A hybrid ZLD process was developed for an effluent from a Molybdenum production facility containing among others ammonium sulphate, sodium chloride, as well as magnesium and potassium sulphates. The process is foreseen for a waste water capacity of up to 110m3/h. The process consists of a pre-treatment section with brine purification, followed by a reverse osmosis pre-concentration and further concentration in a falling film mechanical vapour recompression evaporator. A crystallizer and a solid separation complete this process, which produces pure water for the re-use in the production facility under ZLD conditions. The selected materials of construction are stainless steels of different alloyed qualities, dependent on the concentration factor, for all solution-sided exposures. Plastic materials had been used as far as possible. All materials of construction were found to be completely resistant. The linked paper is by GEA, the supplier. It is posted courtesy of Industeel is one of the companies capable of supplying the alloyed steels used in the system. Click Here For Complete Article Text
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