Abstract
Abstract Froth flotation is the most common process in mineral processing. For the separation of plastic mixtures by flotation, the use of appropriate wetting agents is mandatory. The floatability of six post-consumer plastics was studied at different concentrations of the wetting agents, saponin and sodium lignosulfonate. Also, the influence of size and shape of the particles were analyzed. Contact angle and floatability of the six plastics decreased with increasing wetting agents concentration. The order of floatability is similar to the order of the contact angles values. However, the influence of the wetting agents in the plastics floatability is more pronounced than in the contact angle. Floatability decreased with the increase of particle density, particle size and spherical shape. For fine particles floatability is fundamentally conditioned by the contact angle, while for coarse particles floatability is fundamentally conditioned by the particles weight.
Highlights
Plastics have become widely used materials because of Flotation is the most common concentration process used by their advantages, such as cheapness, durability, lightness, and the mineral industry, allowing the separation of hydrophobic hygiene
In a mixture of hydrophobic rising, gradually replacing materials like glass and metal. and hydrophilic particles suspended in water, with air bubbled In the last decade, the world production of plastics has been through the suspension, the hydrophobic particles attach growing around 3.5% per year, increasing from 230 million tonnes in 2005 to 348 million tonnes in 2017, with an European production of 64.4 million tonnes (18.5% of the world plastic production)[1]
The six plastics are naturally floatable in the absence of a wetting agent
Summary
Plastics have become widely used materials because of Flotation is the most common concentration process used by their advantages, such as cheapness, durability, lightness, and the mineral industry, allowing the separation of hydrophobic hygiene. Hydrophilic particles suspended in water, with air bubbled In the last decade, the world production of plastics has been through the suspension, the hydrophobic particles attach growing around 3.5% per year, increasing from 230 million tonnes in 2005 to 348 million tonnes in 2017, with an European production of 64.4 million tonnes (18.5% of the world plastic production)[1]. In order to separate plastic mixtures by froth flotation, one or more plastic type must become hydrophilic by the addition of selective wetting agents, while the others are maintained hydrophobic[2,3,4,5]. Several wetting agents of plastics have been tested for the selective flotation of plastic mixtures. Plastic flotation is controlled by the hydrophobicity, and by the shape and size of the plastic particles[18,19,20,21,22]
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