Recovering valuable metals from highly viscous residual waste

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Last modified: 8 May 2023

Thick, highly viscous residual waste flows from the petrochemical industry that may also be contaminated with hard objects are very difficult to process. Because this residual waste often contains valuable pure metals, Dinnissen has developed a new purpose-built recovery system. The system covers the complete process from emptying the drums, containers or big bags right up to final packing of the purified metals.

Special grinding unit processes residual waste into a homogenous material
Certified waste flows from the petrochemical industry which are both highly viscous and contaminated with wood, stone and iron particles were almost impossible to process until recently. However, Dinnissen has now developed a new technology in order to recover precious metals such as chrome and molybdenum from this material. The thick, viscous tar mass (from drums, containers and big bags) is placed in special tipper units. The tipper units are vibrated and shaken vigorously in order to empty the mass into a special grinding unit, which is equipped with robust scrapers and breakers. The grinding unit processes the waste flow including hard contaminants into a homogenous material that is transported into an incinerator via a worm wheel conveyor that acts as a metering unit. The temperature in the incinerator is set to the ideal value for recovering the desired metal. While all the waste products are burnt completely during this incineration process, the valuable pure metals remain behind. The metals are allowed to cool in a special silo before being packed in big bags as a pure raw material.

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Dinnissen Process Technology

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