Aluminium Barren
Secondary aluminum (REKAL)

A use for each component

We are the only company to offer the secondary aluminum industry a complete package: supply of high-quality smelting salts, recycling of salt slag, extraction of aluminum granulate and disposal of aluminum filter dust.


Complete service for the secondary aluminum industry


With a single contact for all services, we offer our customers all services from a single source.

  • High-quality smelting salts at any time, even in large quantities
  • High recycling capacities
  • Maximum recycling rate thanks to open circuit and fixed customers for slag components
  • Safe and sensible recycling and disposal of filter and grinding dust in decommissioned sections of K+S potash mines

Simplification of transportation and handling, also internationally. Avoidance of empty runs due to combined acceptance and delivery.

Montanal® & Alasal® smelting salts

The prerequisite for efficient aluminum recycling is a melting salt that is as clean and dry as possible with an ideal melting point. We have it in large quantities - from our own mines.


K+S supplies high-quality smelting salts for the secondary aluminum industry. Thanks to the low residual moisture of less than one percent and a precisely definable melting behavior, Montanal® and Alasal® stand for maximum metal yield.

Larger quantities can be delivered at any time, because we obtain the basic materials for salt flux from the K+S Group's potash plants on the one hand and from our own REKAL© facility on the other. Both together will be enough for the coming decades. And if the salt has to meet special requirements, we will be happy to check whether an individual salt mixture is the ideal solution.

  Montanal® Alasal®

Mixture of NaCl, KCl and CaF2

Mixture of NaCl and KCl
Delivery method in bulk in bulk

Recycling salt slag

Preparing the substances contained in salt slag for reuse is a good thing. It is even better to think the recycling idea through.


K+S recycles salt slag from the secondary aluminum industry completely residue-free. By this we mean: completely, one hundred percent. Our specially developed REKAL® plant extracts the reusable aluminum from the slag. The process is rounded off by the separated substances potassium chloride, aluminum oxide and ammonium sulfate.

By this we mean: completely, one hundred percent. Our specially developed REKAL® plant extracts the reusable aluminum from the slag. The process is rounded off by the separated substances potassium chloride, aluminum oxide, and ammonium sulfate:

  • Potassium chloride is processed in the potash factories of the K+S Group into first-class smelting salt and fertilizers.
  • Ammonium sulfate becomes fertilizer
  • Using a patented process, we process aluminum oxide into a substrate for the greening of the Sigmundshall potash tailings pile.

Aluminium granulate

In our REKAL® facility, we also recover the aluminum contained in the salt slag. The result is aluminum granules with a purity of about 70 percent. Its use is a sensible alternative to the energy-intensive production of primary aluminum.

Delivery & billing

Both salt slag as well as smelting salt and aluminum granulate can be transported loose as bulk material, there is no need for truck cleaning. The majority of trucks take molten salt and aluminum granulate with them on their way back, which means fewer empty runs.

As a contract customer, you determine the actual aluminum content of the granulate with a sample melt, which then serves as the basis for invoicing. In the case of short-term individual deliveries, we negotiate a fixed purchase price with you.

Filter dust disposal

As efficient and resource-saving as the recycling of aluminum may be, it is unfortunately not possible without waste. Depending on its composition, the filter dust produced during the melting process ends up in our underground recovery plant or the underground landfill.

Entsorgung Filterstaub

As experts for sensible recycling and safe disposal of waste, we also take care of the dust generated in the secondary aluminum industry - including packaging and transportation if required.

Grinding dust from dross processing is generally suitable for underground recovery. There is also a good chance of recycling residues from exhaust air filtration. Otherwise the toxic dust is safely stored in our underground disposal facilities and permanently isolated from the biosphere.


Your contact person

Veith Wehmeier
REKS GmbH & Co. KG
Veit Wehmeier
Head of Sales REKAL (Secondary Aluminium Services)

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