Process and equipment for recycling and pretreating positive electrode material of waste lithium ion battery

Abstract

The invention discloses a waste lithium ion battery positive electrode material recovery pretreatment process and equipment, and relates to the technical field of lithium ion battery recovery treatment.The process comprises the steps that 1, a waste lithium ion battery is split and smashed, and a lithium-containing waste material is obtained; 2, carbon powder and concentrated sulfuric acid are added into the lithium-containing waste for curing; step 3, crushing the cured solid material, uniformly stirring the completely crushed powder, and roasting the powder at the roasting temperature of 600 DEG C for 2 hours; 4, the roasted material is cooled, the cooling temperature ranges from 60 DEG C to 80 DEG C, and the cooled material is packaged; according to the method, the crushed lithium-containing waste is added with the carbon powder to be stirred and mixed, the concentrated sulfuric acid is added to be stirred, and high-temperature curing is carried out, so that continuous production treatment of lithium carbonate of the lithium-containing waste on a large scale can be carried out, and the treatment of the lithium-containing waste is low in energy consumption, low in cost, high in treatment efficiency and small in pollution.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery recycling and processing, in particular to a recycling pretreatment process and equipment for waste lithium ion battery positive electrode materials. Background Art

[0002] The recycling of used lithium-ion batteries is an important environmental protection and resource reuse process, which aims to recover valuable materials from used batteries and reduce environmental pollution. Lithium-ion batteries contain precious metals such as lithium, cobalt, nickel, and manganese. Improper disposal can cause serious damage to the environment. Therefore, it is necessary to recycle used lithium-ion batteries. The recycling of these materials can not only save resources, but also reduce the negative impact on the environment, especially reducing the emission of heavy metals and harmful substances.

[0003] For the treatment of waste lithium-ion batteries, the commonly used processes are hydrometallurgy and pyrometallurgy.

[0004] The wet direct acid leaching route uses a high amount of acid to leach out all components. Combined with an oxidant, iron and phosphorus can be precipitated and recovered in the form of FePO4, and then a high amount of alkali is added to precipitate and recover lithium in the form of Li2CO3 or Li3PO4. However, the FePO4 precipitate formed first has fine grains and will carry a large amount of lithium. It can only be washed with a large amount of water, and then a low-concentration lithium-containing solution is produced, which is difficult to recover economically. This approach faces the problems of difficulty in removing impurities such as aluminum and copper, low lithium recovery rate, large amount of acid and alkali, large amount of salt-containing wastewater and washing water, and secondary pollution of ammonia-containing wastewater. The process is relatively complicated and the cost is high.

[0005] Fire reduction smelting can efficiently recover valuable metals in waste lithium-ion batteries. At the same time, the high-temperature reduction characteristics of negative electrode carbon and metal aluminum in waste lithium batteries can replace traditional reducing agents to achieve metallization reduction of cobalt, copper and iron oxides in high-temperature smelting processes. However, the use of fire-based processes often has disadvantages such as high energy consumption, high pollution and low resource utilization.

[0006] Therefore, the existing conventional wet treatment process is difficult to achieve selective leaching of lithium, the obtained leachate contains many impurity metals, the subsequent purification cost is high, the process is long, and the lithium loss is large. The existing conventional pyrometallurgical treatment technology has problems such as excessive carbon emissions, high energy consumption, and high pollution. To this end, we propose a pretreatment process and equipment for the recovery of waste lithium-ion battery positive electrode materials. Summary of the invention

[0007] The purpose of the present invention is to provide a recycling pretreatment process and equipment for waste lithium-ion battery positive electrode materials, which can effectively solve the problems raised in the background technology.

[0008] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a pretreatment process for recycling waste lithium-ion battery positive electrode materials, comprising the following steps: Step 1: disassemble and crush the waste lithium-ion batteries to obtain lithium-containing waste; Step 2, adding carbon powder and concentrated sulfuric acid to the lithium-containing waste for aging: adding carbon powder to the lithium-containing waste and stirring and mixing for 30 minutes, then adding 98% concentrated sulfuric acid after treatment and performing high-temperature reaction treatment at a temperature of 150°C-180°C for 8 hours to obtain a solid material; Step 3: crush the matured solid material, stir the crushed powder evenly, and then roast the powder at a temperature of 600°C for 2 hours; Step 4: Cool the calcined material at a temperature of 60°C-80°C, and package the cooled material.

[0009] Preferably, in step 2, the mesh size of the carbon powder used is 200-325 meshes, and the amount of carbon powder added is 200 kg of carbon powder per ton of lithium waste.

[0010] Preferably, in step 2, the concentrated sulfuric acid is added at a flow rate of 0.1 m 3 / h-0.15m 3 / h, the amount of concentrated sulfuric acid added is 400Kg-450Kg per ton of lithium waste, The recycling pretreatment equipment of waste lithium-ion battery positive electrode materials includes a raw material processing system for crushing and feeding waste lithium-ion raw materials, a vertical mixing bin arranged at the discharge end of the raw material processing system and used for mixing materials, a maturation kettle arranged at the discharge end of the vertical mixing bin and used for maturation of materials, a weighing buffer bin connected to the discharge end of the maturation kettle, a rotary kiln arranged at the discharge end of the weighing buffer bin, a cooling cylinder arranged at the discharge end of the rotary kiln, and a clinker bagging and baling machine arranged at the discharge end of the cooling cylinder; A first stirring device for mixing materials is fixedly installed inside the vertical mixing bin, a second stirring device for mixing materials and concentrated sulfuric acid is fixedly installed inside the aging kettle, a spray device for spraying concentrated sulfuric acid is fixedly installed on the inner top of the aging kettle, a roller crusher is fixedly installed at the discharge end of the aging kettle, and a stirring assembly is provided at one end of the weighing buffer bin.

[0011] Preferably, the raw material processing system includes a plate chain conveyor, a clamping device arranged at the discharge end of the plate chain conveyor, a bag breaking device arranged on the side below the clamping device, a vibrating screen arranged on one side of the bag breaking device, and a second tube chain conveyor arranged on one side of the vibrating screen, wherein the second tube chain conveyor is used to transport the crushed material to the interior of the vertical mixing bin.

[0012] Preferably, a first weighing sensor is fixedly installed at the upper end of the vertical mixing bin, and a first ball valve is fixedly provided at the bottom discharge end of the vertical mixing bin.

[0013] Preferably, a third pipe chain conveyor is provided between the vertical mixing bin and the maturation kettle, and the third pipe chain conveyor is used to convey the material at the discharge end of the first ball valve into the interior of the maturation kettle.

[0014] Preferably, a second ball valve is fixedly provided at the bottom discharge end of the aging kettle, and the roller crusher is located at the discharge end of the second ball valve.

[0015] Preferably, it also includes a first tube chain conveyor for introducing the material in the aging kettle into the weighing buffer bin, and a tail gas treatment system for treating waste gas, wherein the tail gas treatment system is used to collect and purify the flue gas generated during the operation of the equipment.

[0016] The present invention has the following beneficial effects: 1. The process used in the present invention uses lithium-containing waste obtained by splitting and crushing waste lithium-ion batteries as raw materials, and prepares a mixture of lithium-containing waste, concentrated sulfuric acid and carbon powder in proportion. The mixture is reacted and matured to obtain solid clinker. After the clinker is crushed and then roasted, PVDF and carbon black are removed, and the material is dried. Finally, the processed material is cooled and bagged for transfer, and the lithium-containing waste is recovered and pre-treated. This process uses less concentrated acid and can pre-produce lithium carbonate from lithium-containing waste in large quantities through continuous production. It solves the problem that it is difficult to achieve selective leaching of lithium in the conventional wet method for treating waste lithium-ion batteries, there are many impurity metals in the obtained leachate, the subsequent impurity removal and purification cost is high, the process is long, and the lithium loss is large. It also solves the problems of excessive carbon emissions, high energy consumption and large pollution in the conventional pyrometallurgical method for treating waste lithium-ion batteries.

[0017] 2. The present invention adds carbon powder to the crushed lithium-containing waste material, stirs and mixes it, adds concentrated sulfuric acid to stir it and performs high-temperature aging, and the amount of concentrated acid used in the processing process is small. The equipment can continuously produce and process lithium carbonate from lithium-containing waste material in large quantities.

[0018] 3. The equipment used in the present invention has low energy consumption, low cost, high processing efficiency and low pollution for the treatment of lithium-containing waste materials, which solves the problems of difficult selective leaching of lithium in conventional wet treatment of waste lithium-ion batteries, high impurity metals in the obtained leachate, high cost of subsequent impurity removal and purification, long process and large lithium loss. It also solves the problems of excessive carbon emissions, high energy consumption and high pollution in conventional pyrometallurgical treatment of waste lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 This is a flow chart of the pretreatment process for recycling the positive electrode material of waste lithium-ion batteries of the present invention; Figure 2 It is a schematic diagram of a production line of a waste lithium-ion battery positive electrode material recovery and pretreatment equipment of the present invention; Figure 3 A plan view of a raw material processing system of the waste lithium-ion battery positive electrode material recovery pretreatment equipment of the present invention; Figure 4 It is a plan view of the raw material processing system, the vertical mixing bin and the aging kettle of the waste lithium-ion battery positive electrode material recovery pretreatment equipment of the present invention and the structures arranged thereon; Figure 5 It is a plan view of the structure of the vertical mixing bin of the waste lithium-ion battery positive electrode material recovery and pretreatment equipment of the present invention; Figure 6 It is a plan view of the structure of the aging kettle of the waste lithium-ion battery positive electrode material recovery and pretreatment equipment of the present invention; Figure 7 It is a plan view of the structure of the weighing buffer bin of the waste lithium-ion battery positive electrode material recovery and pretreatment equipment of the present invention; Figure 8 The present invention is a plan view of the cooling cylinder, rotary kiln and weighing buffer storage structure of the waste lithium-ion battery positive electrode material recovery and pretreatment equipment.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 001, raw material processing system; 002, vertical mixing bin; 003, aging kettle; 004, first tube chain conveyor; 005, bagging and baling machine; 006, cooling cylinder; 007, rotary kiln; 008, weighing and buffering bin; 009, tail gas treatment system; 010, plate chain conveyor; 011, clamping device; 012, bag breaking device; 013, vibrating screen; 014, second tube chain conveyor; 015, first stirring device; 016, first weighing sensor; 017, first ball valve; 018, third tube chain conveyor; 019, spraying device; 020, second ball valve; 021, roller crusher; 022, stirring assembly; 023, second weighing sensor; 024, third ball valve; 025, screw conveyor; 026, second stirring device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example

[0024] See also Figure 1 - Figure 8 As shown, the pretreatment process for recycling the positive electrode material of waste lithium-ion batteries includes the following steps: Step 1: disassemble and crush the waste lithium-ion batteries to obtain lithium-containing waste; Step 2, adding carbon powder and concentrated sulfuric acid to the lithium-containing waste for aging: adding carbon powder to the lithium-containing waste and stirring and mixing for 30 minutes, then adding 98% concentrated sulfuric acid after treatment and performing high-temperature reaction treatment at a temperature of 150°C-180°C for 8 hours to obtain a solid material; Step 3: crush the matured solid material, stir the crushed powder evenly, and then roast the powder at a temperature of 600°C for 2 hours; Step 4: Cool the calcined material at a temperature of 60°C-80°C, and package the cooled material.

[0025] The raw material used in the present invention has a bulk density of 1.1-1.2 g / cm 3 ; Tap density: 2-3g / cm 3 ; Moisture content: about 0.5%; Particle size: larger than 100 mesh 1.875%, 100-200 mesh 26.675%, smaller than 200 mesh 71.45%.

[0026] Based on this process, the raw material is lithium-containing waste obtained by splitting and crushing waste lithium-ion batteries. The lithium-containing waste, concentrated sulfuric acid and carbon powder are mixed in proportion to form a mixture. The mixture is reacted and matured to obtain solid clinker. The clinker is crushed and then roasted to remove PVDF and carbon black, and the material is dried. Finally, the processed material is cooled and bagged for transfer, and the lithium-containing waste is recovered and pre-treated. This process uses less concentrated acid and can pre-produce lithium carbonate from lithium-containing waste in large quantities through continuous production. It solves the problem that it is difficult to achieve selective leaching of lithium in the conventional wet treatment of waste lithium-ion batteries, there are many impurity metals in the obtained leachate, the subsequent impurity removal and purification costs are high, the process is long, and the lithium loss is large. It also solves the problems of excessive carbon emissions, high energy consumption and large pollution in the conventional pyrometallurgical treatment of waste lithium-ion batteries.

[0027] In step 2, the carbon powder used has a mesh size of 200-325, and the amount of carbon powder added is 200 kg of carbon powder per ton of lithium waste. The bulk density of the carbon powder used is 0.8-0.9 g / cm 3 , true density is 1.8-1.95g / cm 3 , apparent density is 0.88-1.08g / cm 3 , bulk density 400-500kg / m 3 .

[0028] Among them, in step 2, the flow rate of concentrated sulfuric acid addition is 0.1m 3 / h-0.15m 3 / h, and the amount of concentrated sulfuric acid added is 400Kg-450Kg per ton of lithium waste.

[0029] The recycling pretreatment equipment of waste lithium-ion battery positive electrode materials comprises a raw material processing system 001 for crushing and loading waste lithium-ion raw materials, a vertical mixing bin 002 arranged at the discharge end of the raw material processing system 001 and used for mixing materials, a maturation kettle 003 arranged at the discharge end of the vertical mixing bin 002 and used for maturation of materials, a weighing buffer bin 008 connected to the discharge end of the maturation kettle 003, a rotary kiln 007 arranged at the discharge end of the weighing buffer bin 008, a cooling cylinder 006 arranged at the discharge end of the rotary kiln 007, and a clinker bagging and baling machine 005 arranged at the discharge end of the cooling cylinder 006; a plurality of maturation kettles 003 are arranged.

[0030] A first stirring device 015 for mixing materials is fixedly installed inside the vertical mixing bin 002, a second stirring device 026 for mixing materials and concentrated sulfuric acid is fixedly installed inside the aging kettle 003, a spray device 019 for spraying concentrated sulfuric acid is fixedly installed on the inner top of the aging kettle 003, a roller crusher 021 is fixedly installed at the discharge end of the aging kettle 003, and a stirring assembly 022 is provided at one end of the weighing buffer bin 008.

[0031] The lithium-containing waste and carbon powder are sent to the vertical mixing bin 002 through the raw material processing system 001. The vertical mixing bin 002 can add 4 tons of materials at a time, and the amount of carbon powder added is: 200 kg of carbon powder per ton of raw materials. The materials are stirred for 30 minutes by the first stirring device 015 to complete the mixing.

[0032] The mixed materials in the vertical mixing bin 002 are transported to the maturation kettle 003, and 98% concentrated sulfuric acid is sprayed into the maturation kettle 003 through the spray device 019. The sulfuric acid flow rate is controlled at 0.1-0.15m 3 / h. At the same time, the temperature in the aging kettle 003 is controlled by the cold water tank on the outer shell of the aging kettle 003 to ensure that the temperature in the aging kettle 003 is between 150℃ and 180℃. The materials in the aging kettle 003 are mixed evenly by the second stirring device 026. After aging for 8 hours, the second ball valve 020 at the bottom is opened. During the falling process, the materials are crushed by the roller crusher 021. After crushing, the materials are transported to the weighing buffer bin 008 through the first pipe chain conveyor 004.

[0033] After the material enters the weighing buffer bin 008, it is stirred and mixed by the stirring assembly 022, and the material is weighed by the second weighing sensor 023. The second weighing sensor 023 is fixedly installed at one end of the weighing buffer bin 008. After the weight reaches the set value, the material is discharged through the third ball valve 024, which is fixedly installed at the bottom of the weighing buffer bin 008. The material is transported to the rotary kiln 007 through the screw conveyor 025, which is fixedly installed at the bottom of the third ball valve 024. The roasting temperature in the rotary kiln 007 is 600°C and the time is about 2 hours. After roasting, the material is cooled by the cooling cylinder 006, and the temperature of the material after cooling is 60°C-80°C. After cooling, the material is packaged by the bagging and baling machine 005, and finally transferred and stored by a forklift, completing the entire lithium-containing waste recycling pretreatment operation.

[0034] This equipment adds carbon powder to the crushed lithium-containing waste, stirs and mixes it, adds concentrated sulfuric acid to stir it and performs high-temperature aging, and uses less concentrated acid in the processing process. This equipment can continuously produce and process lithium carbonate from lithium-containing waste in large quantities. This equipment has low energy consumption, low cost, high processing efficiency, and low pollution in the treatment of lithium-containing waste. It solves the problem that it is difficult to achieve selective leaching of lithium in the conventional wet treatment of waste lithium-ion batteries, the obtained leachate contains many impurity metals, the subsequent impurity removal and purification costs are high, the process is long, and the lithium loss is large. It also solves the problems of excessive carbon emissions, high energy consumption, and high pollution in the conventional pyrometallurgical treatment of waste lithium-ion batteries.

[0035] Among them, the raw material processing system 001 includes a plate chain conveyor 010, a clamping device 011 arranged at the discharge end of the plate chain conveyor 010, a bag breaking device 012 arranged on the side below the clamping device 011, a vibrating screen 013 arranged on one side of the bag breaking device 012, and a second tube chain conveyor 014 arranged on one side of the vibrating screen 013. The second tube chain conveyor 014 is used to transport the crushed material to the interior of the vertical mixing bin 002.

[0036] Based on this equipment, the lithium-containing waste and carbon powder used are packaged in ton bags. The production line of the present invention adopts the raw material processing system 001 for loading operations. A forklift is used to place the ton bag on the plate chain conveyor 010. The plate chain conveyor 010 transports the ton bag to the clamping device 011. The clamping claws of the clamping device 011 descend and grab the ton bag, lift the ton bag off the plate chain, and move horizontally to the bag breaking device 012. The clamping claws descend and use the breaking knife to cut the bottom of the ton bag. The material falls to the vibrating screen 013. After vibration screening, it is transported to the vertical mixing bin 002 by the second tube chain conveyor 014 to complete the automatic loading operation of solid powder.

[0037] Among them, a first weighing sensor 016 is fixedly installed on the upper end of the vertical mixing bin 002, and a first ball valve 017 is fixedly provided on the bottom discharge end of the vertical mixing bin 002.

[0038] The amount of lithium-containing waste and carbon powder added is controlled by the first weighing sensor 016. The materials mixed in the vertical mixing bin 002 are discharged from the vertical mixing bin 002 by opening the first ball valve 017 at the bottom.

[0039] A third pipe chain conveyor 018 is provided between the vertical mixing bin 002 and the maturation kettle 003, and the third pipe chain conveyor 018 is used to convey the material at the discharge end of the first ball valve 017 into the interior of the maturation kettle 003. The third pipe chain conveyor 018 guides the material output from the vertical mixing bin 002 into the plurality of maturation kettles 003.

[0040] Among them, a second ball valve 020 is fixedly provided at the bottom discharge end of the aging kettle 003 , and the roller crusher 021 is located at the discharge end of the second ball valve 020 .

[0041] It also includes a first tube chain conveyor 004 for introducing materials in the aging kettle 003 into the weighing buffer bin 008, and an exhaust gas treatment system 009 for treating waste gas. The exhaust gas treatment system 009 is used to collect and purify the flue gas generated during the operation of the equipment. This structure can treat the waste gas generated during the production process and reduce environmental pollution. The first tube chain conveyor 004 introduces all the materials crushed by the roller crusher 021 into the weighing buffer bin 008.

[0042] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pretreatment process for recycling positive electrode materials of waste lithium-ion batteries, characterized by: The following steps are involved: Step 1: disassemble and crush the waste lithium-ion batteries to obtain lithium-containing waste; Step 2, adding carbon powder and concentrated sulfuric acid to the lithium-containing waste for aging: adding carbon powder to the lithium-containing waste and stirring and mixing for 30 minutes, then adding 98% concentrated sulfuric acid after treatment and performing high-temperature reaction treatment at a temperature of 150°C-180°C for 8 hours to obtain a solid material; Step 3: crush the matured solid material, stir the crushed powder evenly, and then roast the powder at a temperature of 600°C for 2 hours; Step 4: Cool the calcined material at a temperature of 60°C-80°C, and package the cooled material.

2. The process for recycling the positive electrode material of waste lithium-ion batteries according to claim 1, characterized in that: In step 2, the mesh size of the carbon powder used is 200-325 mesh, and the amount of carbon powder added is 200 kg per ton of lithium waste.

3. The process for recycling the cathode material of waste lithium-ion batteries according to claim 1, characterized in that: In step 2, the concentrated sulfuric acid is added at a flow rate of 0.1m 3 / h-0.15m 3 / h, the amount of concentrated sulfuric acid added is 400Kg-450Kg per ton of lithium waste, A pretreatment device for recycling positive electrode materials of waste lithium-ion batteries, applied to any one of the processes in claims 1-3, characterized in that it comprises a raw material processing system (001) for crushing and feeding waste lithium-ion raw materials, a vertical mixing bin (002) arranged at the discharge end of the raw material processing system (001) and used for mixing materials, a maturation kettle (003) arranged at the discharge end of the vertical mixing bin (002) and used for maturation of materials, a weighing buffer bin (008) connected to the discharge end of the maturation kettle (003), a rotary kiln (007) arranged at the discharge end of the weighing buffer bin (008), a cooling cylinder (006) arranged at the discharge end of the rotary kiln (007), and a clinker bagging and baling machine (005) arranged at the discharge end of the cooling cylinder (006); A first stirring device (015) for mixing materials is fixedly installed inside the vertical mixing bin (002), a second stirring device (026) for mixing materials and concentrated sulfuric acid is fixedly installed inside the aging kettle (003), a spray device (019) for spraying concentrated sulfuric acid is fixedly installed on the inner top of the aging kettle (003), a roller crusher (021) is fixedly installed at the discharge end of the aging kettle (003), and a stirring assembly (022) is provided at one end of the weighing buffer bin (008).

4. The waste lithium-ion battery positive electrode material recovery and pretreatment equipment according to claim 4 is characterized in that: The raw material processing system (001) comprises a plate chain conveyor (010), a clamping device (011) arranged at the discharge end of the plate chain conveyor (010), a bag breaking device (012) arranged on a side below the clamping device (011), a vibrating screen (013) arranged on one side of the bag breaking device (012), and a second tube chain conveyor (014) arranged on one side of the vibrating screen (013), wherein the second tube chain conveyor (014) is used to convey the crushed material to the interior of the vertical mixing bin (002).

5. The waste lithium-ion battery positive electrode material recovery and pretreatment equipment according to claim 4 is characterized in that: A first weighing sensor (016) is fixedly mounted on the upper end of the vertical mixing bin (002), and a first ball valve (017) is fixedly disposed on the bottom discharge end of the vertical mixing bin (002).

6. The waste lithium-ion battery positive electrode material recovery and pretreatment equipment according to claim 6 is characterized in that: A third pipe chain conveyor (018) is provided between the vertical mixing bin (002) and the maturation kettle (003), and the third pipe chain conveyor (018) is used to convey the material at the discharge end of the first ball valve (017) into the interior of the maturation kettle (003).

7. The waste lithium-ion battery positive electrode material recovery and pretreatment equipment according to claim 4 is characterized in that: A second ball valve (020) is fixedly provided at the bottom discharge end of the aging kettle (003), and the roller crusher (021) is located at the discharge end of the second ball valve (020).

8. The waste lithium-ion battery positive electrode material recovery and pretreatment equipment according to claim 4 is characterized in that: It also includes a first tube chain conveyor (004) for introducing materials in the maturing kettle (003) into the weighing buffer bin (008), and an exhaust gas treatment system (009) for treating waste gas, wherein the exhaust gas treatment system (009) is used to collect and purify the flue gas generated during the operation of the equipment.

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