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Reststoffstroeme der metallerzeugenden und -verarbeitenden Industrie. Teilvorhaben 2: Entwicklung und Erprobung von Verfahren zur Rueckgewinnung von Fluss- und Schwefelsaeure im Tantal-Chemie-Prozess sowie von Natronlauge und Schwefelsaeure im Wolfram-Chemie-Prozess im Werk Goslar der HCST Abschlussbericht

By P. Hobein and Goslar (Germany) Starck (Hermann C.) Berlin

Abstract

The project was to develop processes to reduce wastes of two different processing facilities: - In the hydrometallurgical processing of Tantalum containing ores and HF and H_2SO_4 containing effluent stream has to be neutralized with lime. Thus annually a mixture of about 9.000 tons CaF_2 and CaSO_4 contaminated with oxides by metals of Mn, Fe, Ti are produced. A new process has been developed to decompose the effluent waste by pyrohydrolysis in a fluid bed reactor. Thus reducing the amount of sludge of about 90% and to recover the F contents in form of HF. - In the hydrometallurgical winning of APT big amounts of Na_2SO_4-conting wastewater arise. It was demonstrated that it is possible to convert the dissolved salt into the main chemicals NaOH and H_2SO_4 by application of the electrodialysis with bipolar membranes. (orig.)SIGLEAvailable from TIB Hannover: F96B506+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Topics: 03I - Waste recycling (non-nuclear), waste recovery, 11F - Metallurgy, metallography, METALLURGY: M, RECYCLING: M, ELECTRODIALYSIS: M, FLUID BED REACTORS: M, WASTE TREATMENT, WASTE UTILIZATION, WASTE WATER, TANTALUM, TUNGSTEN
Year: 1995
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Provided by: OpenGrey Repository
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