"Fine lignin powder is explosive, has poor flow characteristics and a low bulk density. For this reason, product handling is complex, occupational health and safety is cost-intensive and large warehousing areas are required," says Sonja Seiler, pointing out the challenges. The solution to these challenges is granulating or briquetting lignin powder. In the process, the raw material is pressed, dust and webs are sieved out, and then fed back into the process. A roller press enables the production of dust-free lignin granules or briquettes with a high product quality, increased bulk density and good flowability. "This not only enables better further processing, safe storage and efficient transport, but also reduces the risk of dust explosions and contamination," Sonja Seiler sums up.
The granulation process consists of evenly dosing the material into the compactor, where it is compressed into a flake by two counter-rotating rollers. Subsequently, the flake is broken down to the desired particle size by pre-crusher and roller crusher.