ZADCON GmbH was founded as an engineering office in January 2000 by former design engineers of the HWZ GmbH. HWZ, a subsidiary of the Cologne-based HUMBOLDT WEDAG, was formed from the ZAB Company in Dessau, which in turn was formed from the Company Polysius. Machines and equipment for the cement industry and mineralogical industry have been built in Dessau for neraly 100 years. The employees at ZADCON GmbH thus have have been trained in this traditional environment and have acquired all their expertise here.

Dessau is the origin of cement plant manufacturing. More than 150 years ago Gottfried Polysius founded his company in this town, and since 1888 they have been building and selling efficient mills for the cement industry. In 1907 the first complete cement plant was shipped to Egypt, followed by another plant sent to China only one year later. After World War II Polysius had his company expropriated and Zementanlagenbau Dessau (ZAB) took his place. For several decades, until the collapse of the GDR, ZAB shipped over 350 cement plants to destinations worldwide. In 1990 the company became a subsidiary of the Cologne-based HUMBOLDT WEDAG. From there former head of construction, Dipl.-Ing. Karlheinz Schäfer, and a group of experienced design engineers and process engineers founded the ZADCON GmbH in 2000.
The employees of ZADCON have have been trained in this traditional environment and have acquired all their expertise here. Using these skills, we offer reliable services, that fit the needs of our customers. Our services include i.a. development, construction, implementing and distribution of machines and facilities for construction trade and the chemical, mineralogical and binders industry.
We offer customized solutions for special requests of our customers. Furthermore we construct spare parts for existing facilities, ship them, and optimize them on request. Our employees have decades of technical expertise in engineering at their disposal. On the 1st of December 2015 Oliver Kahe became our new director. Dipl.-Ing. Karlheinz Schäfer will stay with us in an advisory position. This change, and an expanding workforce will ensure the continuing growth of the engineering office ZADCON. Carrying on excellent German craftsmanship, quality, customized solutions and punctuality, these are and will always be our core values here at ZADCON.

Zadcon Logo

The History

Your contacts:

Cornelia Schulz
+49 340 5029740

Support / Distribution:

+49 340 5029206

Service / Assemblies:
Tony Redlich
+49 340 5029539

للمنطقة العربية
المهندس سيبان خليل
مهندس مشروع ومندوب مبيعات للسوق العربي
+49 340 5029505


Message us!


Image Brochure ZADCON, English Version (3.1MB)

Image Brochure ZADCON, German Version (2.6MB)

Image Brochure ZADCON, Russian Version (2.3MB)

Our Expertise - Your Benefits

Our main expertise lies in planning, designing and constructing of facilities.
In that field we specialize in facilities utilizing rotary technology (rotary kilns, rotary dryers, rotary coolers) and related equipment. These pieces are mainly being used in cement and mineralogical industry and bulk solids industry.
We have decades of experience in construction, manufacturing delivery and operation of machines and equipment used in the cement industry at our disposal.
The engineering office ZADCON GmbH was founded by former designers of VEB Zementanlagenbau Dessau, who was direct successor of Polosyius AG and was stationed at the Brauereistraße 13, a traditional location for manufacturers of equipment used in cement industry.
After the reunion of Germany ZAB Dessau joined the HUMBOLDT WEDAG GmbH from Cologne, from which ZADCON emerged on the 1st January 2000.

Solid German engineering in the field of system engineering along with quality, customized solutions and punctuality.

Constructive solutions fit to your personal needs, even for unusual problems and niche products.

Because of our cooperation with famous universities, research centers and special laboratories we offer state of the art technology and future-oriented solutions.

We also use reliable existing networks to implement large-scale projects.

Our Scope of Work

Take advantage of our know-how and use our posibilities!

machines, drafts, foundation drawing, assembly drawing, documentation

Procedural design / dimensioning

Rotary Kilns
direct: cement, lime, gypsum, gypsum sulfuric acid, clay, expanded clay, refractories, phosphate, zinc oxide, titanium oxide, aluminium oxide, aluminium hydroxide, siderite, kaolin-bauxite-compounds, aluminium calcination, recycling of zinc, recycling of asbestos concrete, clearing sludge, oil sludge, hazardous waste, activated carbon,
indirect: hydrofluoric acid, petrol coke

Pyrolysis Kilns
waste, torrefaction of biomass, scrap tyres, activated carbon, charcoal, miscellaneous

Rotary Dryers for Bulk Solids
direct current or counter current method

Direct Drying
rotary dryers with different built-in components bucket components, arch components, segment* components

Indirect Drying
Material and hot gas are seperated.

Indirect Drying
steam dryer

direct cooling, rotary cooler with different built-in components, indirect cooling using air or water in tube coolers or sectional coolers

Heat Exchangers / Preheaters
cyclone preheaters (multi-stage), shaft preheaters, flash dryers with or without impact reduction

Chambers for Sedimentation of Dust

Post-combustion Chambers

ZUS (ZADCON separator using recirculating air),
ZHZS (ZADCON high performance centrifugal separator)



Furnace Shells
carbon steel, stainless steel, refractory lining

loose, welded, screwed, toothed, forged or cast bandages

casting or steel constructions, bridgemountings, connections with clamps, pinions and shafts, bearings, sprocket protection, heat protection, base frames

main drives, main engines, base frames, heat protection, auxiliary drives, overrunning clutches, auxiliary engines, chain drives, friction wheel drives

with shrunked shafts, cast or forged, with rolling bearings, with anti-friction bearings, as a single bearing, as double bearing, base frames, heat protection

Pressure Trestle
stationary, single pressure trestle two rolls, longitudinal kiln guidance, Zwolf (parallelogram), electric, hydraulic, HDR, hydraulic unit, control unit box, base frame

Kiln Outlet Sections
plain, cooling section, disc outlet section, plain, for cooling section, with concrete attachment, outlet cooling section

Kiln Sealings
spring plate sealing, pneumatic sealing, pull-rope sealing

Kiln Inlets and Outlets
cavities, air cooled, water cooled, plain, lined, chutes, plain, water cooled

inlet casings, outlet casings, temporary casings

for gas inside plants

Brick Holding Rings
compensators, hot gas valves


Our experienced designers use CAD workstations and modern software to work on a broad range of problems like designing machines or different components, optimizing spare parts or different fields of research and development.


At ZADCON, our own experts work at procedural dimensioning of rotary machines and their accessories. Furthermore we work closely with the Institute of Fluid Mechanics and Thermodynamics of the Otto von Guericke Universität in Magdeburg, and with Prof.Dr.-Ing. Specht and Jprof.Dr.-Ing. Herz in particular, and a number of other universities, colleges, research facilities and specialized companies.

Institute of Fluid Mechanics and Thermodynamics


ZADCON is not bound to any particular manufacturers, even though we work closely with several excellent partners, some of them near our headquarters. Because of our way of working, we have both: quality and short distances. Production control and inspection is being handled by our specialist engineers.


Our products are shipped worldwide and assembled locally by specialist installation companies.


Our support writes expertises for existing plants, replaces broken or wear parts and optimizes facilities. They also work at assembling our machines, and offer advice on questions concerning process engineering. Furthermore they are active around the world to support operators of plants, that have been built by ZAB Dessau.


We ship spare parts and constructional components for mechanical and systems engineering around the world. Spare parts include pinions, bearings, shafts, tyres, carrying rollers, girth gears and many more.

Service and Assemblies

Our department "Service and Assemblies" is responsible for the development of expert opinions on existing plants, the exchange of defective plant components as well as the optimization of plants, but also for the installation, commissioning and consulting on questions of process engineering.
Furthermore we offer worldwide support for operators of plants which have been built by ZAB Dessau.

More ...


We design, manufacture, and ship:

Rotary Kilns

Rotary kilns designed and manufactured by us are used for the thermal treatment of various bulk solids.

Multitube Coolers

Tube coolers are mainly used to cool free flowing and fine-grained bulk solids. Tube coolers* can be considered a kind of indirect flash cooler, for the coolant does not come into contact with the bulk material.

Cooling Drums

Flash coolers are a kind of direct rotary cooler, and are mainly used to cool free flowing and fine-grained bulk solids, but also to cool agricultural products like beet or sugar beet cuttings, dry leaves, soilage, pressed pulps and grain.

Sectional Coolers

Sectional coolers are used to cool fine-grained or coarse-grained bulk solids. The heat is extracted when the bulk solids come into contact with cool sectional surfaces*. Sectional coolers can be considered a kind of indirect drum cooler.

Pyrolysis Kilns

Pyrolysis takes places in an evacuated environment. Pyrolysis kilns are often used for waste pyrolysis, and other processes involving pyrolysis.

Rotary Dryers

Dryers made by ZADCON GmbH are both used to dry easy-to-dry materials (sand, gravel, waste glass) and hard-to-dry materials (e.g. clay).

Tube Mills

Tube mills are mainly installed in the form of ball tube mills, meaning they utilize ball charges. In some cases rods may be used for milling.

Longitudinal Kiln Adjustments

Longitudinal kiln displacements are used for the axial displacement of rotary kilns, dryers and drums for a uniform load and wear of the surfaces of the girth gear/pinion or of the tyres and carrying rollers.


Separators are used for sizing i.e. separating fine-grained builk solids into grain-size categories. This is often needed in connection with crushing units, or with special tasks like producing bulk solids for distributing dust.


In this context, it means sealing a rotating tube towards a fixed inlet or outlet. ZADCON offers different kinds of sealing, each optimized for the conditions it will be used under.

Further components

Parts for machines and plants related to the above mentioned main units.

Spare Parts

We ship spare parts for plants produced by ZAB Dessau.




Rotary Kiln


Rotary Dryer



Kiln Head


Our competitive edge comes from our employees. That is why we are always looking for both experienced professionals and graduates. We want people who always aim for outstanding results, who think analytically and who work well in a team. We work in a constantly changing environment, with new challenges every day and we need people who can grow with these challenges. Unsolicited applications are always welcome.

Job offers:
Granting of Degrees:
Industrial Placements:

We are looking for trainees for our team. They assist our employees in analysing, drafting and executing their projects. After gaining some experience, they get to lead small projects of their own for some of our departments. They will gain broad knowledge about the manufacturing of plants and machines, and they will be able to apply the things they learned at college in a practical environment.