Polyethylene (PE) waste material-based carbon-fixed aggregate with wire mesh shell, and preparation method of PE waste material-based carbon-fixed aggregate

A preparation method of a polyethylene (PE) waste material-based carbon-fixed aggregate with a wire mesh shell, comprising the following steps:

• S1, pretreatment of a PE material collected:
• S101, rinsing the PE material with water and cleaning with a detergent, and drying a cleaned PE material to produce a dried PE material, wherein the PE material comprises a waste mulch film and a drip irrigation belt, and a mass ratio of the waste mulch film to the drip irrigation belt is 1.3:1;
• S102, shredding the dried PE material to produce a shredded PE material with a side length and a diameter of less than 2 mm;
• S103, mixing the shredded PE material with a 1.2 mol/L dibutyl sebacate solution and a 0.8 mol/L epoxidized polyether solution, and feeding into a hot-melt extrusion granulator for granulation to produce spherical-like PE waste particles, wherein a mass of the dibutyl sebacate solution is 1.1% to 1.2% of a mass of the shredded PE material, and a mass of the epoxidized polyether solution is 0.8% to 1% of the mass of the shredded PE material;
• S104, crushing the spherical-like PE waste particles into a PE waste powder with a particle size of 0.02 mm to 0.03 mm;
• S2, carbon fixation for a pumice to produce a carbon-fixed pumice:
• placing the pumice in a carbon fixation machine, controlling the carbon fixation machine at a carbon dioxide concentration of 15%, a carbon fixation pressure of 1.01 KPa, and a rotational speed of 120 r/min, and conducting the carbon fixation for 3 h to produce the carbon-fixed pumice;
• S3, preparation of a powder-adsorbed pumice:
• spraying 0.7 parts to 0.9 parts by weight of a sodium silicate solution with a concentration of 1% wt on a surface of 97 parts to 114 parts by weight of the carbon-fixed pumice to produce a pretreated pumice;
• and
• mixing 6.5 to 7.5 parts by weight of the PE waste powder with 8.9 to 10.5 parts by weight of a dispersant powder, and then mixing with 97.7 to 114.9 parts by weight of the pretreated pumice, and treating in a gravity stirrer at a rotational speed of 120 r/min for 3 min to produce the powder-adsorbed pumice;
• S4, high-temperature calcination to form a wire mesh shell skeleton:
• S401, preheating:
• preheating the powder-adsorbed pumice at 120° C. to 130° C. for 3 min to 4 min;
• S402, melting:
• 2 min later, continuously heating a preheated pumice produced in the S401 at 150° C. to 170° C. for 4 min to 5 min to make a powder on a surface of the preheated pumice melted;
• S403, formation of the wire mesh shell skeleton:
• 2 min later, continuously heating a heated pumice produced in the S402 at 190° C. to 220° C. for 7 min to 9 min to form the wire mesh shell skeleton on a surface of the heated pumice;
• and
• S404, cooling:
• air-cooling a pumice with the wire mesh shell skeleton obtained in the S403 in an anaerobic environment for 20 min to produce the PE waste material-based carbon-fixed aggregate with the wire mesh shell;
• and
• S5, post-treatment:
• curing the PE waste material-based carbon-fixed aggregate with the wire mesh shell obtained in the S404 for 28 d under standard conditions, wherein the standard conditions are as follows:
• a temperature:
• 20±2° C., and a humidity:
• 95% or more.