Recycling salt slag, refilling salt flux stocks, filter dust disposal. If you can take care of all these with a single call, then you are probably already our customer.
Why? Because only K+S offers all these services from a single source.
Comprehensive service for the secondary aluminum industry
The REKAL® plant is situated less than 200 meters from the winding shaft where the raw materials for the salt flux originate. Just next to that is the potash tailings pile, which has been recultivated using a substrate made from your salt slag. As you can see, we get the bigger picture and strive to create a system that can add value on multiple levels:
- A single point of contact for all services
- Considerable recycling capacity and salt flux quantities
- Safe and clever utilization and removal of filter and grinding dust in decommissioned sections of K+S potash mines
- Maximum recycling rate due to open circuit and regular customers for salt slag
- Great salt flux quality
- Simplification of transport and handling, even international (including avoidance of empty trips through combined acceptance and delivery)
A precondition for the efficient recycling of aluminium is preferably a clean and dry salt flux with an ideal smelting point. And we have tonnes, directly from our company’s own mines.
K+S supplies high-quality salt fluxes to the secondary aluminium industry. Thanks to a residual moisture content of under one percent and a precisely definable smelting behaviour, Montanal® and Alasal® are the best choices for maximizing metal recovery.
Large quantities are always available, because the salt flux base materials are obtained not only from the potash plants of the K+S Group, but also from our own REKAL® plant, both of which should be productive into the coming centuries. And in case the salt you need has to meet more specific requirements, we would be happy to look into whether a customized salt mixture would provide the ideal solution.
Repurposing the material contained within salt slag is a good thing. Following the recycling concept all the way to the end is even better.
K+S completely utilizes salt slag from the secondary aluminium industry. And when we say completely, we mean completely, in its entirety, one hundred per cent. Our REKAL® facility developed in-house extracts the recyclable aluminium from the slag. The process is rounded out as the materials potassium chloride, aluminium oxide and ammonium sulphate are repurposed as follows:
- The potassium chloride is processed into first-class salt fluxes and fertilisers in the potash plants of the K+S Group
- Ammonium sulphate is made into fertiliser
- We use our own patented process to transform aluminium oxide into a substrate for the recultivation of the potash tailings pile at Sigmundshall
At our REKAL® plant we also recover the aluminium contained in salt slag. Aluminium granulate with a purity of about 70 percent is produced. This is a wiser alternative to the energy-intensive production of primary aluminium.
Delivery and Billing
Salt slag as well as salt fluxes and aluminium granules can be transported loosely as bulk goods, eliminating the need for vehicle cleaning. The majority of the trucks can then transport the salt flux and aluminium granulate on the return trip, which adds up to fewer empty runs.
As a contract customer, you determine the actual aluminium content of the granulate, which is then used as the basis for billing. For short-term deliveries, we will negotiate a fixed purchase price.
As efficient and resource-conserving as the recycling of aluminium is, without waste it unfortunately would not work. The filter dust resulting from the melting process, depending on its composition, ends up at our underground recovery or underground waste disposal plants.
As experts in the sensible recovery and safe disposal of waste, we also take care of dust generated in the secondary aluminium industry including packaging and transport should you require it.
Grinding dust from dross processing is generally suitable for underground recovery. Even with residues from exhaust air filtering, chances are good that it can be reutilised. For other cases, the toxic dust can be safely and permanently isolated from the biosphere in our underground waste disposal plants.