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Copyright © 2017 DK Recycling
und Roheisen GmbH, Duisburg.

Preparing samples

In order to analyse the composition of waste materials, raw materials, sintering, slag and blast furnace dust samples precisely, they are dried, milled, and pressed to a pill by adding a binding agent under high pressure.
Preparing samples
 

Laboratory

The laboratory is of crucial importance within the DK process, and fulfils two decisive tasks.

Carrying out analyses grants a consistent monitoring of the DK process from the waste material till the finished product to manufacture the best pig iron possible.

Chemical analyses in the environmental protection area guarantee that present regulatory requirements are observed thanks to our regular self-monitoring system.

 

As the DK process is taking place 24 hours a day; therefore, the laboratory has also to be continuously run by qualified staff.

All samples dedicated to production monitoring are sent to this place via pneumatic tube, and are entered into the networked IT system after the analysis. As analyses' results are supposed to be sent as fast as possible to the individual DK process areas (e. g. sintering plant, blast furnace), the sender can therefore control the respective partial process in an ideal manner.

 

 

Preparing samples

In order to analyse the composition of waste materials, raw materials, sintering, slag and blast furnace dust samples precisely, they are dried, milled, and pressed to a pill by adding a binding agent under high pressure.
Preparing samples

X-ray spectral analysis

The samples prepared are quickly analysed with an x-ray fluorescence spectrometer in order to define quantitative and/or half-quantitative parameters according to the requirements
X-ray spectral analysis

Taking samples in the blast furnace

During the blast furnace tapping, a sample is taken out of a ladle of 25 t content and sent to the laboratory for analysis.
Taking samples in the blast furnace

Remelting furnace

Before analysing the pig iron sample, it has to be remelted in an induction furnace using protective gas.
Remelting furnace

Pig iron analysis

In the optical emission spectrometer, the material taken out of the sample surface is vaporised using an electric arc. The pig iron sample composition is defined with the help of an optical system.
Pig iron analysis

Traceability

Each pig iron sample receives a furnace, tapping and ladle number identification. That enables the traceability of each single sample. If requested, DK is pleased to hand over an analysis certificate to customers.
Traceability

Special types of samples

Watery samples, and samples that cannot be analysed with the already mentioned devices, are converted into soluble form by using acids.
Special types of samples

In liquid form

Now that the sample has become liquid, it will be analysed with an atom absorption spectrometer, or further processed according to traditional analyses' regulations.
In liquid form

Database

The data and results of the single analyses are entered into the database system, and are thus made available for further evaluations. In case of further analyses, the samples are kept for a specific period of time.
Database