Hot Recycling Plant

Understanding today's pressing environmental issues and rapidly increasing pollution problem, as a member of the world population, LINNHOFF is committed to protect and conserve our last natural resources. We strive to balance between development and environmental protection by being innovative in the design of our system.

With good experiences gained from Germany, we learned that a total system must be able to combine Pollutants Reduction, Energy Conservation, Temperature Control and material treatment; ultimately achieving the highest level of waste recycling but not compromising the mix quality.


1. Pollutants Reduction

Proper control of the temperature and recirculation of hot air minimizes the production of harmful fumes from the heating of asphalt.

The majority of the harmful substances recirculated are being expended at the hot air generator's flame zone, thus giving us a cleaner exhaust. Asphalt fumes not circulated are being captured by fines injected at the Fumes Arrester before going into the baghouse.

2. Temperature Control

Full automatic control by the computer on the air flow through the control of the dampers and the temperature monitoring by the thermometer at various positions, bringing the RAP to the ideal temperature at reduced oxidation for the mixing with the virgin material.

3. Energy Conservation

The burner uses high pressure to atomize the fuel out of the nozzle. All the air required for the combustion is supplied by an incorporated radial/axial flow fan coupled with a regulator plate regulating the fuel feed valve to ensure exact air - oil proportioning, thus ensuring fully combusted flame to be developed in the burner head. Minimized fuel wastage gives the owner a significant saving over one-year operation.

The flame entering the hot air generator is further mixed with the returned air to give the air a final temperature of approximately 600°C for optimum heat transfer to the RAP. The special construction of the system ensures the optimum temperature of 140-150°C for the RAP before discharging into a buffer silo. By this method of recirculating the hot air, approximately 25% of energy is saved.

4. Material Treatment

In the treatment of RAP, it is always important to prevent excessive fines or asphalt dust being produced for following reasons:

  • the heated asphalt dust will be choked up the pollution control system by sticking onto the filter socks
  • the plant circulation system and drum may be progressively coated with the asphalt thus requires constant cleaning
  • possible change in the properties of the RAP, e.g. oxidation and burning due to increased surface area where too much hot air is in contact with the asphalt

LINNHOFF is able to offer the MILL CRUSHER as a total solution which is proven for more than ten years in Germany.

Main Components:

Control System

Clear flow charts and logical arrangements of function keys and control monitor guarantee ease of operation and perfect handling of all automatic control system.

Plant operator can simultaneously control various functions, thus reducing the number of people required to run the complete plant.

With the high speed computer controlling the plant in the background, essential communication with the operator is done through a mimic diagram displayed on a touch - screen monitor. The system is highly user friendly with control command to the computer being input via the computer screen by the touch of a finger.



Philconstruct, 6 - 9 January 2018, Manila, Philippines
BuildExpo Africa, 22 - 24 November 2017, Kigali, Rwanda
IQM Conex, 31 October - 1 November 2017, Putrajaya, Malaysia
EthioCon, 20 - 24 September 2017, Addis Ababa, Ethiopia
Construction Indonesia, 13 - 16 September 2017, Jakarta, Indonesia
Intermat Asean, 8 - 10 June 2017, Bangkok, Thailand
Cambodia Construction Summit & Expo 2016, 1 – 3 December 2016, Phnom Penh, Cambodia
Bauma China, 22 – 25 November 2016, Shanghai, China
Philconstruct, 10 – 13 November 2016, Manila, Philippines
Big 5 Konstruksi Indonesia, 9 – 11 November 2016, Jakarta, Indonesia
IQM Conex, 25 – 26 October 2016, Putrajaya, Malaysia
Roads & Rail Infrastructure Summit 2016, 27 – 28 September 2016, Dar es Salaam, Tanzania
Ethio-Con, 21 – 25 September 2016, Addis Ababa, Ethiopia
West Africa Building & Construction, 22 – 24 June 2016, Accra, Ghana
BuildExpo Africa, 4 – 6 June 2016, Nairobi, Kenya
Philconstruct Visayas, 2 – 4 June 2016, Cebu, Philippines
BAUMA, 11 – 17 April 2016, Munich, Germany
Big 5 Saudi, 7 – 10 March 2016, Jeddah, Kingdom of Saudi Arabia
The 3rd Annual Roads & Highways Conference, 7 – 9 March 2016, Kuala Lumpur, Malaysia
CCA Expo, 3 – 5 December 2015, Phnom Penh, Cambodia
Building & Construction, 26 – 28 November 2015, Yangon, Myanmar
IQM Conex, 27 – 28 October 2015, Putrajaya, Malaysia
Uzcomak, 20 – 22 October 2015, Tashkent, Uzbekistan
Philconstruct, 8 – 11 October 2015, Manila, Philippines
Kazcomak, 16 – 18 September 2015, Almaty, Kazakhstan
ConMach, 11 – 14 March 2015, Lagos, Nigeria
Big 5 Saudi, 9 – 12 March 2015, Jeddah, Saudi Arabia
Bauma Conexpo, 15 – 18 December 2014, Delhi, India
AABI National Summit, 5 – 7 December 2014, Solo, Indonesia
Bauma, 25 – 28 November 2014, Shanghai, China
PMV Live, 17 – 20 November 2014, Dubai, United Arab Emirates
Saudi Build, 10 – 13 November 2014, Riyadh, Kingdom of Saudi Arabia
Philconstruct, 5 – 8 November 2014, Manila, Philippines
Construction, Power, and Mining, 30 Oct – 1 Nov 2014, Yangon, Myanmar
IQM Conex, 14 – 15 October 2014, Putra Jaya, Malaysia
ROAD, 13 – 15 October 2014, Moscow, Russia
CamBuild, 10 – 12 September 2014, Phnom Penh, Cambodia
BuildExpo Africa, 2 – 4 May 2014, Nairobi, Kenya