Improving Quality of Reclaimed Carbon from Tires

A method to produce white carbon black from waste tires for use in tires and other rubber products. The method involves extracting silica from tire rubber using an alkaline solution, followed by carbonization to convert the extracted silica into white carbon black. The extracted silica is obtained by treating shredded tire rubber with a high-temperature alkaline solution. The carbonization step involves heating the extracted silica to form white carbon black. This allows recycling and reusing silica from waste tires instead of mining virgin silica.

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Deep processing technique to improve the quality of waste tire pyrolysis carbon black. The technique involves steps like sieving, grinding, magnetic separation, and air classification to remove impurities and agglomerates from the pyrolyzed carbon black. This results in carbon black with higher surface area, oil absorption, and reinforcing properties compared to untreated pyrolyzed carbon black. The technique involves sieving to remove large pieces, grinding to crush, magnetic separation to remove ferromagnetic impurities, and air classification to further separate and refine the carbon black particles.

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An environmentally friendly process to produce high-quality recycled carbon black from waste tires. The process involves impurity removal, drying, activation, and granulation steps. The impurity removal involves screening out large stones and deironing. The drying reduces moisture content. The activation involves heating in an oxygen-deficient atmosphere to crack the carbon structure and release volatile products. The granulation converts the activated carbon into a powder. This process improves the quality of recycled carbon black from waste tires, reducing oil absorption, iodine absorption, and specific surface area compared to conventional methods.

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Processing and using recycled carbon from tire pyrolysis to improve the performance of rubber compounds. The recycled carbon is milled to a specific particle size distribution with a target D50 below 2.7 microns and maximum 15% over 5 microns. This milled slurry is mixed with elastomer and other fillers to form rubber composites. The milling step reduces agglomerates and improves dispersion compared to unprocessed pyrolysis carbon. The milled recycled carbon has better rubber compound properties like reduced macro dispersion compared to unprocessed pyrolysis carbon.

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Ecological process for purifying and reactivating carbon black from tire pyrolysis that reduces environmental impact compared to traditional methods. The process involves solvent extraction or heat treatment to remove impurities like bitumen and zinc from the carbon black. The solvent extraction uses medium polarity solvents with low toxicity and environmental impact. The heat treatment is done in an inert atmosphere. After purification, selective extraction of zinc using natural carboxylic acids like citric acid further improves the carbon black quality. This purification process enhances the carbon black's reinforcing properties by removing impurities and restoring the surface area.

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A process for converting used tires into carbon black by thermal decomposition that avoids the formation of coke and produces a cleaner liquid fraction. The process involves dissolving the tire filler in a solvent at low temperature, then raising the temperature to crack the polymer bonds. This allows selective extraction of the rubber components without extensive coke formation. The resulting carbon black is filtered and washed. The liquid fraction contains aromatic hydrocarbons suitable for solvent or fuel applications.

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A method to prepare regenerated carbon black from pyrolyzed tire rubber for reuse in tire manufacturing. The method involves treating the pyrolyzed carbon black with acid followed by grinding before activation. This removes ash and restores activity by cleaning organic molecules from the surface. The acid treatment before activation ensures uniformity and purity of the regenerated carbon black. The acid-treated, ground pyrolyzed carbon black is then activated in oxygen, carbon dioxide, water vapor, and nitrogen to restore its reinforcement performance.

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Recycling/upcycling of mixed rubber waste streams from tyre manufacturers. The recycling includes pyrolyzing mixed rubber waste streams to obtain a char material; further processing the char material obtained in step i) to obtain a carbon black powder; wherein the pyrolysis in step i) comprises at least a two-stage pyrolysis process, wherein the two-stage pyrolysis process comprises a first pyrolysis stage to obtain an intermediate char material, a second pyrolysis stage to obtain a char material, and a third pyrolysis stage to obtain a char material.

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Recovering carbon black from waste tires and processing it into a form that can be more easily used in rubber and plastic applications. The process involves pyrolyzing tire rubber to extract carbon black, grinding the pyrolyzed rubber to reduce particle size, drying the ground material to remove moisture, and granulating the dried material into a uniform size. This reduces agglomerate size, improves dispersibility, and reduces contaminants compared to directly pyrolyzing whole tires. The granulated carbon black can have better properties when added to rubber compounds.

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Method to activate waste tire pyrolysis carbon black by micro-oxidation to improve its properties for rubber compounding. The method involves granulating the pyrolysis carbon black instead of directly grinding it, which reduces dust generation. The carbon black is first crushed to remove steel wires from the tires. The tire pieces are then pyrolyzed at temperatures around 400-700°C to obtain different carbon blacks. The pyrolysis gas and oil are condensed and returned as fuel. The carbon black is ground, mixed with granulation solution, granulated, and dried. Additives like carbon black dispersant and silane coupling agent are used in the granulation step to improve the carbon black's lipophilicity and compatibility with other rubber components.

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A method to prepare carbon black for tires using carbon waste instead of traditional fossil fuel sources. The process involves breaking down the carbon waste particle size, treating it with acids and peroxides, pyrolyzing it at high temperatures, and then expanding and activating the resulting carbon black particles. This allows utilizing industrial waste like aluminum electrolysis cathodes and batteries to produce carbon black for tires at lower cost while reducing waste.

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Reducing ash content of pyrolysis carbon black from waste tires while recovering beneficial components like zinc sulfide (ZnS). The process involves selectively removing ash and ZnS from the carbon black through chemical treatments. The carbon black is mixed with water, copper sulfate, and sodium sulfite to dissolve ZnS. Zinc sulfate is then precipitated by adding butyl xanthate. This enriches the ZnS while separating it from the carbon black. The carbon black is then dried to remove the water. This reduces the ash content and recovers the ZnS for reuse.

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Thermal treatment of used tires to convert them into recovered carbon black and fuel. The process involves thermolysis of the tires to decompose the rubber and fibers into the products. The recovered carbon black has a surface chemistry and behavior similar to semireinforcing smoke blacks used in rubber. The fuel has a lower content of carbonaceous material compared to conventional pyrolysis oils. The lower carbon content in the fuel is achieved without post-processing steps like distillation or catalysis. This reduces investment, waste generation, and operating costs compared to conventional methods.

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System and method for refining waste tire pyrolysis char to produce high-quality carbon black. The system involves sequential steps like sorting, pyrolysis, pulverization, molding, drying, screening, and packaging to improve char purity and make spherical carbon black. The pyrolysis furnace removes volatiles from the char before pulverization. This reduces impurities compared to batch pyrolysis. The method also periodically cleans the pyrolysis gas release pipe to prevent buildup.

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Activating waste tire pyrolysis carbon black to improve its properties for commercial applications. The activation involves micro-oxidation treatment in a separate furnace to open up blocked pores and enhance surface activity. This addresses issues with pyrolysis carbon black from waste tires having blocked pores due to ash and coke accumulation, which reduces surface activity and hinders further processing. The activation improves the carbon black's characteristics for subsequent finishing steps and expands its commercial applications.

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Method and equipment to upgrade low-value pyrolysis carbon from waste tire cracking to high-quality pyrolysis carbon black for rubber. The method involves deep processing steps like magnetic separation, grinding, granulation, sieving, and drying to meet rubber standards for tires and belts. The equipment includes a raw material warehouse, magnetic separator, modified silo, grinder, granulator, and radial cylinder dryer. This allows converting pyrolysis carbon from waste tires into usable rubber-grade carbon black.

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Recycling tires and rubber products to obtain carbon-containing material with improved properties for use in new tires. The recycling process involves mechanically shredding the tires, removing metal bead rings, and treating the shredded rubber with inhibitors to reduce impurities. The treated rubber is then pyrolyzed to produce carbon-containing material. The pyrolysis residue is separated into solid carbon and liquid condensate. The solid carbon is further processed to remove metal contaminants using magnetic separation. The resulting cleaned carbon powder has improved surface area and impurity levels compared to pyrolysis-only recycling, making it suitable for use as a tire filler.

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Upgrading carbon black recovered from waste tires by eliminating residual volatile substances and inorganic additives through processing of carbon black produced by performing a pyrolysis on waste tires. The upgrading involves steps like magnetic separation to remove iron wires and fibers, micronization, heating to eliminate volatile substances, acid treatment to convert inorganic substances to salts, filtering, washing, coagulation, and drying. This enables recycling and reuse of the carbon black from waste tires with improved quality and purity.

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A process to efficiently convert waste tires into carbon black using a modified combustion method. The process involves pyrolyzing tires in a reducing gas atmosphere obtained by combusting tire vapors. This produces carbon black and gases. The gases are condensed and the condensate mixed with ground tire carbon. This mixture is combusted with excess air to further carbonize the tire fragments. The excess air prevents full combustion and creates a better quality carbon black. The process reduces ash and toxic impurities compared to direct tire combustion. It also avoids complex waste introduction.

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A method and device for treating waste tires that involves crushing the tires, thermal cracking the rubber particles to extract useful materials like carbon black, and then separating and processing the carbon black. The key features include optimized temperature and pressure conditions for cracking the rubber, vacuum pumping to prevent air leakage, and controlled cooling and screening to separate carbon black from steel. This allows efficient extraction of valuable materials from waste tires.

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