Novel Recycling to Transform Automotive Waste Glass and Plastics into SiC-Bearing Resource by Silica Reduction

Abstract

A significant amount of end-of-life plastics and glass are currently landfilled, incinerated, or just illegally dumped even though conventional plastic and glass recycling practices are well established. This paper describes a novel approach to synthesize silicon carbide (SiC)-bearing product by utilizing waste automotive glass and plastic. The reduction of silica in glass by blend of graphite and plastic (Bakelite) to produce SiC was established experimentally under inert condition at a temperature 1,550°C. The results from X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy EDS confirm the formation of SiC, and the reaction kinetics and the mechanism of reduction were investigated by means of infrared gas analyzer. Rate constant, k = 12.8 9 10 -4 s -1 , for the initial stage was measured for overall silica reduction, and the mechanism was established to be predominantly controlled by chemical reactions. This process innovation has two significant advantages: it is a major step toward transforming nonmetallic automotive waste into valuable resources like SiC-containing refractory materials, and it reduces the industry's reliance on conventional raw materials including quartz and coke which are typically used as silicon and carbon bearing resources.

Waste thermosetting polymer and ceramic as reinforcement in thermoplastic matrix for sustainability: Thermomechanical investigations

“…These results are in line with the observations made by other investigators. 29,[31][32][33] The reason for composition/proportion F: 90% ABS-10% B-0% Al 2 O 3 -0% SiC is but obvious because absence of ceramics in the composite matrix is supposed to improve tensile properties. The highest temperature condition 230 C with lowest 30 r min À1 and 5 kg feeding load is also but obvious settings as these settings will result into better flowability of composite material resulting into more uniform dispersion which has been observed in photomicrographs (Figure 4).…”

Reaction Mechanism of Ferrosilicon Synthesis Using Waste Plastic as a Reductant

“…15) Graphite pellet did not show any trace of CH 4 gas, whereas Bakelite showed small amount of CH 4 due to degradation of Bakelite and a major portion of CH 4 gas helped reduction reactions (reaction (4)). 14,19) Figure 4 compares the total amount of oxygen removal with time temperature of 1 623 K, 1 723 K and 1 823 K (1 350°C, 1 450°C, 1 550°C) due to the reactions occurring within the graphite and Bakelite bearing pellet. Total cumulative oxygen was measured from the ppm values of CO and CO 2 evolved during the reduction reactions by graphite and Bakelite.…”

“…14) Bakelite transformation as reductants for ferrosilicon alloy synthesis is also reported. 15) In this paper, a fundamental comparative study on reaction kinetics and mechanism of ferrosilicon alloy synthesis, using reagent grade material, graphite and waste plastic, Bakelite as reducing agent within 1 623 K to 1 823 K (1 350°C to 1 550°C) is reported.…”

Characteristics of waste automotive glasses as silica resource in ferrosilicon synthesis

“…Construction materials from waste glasses (Calmon et al, 2014;Demir, 2009;Ling et al, 2012;Maeda et al, 2011) and utilization of waste optical fibre consisting of silica glass with plastic coating to produce silicon were also reported (Ogura et al, 2004). Recently, we reported formation of SiC and ferrosilicon from waste glass and plastic (Farzana et al, 2014a;Farzana and Sahajwalla, 2015).…”