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Research on the Valorization of Green Sludge Resulting from the Manufacture of Sodium Dichromate in Romania

2023; Springer International Publishing; Linguagem: Inglês

10.1007/978-3-031-25840-4_57

2524-3438

Traistă Camelia, Traistă Eugen,

Metal Extraction and Bioleaching

The Târnăveni Chemical Plant was a inorganic chemical plant in Romania. In the good old days, even 6500 employees worked here. When it was productive, the Chemical Plant produced a lot of inorganic products such as: sodium bichromate, potassium bichromate, barium salts, chromium salts, or zinc oxide. In 2002, the plant was closed and taken over by AVAS. The sodium (potassium) dichromate manufacturing process results in a tailings called green slime. The tailings deposited in the landfill are strongly contaminated with dichromate ion, as a result of the process of manufacturing chromium salts. This ion, according to the statistics, is found in the material in a concentration of 1.73–2.20%. This concentration is enormous, taking into account the existing environmental protection regulations. The present paper presents the initial phase of research regarding the removing of this waste.