Modern production plants for assured quality

Our plants are controlled from centralized master control stations with process control systems. This ensures economical and, in particular, energy-efficient production.

The integrated quality management system based on international standards guarantees both compliance with the quality standards established and agreed upon with our customers and a constant preparedness to deliver.

Firing plants

Firing plants

We have a firing capacity of 930,000 tons of lime in a total of 10 kilns. The kilns have daily capacities of between 100 and 600 tons and are heated with natural gas or pulverized coal, depending on design and especially on the required quality standards.

PCC Plants

PCC Plants

The introduction of carbon dioxide into our milk of lime causes calcium carbonate crystals to precipitate. Depending on the type of reactor and how the process is controlled, a wide variety of crystal structures and particle shapes can be produced, differing significantly from those in naturally occurring limestone. We produce customized PCC powder and slurry grades in various production lines with a global output of approximately 442,000 tons.

Grinding / hydrating and lime milk plants

Grinding / hydrating and lime milk plants

Limestone grinding mills with an annual capacity of 525,000 tons and hydration plants with an annual capacity of 370,000 tons are available for further processing. In addition to powdered calcium oxide and calcium hydroxide, milk of lime is produced in various solids concentrations using slaking technology patented by SCHAEFER KALK.

Limestone grinding mills and high-grade chippings production

We produce unburnt lime products in limestone grinding mills with an annual output of 80,000 metric tons and high-grade chippings plants with an annual output of 120,000 metric tons.

Premixed dry mortar plant

Premixed dry mortar plant

In a modern mixing plant with an output (capacity) of 80,000 tons per year, high quality premixed dry mortars are produced in contract manufacturing according to specially developed formulations.

Raw material limestone

High-quality raw material deposits, the essential prerequisite for good quality, are secured on a long-term basis. The Hahnstätten quarry provides us with one of the purest limestone deposits in Europe. It consists of 350 million year old compact limestone from the Devonian period with only minimal quantities of secondary minerals. With selective extraction and careful product controlling, we produce a raw material for lime products that meets the highest requirements. Our limestone deposits at the Hahnstätten and Steeden plants ensure that we are able to meet all quality requirements. At all our sites, the raw materials have been secured for many years or decades.

Extraction

Approximately 2.7 million tons of limestone are extracted annually from our quarries using the most modern blasting methods, thereby conserving resources to the greatest extent possible. Powerful surface drilling rigs, excavators, heavy-duty trucks, dumpers and wheel loaders are used to extract the limestone. The limestone obtained in this way is crushed, sieved, where necessary washed and then prepared in precisely defined grades for further processing, or directly loaded and shipped for our customers.

Outline of the production process