Waste tire treatment process

Abstract

The invention provides a waste tire treatment process, and solves the problems that an existing waste tire treatment method comprises landfill, incineration and reclaimed rubber production, during landfill and incineration, the environment is harmed, waste gas and waste rubber are generated, and underground water is polluted; and the reclaimed rubber produced by using the waste tires has the defects of high energy consumption and heavy pollution, and can be widely applied to the field of waste tire recovery. The method specifically comprises the following steps that foreign matter checking is conducted on the waste tires, and pure waste tires are obtained; the method comprises the following steps: crushing pure waste tires, and then carrying out magnetic separation to obtain separated steel wires and rubber powder; cracking the rubber powder to obtain crude carbon black, fuel oil and non-condensable gas; the preparation method comprises the following steps: modifying crude carbon black to obtain modified crude carbon black; carrying out magnetic separation on the modified crude carbon black to obtain pure crude carbon black; grinding the pure coarse carbon black to obtain superfine carbon black powder with low ash content; and performing finished product processing on the superfine carbon black powder.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste tire recycling, and particularly relates to a waste tire treatment process. Background Art

[0002] Traditional methods for treating waste tires are landfill, incineration, and production of reclaimed rubber. When landfilling and incinerating, it will cause harm to the environment, generating waste gas, waste rubber, and polluting groundwater; while producing reclaimed rubber from waste tires has the defects of high energy consumption and heavy pollution. Summary of the Invention

[0003] The purpose of the present invention is to solve the above technical deficiencies and provide a waste tire treatment process.

[0004] To this end, the present invention provides a waste tire treatment process, including the following steps:

[0005] S10: Conduct foreign object inspection on waste tires to obtain pure waste tires;

[0006] S20: Crush the pure waste tires, and then conduct magnetic separation to obtain separated steel wires and rubber powder;

[0007] S30: Pyrolyze the rubber powder to obtain crude carbon black, fuel oil, and non-condensable gas;

[0008] S40: Modify the crude carbon black to endow the crude carbon black with certain properties to obtain modified crude carbon black;

[0009] S50: Conduct magnetic separation on the modified crude carbon black to obtain pure crude carbon black;

[0010] S60: Grind the pure crude carbon black to obtain ultra-fine carbon black powder with low ash content;

[0011] S70: Process the ultra-fine carbon black powder into finished products.

[0012] Further, the specific steps of conducting foreign object inspection on waste tires to obtain pure waste tires are as follows:

[0013] Use a metal detector to detect waste tires and set the maximum parameter of the volume of metal objects. When it is detected that the volume of metal objects in the waste tire is greater than the maximum parameter, clean the metal objects from the waste tire.

[0014] Further, set the metal detector at the entrance of the conveyor belt for feeding waste tires, and sequentially scan the waste tires passing on the conveyor belt to screen out the waste tires that meet the detection standards;

[0015] Waste tires will be conveyed to the scanning area of the metal detector through an automated conveyor belt. Each tire passes through the scanning area for no less than 30 seconds to ensure that each tire can be fully scanned without omission; the conveyor belt is equipped with sensors to monitor the feeding status of the tires in real time.

[0016] Furthermore, when metallic substances pass through the scanning area of the metal detector, the sensors of the detector can identify their metal signals; according to the characteristics of the metallic substances such as material, size, shape, and depth, the detector will classify them through different signal processing methods.

[0017] Furthermore, the specific steps for pulverizing pure waste tires are as follows: initially cut the tires using a cutting machine, and then pulverize them through a rubber breaker.

[0018] Furthermore, the specific steps for cracking the rubber powder to obtain crude carbon black, fuel oil, and non-condensable gas are as follows:

[0019] Put the rubber powder chips into the cracking machine. Through heating and high-temperature cracking, the high-molecular compounds in the rubber material are decomposed into smaller molecular structures;

[0020] The non-condensable gas generated during the cracking process is collected through a gas separation device and collected after cooling. The fuel oil generated by cracking is separated into light oil and heavy oil through an oil product separation system.

[0021] Furthermore, the specific steps for modifying the crude carbon black to obtain modified crude carbon black are as follows:

[0022] Use the solid-phase method to place the mixture of crude carbon black and modifier in a reaction kettle within the range of 200 - 300 °C for 5 hours; after the reaction is completed, cool and screen to obtain modified crude carbon black.

[0023] Furthermore, the modifier is selected from one or a combination of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl) phosphite, N-ethyl-2-phenylthiol, N-ethyl-2-phenylthiol, benzotriazole, 2-hydroxy-4-methylphenyl trifluoromethylphenyl vinyl ketone.

[0024] Furthermore, the specific steps for processing the ultrafine carbon black powder into a finished product are as follows:

[0025] Chemically purify the ultrafine carbon black powder; perform secondary modification processing on the purified carbon black powder;

[0026] Granulate and dry the carbon black after secondary modification.

[0027] The present invention provides a waste tire treatment process, which has the following beneficial effects:

[0028] This process can effectively reduce the environmental pollution caused by waste tires. Materials such as rubber, steel wire, and fiber in waste tires are recycled and reused through treatment, reducing the dependence on natural resources, enabling the reuse of resources, and reducing resource consumption. The recycled rubber powder can be used to manufacture new rubber products, such as sports field paving, floor mats, shoe soles, road paving, etc. The recycled steel wire can be used in the metallurgical industry, further realizing the recycling of resources and reducing the energy consumption in the extraction of raw materials and the production process.

[0029] The recycled tire materials can not only be used as raw materials for new products, but also be converted into valuable by-products such as fuel oil and carbon black through pyrolysis technology, further creating economic value. Specific implementation mode

[0030] The following further illustrates the present invention in conjunction with specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0031] The present invention provides a waste tire treatment process, including the following steps:

[0032] I. Foreign object inspection

[0033] A metal detector is set at the entrance of the conveyor belt for feeding waste tires, and the waste tires passing through on the conveyor belt are scanned in sequence to screen out the waste tires that meet the detection standards.

[0034] The waste tires will be conveyed to the scanning area of the metal detector through an automated conveyor belt. Each tire stays in the scanning area for no less than 30 seconds to ensure that each tire can be fully scanned without omission. The conveyor belt is equipped with sensors that can monitor the feeding status of the tires in real time. Once a tire passes through the sensor induction area, the system will automatically activate the metal detector and start scanning the tire. At this time, the magnetic field emitted by the detector will react to the metal substances inside the tire and transmit data to the central control system in real time.

[0035] 1.1 Identification and positioning of metal substances

[0036] When a metallic substance passes through the scanning area of the metal detector, the detector's sensors can identify its metal signal. Based on characteristics such as the material, size, shape, and depth of the metallic substance, the detector classifies it through different signal processing methods. For example: The metal signal of steel wires is usually slightly different from that of other metals, and the detector can identify and accurately locate it. If there are large pieces of metallic substances inside the tire, such as steel belts, steel wires, etc., the detector will emit a strong signal, and the system will mark it as "large piece of metal". For metal particles or smaller metal fragments, the detector determines whether they reach the preset metal volume threshold, and if not, they will not be screened out.

[0037] During this process, through multi-dimensional scanning by high-precision sensors, the metal detector can judge the shape and position of the metal in real time. If the scanned metallic substance is part of the tire surface or tire structure, the detector can accurately identify its position and size and determine whether it needs to be screened out.

[0038] 1.2 Alarm and Automatic Rejection

[0039] When the detector scans a large metallic substance in the tire, the system will immediately issue an alarm and automatically reject the tire containing the metallic substance through a preset mechanism. This process includes:

[0040] Automatic pneumatic device: After the detector emits a signal, the pneumatic device drives the robotic arm through air pressure to push the tire from the normal track to the "waste area".

[0041] Electric push rod system: Through the electric push rod system, the tire detected with metal is quickly pushed off the conveyor belt and into a separate collection area.

[0042] This automated screening and removal process can significantly improve production efficiency, reduce manual operations, and avoid equipment damage or processing problems caused by metallic substances.

[0043] 1.3 Data Recording and Analysis

[0044] Each metal detection process is recorded in the central control system, and the data is transmitted to the central database in real time for subsequent analysis. The recorded data usually includes: the scanning results of the tire (whether there is metal, metal type, position, etc.); the quantity and relevant information of the rejected tires; the volume, type, and quantity of metallic substances.

[0045] Through regular analysis of the data, operators can timely adjust the sensitivity, scanning depth, and other operating parameters of the metal detector, so as to achieve more accurate identification of metallic substances in waste tires and optimize the recycling process.

[0046] II. Tire Shredding

[0047] In one embodiment, a cutting machine is used to initially cut the tire, and then it is pulverized by a rubber breaker. The working principle of the cutting machine is based on mechanical shearing. The tire is conveyed into the cutting machine through a feeding system, and powerful blades cut the tire layer by layer until the tire is cut into appropriate-sized blocks. To improve the cutting efficiency, the blades of the cutting machine are usually made of high-strength alloy steel to ensure that the blades are not easily worn during long-term use.

[0048] During the cutting process, the cutting machine is also equipped with a hydraulic system for adjusting the pressure and position of the blades, so as to achieve the most ideal cutting effect. In addition, the control system of the cutting machine can automatically adjust the cutting parameters according to the type and size of the tire to meet the processing requirements of different waste tires.

[0049] After cutting, the tire has been cut into larger blocks. Then, the rubber breaker further separates the rubber and metal parts inside the tire and finely pulverizes the rubber. The working principle of the rubber breaker usually involves tearing and squeezing the cut tire blocks by a high-speed rotating cutter wheel. In this way, the molecular chains of the rubber are broken, causing the rubber material to be decomposed into smaller particles. At the same time, the metal wires will also be continuously removed to ensure the purity of the final product.

[0050] In the rubber breaker, the cutter wheel is usually made of wear-resistant materials to ensure stability and efficiency during long-term operation. At the same time, the feeding device of the rubber breaker also needs to be automatically adjusted according to the size and hardness of the tire to ensure the smooth operation of the equipment.

[0051] The screening and classification of tire particles are usually processed by a magnetic separator. Through the action of the magnetic separator, the particles containing metal components can be effectively separated. The specific process is as follows: after the tire particles are crushed, using the magnetic field characteristics of the magnetic separator, metal materials (such as steel wires) will be attracted by the magnetic field and separated from the non-metal part (such as rubber particles). This process not only improves the separation efficiency but also ensures the purity of the non-metal and metal components during the subsequent processing, providing a basis for further recycling.

[0052] In one embodiment, the waste tire is directly broken into mixed debris by a rapid disintegrator first, and then the steel wires are separated from the mixed debris by a steel wire separator. The working principle of the rapid disintegrator is to strongly impact the waste tire through rotating blades, rollers, and hammers, destroying the overall structure of the tire. The tire is quickly broken into mixed debris, which contains rubber, steel wires, fibers, and other organic impurities. In this process, the high-temperature operating environment of the rapid disintegrator will effectively reduce the binding between rubber molecules, making the subsequent separation process easier.

[0053] This efficient mechanized processing method has the following characteristics:

[0054] High-efficiency crushing: The quick solution machine can cut waste tires into pieces in an extremely short time, greatly improving the processing speed.

[0055] Low energy consumption: It adopts an intelligent energy control system to automatically adjust the power and processing method according to the characteristics of the tires, achieving the effect of energy conservation and consumption reduction.

[0056] Versatility: In addition to basic tire crushing, the quick solution machine can also achieve differential processing of different types of tires (such as car tires, truck tires, etc.), ensuring the processing quality and efficiency.

[0057] The steel wires in the mixed debris are an important part of waste tire recycling. The steel wire separator can use a strong magnetic field or air flotation technology through physical means to completely separate the steel wires from the rubber debris.

[0058] Magnetic separation: Due to its high magnetism, the steel wires are extracted from the rubber in the steel wire separator through a strong magnetic field. Almost no steel wires are lost in this process, and the integrity of the steel wires is ensured.

[0059] Airflow separation: For smaller metal particles and other impurities, air flotation technology is adopted. By precisely controlling the speed and direction of the airflow, the lighter rubber debris can be effectively separated from the heavier metal components.

[0060] Through the treatment of the steel wire separator, most of the steel wires are completely extracted, and this method will not cause any damage to the steel wires and can be reused. The advantage of this step is high efficiency, precision and environmental protection, meeting the concept of modern green recycling.

[0061] III. Pyrolysis of rubber powder

[0062] Put the rubber powder debris into the pyrolysis machine. After heating and high-temperature pyrolysis, the high-molecular compounds in the rubber material are decomposed into smaller molecular structures. The working principle of the pyrolysis machine is mainly to heat the rubber material to between 500°C and 800°C, so that the carbon, hydrogen, oxygen and other elements in the rubber powder debris react chemically with other trace elements. The pyrolysis reaction will produce crude carbon black, fuel oil and non-condensable gases.

[0063] Crude carbon black: Carbon black is one of the important products in the high-temperature pyrolysis process, with good physical and chemical properties and is widely used in industries such as rubber, plastics, and paints.

[0064] Fuel oil: Fuel oil is an important energy product in the pyrolysis process, mainly composed of lighter and heavier hydrocarbon compounds, with a relatively high calorific value and can be used as fuel for industrial boilers and generator sets.

[0065] Non-condensable gases: Include gases such as hydrogen, methane, ethylene, ethane, and propylene. These gases are not easily condensable and have a certain energy value. By using non-condensable gases as fuel for a combustion generator to generate electricity, it can supplement energy for the entire process flow, reduce resource consumption and pollution emissions, and achieve a green process.

[0066] The non-condensable gases generated during the cracking process are collected through a gas separation device and further processed after cooling. The fuel oil produced by cracking is separated into light oil and heavy oil through an oil separation system. The crude carbon black can be sold as industrial filler or carbon black products after screening and cleaning; the light oil and heavy oil can be used for further energy utilization or chemical processing.

[0067] IV. Carbon Black Treatment

[0068] The crude carbon black is mixed with a modifier to make the crude carbon black have antioxidant properties, and the modified crude carbon black is obtained. The modifier can be one or a combination of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl) phosphite, N-ethyl-2-phenylthiol, N-ethyl-2-phenylthiol, benzotriazole, and 2-hydroxy-4-methylphenyl trifluoromethylphenyl vinyl ketone.

[0069] In one embodiment, the mixture of crude carbon black and modifier is placed in a reaction kettle by the solid-phase method within the range of 200 - 300 °C for 5 hours. After the reaction is completed, it is cooled and screened to obtain the modified crude carbon black.

[0070] The modifier can react with the active sites on the carbon black surface to form a stable surface structure. In this way, the surface of the carbon black can not only better combine with the rubber or plastic matrix, but also enhance its heat resistance and oxidation resistance. Carbon black itself has many unsaturated chemical bonds and active groups, and these groups are prone to react with oxygen, resulting in the oxidative degradation of carbon black and reducing its anti-aging performance. Through the treatment of the modifier, these unstable surface groups can be reduced, and the antioxidant ability of carbon black can be improved.

[0071] The modifier can also enhance the compatibility between carbon black and matrix materials such as rubber and plastic. Through surface modification, carbon black can form better dispersibility and contact with the matrix, thereby improving the performance of the entire material, especially the anti-aging ability under dynamic load.

[0072] The modified crude carbon black is subjected to magnetic separation to screen out metal impurities, and then put into a grinding machine for grinding to form a low-ash ultra-fine carbon black powder with particles of 1000 - 1200 mesh. The ultra-fine carbon black powder is chemically purified and then secondarily modified. The secondarily modified carbon black powder is put into a wet granulator to generate granular carbon black, and then dried by a dryer to remove moisture to produce finished carbon black particles.

[0073] The above are only specific embodiments of the present invention, and thus cannot be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention shall still fall within the scope covered by the claims of the present invention.

Claims

1. A waste tire processing process, characterized in that: The following steps are involved: S10: Check the waste tires for foreign matter to obtain pure waste tires; S20: crushing the pure waste tires, and then performing magnetic separation to obtain separated steel wires and rubber powder; S30: cracking the rubber powder to obtain crude carbon black, fuel oil and non-condensable gas; S40: modifying the crude carbon black to obtain modified crude carbon black; S50: magnetically separating the modified crude carbon black to obtain pure crude carbon black; S60: Grinding the pure coarse carbon black to obtain ultrafine carbon black powder with low ash content; S70: Process the ultra-fine carbon black powder into finished products.

2. The waste tire processing process according to claim 1, characterized in that: The specific steps to check waste tires for foreign matter and obtain pure waste tires are as follows: Use a metal detector to detect waste tires and set a maximum parameter for the volume of metal objects. When the volume of metal objects detected in the waste tires is greater than the maximum parameter, the waste tires are cleaned of metal objects.

3. The waste tire processing process according to claim 2 is characterized in that: A metal detector is set at the entrance of the conveyor belt for waste tires, and the waste tires passing on the conveyor belt are scanned one by one to select the waste tires that meet the detection standards; Used tires are transported to the scanning area of ​​the metal detector via an automated conveyor belt. Each tire takes no less than 30 seconds to pass through the scanning area to ensure that each tire is fully scanned without omission. The conveyor belt is equipped with sensors that can monitor the feeding status of the tires in real time.

4. The waste tire processing process according to claim 3 is characterized in that: When metal objects pass through the scanning area of ​​the metal detector, the detector's sensor can identify its metal signal; according to the material, size, shape, depth and other characteristics of the metal object, the detector will classify it through different signal processing methods.

5. The waste tire processing process according to any one of claims 1 to 4, characterized in that: The specific steps of crushing pure waste tires are: use a cutter to initially cut the tires, and then crush them through a rubber crusher.

6. The waste tire processing process according to claims 1-4, characterized in that: First, the waste tires are directly crushed into mixed debris by a quick-disintegration machine, and then the steel wires are separated from the mixed debris by a wire separator.

7. The waste tire processing process according to claim 1, characterized in that: The specific steps of cracking the rubber powder to obtain crude carbon black, fuel oil and non-condensable gas are as follows: The rubber chips are put into the cracking machine, and after heating and high-temperature cracking, the high molecular compounds in the rubber are decomposed into smaller molecular structures; The non-condensable gas produced during the cracking process is collected by a gas separation device and then collected after cooling. The fuel oil produced by cracking is separated into light oil and heavy oil through an oil separation system.

8. The waste tire processing process according to claim 1, characterized in that: The specific steps of modifying the crude carbon black to obtain the modified crude carbon black are: The crude carbon black and the modifier mixture are placed in a reaction kettle using a solid phase method, and the temperature is within the range of 200-300° C. for 5 hours; after the reaction is completed, the mixture is cooled and sieved to obtain the modified crude carbon black.

9. The waste tire processing process according to claim 8, characterized in that: The modifier is selected from one or a combination of tris(2,4-di-tert-butylphenyl)phosphite, di(2,4-di-tert-butylphenyl)phosphite, N-ethyl-2-phenylmercaptan, N-ethyl-2-phenylmercaptan, benzotriazole, and 2-hydroxy-4-methylphenyltrifluoromethylphenyl ketone.

10. The waste tire processing process according to claim 1, characterized in that: The specific steps for processing ultrafine carbon black powder into finished products are: Chemically purifying the ultrafine carbon black powder; performing secondary modification processing on the purified carbon black powder; The secondary modified carbon black is granulated and dried.