The prerequisite for a rational detoxification, or transformation into useful products of steel carburizing wastes is the knowledge of their detailed composition. A sequential analytical procedure was developed which enables performing the analyses without, either mutual interference of the constituents or the formation of artifacts.

Sequential procedure contains the following steps:

a) Water extraction from materials and analyses of obtained extracts;
b) Determination of components in rest of water extraction;
c) Extraction of rest with 6M HCl and analyses of obtained solution.

Sequential extraction was followed by IR-spectroscopy: all solid rests were analyzed. IR-spectra were in compliance with the contents of waste components.

There were macrocomponents (Na, K, Fe, Ba, Cl, CN, CNO, ammonia, carbonate, silicates, graphite) and microcomponents (Ca, Mg, Zn, Mn, Cu, Co, Ni, Cr, Cd, Pb, phosphates, ferrocyanides) in waste materials.

Detoxification procedure was performed through the following steps:

a) Water extraction of waste;
b) Non-solving rest treatment to separate heavy metals from silica-gel and graphite;
c) Transformation of nitrogen containing compounds in water extract into ammonia;
d) Separation of ammonia and potassium from calcium and sodium.

1. Raw material for colour production;
2. Mixture of silica-gel and graphite;
3. Mixture of heavy metal hydroxides;
4. Material for street treatment during winter;
5. NK-fertilizer, which improves ground characteristics.