Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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TECHNOLOGY AND EQUIPMENT FOR NEUTRALIZATION OF MERCURY-CONTAINING SOLID WASTES

Yablokova M.A. 1 Garabadghiu A.V. 1 Ponomarenko E.A. 1
1 Saint-Petersburg State Institute of Technology (Technical University)
The review of modern technology of demercurization of solid wastesis performed. The urgency of this problem for large cities with lots of solid wastes contaminated with mercuryis shown. Thermal, hydrometallurgical (liquid-phase) and dry nonthermal ways of demercurizationare reviewed as wellas a modern trend sharing for disposal of mercury-containing wastes of liquid chemical demercurization drugs and inert solid fillers, and sometimes even binders. It is shown that the known methods of demercurization of sorted waste containing mercury are not suitable for disposal of household waste and municipal waste, not subjected to preliminary sorting. The technological scheme is proposed fordemercurization of mercury-containing solid wastes at the rubbish-sorting stations, including grinding solid wastes in a rotor-knife crusher, and if necessary in acage mill. Crushed mercury-containing waste is treated in the drum mixer by active chlorine for transfer of mercury from metal droplet form into ions Hg2+ , and then –by calcium polysulfide solution for obtaining the environmental safety sulfide of mercury. The method allows to transfer I class of hazardouswaste into IV class waste suitable for disposal at landfills or used as fillers in manufacture of some construction materials.