Method for recovering and using aluminum-plastic composite film

Abstract

The invention discloses a method for recovering and using an aluminum-plastic composite film, which comprises the following steps: 1)crushing waste and old aluminum-plastic composite films, introducing in a bunker by a conveying system; 2)introducing the crushed waste and old aluminum-plastic composite films through a charging system into a reaction vessel for pyrolysis, wherein the reaction temperature is 350-500 DEG C; and 3)dedusting on oil gas and separating the oil gas, removing carbon black in the oil gas to respectively obtain heavy oil, light oil and combustible gas; cooling the crude aluminium powder in the reaction vessel through an ash-discharging system, and separating by a sorting system to obtain aluminium powder. The method is carried out under anoxic condition, aluminium foil can be recovered, plastic can be reduced to oil gas, the heat transfer effect is good, processing amount is large, no secondary pollution is generated, continuous large-scale production can be realized, and a brand new technology is created. The method has wide economic meaning and social meaning.

Description

technical field [0001] The invention relates to a method for recycling aluminum-plastic composite films, in particular to a separation and recovery method for recycling aluminum foil in waste aluminum-plastic composite films and turning plastic into oil and combustible gas. Background technique [0002] The main materials of aluminum-plastic composite packaging are low-molecular polyethylene and aluminum foil. This composite packaging material is widely used in the packaging of food, medicine, chemicals and daily necessities due to its light-blocking, constant temperature, non-toxic, safe and low-cost characteristics. . However, if a large amount of waste generated after use is not recycled, non-degradable aluminum-plastic composite packaging will be produced, which not only loses a large amount of aluminum and plastic resources, but also pollutes the environment. According to the statistics of relevant state departments, such discarded aluminum-plastic composite packaging ...

AI Technical Summary

Problems solved by technology

Although the separation efficiency has been improved, due to the single type of solvent selected, there are problems of compatibility with water and organic acids and problems of effective penetration.

In addition, because the solvent used is toxic and volatile, it pollutes the environment

[0005] The Chinese patent publication number is that the technical scheme recorded in the patent literature of CN101165084A, CN1559704A and CN1693344A is then utilizes surfactant to improve the compatibility of system on this basis, adopts metal salt to reduce the loss of metal aluminum, but above all The methods used all have defects of varying degrees, such as polluting the environment, large loss of solution volatilization, high recovery cost, high degree of oxidation of metal aluminum, etc.

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