment can remove nickel, cobalt, manganese, aluminum and other metal impurities by reducing roasting, carbonization filtration, acid adjustment filtration, impurity removal and concentration, and precipitation filtration, and high-purity lithium carbonate can be recovered.

[0005] To achieve the above purpose, the utility model provides an equipment for waste ternary lithium battery recycling lithium carbonate, which comprises a reducing roasting unit, a carbonization filtration device, an acid adjustment filtration device, an impurity removal and concentration device and a precipitation filtration device connected in sequence.

[0006] In one embodiment, the carbonization filtration device comprises a water immersion carbonization device and a filtration device.

[0007] The acid adjustment filtration device comprises an acid adjustment device and a filtration device.

[0008] The impurity removal and concentration device comprises an impurity removal unit and an evaporation device.

[0009] The precipitation filtration device comprises a lithium precipitation device and a filtration device.

[0010] In one embodiment, the reducing roasting unit comprises a tube furnace.

[0011] In one embodiment, the tube furnace is used to reduce and roast the material under a protective atmosphere to obtain roasted material, and the material comprises black powder of waste ternary lithium battery and / or activated carbon.

[0012] In one of the embodiments, the protective atmosphere is an inert gas.

[0013] In one of the embodiments, the temperature of the reduction roasting is 550-650℃, the time is 300-360min, and the inert gas includes argon.

[0014] In one of the embodiments, the water immersion carbonization device is used for water immersion treatment and carbonization of the roasted material to obtain carbonized material.

[0015] The suction filtration device in the carbonization suction filtration equipment is used for suction filtration of the carbonized material to obtain lithium bicarbonate-containing material.

[0016] In one of the embodiments, the water immersion treatment and carbonization include: water immersion treatment of the roasted material while carbonization reaction is carried out by introducing carbon dioxide.

[0017] In one of the embodiments, the solid-liquid ratio of the water immersion treatment is 1:15, the carbon dioxide flow is 150-250mL / min, the reaction time is 1-2h, and the stirring rate is 250-350rpm.

[0018] In one of the embodiments, the acid adjusting device adjusts the pH value of the lithium bicarbonate-containing material by adding sulfuric acid to obtain acid-adjusted material.

[0019] The suction filtration device in the acid-adjusted suction filtration equipment is used for suction filtration of the acid-adjusted material to obtain lithium sulfate-containing material.

[0020] In one of the embodiments, the acid adjusting device adjusts the pH value of the lithium bicarbonate-containing material by adding sulfuric acid to make the pH value ≤4.

[0021] In one of the embodiments, the impurity removal unit is provided with resin, and the impurity removal unit is used for impurity removal of the lithium sulfate-containing material to obtain impurity-removed material.

[0022] The evaporation device in the impurity-removed concentration equipment is used for evaporation concentration of the impurity-removed material to obtain concentrated material.

[0023] The above-mentioned impurity removal unit is beneficial to remove impurities including nickel, cobalt, manganese, copper and aluminum.

[0024] In one of the embodiments, the resin is a chelating resin.

[0025] In one of the embodiments, the lithium precipitation device is used for lithium precipitation reaction of the concentrated material by adding sodium carbonate to obtain lithium-precipitated material.

[0026] The suction filtration device in the precipitation suction filtration equipment is used for suction filtration and washing of the lithium-precipitated material to obtain lithium carbonate.

[0027] The above washing is beneficial to remove dissolved ions such as sodium ions, and high-purity lithium carbonate is obtained, and the purity of the lithium carbonate is greater than or equal to 99.3%.

[0028] In one of the embodiments, before adding sodium carbonate for lithium precipitation reaction, sodium hydroxide is added to the concentrate to adjust the pH value to 12.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The equipment for recycling lithium carbonate from waste ternary lithium batteries of the embodiment, the lithium carbonate product obtained by the traditional carbonization lithium extraction device usually has other metal impurities such as nickel, cobalt, manganese, aluminum and copper, compared with the traditional carbonization lithium extraction device, the equipment of the utility model recycles high-purity lithium carbonate product, the purity of the lithium carbonate is greater than or equal to 99.3%, and the purity of the recycled product is high, and an effective valuable metal recycling scheme is provided for the lithium industry. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view of the equipment for recycling lithium carbonate from waste ternary lithium batteries in the embodiment, wherein 1 is a reduction roasting unit, 2 is a water immersion carbonization device, 3 is a first filter device, 4 is an acid adjusting device, 5 is a second filter device, 6 is a resin impurity removal unit, 7 is an evaporation device, 8 is a sodium carbonate lithium precipitation device, and 9 is a third filter device. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] Source:

[0036] The reagents, materials and equipment used in this embodiment are commercially available unless otherwise specified. The experimental methods are conventional experimental methods in the art unless otherwise specified.

[0037] Embodiment

[0038] An apparatus for recycling lithium carbonate from waste ternary lithium batteries.

[0039] The apparatus comprises a reduction roasting unit 1, a water immersion carbonization device 2, a No. 1 suction filtration device 3, an acid adjusting device 4, a No. 2 suction filtration device 5, a resin impurity removal unit 6, an evaporation device 7, a sodium carbonate lithium precipitation device 8, and a No. 3 suction filtration device 9 connected in sequence.

[0040] In this embodiment, the main body of the reduction roasting unit 1 is a tubular furnace.

[0041] II. The working process of the apparatus for recycling lithium carbonate from waste ternary lithium batteries.

[0042] The mixed waste ternary lithium battery black powder and activated carbon are added into the tubular furnace, and reduction roasting is carried out under the protection of inert gas to obtain roasted materials. In this embodiment, the reduction roasting temperature is 600°C, the time is 300 min, and the inert gas is argon.

[0043] The roasted materials are subjected to water immersion treatment in the water immersion carbonization device 2, and carbonation reaction is carried out by introducing carbon dioxide to obtain carbonized materials. In this embodiment, the solid-liquid ratio of the water immersion treatment is 1:15, the carbon dioxide flow rate is 200 mL / min, the reaction time is 1 h, and the stirring rate is 300 rpm.

[0044] The carbonized materials are transferred to the No. 1 suction filtration device 3 for suction filtration to obtain materials rich in lithium bicarbonate.

[0045] The materials rich in lithium bicarbonate are transferred to the acid adjusting device 4, and sulfuric acid is added to adjust the pH value to 3.5 to obtain acid-adjusted materials.

[0046] The acid-adjusted materials are transferred to the No. 2 suction filtration device 5 for filtration to obtain materials containing lithium sulfate.

[0047] The materials containing lithium sulfate are transferred to the resin impurity removal unit 6 for impurity removal to remove impurities including nickel, cobalt, manganese, copper and aluminum to obtain impurity-removed materials. In this embodiment, the resin impurity removal unit 6 uses chelating resin.

[0048] The impurity-removed materials are transferred to the evaporation device 7 for evaporation concentration to obtain concentrated materials.

[0049] The concentrated materials are transferred to the sodium carbonate lithium precipitation device 8, sodium hydroxide is added to adjust the pH value to 12.0, and sodium carbonate solution is added for reaction to obtain lithium precipitation materials.

[0050] The lithium-precipitated material is transferred to the No. 3 suction filter device 9 for filtration, and the filter cake is washed with water to remove sodium ions and other dissolved ions, thereby obtaining high-purity lithium carbonate.

[0051] The device of the utility model is used for recycling valuable metals from waste ternary lithium batteries. The device is used as follows: firstly, the waste ternary lithium battery black powder and carbon powder are mixed uniformly and then put into the reduction roasting unit 1 for reduction roasting, so that the metals in the waste ternary lithium battery black powder are reduced to corresponding metal valence states; the roasting product is put into the water immersion carbonization device 2 for water immersion while carbon dioxide is introduced, so that lithium is converted into soluble lithium bicarbonate; the obtained filtrate is added with sulfuric acid to adjust the pH, so that the lithium bicarbonate is converted into lithium sulfate; after the acid adjustment is completed, the filtrate is introduced into the No. 2 suction filter device 5; the filtrate is introduced into the resin impurity removal unit 6 to remove other metal impurities such as nickel, cobalt, manganese, aluminum and copper; the water outlet of the resin is introduced into the evaporation device 7 for evaporation and concentration; the concentrated solution is transferred to the sodium carbonate lithium precipitation device 8, sodium hydroxide is added to adjust the pH, and then sodium carbonate solution is added for reaction; the solid-liquid mixture after the lithium precipitation reaction is introduced into the No. 3 suction filter device 9, and the filter cake is washed synchronously, thereby obtaining high-purity lithium carbonate.

[0052] The lithium carbonate product obtained by the traditional carbonization lithium extraction device usually contains other metal impurities such as nickel, cobalt, manganese, aluminum and copper. Compared with the traditional carbonization lithium extraction device, the device of the utility model can recover high-purity lithium carbonate product, and the purity of the lithium carbonate is greater than or equal to 99.3%. The product recovered by the device has high purity, and an effective valuable metal recovery scheme is provided for the lithium battery industry.

[0053] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict each other, they should be considered as falling within the scope of the present disclosure.

[0054] The above-described embodiments only express several implementation manners of the utility model, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An apparatus for recovering lithium carbonate from a spent ternary lithium battery, comprising: The device is composed of a reduction roasting unit, a water leaching carbonization device, a filtration device, an acid adjusting device, a filtration device, a resin impurity removal unit, an evaporation device, a lithium precipitation device and a filtration device connected in sequence. The reduction roasting unit comprises a tubular furnace.

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