ALmix Duo Drum Max | Overview

The team at ALmix has been building and perfecting Duo Drum technology since 1990, so you can be assured that our solutions are rooted in proven technology and time-tested engineering principles.

Simplicity is the word for the Duo Drum Max ‘CF’ counter flow asphalt plant. The Duo Drum utilizes a counterflow dryer with a mixing drum. Each is a separate unit. The mixing time is never too short and valuable liquids and additives are never exposed to extreme temperatures. Not only does this mean you get maximum heat transfer efficiency and a correspondingly low stack temperature, but you also get the ability to run higher percentages of RAP in your mixes. The Duo Drum ‘CF’ plant can be portable or relocatable and is offered in production ranges from 120 TPH to 600 TPH.

ALmix Duo Drum CF | Process

Counterflow Dryer: The Duo Drum system begins with a counterflow dryer allowing for maximum heat transfer efficiency, low stack temperatures and the ability to use a higher percentage of RAP. As the superheated virgin material travels towards the burner end, it is blended with recycle material as it passes under the burner flame. This process allows for a positive charging of the mixing drum through the high lift side discharge.

Rotary Mixer: The first section of the rotary mixer is used to allow the superheated virgin material and the RAP material to continue to blend and seek a uniform temperature. Next, the return dust from the baghouse and mineral fillers are added through the same discharge chute as the superheated materials as they pass into the rotary mixer. Finally, the liquid asphalt and any liquid additives are added without being subjected to temperature extremes.

Hydrocarbon Control: A small fan is supplied to pull of any hydrocarbons that have been stripped from the liquid AC or the AC present in the RAP content in your mix. The fan captures these hydrocarbons and delivers them to a manifold encircling the burner where they are consumed by the intense burner flame.