Process for converting and recycling carbon black from waste tires and rubber and plastic products

Abstract

The invention relates to the technical field of environmental protection, in particular to a process for converting waste tires and rubber and plastic products into recovered carbon black, which comprises the steps of raw material cutting, material crushing, iron removal treatment, thermal conversion treatment, heat exchange treatment, crushing and iron removal treatment, wet granulation and high-temperature drying treatment. According to the invention, through an accurate process, regenerated oil and combustible gas generated by the thermal conversion system are controllable, so that the combustible gas can be completely used for the thermal conversion furnace and heat required in a carbon black high-temperature drying process is recovered. In the process of high-temperature treatment of waste tires and rubber and plastic products, not only can the content of dioxin in the recovered carbon black be reduced, but also the content of polycyclic aromatic hydrocarbon can be reduced to the European Union export requirement in the thermal conversion process. The process system provided by the invention can provide a crushing technology with relatively high productivity of a single crusher and a drying technology with relatively high productivity of a single drying machine, so that the labor cost is saved, the production cost is reduced, and the economic benefit of carbon black recovery is improved.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a process for converting and recycling carbon black from waste tires and rubber and plastic products. Background Art

[0002] With the continuous development of industry, especially the development of automobile tire industry, the amount of waste garbage - waste tires and rubber and plastic products has gradually increased. The main ways to recycle conventional waste tires and rubber and plastic products are to produce rubber powder and regenerated rubber and to produce recycled carbon black through pyrolysis and deep processing. Among them, the recycling of carbon black is recognized as the most valuable treatment method. It can not only produce recycled carbon black with high added value, but also produce fuel oil and waste steel wire. These materials can be reused, thereby reducing the use of materials such as coal fossils. It is a perfect treatment method that can make the most of waste tires and rubber and plastic products. According to statistics, the global recycled carbon black market size has reached US$492 million in 2023, and is expected to grow to US$656 million in 2024, and is expected to soar to US$3.979 billion by 2030, with an annual compound growth rate of up to 34.8%. This significant growth is mainly due to the wide application of recycled carbon black in rubber and plastic products, coatings and inks, and its huge potential as a sustainable substitute for traditional carbon black. With the improvement of subsequent processing technology, the quality of recycled carbon black can further meet the use standards of tire companies, reduce the amount of petroleum-based and coal-based carbon black, and reduce tire production costs. In addition, it also reduces CO2 emissions, which is in line with national carbon reduction and carbon neutrality policy orientations. In short, the recycling and comprehensive utilization level of waste tires is one of the important indicators of a country's economic development.

[0003] In recent years, the main research work on the treatment of waste tires and rubber and plastic products by pyrolysis is still on how to improve the oil yield of waste tires and the purity of steel wire, reduce the chlorine content of fuel oil and the calorific value of cracked coke residue, but ignores the quality of recycled carbon black raw materials. In addition, during the heat treatment of waste tires and rubber and plastic products, the treatment temperature is basically between 300 and 500 ° C. At this temperature, dioxins are easily produced. At the same time, the surface of the recycled carbon black raw materials after heat treatment will also be accompanied by a high level of polycyclic aromatic hydrocarbons. These substances will cause harm to the environment and human health, and also limit the export of domestic tires and rubber products. Therefore, with the decline in fuel oil and coal prices in recent years, the price of cracking oil has continued to decline, and the price of steel wire has also gradually declined. The added value of the recycled carbon black raw materials produced is low, resulting in a significant reduction in corporate profits and difficulties in operation, so that a large number of cracking manufacturers have reduced production or even closed down.

[0004] Chinese patent CN107379322A discloses a tire carbon black recycling method, which includes pre-processing and crushing waste tires to a size of 25mm*25mm, sending them to a pyrolysis tower at a temperature of 500℃-700℃ and a slightly negative pressure environment for pyrolysis, mixing the pyrolysis carbon black with nitric acid at 343K for 2h, washing with water to a pH of ≥5, drying the filtrate at 378K to constant weight, adding a mixed solution of stearic acid and acetone and standing for 24 hours, and finally drying to constant weight and granulating or directly packaging. The carbon black can 100% replace N550 and N234 carbon black for new tire manufacturing. This modification not only increases the process complexity, increases the cost of equipment and raw materials, but also generates additional wastewater and waste residue treatment costs, and has poor overall economic efficiency and is difficult to promote.

[0005] In view of this, the present invention provides a process for converting waste tires and rubber and plastic products into recycled carbon black, so as to improve the product quality of the recycled carbon black, such as optimizing particle strength, increasing product mesh number, etc., while reducing the content of dioxins and polycyclic aromatic hydrocarbons in the recycled carbon black and improving the application value of the recycled carbon black. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a process for converting waste tires and rubber and plastic products into recycled carbon black, which improves the product quality of recycled carbon black, produces high value-added recycled carbon black, reduces waste, and optimizes production costs.

[0007] A process for converting and recycling carbon black from waste tires and rubber and plastic products, comprising:

[0008] S1. Raw material cutting: After the recycled waste rubber and plastic products and waste tires are carefully picked and cleaned, they are cut and crushed to obtain rubber blocks, which are then classified and stored;

[0009] S2. Material crushing: The cut rubber blocks are conveyed into a grinding machine through a conveying device to obtain rubber powder. After the rubber powder is cooled by a cooling system, the temperature is controlled within 70°C for storage;

[0010] S3, iron removal treatment: the ground rubber powder is subjected to magnetic separation to remove the iron wire produced by grinding;

[0011] S4, thermal conversion treatment: the material is conveyed to the thermal conversion system through a screw feeder, and the material is conveyed to the thermal conversion furnace, and combustible oil is generated for storage and reuse, and the combustible oil is directly conveyed to the thermal conversion furnace and the high-temperature drying system for recovering carbon black, and the high-temperature waste heat is conveyed to the heat exchange system;

[0012] S5. Heat recovery treatment: The process water generated when the recovered carbon black is cooled is transported to the heat exchange system, and heat exchange with the high-temperature waste heat generated by the heat converter can obtain high-temperature steam, which provides insulation for the equipment of the recovered carbon black granulation system. The waste steam after use is transported to the process water tank;

[0013] S6, crushing and iron removal treatment: high-quality crude carbon black is transported to the crusher through negative pressure conveying, crushed and then passed through the iron removal system to obtain recycled carbon black powder raw materials;

[0014] S7, wet granulation: transport the recycled carbon black powder raw material and process water to the granulation system for wet granulation according to a certain ratio;

[0015] S8, high temperature drying: The wet granules produced by granulation are transported to the drying system for drying and dehydration, and then transported to the finished product silo after cooling; the exhaust gas of the high temperature drying system is then treated by the environmental protection system and meets the emission standards.

[0016] Preferably, the mixing ratio of rubber powder to coarse carbon black is (0.5-5):1.

[0017] Preferably, in step S4, the equipment temperature of the heat conversion system is 600-1000°C.

[0018] Preferably, the cooling system cools the obtained high-quality crude carbon black to a temperature of ≤70°C.

[0019] Preferably, in step S5, the heat exchange system can transport the hot water obtained by cooling the crude carbon black and the high-temperature exhaust gas generated by the heat conversion system to the waste heat boiler for heat exchange, thereby obtaining steam with a pressure ≥0.5Mpa. The exhaust gas after heat exchange is discharged after bag dust removal, desulfurization and denitrification treatment.

[0020] Preferably, in step S6, the pulverizer can pulverize high-quality coarse carbon black to a particle size of D97≤30 μm, and the pulverizing capacity of a single pulverizer is 0.5 to 5 t / H.

[0021] Preferably, the stirring system prepares the binder process water required for the back-end wet granulation process, and the required hot water comes from the cooling system and the heat exchange system; wherein the binder used is at least one of sodium lignin sulfonate, starch, yellow dextrin, water-soluble phenolic resin, guar gum, sodium carboxymethyl cellulose, xanthan gum, water-based polyamide, honey, sucrose, and glucose.

[0022] Preferably, step S4 also includes a heating system, which transports the combustible oil, combustible gas and high-temperature exhaust gas generated by the heat conversion system to the burner for combustion as required, and then provides heat to the heat conversion furnace and the drying furnace as required.

[0023] Preferably, the granulation system is to convey high-quality carbon black powder and binder process water in a weight ratio of 100:(40-60) to a granulator for granulation, and then directly convey to a dryer for drying.

[0024] The beneficial effects of the present invention are:

[0025] (1) Through precise process design, the output of regenerated oil and combustible gas produced by the thermal conversion system can be controlled by the temperature and processing time of the equipment, so that the combustible gas can be used in the thermal conversion furnace and for the heat support required in the high-temperature drying process of the recovered carbon black.

[0026] (2) During the high-temperature treatment of waste tires and rubber and plastic products, not only can the dioxin content in the recycled carbon black be reduced, but the polycyclic aromatic hydrocarbon content can also be reduced to the EU export requirements during the thermal conversion process.

[0027] (3) The high-temperature exhaust gas generated by the thermal converter is fully utilized to provide the required hot water and steam for the deep processing of recovered carbon black, thereby reducing production costs. At the same time, it provides insulation for the granulation equipment, making the granulator more stable in operation, producing more uniform pellets, and having a pellet strength close to that of traditional carbon black, thereby achieving effective utilization of the exhaust gas.

[0028] (4) A large amount of hot water can be generated in the cooling system of the heat converter to supply the daily water supply and floor heating of the factory area, thus making effective use of the waste heat.

[0029] (5) The process system of the present invention can provide a pulverizing technology with a high production capacity of a single pulverizer and a drying technology with a large production capacity of a single drying machine, thereby saving labor costs, reducing equipment investment costs and product production costs, and improving the economic benefits of recovering carbon black. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Flow chart of the process of the present invention. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, rather than all the embodiments. The components of the embodiment of the present invention described and shown in the drawings here can be arranged and designed in various configurations. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention. If the specific conditions are not specified in the embodiment, it is carried out according to the normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0033] Example 1

[0034] A process for converting and recycling carbon black from waste tires and rubber and plastic products, comprising:

[0035] S1. Raw material cutting: After the recycled waste rubber and plastic products and waste tires are carefully picked and cleaned, they are cut and crushed to obtain rubber blocks, which are then classified and stored. This process uses a double-shaft crusher (model X1500);

[0036] S2. Material crushing: The cut rubber blocks are conveyed into a grinding mill (model DSM-320-10) through a conveying device to obtain rubber powder. After the rubber powder is cooled by a cooling system, the temperature is controlled within 70°C for storage.

[0037] S3. Iron removal: The ground rubber powder is subjected to magnetic separation to remove the iron wire produced by grinding; an iron remover (model RCY-100) is used.

[0038] S4. Thermal conversion treatment: The material is conveyed to the thermal conversion system through a screw feeder, and then to a thermal conversion furnace (model BJHB-LX40). The rubber powder and crude carbon black are mixed in a ratio of 5:1. Combustible gas is generated for storage and reuse. The combustible gas is directly conveyed to the thermal conversion furnace and the high-temperature drying system for recovering carbon black. The high-temperature waste heat is conveyed to the heat exchange system. The temperature of the thermal conversion furnace is 1000°C.

[0039] The heating system transports the combustible oil, combustible gas and high-temperature tail gas generated by the heat conversion system to the burner for combustion as required, and then provides heat to the heat conversion furnace and drying furnace as required. The combustible gas output of the heat conversion furnace is increased, and it is transported to the heat conversion system and high-temperature drying system for heating; the generated recycled oil can be used as auxiliary heating, and the excess recycled oil is sold. The output of recycled oil is about 45% of the amount of waste rubber products or tires processed. The amount of recycled oil used in the entire system itself is about 7.6% of the amount of waste rubber products or tires processed. The output of recycled oil sold is about 37.4% of the amount of waste rubber products or tires processed.

[0040] S5. Heat recovery treatment: The cooling system cools the obtained fine crude carbon black to a temperature of ≤70°C to prevent spontaneous combustion during storage; the process water generated during the cooling of the recovered carbon black is transported to the heat exchange system (model ZHCH10000), and heat exchange with the high-temperature waste heat generated by the heat converter can obtain high-temperature steam, which provides insulation for the recovered carbon black granulation system equipment, and the used waste steam is transported to the process water tank;

[0041] The heat exchange system can transport the hot water obtained by cooling the crude carbon black and the high-temperature tail gas generated by the heat conversion system to the waste heat boiler for heat exchange, thereby obtaining steam with a pressure ≥ 0.5 MPa. The tail gas after heat exchange is discharged after bag dust removal, desulfurization and denitrification treatment;

[0042] The high-temperature tail gas generated by the thermal converter is fully utilized to provide the required hot water and steam for the deep processing of recovered carbon black, reducing production costs and providing insulation effect for the granulation equipment. After the temperature is stable, the granulator can operate more stably, the produced particles are more uniform, and the particle strength can be close to the particle strength of traditional carbon black, achieving effective utilization of waste gas. This technology adds a granulator insulation system to control its temperature between 100-115℃; the process water used for granulation of recovered carbon black is 85℃ hot water, which improves the wetting effect of the recovered carbon black and the granulation rate in the granulator, thereby shortening the residence time in the granulator. The particle strength is basically controlled at: average particle strength ≤30cN, maximum particle strength ≤50cN.

[0043] The stirring system prepares the binder process water required for the back-end wet granulation process, and the required hot water comes from the cooling system and the heat exchange system; the binder includes at least one of sodium lignin sulfonate, starch, yellow dextrin, water-soluble phenolic resin, guar gum, sodium carboxymethyl cellulose, xanthan gum, water-based polyamide, honey, sucrose, and glucose. For example, glucose is used as the raw material to prepare an aqueous solution with a mass percentage of 0.8%.

[0044] S6. Crushing and iron removal: The high-quality crude carbon black is transported to the crusher (model CR1600) through negative pressure conveying, and then passes through the iron removal system after crushing to obtain the recycled carbon black powder raw material; the crusher can crush the high-quality crude carbon black to a particle size of D97≤30μm, and the crushing capacity of a single unit is 0.5~5t / H. The crusher capacity in this technical process can reach 3.5-4.0t / H; while the usual crusher capacity is 1.0-2.0t / h.

[0045] S7. Wet granulation: transport the recovered carbon black powder raw material and process water to the granulation system for wet granulation in a certain proportion; use a granulator (model DGT98).

[0046] The granulation system is to transport high-quality carbon black powder and adhesive process water to the granulator at a weight ratio of 100:40 for granulation, and then directly transport it to the dryer for drying. The process water is an aqueous solution prepared with condensed water from the production line and adhesive, and the concentration is controlled between 0.1% and 1%, and the concentration is adjusted according to the type of adhesive used.

[0047] S8. High-temperature drying: The wet granules produced by granulation are transported to the drying system for drying and dehydration using a dryer (model DGT2040). After cooling, they are transported to the finished product silo and packaged using a granule ton bag packaging machine (model DSZN1000). The exhaust gas from the high-temperature drying system is then treated by the environmental protection system and meets the emission standards.

[0048] A drying technology with a larger single drying capacity for recycled carbon black has been realized. A drum dryer is used, and recycled oil with a higher calorific value and hot gas are used for heating. The capacity can reach 3.5-4.0T / H, while the capacity of a conventional dryer is 1.0-1.5t / h, which reduces production costs and makes the moisture content of the produced products lower and more stable. The moisture content can be controlled within 0.5%, which improves the dispersibility of the product in rubber.

[0049] Example 2

[0050] A process for converting and recycling carbon black from waste tires and rubber and plastic products, comprising:

[0051] S1. Raw material cutting: After the recycled waste rubber and plastic products and waste tires are carefully picked and cleaned, they are cut and crushed to obtain rubber blocks, which are then classified and stored;

[0052] S2. Material crushing: The cut rubber blocks are conveyed into a grinding machine through a conveying device to obtain rubber powder. After the rubber powder is cooled by a cooling system, the temperature is controlled within 70°C for storage;

[0053] S3, iron removal treatment: the ground rubber powder is subjected to magnetic separation to remove the iron wire produced by grinding;

[0054] S4. Thermal conversion treatment: The material is conveyed to the thermal conversion furnace through a screw feeder. The mixing ratio of rubber powder and coarse carbon black is 0.5:1. Combustible gas is generated for storage and reuse. The combustible gas is directly conveyed to the thermal conversion furnace and the high-temperature drying system for recovering carbon black. The high-temperature waste heat is conveyed to the heat exchange system. The temperature of the thermal conversion furnace is 600°C.

[0055] The heating system transports the combustible oil, combustible gas and high-temperature exhaust gas generated by the heat conversion system to the burner for combustion as required, and then provides heat to the heat conversion furnace and drying furnace as required.

[0056] S5. Heat exchange treatment: The cooling system cools the obtained fine crude carbon black to a temperature of ≤70°C to prevent spontaneous combustion during storage; the process water generated when the recovered carbon black is cooled is transported to the heat exchange system, and heat exchange with the high-temperature waste heat generated by the heat converter can obtain high-temperature steam, which provides insulation for the recovered carbon black granulation system equipment, and the used waste steam is transported to the process water tank;

[0057] The heat exchange system can transport the hot water obtained by cooling the crude carbon black and the high-temperature tail gas generated by the heat conversion system to the waste heat boiler for heat exchange, thereby obtaining steam with a pressure ≥ 0.5Mpa. The tail gas after heat exchange is discharged after bag dust removal, desulfurization and denitrification treatment;

[0058] The stirring system prepares the adhesive process water required for the back-end wet granulation process, and the required hot water comes from the cooling system and the heat exchange system; the adhesive includes sodium lignin sulfonate, starch, yellow dextrin, water-soluble phenolic resin, guar gum, sodium carboxymethyl cellulose, xanthan gum, water-based polyamide, honey, sucrose, and glucose.

[0059] S6. Crushing and iron removal: High-quality crude carbon black is transported to the crusher through negative pressure conveying. After crushing, it passes through the iron removal system to obtain the recycled carbon black powder raw material. The crusher can crush the high-quality crude carbon black to a particle size of D97≤30μm, and the crushing capacity of a single unit is 0.5~5t / H.

[0060] S7, wet granulation: transport the recycled carbon black powder raw material and process water to the granulation system for wet granulation according to a certain ratio;

[0061] The granulation system is to transport high-quality carbon black powder and binder process water in a weight ratio of 100:60 to the granulator for granulation, and then directly transport it to the dryer for drying.

[0062] S8, high temperature drying: The wet granules produced by granulation are transported to the drying system for drying and dehydration, and then transported to the finished product silo after cooling; the exhaust gas of the high temperature drying system is then treated by the environmental protection system and meets the emission standards.

[0063] Experimental Example 1

[0064] The heating loss, oil absorption value, iodine absorption value, powder rate, laser particle size D97, average particle hardness, maximum particle strength, dioxin content, and total amount of polycyclic aromatic hydrocarbons of the carbon black recovered in the above embodiments were tested, and the results are shown in Table 1 below.

[0065] Table 1 Comparison of performance of recycled carbon black

[0066] Test items Example 1 Example 2 N660 Commercially available recycled carbon black Heating loss (%) 0.29 0.38 0.54 1.12 <![CDATA[Oil absorption value (10 -5 m 3 / kg)]]> 84 76 83 71 Iodine absorption value (g / kg) 116 108 39 92 Laser particle size D97(um) 9.8 11.6 8.6 26.5 Powder rate (%) 3.6 4.2 5.9 8.9 Average particle hardness (cN) 21 26 23 49 Maximum particle strength (cN) 48 51 49 82 Dioxin content (ng-TEQ / kg) 0.13 0.38 0.19 0.67 Total amount of PAHs (mg / kg) 12.9 15.8 13.6 94

[0067] Table 1 shows that the recovered carbon black in Example 1 and Example 2 of the present invention has a smaller heating loss, and the dioxin content and the total amount of polycyclic aromatic hydrocarbons are lower than those of commercially available recovered carbon black, which is more green and environmentally friendly.

[0068] Experimental Example 2

[0069] In order to compare and illustrate the effects of recycled carbon black on the performance of rubber composite materials in different embodiments, the mechanical properties of the rubber composite materials in the styrene-butadiene rubber formulations of different embodiments were tested according to the following method. The test results are shown in Table 2.

[0070] The specific rubber material is mixed according to the following components in parts by weight: 100 parts of styrene-butadiene rubber (NR), 50.0 parts of N660 (recycled carbon black), 3.0 parts of zinc oxide, 1.0 parts of stearic acid, 1.0 parts of NS, and 1.75 parts of sulfur.

[0071] Table 2 Mechanical properties test table

[0072] Test items Example 1 Example 2 N660 Commercially available recycled carbon black Tensile strength(MPa) 15.9 14.2 16.2 12 Elongation at break (%) 326 363 276 336 100% tensile strength (MPa) 3.3 3.9 3.9 2.9 300% tensile strength (MPa) 12.9 11.7 / 10.5 <![CDATA[Specific gravity of vulcanizate (g / m 3 )]]> 1.142 1.143 1.143 1.142 Tear strength(KN / M) 83 76 72 69

[0073] Table 2 shows that the mechanical properties of the finished product made by the present invention are better than those of commercially available recycled carbon black.

[0074] The present invention integrates waste tire processing, thermal conversion, transportation, waste heat recovery and production of recycled carbon black, effectively solving the problem of dioxins and polycyclic aromatic hydrocarbons generated in recycled carbon black products; fully utilizing the high-temperature tail gas generated by the thermal conversion furnace, providing the required hot water and steam for the deep processing of recycled carbon black, reducing production costs, and providing insulation effect for the granulation equipment, so that the granulator can operate more stably, the produced particles are more uniform, and the particle strength can be close to the particle strength of traditional carbon black, achieving effective utilization of waste gas; a high-quality and stable-performance recycled carbon black is manufactured, and all indicators are comparable to those of traditional coal tar N660 carbon black, effectively solving the application technical problems of recycled carbon black in the fields of tire treads, automobile sealing products, etc.;

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for converting and recycling carbon black from waste tires and rubber and plastic products, characterized in that: The following steps are involved: S1. Raw material cutting: After the recycled waste rubber and plastic products and waste tires are carefully picked and cleaned, they are cut and crushed to obtain rubber blocks, which are then classified and stored; S2. Material crushing: The cut rubber blocks are conveyed into a grinding machine through a conveying device to obtain rubber powder. After the rubber powder is cooled by a cooling system, the temperature is controlled within 70°C for storage; S3, iron removal treatment: the ground rubber powder is subjected to magnetic separation to remove the iron wire produced by grinding; S4, thermal conversion treatment: the material is conveyed to the thermal conversion system through a screw feeder, and the material is conveyed to the thermal conversion furnace, and combustible oil is generated for storage and reuse, and the combustible oil is directly conveyed to the thermal conversion furnace and the high-temperature drying system for recovering carbon black, and the high-temperature waste heat is conveyed to the heat exchange system; S5. Heat recovery treatment: The process water generated during the cooling of the recovered carbon black is transported to the heat exchange system, and heat exchanged with the high-temperature waste heat generated by the heat converter to obtain high-temperature steam, which provides insulation for the equipment of the recovered carbon black granulation system. The waste steam after use is transported to the process water tank; S6. Crushing and iron removal treatment: The high-quality crude carbon black is transported to the crusher by negative pressure conveying, and then subjected to iron removal treatment after crushing to obtain the recycled carbon black powder raw material; S7, wet granulation: transporting the recovered carbon black powder raw material and process water to the granulation system for wet granulation; S8, high temperature drying: The wet granules produced by granulation are transported to the drying system for drying and dehydration, and then transported to the finished product silo after cooling; the exhaust gas of the high temperature drying system is then treated by the environmental protection system and meets the emission standards.

2. The process for converting and recycling carbon black from waste tires and rubber and plastic products according to claim 1 is characterized by: The mixing ratio of rubber powder and coarse carbon black is (0.5-5):

1.

3. The process for converting and recycling carbon black from waste tires and rubber and plastic products according to claim 2 is characterized in that: In step S4, the equipment temperature of the heat conversion system is 600-1000°C.

4. The process for converting and recycling carbon black from waste tires and rubber and plastic products according to claim 3 is characterized by: The cooling system cools the obtained high-quality crude carbon black to a temperature of ≤70°C.

5. The process for converting and recycling carbon black from waste tires and rubber and plastic products according to claim 4 is characterized by: In step S5, the heat exchange system transports the hot water obtained by cooling the crude carbon black and the high-temperature exhaust gas generated by the heat conversion system to the waste heat boiler for heat exchange, thereby obtaining steam with a pressure ≥ 0.5Mpa. The exhaust gas after heat exchange is discharged after bag dust removal, desulfurization and denitrification treatment.

6. The process for converting and recycling carbon black from waste tires and rubber and plastic products according to claim 5 is characterized by: In step S6, the pulverizer pulverizes the high-quality coarse carbon black to a particle size D97≤30 μm.

7. The process for converting and recycling carbon black from waste tires and rubber and plastic products according to claim 6 is characterized by: It also includes a stirring system, which prepares the adhesive process water required for the back-end wet granulation process, and the hot water required in the preparation process comes from the cooling system and the heat exchange system; wherein the adhesive used is at least one of sodium lignin sulfonate, starch, yellow dextrin, water-soluble phenolic resin, guar gum, sodium carboxymethyl cellulose, xanthan gum, water-based polyamide, honey, sucrose, and glucose.

8. The process for recycling carbon black from waste tires and rubber and plastic products according to claim 7 is characterized by: Step S4 also includes a heating system, which transports the combustible oil, combustible gas and high-temperature exhaust gas generated by the heat conversion system to the burner for combustion as required, and then provides heat to the heat conversion furnace and the drying furnace as required.

9. The process for recycling carbon black from waste tires and rubber and plastic products according to claim 8, characterized in that: The granulation system is to convey high-quality carbon black powder and binder process water to a granulator in a weight ratio of 100: (40-60) for granulation, and then directly convey to a dryer for drying.

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