Fearless shredding

For the processing of toxic, corrosive and sometimes flammable waste streams, it simply cannot be a standard off-the-shelf shredder. The Siam City Cement subsidiary Ecocycle in Hon Chong (Kien Giang Province, Vietnam) took up the challenge and found the right technology partner in WEIMA. Toxic hazardous waste now ends up in the calciner for cement production after shredding, instead of in the landfill.


The production of industrial goods often generates large quantities of waste, some of which is highly toxic. The environmentally sound disposal of this hazardous waste poses major hurdles for Vietnam and its companies.

INSEE Ecocycle, formerly Geocycle Holcim, is a leading provider of waste management solutions in Vietnam. To meet the challenges posed by climate change, increasing urbanization and dwindling natural resources, the company specializes in the sustainable treatment of industrial waste as well as hazardous waste, and also offers complete solutions for waste assessment and logistics.

WEIMA PowerLine 1500 shreds hazardous waste for INSEE Ecocycle in Vietnam

WEIMA PowerLine 1500 waste shredder in Vietnam

As a subsidiary of the Siam City Cement Group (SCCC), INSEE pursues the goal of producing high-quality building materials in the most sustainable way possible. Siam City Cement is a leading manufacturer of cement products and other building materials with headquarters in Bangkok and a network of group companies in Thailand, Cambodia, Vietnam, Bangladesh and Sri Lanka. The regional player has relied on the WEIMA brand for several years and already uses WEIMA single-shaft shredders for municipal solid waste (MSW) shredding in Thai cement plants.


Special treatment for special waste

In addition to industrial waste, hazardous waste is also processed at the Vietnamese cement plant in Hon Chong. The term hazardous waste refers to waste materials that exhibit certain hazardous characteristics (these include flammability, reactivity, corrosivity, toxicity). They often pose a risk not only to health but also to the environment. When treating these hazardous substances, it is therefore essential to ensure that they are destroyed in a safe and environmentally sound manner. A major challenge in the processing of this highly contaminated waste is posed by the aggressive properties of the material. For proper waste processing as part of calcination in the rotary kiln, an extremely robust shredding solution is therefore required.

WEIMA PowerLine 1500 with hydraulic drive shreds hazardous waste for calcination in rotary kilns

WEIMA PowerLine 1500


Wanted: A fearless shredder for hazardous waste materials

The requirements of the Vietnamese cement manufacturer: A compact, low-maintenance machine that shreds hazardous waste to a defined particle size as a single-stage processing solution. For this important task in pre-processing, WEIMA was commissioned to install a robust, high-throughput PowerLine 1500 single-shaft shredder.

In order to ensure safety and to shred the particularly critical waste, such as sludge, textiles contaminated with oil, contaminated solid waste and activated carbon, to a homogeneous particle size, a slow speed of 65 rpm is used. With a working width of 1,500 mm and the universally applicable PowerLine rotor, a total material throughput of five tons per hour is achieved.

PowerLine rotor knife and counter knife

PowerLine rotor knife and counter knife

Concha Vautid no rotor PowerLine

Proteção contra o desgaste do rotor Vautid


Extreme demands on machine and drive

The special benefit here is that the waste is fed into the WEIMA shredder by a gripper – untreated, unsorted and without pre-shredding. To meet the extreme requirements, WEIMA used particularly efficient and robust technology, such as the proven hydraulic drive and wear-reinforced designs of individual machine components.

The 18-ton industrial waste shredder is driven by an innovative hydraulic drive from Hägglunds Bosch Rexroth with an output of 200 kW. The hydraulic drive has a crucial advantage for this application: Since it does not have a classic gearbox that is subject to wear from impacts, it is faster to react and less sensitive to shocks from foreign materials.

V-rotor with grooved knife pockets

V-rotor with milled knife pockets


However, not only the throughput but also the particle size of the crushed material is essential. After all, the extremely high temperatures in the cement kilns can only be achieved in a constant manner if the quality of the material is right. With a round hole screen, the shredder achieves a constant particle size <150 mm. In order to withstand the continuously high loads, the screen segments are made of particularly wear resistant Creusabro steel.

PowerLine screen segment


From pre-processing to co-processing

In pre-processing, the hazardous waste is shredded to a standardized size and then sorted and filtered. The shredded material is transported to the cement kiln via an automatic loading system using a gripper and a closed conveyor belt, where it is used in co-processing.

Shredded hazardous waste is transported by conveyor belt system

Delivery by conveyor belt

The high temperatures and long residence time in the kiln ultimately destroy the last toxic residues completely. Co-processing thus makes it possible to avoid landfilling and incineration of hazardous waste. INSEE Ecocycle also minimizes the use of fossil fuels and consequently reduces greenhouse gas emissions. In addition, the cement manufacturer can reduce energy costs and live up to its own principles of preserving natural resources for future generations.



WEIMA Maschinenbau GmbH

Bustadt 6-10

74360 Ilsfeld


Additional Information


More than 40,000 machines sold worldwide! WEIMA has been manufacturing robust shredders and briquetting presses for the disposal and processing of all types of waste for more than four decades. Our machines include single-shaft shredders, four-shaft shredders, cutting mills and briquette presses. The popular blood orange machines are used in the wood, plastics, paper, metal and waste-to-energy industries.

Made in Germany. Built for the world.

Shredders and briquette presses from WEIMA are exclusively made in Germany and come from production plants in Saxony-Anhalt and Baden-Wuerttemberg. Every year, more than 300 employees work on around 1,200 customer solutions from around the globe. We have long-standing sales and service locations in the USA, Poland, India and China. More than 80 representatives supplement this global presence.

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