Enhance Properties of Reclaimed Carbon

Abstract. The disposal of waste tires has become a substantial environmental challenge attributed to their accumulation and potential hazards. Pyrolysis emerges as viable approach for the valorization tires, into valuable products such pyrolytic char. This carbon-rich char can be effectively used pollutant removal or further processed activated carbon, which is widely utilized in purification catalytic applications. study explores impact pyrolysis temperature zeolite catalyst dosage on yield carbonous materials from degradation derived pyrolysis. Firstly, slow at 500°C 3 hours yielded 60% solid Subsequently, was subjected temperatures varying 600°C 800°C ranging 0 1.5. findings discovered diverse patterns carbon with increasing across temperatures. At 800°C, linear rise 80% 71% noted dosage, coke formation surface catalyst. Conversely, 700°C 600°C, reduced 88% 68% 85% 65%, respectively, potentially due promotion liquid product formation. present research demonstrates significant providing insight optimizing decomposition, tire-derived carbonaceous materials.

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Abstract The closed-loop recycling of spent graphite (SG) anodes is an effective method to reduce resource consumption and address environmental issues. However, the still poor electrochemical performance regenerated anode hinders its recycling. It crucial develop green efficient repair strategies achieve upgraded waste graphite. Here, we propose vapor deposition strategy regenerate (SG). At 900℃, cross-linking reactions are employed construct gradient disordered carbon structures, which surface SG inhibit internal crystal rearrangement, thereby improving initial coulombic efficiency (ICE) anode, enhancing Li+transport performance, cycling stability. (PVDC@G-1) has ICE 91.2% a reversible capacity 392.5mAh/g. After 300 cycles at 1C, specific remains as high 334.5mAh/g. This realizes approach provides unique insights into regulating structure repairing defects, offering new for SG.

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Abstract Pyrolysis is becoming increasingly important in the context of recycling and volume end‐of‐life tires worldwide. Sustainable carbon black (sCB), which produced from pyrolysis oil instead crude oil, recovered (rCB), remaining solid pyrolysis, are promising secondary raw materials for rubber compounds as a substitute industrial fossil resources. This study investigates possibility substituting N550 partially or fully an EPDM (Ethylene Propylene Diene Monomer) sealing compound. rCB contains impurities that affect properties Aging at higher temperatures, presence oxygen studied. The evaluated after heat treatment air different temperatures up to 6 weeks. results show sCB very close material terms its in‐rubber properties. Due impurities, alters cross‐linking density structure polymer‐sulfur network (shift polysulfidic structure). Lower reinforcement also observed, related weaker polymer‐filler (decrease I 3/1 by 3% 43% vCB) filler‐filler interactions. effects more pronounced containing rCB.

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The pyrolysis carbon black (CBp) from waste tires contains zinc, iron, and other metal elements, which have high recycling value. This study proposes a simple method of recovering zinc iron tire-derived CBp to synthesize hydrotalcite-type adsorbents for the treatment anodic dye wastewater. Firstly, zinc-aluminum hydrotalcite (LDH) zinc-iron aluminum (FeLDH) were obtained by leaching ions with an acid solution. As compared LDH, FeLDH shows increased laminate ion arrangement density layer spacing. By calcining LDH at 500 °C, oxides (LDO) (FeLDO) then prepared applied adsorption methyl orange (MO). results demonstrate that maximum capacity LDO FeLDO are 304.9 609.8 mg g−1 pH 4.0, respectively. processes both consistent Langmuir isotherm proposed second-order kinetic model. regeneration performance mechanism also investigated in detail. Regeneration experiments show after three cycles, removal rate MO remains above 80%, while only around 64% first cycle regeneration. work would provide new pathway realize high-value solve contamination

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Continuous carbon material modification reactor and system for enhancing quality and efficiency of modifying carbon materials like carbon black, graphene, etc. The reactor uses a screw conveying device to continuously feed, turn, and process the carbon material inside multiple reactors connected in series. Ozone gas is introduced into each reactor to oxidize the carbon. Adjusting parameters like gas flow rate, screw speed, and reactor count allows optimizing modification quality and yield. The system has separate units for compressing, oxygenating, and ozone generation.

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Recycled carbon black for tires that improves reinforcement properties while maintaining fracture resistance compared to virgin carbon black. The recycled carbon black has specific particle size, surface area, and color characteristics. It is produced by pyrolyzing waste tires and separating out the carbon black. The recycled carbon black has a particle size D90 of 310 nm or less, a nitrogen adsorption surface area of 50-85 m2/g, and a specific tint strength of 55 or more. This allows making tires with better reinforcement properties from recycled carbon black compared to virgin carbon black.

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Preparing high-density and high-strength carbon graphite materials using a short-process that avoids the long cycles and high costs of traditional methods. The key is adding both heterogeneous and homogeneous artificial volatile matter to the green body during roasting. This provides internal pressure as the volatile gases evaporate, aiding sintering and density. It also helps fill pores, reducing mass loss and defects. The heterogeneous volatile matter is mixed with the carbonaceous raw materials, while the homogeneous volatile matter is in the green body.

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A method for preparing high-strength carbon graphite products using a unique process that addresses challenges like raw material availability, graphite anisotropy, and internal cracking during production. The method involves mixing ultrafine carbon powder with a low-temperature asphalt and calcium hydroxide using alcohol as a dispersant. The weight ratio of powder, asphalt, and calcium hydroxate is 100-150:1-2:20-30:10-15. This mixture is compacted into graphite shapes without kneading or molding. The anisotropy and cracking issues are avoided due to the uniform dispersion of components in the alcohol solution. The low-temperature asphalt also reduces the graphite shrinkage during temperature changes. The resulting graphite products have improved strength and isotropy compared to conventional methods.

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Preparing high-density and high-strength carbon materials using waste carbon composite materials. The method involves mechanically shaping the waste to dissociate the interfaces between carbon fiber and pyrolytic carbon. This is followed by self-sintering and traditional sintering to densify the material. The mechanical shaping reduces porosity and refines particles to increase density. The self-sintering leverages the mesophase carbon microspheres' property to coordinate traditional sintering.

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High-density and high-strength special carbon material prepared by a cross-linking promotion process for applications like aerospace, transportation, energy and chemical industry. The carbon material is made by mixing carbon aggregate and modified asphalt binder with specific ratios. The modified asphalt has a softening point of 100-120°C and low quinoline insoluble matter content. This composition reduces volume expansion during roasting, increases density, and improves mechanical properties compared to traditional carbon materials.

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Preparing high-density, high-strength carbon materials from mesophase carbon microspheres. The method involves compressing the mesophase carbon microspheres at high pressure and temperature to densify and strengthen them. The densification process involves heating the microspheres in an inert atmosphere at temperatures above 2500°C and pressures above 20 MPa to form the high-density, high-strength carbon material. This method allows achieving carbon densities above 1.9 g/cm3 and flexural strengths above 97 MPa.

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Method for regenerating activated carbon from waste tire carbon black to improve its properties and value. The process involves treating the tire carbon black, granulating it, and then activating it again at high temperature. This removes impurities, improves adsorption capacity, and reduces carbon loss during activation compared to directly activating tire carbon black.

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Upgrading low-quality carbon fibers by pyrolyzing organic compounds like methane in their presence to improve mechanical and electrical properties. The process involves capturing some of the formed carbon particles inside a porous carbon material like carbon fiber. This reduces the porosity of the material while embedding carbon black particles. The embedded carbon black fills pores and heals defects in the original fiber, enhancing its properties. The fiber acts as a Joule heating element to drive the pyrolysis by passing electrical current through it. The carbonization process converts the fiber into a more useful product compared to the original low-quality fiber.

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Efficient modification method to optimize the structure and function of waste tire pyrolysis carbon black, enabling its recycling into high-value rubber products. The method involves selectively breaking down the surface of larger particle size carbon black to expose more active sites, while shielding the smaller particle size carbon black. This is achieved through low-temperature plasma treatment of the carbon black in nitrogen or water vapor atmospheres. The modified carbon black has improved rubber reinforcement properties compared to unmodified carbon black.

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Method to recycle and reuse pyrolysis carbon black from waste tires in tire manufacturing. The method involves treating pyrolysis carbon black with acid and grinding it before activation to restore its reinforcing properties. The acid treatment removes ash and organic molecules, and grinding reduces particle size. This improves the elongation of the regenerated carbon black compared to untreated pyrolysis carbon black. The acid treatment is followed by activation under controlled conditions to further enhance the carbon black properties. The regenerated carbon black can then be used in tire rubber instead of virgin carbon black.

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A method for granulating carbon black from waste tires that improves the quality and yield of recovered carbon black. The method involves adding a modification solution and an alkaline solution during the granulation process. The modification solution prevents agglomeration and improves conductivity of the carbon black. The alkaline solution neutralizes acidity of the binder to reduce ash content and improve carbon black quality.

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A method to prepare supercapacitors using waste tire pyrolysis carbon black as electrode material to improve specific capacitance. The method involves activating the waste tire carbon black with a combination of carbon dioxide and nitrogen at high temperatures. The CO2 promotes pore formation and expansion, while the N2 prevents excessive graphitization. This treatment increases the specific surface area and porosity of the carbon black, enhancing its performance as an electrode material in supercapacitors compared to untreated waste tire carbon black.

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High-density carbon production technology that involves heating and compressing carbon materials in an inert gas environment to create dense carbon products with improved bonding strength. The process uses carbon materials prepared by specific heating and crushing of solid pitch to produce carbon with enhanced self-sintering properties. This allows high-density carbon products to be made through heating and pressing the carbon material instead of complex multi-step processes. The inert gas protection prevents oxidation during compression. The simplified process improves efficiency, saves energy, and provides denser carbon products with better bonding compared to traditional methods.

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Process for pyrolyzing waste tires to produce fuel oil and carbon black while reducing emissions and waste. The process involves pyrolyzing tires at 350-400°C using the high-temperature flue gas from combusting the pyrolysis gas as the heat source. The pyrolysis gas is condensed to recover pyrolysis oil. A rotating rake roller crushes and agitates the tires to pyrolyze the rubber completely. A three-stage bell jar feeding mechanism isolates the tires from the pyrolysis chamber. The pyrolysis exhaust is condensed, fractionated, and used as process fluid. The carbon black is consolidated using maltodextrin solution to enhance particle strength.

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Preparing a composite material for rubber using graphene grafted onto waste tire pyrolysis carbon black. The method involves dispersing graphene oxide with a co-dispersant like sodium dodecylbenzene sulfonate, followed by chemical modification with a coupling agent like Si69, KH550, or KH570. The modified graphene is then mixed with waste tire pyrolysis carbon black to make a composite material. The graphene enhances rubber properties like strength, wear resistance, and heat generation, while the waste tire carbon black reduces ash content. The composite balances cost and performance compared to using graphene or waste tire carbon black alone.

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