Glass Micro Balls Based on Glass Domestic Waste for Road Construction

The glass micro balls based on glass domestic waste for road construction were obtained. Glass micro balls will reduce the contamination of road marking and increase its light-reflective ability at night. Colorless and colored container glass, as well as lead crystal, was chosen as the starting material for producing glass micro balls. An electric arc plasmotron UPU-8M was used to produce glass micro balls. Pre-crushed fractionated glass together with plasma-forming gas – argon was fed to the powder feeder and from the feeder to the plasma burner. Under the influence of high plasma temperatures, about 9000-12000K, the particles were melted, followed by cooling in the outgoing flow of plasma-forming gases. Due to high-temperature plasma exposure, partial evaporation of alkaline oxides and lead oxide occurred. Glass micro balls were enriched with the oxides of silicon, aluminum and calcium. This helped to increase the acid and alkali resistance of glass micro balls. The micro hardness, density, and refractive index of glass micro balls were studied. It is shown that glass micro balls have an ideal spherical shape and are x-ray amorphous. Glass micro balls are recommended for use in road construction as a reflective element of road marking.

Block Foam Glass with Plasma Protective and Decorative Coatings

An innovative energy-saving technology for producing block foam glass with a protective decorative coating has been developed, including the preliminary application of an intermediate heat resistant coating followed by the application of the main coating and the plasma jet melting. The optimal composition of the intermediate heat resistant coating, its preparation technology and laying on the front surface of the foam glass block are determined. It is shown that the main factor shaping the quality of the foam glass insulating block with a protective decorative coating is the speed of the plasma burner movement with a plasma jet on the front surface of the foam block glass with a preliminary applied two-layer heat resistant protective decorative coating. The formation regularity of the front layer texture of a protective and decorative coating on the plasma jet speed to the enclosing foam glass block has been established. It is shown that at the optimum plasma processing speed of 10 mm/s, a continuous, high-quality protective and decorative coating is formed. The features of the phase composition and microstructure of a multilayer heat resistant protective decorative coating are investigated. It is established that the surface layer is represented by an amorphous vitreous phase.

Development of a Plasma-Dump Combustor for VOC Destruction

Volatile organic compounds (VOCs) are gases with low calorific values produced from the painting or drying process whose stable combustion cannot be ensured by direct combustion. In this study, a novel plasma-dump combustor was proposed to remove the VOCs. The combustor is combined the concept of a plasma burner, a dump combustor and a 3D matrix burner. Therefore, it can achieve high destruction with low input energy and stable flame at low temperature.The toluene was used as a representative VOC. The toluene reduction characteristic was examined according to the total gas feed, toluene concentration, dump injector position, and 3D matrix heat accumulator. The toluene decomposition efficiency was 99.5%, and the energy efficiency was 447.2 g/kWh was at the optimum operating conditions.