Recycling method for waste tire pyrolysis residues

Abstract

The invention provides a recycling method for waste tire pyrolysis residues. The recycling method comprises the following steps: S1, firstly carrying out wire drawing on waste tires; s2, the waste tires obtained after wire drawing are put into a crushing unit to be crushed; s3, the crushed waste tires are added into a pyrolysis processor; s4, carrying out water cooling on solid slag generated by pyrolysis of the old tire to obtain a primary carbon black material; s5, mixing the black primary material and a desulfurizing agent according to the mass; s6, washing: adding the crude carbon black into a granulating agent, and washing in a washing solution; s7, granulation: conveying the carbon black slurry into a granulator through a screw conveyor, extruding, forming and discharging; and S8, drying and discharging. S9, compounding the dried and discharged carbon black with water, a water reducing agent and cement; and S10, vibrating, stirring and forming.

Description

Technical Field

[0001] The present invention belongs to the field of resource utilization of solid waste and the technical field of regeneration of pyrolysis slag produced by pyrolysis of waste tires, and specifically relates to a resource utilization method of pyrolysis slag of waste tires. Background Art

[0002] The reasons why the amount of waste tires generated is large and the recycling of carbon black is imperative can be summarized as follows: With the improvement of my country's economic level and the popularization of transportation, the number of cars has increased rapidly, resulting in an increase in the number of scrapped tires.

[0003] There are five main ways to recycle waste tires: (1) directly used as fenders at port terminals; (2) crushing waste tires to make rubber powder; (3) pyrolysis of waste tires to obtain oil, carbon black, combustible gas and steel wire; (4) making waste tires into recycled rubber; (5) directly burning waste tires to generate electricity. Among them, pyrolysis is a technology that completely decomposes waste tires into various usable resources. It has the characteristics of large processing capacity, high efficiency and low environmental pollution. It is more in line with the principles of resource utilization, harmlessness and reduction of waste treatment, and is therefore considered to be one of the best ways to recycle waste tires. Combustible gas, pyrolysis oil, pyrolysis charcoal and steel wire can be obtained after pyrolysis of waste tires. Among them, the pyrolysis slag of waste tires is generally processed into carbon black for industrial use. Since the carbon black regenerated from traditional methods has poor purity and low tensile strength, it cannot be used as a modified additive in cement composites.

[0004] At present, there is no patent published on the use of waste tire pyrolysis residues in cement composite materials after purification. The carbon black treated by this method has the characteristics of high purity and good tensile strength, and can be used as an additive in the preparation of cement composite materials. This method is a very good method to solve the problem of insufficient resource utilization of pyrolysis residues in the domestic market. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a method for recycling waste tire pyrolysis slag.

[0006] The method for recycling waste tire pyrolysis residues of the present invention comprises the following steps: Step 1: The waste tires first enter the wire drawing unit through the feed port of the integrated device, and the wires in the waste tires are pulled out by the wire drawing unit. The wire drawing set in this device is different from the traditional wire drawing unit. The wire drawing is designed as a reel-type wire drawing, and the wires are directly packaged after collection; Step 2: Put the waste tires after drawing into the crushing unit for crushing, and connect the discharge port of the feed crushing unit with the feed port of the pyrolysis processor; Step 3: Add the crushed waste tires into the pyrolysis processor, and perform pyrolysis treatment on the crushed waste tires through the pyrolysis processor; pyrolysis produces pyrolysis oil, pyrolysis gas, and pyrolysis residue; the pyrolysis gas is burned after storage, and the combustion heat energy is used for heating the pyrolysis device and other heat-using equipment.

[0007] Step 4: transport the solid slag generated by the pyrolysis of waste tires to the discharging unit. A water cooling jacket is provided on the discharging unit. The solid slag entering the discharging unit is cooled by the water cooling jacket to reduce the temperature of the solid slag to 30-80°C; Step 5: Mix the carbon black raw material and the desulfurizer in a mass ratio of 1-3:0.3-0.5, adjust the temperature to 100-200°C for 10-20s, and then cool it to room temperature to obtain crude carbon black; Step 6: Take the crude carbon black and add it to the granulating agent and washing liquid. The washing liquid is prepared by lignin, alcohol and tap water. Put the mixed solution into the mixer for stirring. After stirring for a period of time, a carbon black slurry can be obtained. Step 7: conveying the carbon black slurry prepared in step 6 to a granulator through a screw conveyor, and extruding and molding the material; Step 8: Put the material extruded in the drying step into a dryer for drying. After drying for a period of time, take it out for use.

[0008] Step nine: put the prepared carbon black, water 1-10 to 1-30, water reducer 1-0.3 to 1-0.5, cement 1-70 to 1-100 into the mixing drum from the feed inlet in sequence; Step 10: After stirring for 30 to 35 minutes, the composite material is sent into a vibration cylinder and vibrated for 3 to 5 minutes to remove bubbles in the composite material in the vibration cylinder, thereby completing the preparation of the cement-based composite material containing carbon black.

[0009] Compared with the prior art, the beneficial effects are: The present invention uses a relatively low temperature to pyrolyze waste tires to obtain a relatively high proportion of pyrolysis oil and a relatively low proportion of pyrolysis non-condensable gas, and simultaneously obtains pyrolysis carbon black with high reinforcement performance and high cleanliness by deep processing solid pyrolysis residue, thereby ensuring economic benefits and improving the quality of pyrolysis carbon black.

[0010] The present invention improves the surface activity and structure of thermal cracking carbon black by subjecting the pretreated pyrolysis slag to high-temperature heating treatment, desulfurization pretreatment, washing treatment, extrusion discharging, etc., and the purity is also greatly improved. The thermal cracking carbon black prepared by this process has good reinforcement performance, high color strength, good dispersibility and the like, and can be used as an additive in the preparation of cement-based composite materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is a process flow chart for recycling waste tire pyrolysis slag in an embodiment of the present invention.

[0013] Figure 2 This is a diagram of an integrated device for recycling waste tire pyrolysis slag in an embodiment of the present invention. Its reference numerals are: 1-feeding device, 2-wire drawing unit, 3-waste wire collecting device, 4-crusher, 5-pyrolysis processor, 6-pyrolysis processor heating tube, 7-pyrolysis oil collecting device, 8-pyrolysis gas collecting tube, 9-water cooling jacket, 10-discharging unit, 11-desulfurization agent adding facility, 12-desulfurization kettle, 13-feeding device, 14-mixer, 15-screw conveyor, 16-granulator, 17-dryer, 18-feeding device, 19-mixing drum, 20-vibration drum. DETAILED DESCRIPTION

[0014] See also Figure 2The waste tire first enters the wire drawing unit 2 through the feeding port of the feeding device 1, and the wire drawing unit is used to pull out the iron wire in the waste tire. The wire drawing arranged in this device is different from the traditional wire drawing unit. A reel-type wire drawing waste iron wire collection device 3 is designed, which can be directly packaged and sold after collection. The waste tire after wire drawing is put into the crusher 4 for crushing, and the feeding and crushing unit discharge port is connected with the feeding port of the pyrolysis processor 5; the pyrolysis processor is equipped with a pyrolysis processor heating pipe 6, and the crushed waste tire is pyrolyzed by the pyrolysis processor; the pyrolysis oil generated by pyrolysis is collected in the pyrolysis oil collection device 7, and the pyrolysis gas is collected in the pyrolysis gas collection pipe 8 and then burned, and the residual heat is used for heating the pyrolysis device. The solid residue generated by the pyrolysis of waste tires is transported to the discharging unit 10. A water cooling jacket 9 is provided on the discharging unit. The solid residue entering the discharging unit is cooled by the water cooling jacket. After the solid residue is cooled to 30-80°C, the carbon black initial material and the desulfurizer are added to the desulfurization kettle 12 according to a certain proportion through the desulfurizer adding facility 11. The granulating agent, washing liquid, etc. are added to the mixer 14 through the feeding device 13. The mixer 14 is stirred. After stirring for a period of time, the carbon black slurry can be obtained and further prepared. The obtained carbon black slurry is transported to the granulator 16 through the screw conveyor 15, and extruded to discharge the material. The material extruded by the drying step is placed in the dryer 17 for drying. After drying for a period of time, it is taken out for standby use. The prepared carbon black, water 1-10 to 1-30, water reducer 1-0.3 to 1-0.5, cement 1-70 to 1-100 are sequentially put into the mixing drum 19 from the feeding device 18; after stirring for 30 to 35 minutes, the composite material is sent to the vibration drum 20 for vibration for 3 to 5 minutes to eliminate the bubbles of the composite material in the vibration drum, thereby completing the preparation of the cement-based composite material containing carbon black. Example 1

[0015] About 800 waste tires were drawn into wires, crushed and sent to the pyrolysis kettle for pyrolysis at 750℃ for 30 minutes. The oil-gas mixture, furnace exhaust gas and carbon black were obtained. The oil-gas mixture mainly contained light oil and gas, heavy oil and gas and some tar-like colloid substances. The exhaust gas mainly contained CO, CO2, HC, NO X, water vapor, etc. After the carbon black raw material and the desulfurizer are mixed in a mass ratio of 1:2, the temperature is adjusted to 150℃ for 20s, and then cooled to room temperature to obtain crude carbon black; take the crude carbon black, add granulating agent, washing liquid (the washing liquid contains 1% lignin, 8% alcohol, and the rest is made of tap water), put the mixed solution into a mixer for stirring, and after stirring for a period of time, a carbon black slurry can be obtained; the carbon black slurry prepared above is conveyed to the granulator through a screw conveyor, and after extrusion molding, it is put into the dryer for drying. After drying for a period of time, it is taken out, and finally it can be successfully prepared. The prepared carbon black (1 part) is added with 30 parts of water, 0.5 parts of water reducing agent and 100 parts of cement. The carbon black prepared by the method is used as an additive to enhance the strength and toughness of cement-based materials. At extremely low cost and usage, the flexural strength and compressive strength of cement-based materials are significantly improved. At the same time, the electrical and thermal properties of cement-based materials can be improved. The carbon black itself is non-toxic and harmless, and has good adaptability and compatibility with concrete types and admixture types, and is particularly suitable for industrial, commercial and standardized large-scale production applications. Example 2

[0016] About 800 waste tire wires of the same quality as in Example 1 were crushed and sent to a pyrolysis kettle for pyrolysis at a pyrolysis temperature of 600°C for 35 minutes. Oil-gas mixture, furnace exhaust gas, and carbon black initial material were obtained; the carbon black initial material was mixed with a desulfurizer at a mass ratio of 1:2, and the temperature was adjusted to 150°C for 20 seconds, and then it was cooled to room temperature and a small amount of desulfurizer (mass ratio 10:1) was added again for secondary desulfurization. The temperature and time were controlled the same as the first desulfurization to obtain crude carbon black; crude carbon black was added, granulating agent, washing liquid (the washing liquid contained 2% lignin, 10% alcohol, and the rest was prepared by tap water), and the mixed solution was put into a mixer for stirring for 20 minutes to obtain carbon black slurry; the carbon black slurry prepared above was transported to a granulator through a screw conveyor, and after extrusion molding, it was put into a dryer for drying. After drying for a period of time, it was taken out, and finally it was successfully prepared. The prepared carbon black (1 part) is added with 30 parts of water, 0.5 parts of water reducing agent and 100 parts of cement. The carbon black prepared by the method is used as an additive to enhance the strength and toughness of cement-based materials. At extremely low cost and usage, the flexural strength and compressive strength of cement-based materials are significantly improved. At the same time, the electrical and thermal properties of cement-based materials can be improved. The carbon black itself is non-toxic and harmless, and has good adaptability and compatibility with concrete types and admixture types, and is particularly suitable for industrial, commercial and standardized large-scale production applications. Example 3

[0017] About 800 waste tire wires of the same quality as in Example 1 were crushed and sent to a pyrolysis kettle for pyrolysis at a pyrolysis temperature of 750°C for 30 minutes. Oil-gas mixture, furnace exhaust gas, and carbon black initial material were obtained; the carbon black initial material was mixed with a desulfurizer at a mass ratio of 1:1.5, and the temperature was adjusted to 150°C for 20 seconds. The temperature and time control were the same as the first desulfurization to obtain crude carbon black; crude carbon black was added, granulating agent, and washing liquid (the washing liquid contained 1% lignin, 15% alcohol, and the rest was prepared by tap water), and the mixed solution was placed in a mixer for stirring for 15 minutes to obtain carbon black slurry; the carbon black slurry prepared above was transported to a granulator through a screw conveyor, and after extrusion molding, it was placed in a dryer for drying. After drying for a period of time, it was taken out, and finally it was successfully prepared. The prepared carbon black (1 part) is added with 30 parts of water, 0.5 parts of water reducing agent and 100 parts of cement. The carbon black prepared by the method is used as an additive to enhance the strength and toughness of cement-based materials. At extremely low cost and usage, the flexural strength and compressive strength of cement-based materials are significantly improved. At the same time, the electrical and thermal properties of cement-based materials can be improved. The carbon black itself is non-toxic and harmless, and has good adaptability and compatibility with concrete types and admixture types, and is particularly suitable for industrial, commercial and standardized large-scale production applications.

Claims

1. A method for recycling waste tire pyrolysis slag, characterized in that: It consists of the following steps, Step 1: The waste tires first enter the wire drawing unit through the feed port of the integrated device, and the wire drawing unit is used to pull out the iron wires in the waste tires. The wire drawing set in this device is different from the traditional wire drawing unit. The reel-type wire drawing is designed, and it can be directly packaged after collection; Step 2: Put the waste tires after drawing into the crushing unit for crushing, and connect the discharge port of the feed crushing unit with the feed port of the pyrolysis processor; Step 3: Add the crushed waste tires into the pyrolysis processor, and perform pyrolysis treatment on the crushed waste tires through the pyrolysis processor; pyrolysis produces pyrolysis oil, pyrolysis gas, and pyrolysis slag; the pyrolysis gas is burned after being stored, and the combustion heat energy is used for heating the pyrolysis device and other heat-using equipment; Step 4: transport the solid slag generated by the pyrolysis of waste tires to the discharging unit. A water cooling jacket is provided on the discharging unit. The solid slag entering the discharging unit is cooled by the water cooling jacket to reduce the temperature of the solid slag to 30-80°C; Step 5: Mix the carbon black raw material and the desulfurizer in a mass ratio of 1-3:0.3-0.5, adjust the temperature to 100-200°C for 10-20s, and then cool it to room temperature to obtain crude carbon black; Step 6: Take the crude carbon black and add it to the granulating agent and washing liquid. The washing liquid is prepared by lignin, alcohol and tap water. Put the mixed solution into the mixer for stirring. After stirring for a period of time, a carbon black slurry can be obtained. Step 7: conveying the carbon black slurry prepared in step 6 to a granulator through a screw conveyor, and extruding and molding the material; Step 8: Put the material extruded in the drying step into a dryer for drying, and take it out for use after drying for a period of time; Step nine: put the prepared carbon black, water 1-10 to 1-30, water reducer 1-0.3 to 1-0.5, cement 1-70 to 1-100 into the mixing drum from the feed inlet in sequence; Step 10: After stirring for 30 to 35 minutes, the composite material is sent into a vibration cylinder and vibrated for 3 to 5 minutes to remove bubbles in the composite material in the vibration cylinder, thereby completing the preparation of the cement-based composite material containing carbon black.

2. A method for recycling waste tire pyrolysis slag according to claim 1, characterized in that: The mass ratio of the additive, the heat transfer medium and the tire fragments in the step three is 1:1:100-120; the turning speed of the rotary kiln is adjusted within the range of 0.5-4.5 rpm.

Images