Presentation

Zinc production at KCM S.A. is carried out under a classical hydrometallurgical technology and it includes:

• Oxide roasting of sulphide zinc concentrates;
• Double-staged neutral and acid leaching of the zinc calcine;
• Purification of zinc sulphate solutions from impurities;
• Electroextraction;
• Cathode zinc melting;
• Casting into zinc ingots.

The sulphuric gases from the roasting process are treated to obtain sulphuric acid under a modern technology with double-staged contacting and double absorption.

The insoluble residues after the wet leaching of the zinc calcine are treated in Waelz kilns.

The final zinc calcine leaching results in obtaining 96.50 - 97.00% zinc.

Zinc ingots	75 000 t/y
Sulphuric acid	118 000 t/y
Zinc sulphate “A”	1 000 t/y
Zinc sulphate “B”	1 000 t/y
Zinc sulphate – monohydrate	4 200 t/y
Cadmium	300 t/y

Number	595
Educational qualification
Higher education	75
Semi-higher education	5
Specialized secondary	218
Secondary	226
Elementary	71