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<p>Th<!--Query ID="Q1" Text="Please check and confirm if the authors and their respective affiliations are correctly identified and amend if necessary." Resolved="yes"-->e Târnăveni Chemical Plant was a inorganic chemical plant in Romania. In the good old days, even 6,500 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. In a first stage, the recovery of the chromate and magnesium ions from this sludge were investigated. In the continuation of the valorization process of these slurries, the recovery of calcium is pushed. Calcium recovery is achieved by leaching with ammonium chloride.</p>

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

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  • 发表日期：

    2025年6月4日

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  • Camelia Traistă,
  • Eugen Traistă,
  • Maria Lazăr,
  • Alexandru Mihai,
  • Dan C. Petrilean

摘要

The Târnăveni Chemical Plant was a inorganic chemical plant in Romania. In the good old days, even 6,500 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. In a first stage, the recovery of the chromate and magnesium ions from this sludge were investigated. In the continuation of the valorization process of these slurries, the recovery of calcium is pushed. Calcium recovery is achieved by leaching with ammonium chloride.