Cryogenic Grinding Techniques for Recycling Tires

A pollution-free method for recycling tires that involves cryogenic freezing, crushing, and sieving instead of shredding and high-temperature treatment. The method involves shredding tires, spraying them with water, filtering, drying, freezing, crushing, separating metal fibers, crushing again, sieving, and screening to produce clean tire particles. The cryogenic freezing step reduces odor, dust, and pollution compared to high-temperature processing.

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A waste tire recycling system that pulverizes tires into rubber powder without pollution. The system involves a series of crushing, washing, freezing, and grinding steps. The tire is first crushed into fragments. The fragments are washed and then crushed again to make smaller fragments. These fragments are then frozen and ground into primary powder. The primary powder is split and further frozen and ground into secondary powder. This multi-stage freezing and grinding process allows efficient pulverization of tires into rubber powder without generating pollutants like dioxins.

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A cold energy recovery system for recycling waste tires and plastics into powder using liquid nitrogen. The system has a material tank with chambers, a feeding pipe, a liquid nitrogen chamber, a powder tank, and pipes connecting them. Nitrogen from the liquid nitrogen chamber is pumped into the feeding pipe to cool the material. The cooled material goes to the liquid nitrogen chamber for further cooling. Nitrogen from there is pumped into the feeding pipe to cool more material. The powder produced in the liquid nitrogen chamber is pumped to the powder tank. This recycles and reuses the nitrogen's cold energy to reduce waste. The chambers, pipes, and tanks are insulated to further minimize cold energy loss.

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Crushing and screening device for waste tires that improves crushing efficiency by using multi-stage processing with microwave treatment, magnetic separation, and controlled freezing. The device consists of a microwave processor, magnetic separator, and multi-stage crusher. The microwave treatment softens the tires for easier cutting. The magnetic separator removes steel. The freezing chamber embrittles the rubber for better crushing. This sequence of steps enhances efficiency compared to direct cutting.

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A device for crushing old tires using refrigerated airflow that freezes and crushes tires in a uniform and efficient manner. The device has a crushing chamber, pre-cooling chamber, and heat exchange chamber. The crushing chamber has a rotating shaft with connecting rods and a top plate for tire crushing. The pre-cooling chamber has a refrigerator and the heat exchange chamber has an exhaust pipe. Air compressor cools and pressurizes air, which is sprayed downward by the first branch pipe and upward by the second branch pipe to freeze the tires. The reversing airflow and high pressure crush the frozen tires. The uniform freezing prevents uneven crushing. The heat exchange recovers refrigerant energy.

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A method to produce high-quality rubber powder from waste tires for use in tire treads. The method involves cryogenic grinding of the tire rubber at sub-glass transition temperatures to achieve small particle sizes. It uses a two-stage nitrogen cooling process with normal and low temperatures. This produces a high proportion of fine rubber powder with improved properties for tire treads compared to conventional grinding. The cryogenic grinding prevents heat buildup and stickiness, allowing finer sizes. The resulting powder can be used in tire treads for better performance and sustainability.

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Device to prepare fine rubber particles from waste tires that avoids the limitations of existing methods. The device uses a vibratory feeder to drop the crushed tire blocks into a pre-cooling chamber where they jump and tumble. This motion further breaks the rubber as it rolls down and exits through a chute. The chamber is cooled by a freezer to solidify the rubber. The freezing chamber has an air inlet and outlet to circulate cold air. The vibratory feeder and tumbling motion in the pre-cooling chamber improve particle size reduction compared to just freezing the rubber.

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Low-temperature grinding equipment for recycling waste tires into fine rubber particles. The equipment uses a closed-loop cooling system with liquid nitrogen to precool and then cool the tire rubber before grinding. A low-temperature crushing device with adjustable pressure applies force between grinding discs at low temperatures to prevent carbonization and oxidation. The equipment has a feeder, cooling boxes, and a controller to optimize grinding parameters for customized particle size.

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Producing micronized powders like rubber powder from heterogeneous materials like used tires in a predictable particle size range and concentration that allows incorporation into other applications regardless of the infeed material. The method involves cryogenic grinding, screening, warming, fiber and metal removal, and accumulation steps. Warming the particles using a PID loop with recirculation to improve efficiency. A vibrating screener removes fibers while letting the micronized powder pass. Accumulation decouples grinding and screening rates.

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Cryogenic processing of rubber waste to produce high-quality devulcanized rubber powder that can replace fresh rubber in manufacturing. The method involves cooling the rubber waste to very low temperatures using liquid nitrogen or cold air. This makes the rubber brittle and enables it to be cryogenically milled into small, irregularly shaped particles with active surfaces. This devulcanized cryogenic rubber powder has properties similar to fresh rubber and can replace it in production at a much higher rate, improving quality compared to smooth-surfaced cryogenic rubber powder made by grinding.

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High-efficiency low-temperature grinding method for preparing micro powder rubber from waste tires. The method uses a low-temperature crushing system with liquid nitrogen refrigeration. This allows direct solidification and grinding of the rubber at very low temperatures to achieve fine particle sizes. The low temperature prevents material melting and sticking in the grinding equipment. The liquid nitrogen also helps with material flow and reduces energy consumption compared to traditional grinding methods. The low-temperature grinding system has a hopper for solidified rubber feeding, a crushing chamber cooled by liquid nitrogen, and a collection vessel for the micro powder.

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A process to comminute used rubber tire particles into a fine powder that can be used in the manufacture of new tires without needing functionalization or surface activation treatments. The process involves grinding the tire particles in a cryogenic mill at low temperatures to create free radicals that vulcanize rapidly when mixed with fresh rubber. The cryogenic grinding also reduces particle size and controls distribution. This results in a powder rubber with improved properties and compatibility compared to unprocessed tire crumb.

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A method for recycling waste rubber from tire manufacturing into new tire raw material using nitrogen gas. The waste rubber is crushed at low temperature using liquefied nitrogen. The crushed rubber is then used as a recycled raw material for tire production. The vaporized nitrogen gas generated during crushing is captured and supplied to the tire vulcanization process as a pressure medium. This allows recycling the waste rubber without energy-intensive reprocessing and reduces carbon emissions compared to thermal reprocessing.

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A process for recycling tires that involves washing the rims, cutting them into pieces, cryogenically freezing the pieces, grinding them, separating the nylon and polyester fibers, screening the rubber for size, compressing the steel, packing the nylon/polyester, and packing the rubber. This allows high recovery of usable materials from tires compared to traditional abrasive grinding. The cryogenic freezing step enables efficient separation of rubber from steel and fibers without clogging issues.

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A method and apparatus for producing crushed and powder rubber from used tires and other rubber products with a predetermined particle size range. The process involves cooling the rubber particles with a cryogenic fluid like liquid nitrogen to a specific temperature, then grinding them to the desired size. The cooling step reduces particle bonding and enables efficient grinding into consistent sizes. This allows producing rubber powder and crumb with targeted particle sizes suitable for tire and other rubber product manufacturing.

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Efficiently producing powder rubber from recycled tires and other used rubber sources in a way that enables cost-effective, large-scale production of powder rubber with consistent particle size ranges for use in new rubber products. The process involves preprocessing the rubber particles to specific size ranges, drying them, precooling them to -0°F, freezing them below their glass transition temperature with cryogenic liquid, and then controlled comminution that varies based on the original particle size. This allows consistent, predictable powder rubber with targeted particle sizes for incorporation into new rubber products.

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A method and equipment for recycling discarded rubber products like tires to extract and reuse the components like steel, textile, and rubber without degradation. The method involves separating the tires into beads, sidewalls, and treads using water jets. The sidewalls and treads are then cut into uniform pieces. The cut pieces are frozen and crushed to separate into rubber granulate, metal, and textile. The mixture settles and is sorted into fractions. This allows complete separation and recovery of the individual components without degradation. The freezing chamber has a controlled liquid nitrogen level using sensors in an interconnected chamber to maintain proper freezing conditions. The crushing knives have shaped edges like spirals or circles.

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A waste rubber recycling system for converting used rubber products into reusable fine rubber powder. The system uses a specialized breaking machine with parallel drums and an adhesive lining to crush and grind the waste rubber into smaller particles. The process involves pre-smashing the rubber in the breaker, removing impurities like fibers and steel, then grinding it to the desired particle size. This allows separation and recycling of the waste rubber instead of landfilling.

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A process to convert old tires into powdered rubber that can be used in various applications. The process involves chopping the tires into pieces, then cooling them at low temperatures to make the rubber brittle. This allows further grinding into powder. By cooling the chopped pieces before further processing, it prevents melting and enables smaller granule sizes. The cooling step enables converting tires into powder, which cannot be achieved by just chopping.

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A process for cryogenically grinding scrap rubber into powder suitable for recycling applications. The process involves cooling scrap rubber chips to temperatures around -90 to -110°C using a nitrogen-filled cryogenic cooling tank. The cooled rubber is then comminuted into powder smaller than 10 mesh size using mechanical grinding equipment. Cryogenic grinding allows the rubber to be easily pulverized into a finer particle size compared to room temperature grinding. The low temperature brittleness of the rubber makes it easier to grind into powder.

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