Cryogenic comminution is the application of liquid nitrogen freezing to make waste rubber products cooled below the glass transition temperature, and then crushed with ultra-low temperature crusher of traditional Chinese medicine. Low-temperature comminution can be divided into the following two methods.
Direct freezing low temperature comminution method. The consumption process of this crushing method is to cut the bead part of the tire on the tyre dissector, at the same time divide the tread into 2-3 pieces, put them in the freezing (liquid nitrogen) installation, and then crush them with the ultra-low temperature crusher of traditional Chinese medicine, so as to get the rubber powder.
Low temperature comminution method of crushing first and then fining under freezing conditions. The consumption process of this crushing method is: cutting waste tires according to law, putting them in the freezing installation, crushing them first, freezing them again after crushing them in the ultra-low temperature crusher of hammer Chinese medicine, and then crushing them to obtain rubber powder. This method of consumption has a high cost because the demand has been frozen twice by liquid nitrogen. But when using this method to treat steel radial tire, the steel wire is easily separated from rubber, and the power consumption can be reduced correspondingly. The low-temperature grinding process has the following advantages:
(l) Suitable for crushing materials which are not easy to crush at room temperature, such as rubber, thermoplastic, etc.
(2) The internal grader can obtain the obvious particle size distribution data.
(3) Finer and more mobile rubber powder can be obtained by grinding at room temperature, and the powder after grinding has good formability.
(4) It can prevent dust explosion, odor pollution and noise.
(5) The power required for crushing is very low, which can improve the output of crusher.
(6) The crushing of thermosensitive substances will not be oxidized and transformed by heat.
(7) The difference of low temperature brittleness of various materials can be used to selectively comminute complex materials, such as tires containing rubber, metal and fibers.
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