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Glass extraction hits 95% purity

Tomra Sorting Recycling has introduced Autosort Color, a unit that works in combination with Autosort Laser to separate glass from municipal solid waste (MSW).

Autosort Color achieves purity rates of greater than 95% at high throughput rates, even when input materials are wet, dusty or dirty.

The unit enables sorting operations to extract this glass from the MSW stream for resale. It also reduces the risk of disruption, downtime and repair costs arising from damage to components when glass ends up in sorting machines that are not intended for glass.

The first step in the process of removing glass from MSW is pre-treatment. After infeed material passes through a bag opener, conventionally the fine fraction is screened out. This fraction is then split into three categories by a double-deck vibrating screen.

In the second step, the middle fractions, which contain the highest glass content, are subjected to density separation. In the third and final step of the process, the Autosort Color unit classifies the glass fractions with a high-performance camera and separates any remaining impurities from the higher quality glass.

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