ADSORPTION TREATMENT OF WASTEWATER GENERATED DURING THE DEMERCURIZATION OF MERCURY-CONTAMINATED SOILS

The soils of industrial enterprises operating plants for the production of chlorine and alkali with a mercury cathode are contaminated with mercury. Demercurization of the soil leads to the formation of mercury-containing wastewater. To remove mercury from wastewater, an adsorption method is proposed using a sorbent based on lignin, organochlorine waste, and sodium polysulfide

Selection of Corrosion Resistant Construction Materials for Caustic Soda Production Equipment

The article considers the corrosion resistance of domestic and foreign materials, both the base metal and welded joints in the media of concentration of electrolytic alkalis in the range of NaOH concentrations from 12% to 99.5% and temperatures from 115 to 395°С. For testing, specimens of 2080 mm in size with transverse welds with two drilled holes were made from the material under study. polished and assembled into cassettes using nickel alloy rods. For the first time, comparative data on the corrosion state of structural materials during evaporation of electrolytic slits obtained by diaphragm electrolysis and electrolysis using a mercury cathode were obtained. The results of corrosion studies are quite well corrected with the experience of operating nickel pipes at the first stage of alkali concentration. The electrochemical heterogeneity of welded joints of alloys 33 and 201 was evaluated. The conducted studies of the corrosion resistance of alloys 201 and 33 under conditions of evaporation of NaOH obtained by mercury electrolysis confirmed the high corrosion resistance of nickel alloy 201 at the main stages of alkali concentration. The research results can be used as recommendations for the development of structural materials.