RELATIONSHIPS OF THE NEUTRALIZATION OF CONCENTRATED CYANIDE WASTEWATERS OF ELECTROPLATING FACILITIESWITH THE SYNTHESIS OF PIGMENT MATERIALS OF MIXED HEXACYANOFERRATES OF TRANSITION METALLS
Results of investigation of the neutralization of concentrated cyanide wastewaters (used cyanide electrolytes of copper and zinc plating) resulted in pigment materilas of mixed hexacyaniferrates of iron (III), zinc and copper are presented. Relationships of the process of disposal of cyanide containing wastewaters resulting in the production of pigment materials were established based on the thermodynamic analysis and experimental investigation of the decomposition of cyanide complexes of copper and zinc with the formation of ferrocyanide complex compounds. Found that the samples of pigmented on the main characteristics: (coverage, oil absorption, the degree of grinding) of the standard to meet the requirements of the pigment «Prussian Blue». Substantiated the main technological parameters of the process of neutralization of waste water and the method of synthesis of pigment materials from waste cyanide electrolytic copper plating and galvanizing.