Analysis of the Products and Decomposition Mechanisms of the Different Organic Impurities in Waste Glass during the Heat-Desiccation Dissociation Process

Abstract

The heat-desiccation dissociation technology is recommended to remove the organic impurity during the recovery of waste glass. Some organic impurity attaches to waste glass and the other falls off during transportation and storage. However, their differences in pollutant release during heat-desiccation dissociation have not been reported. In this study, the products and decomposition mechanisms of different organic impurities during heat-desiccation dissociation were investigated. Organic impurity attached to waste glass produced fewer pollutants, and the components of gas and residue were simpler. The main component of gas was alanine (a nontoxic substance), accounting for 40.94%. However, the main component of gas of pure organic impurity was propene (a low-toxic substance), accounting for 28.94%. Molecular dynamics showed that the decomposition degree of organic impurity attached to waste glass was low, leading to the simpler product component. The formation of NH2 • was the main reason for the generation of alanine. Thus, the organic impurity that has fallen off should be removed before the heat-desiccation dissociation process. This study provides technological guidance for the heat-desiccation dissociation technology during waste glass recovery.

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“…and adhesive impurities (label, binder, stains, etc.). Mixed impurities can be effectively separated and removed through sorting processes like high voltage electrostatic separation . Hydraulic cleaning technology is usually used to remove adhesive impurities on the waste glass surface, resulting in a large amount of high concentration organic wastewater, which limits the green recycling of waste glass .…”

“…Mixed impurities can be effectively separated and removed through sorting processes like high voltage electrostatic separation. 11 Hydraulic cleaning technology is usually used to remove adhesive impurities on the waste glass surface, resulting in a large amount of high concentration organic wastewater, which limits the green recycling of waste glass. 12 It is urgent to develop a green and efficient cleaning technology to remove adhesive impurities on the waste glass surface.…”

Control the Mechanochemical Energy of Ball Milling To Remove Surface Organic Contamination without Damaging the Integrity of the Glass

“…The hot drying process continuously introduces hot air into the reaction system to dry and dissociate the organic and inorganic impurities attached to the waste glass, so as to remove the surface contaminants from the waste glass. 12 To achieve a better pollution removal effect, the reaction system usually requires a temperature of 600 °C, resulting in a huge energy loss. The pollutants in waste glass can be removed by the disposal methods of crushing and grinding, 13 recycling value of glass is greatly reduced because it is ground into fine powder.…”

“…The hydraulic cleaning process realizes the removal of organic pollution and nonpolar pollution on glass surfaces through water pressure impact, but this process has a high energy consumption and will bring a huge amount of wastewater, leading to subsequent disposal problems. The hot drying process continuously introduces hot air into the reaction system to dry and dissociate the organic and inorganic impurities attached to the waste glass, so as to remove the surface contaminants from the waste glass . To achieve a better pollution removal effect, the reaction system usually requires a temperature of 600 °C, resulting in a huge energy loss.…”