RESEARCH OF PHYSICAL AND CHEMICAL CHARACTERISTICS OF CHROMIUM- CONTAINING SLUDGE

Galvanic sludge generated during wastewater treatment of electroplating industry, are industrial waste, which are the main sources of heavy metals in the environment. The composition of galvanic sludge is not constant and depends on the composition of the treated wastewater. The object of the study was slimes of galvanic production ofLPC-3 “ArcelorMittal Temirtau”. The results of X-ray analysis of galvanic sludge are characterized by the predominance of the main phases of chromium compounds with iron and impurity com­ponents, in particular zinc with a sulfate component. The overall mineralogical structure of chrome-containing galvanic slimes is characterized by the predominance of a dark mass-like structure of chromite and chrompicotite minerals. Observed minerals zinc structure, as well as the inclusion of chromic. The results of thermody­ namic modeling of the working system showed that in the low-temperature region, the maximum formation of NiCl₂ is up to 99.5 % at T = 500 K. As the temperature rises from 1000 to 1500 K, a noticeable redistribution of oxygen and chlorine is observed, which is characterized by the formation maximum of NiO-78.3% and HCl -76.3 % at T = 1200 K and p = 0.01 MPa. Analysis of the equilibrium distribution of chromium at pressures of p = 0.01 and 0.101 MPa is characterized by insignificant changes in the degree of chlorination with the formation of CrOCl₂, CrCl₂,

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