Treatment technique of manganese-containing wastewater in wet electrolytic manganese production process

Abstract

The invention relates to a treatment technique of manganese-containing wastewater in a wet electrolytic manganese production process, which comprises the following steps: mixing, calcium removal, reduction, neutralization, floatation, ultrafiltration membrane filtration, reverse osmosis membrane filtration and the like. The technique overcomes the defects in manganese-containing wastewater treatment in the prior art, has the advantages of advanced and reliable technique, high tolerance to wastewater quality fluctuation and stable effluent water quality, recovers ammonium, manganese and other valuable substances, and implements sustainable development of the environment and cyclic utilization of resources.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a treatment process for manganese-containing waste water in the wet electrolytic manganese production process. Background technique [0002] In recent years, my country has gradually developed into the world's largest producer, exporter and consumer of electrolytic manganese. During the production process of wet electrolytic manganese, a large amount of waste water from plate washing, tank cleaning and diaphragm cloth cleaning, plate washing waste water from electrolysis workshop, ground washing water, washing water from filter press workshop, filter cloth washing waste water, leachate from slag storage, etc. will be produced in large quantities. Wastewater, where Mn 2+ The concentration is 700~2000mg / L, NH 4 + The concentration is 500~2300mg / L, Ca 2+ Concentration 100~700mg / L, Cr 6+ The concentration is 0-10mg / L, and the SS concentration is 20-100mg / L. These wastewater...

AI Technical Summary

Problems solved by technology

Its technical plan did not notice that the water quality of the manganese-containing comprehensive wastewater and the leachate of the slag field is very complicated. In addition to a large amount of manganese ions, ammonium ions, and sulfate ions, the wastewater also contains calcium ions, magnesium ions, electrolytic process or equipment floor Flushing will also bring out grease organic matter, and humic acid organic matter in the leachate of the slag field. If passivation with chromium is used, a certain amount of hexavalent chromium ions will also be contained in the manganese-containing wastewater.

In the manganese-containing wastewater system containing sulfate, the presence of calcium and magnesium ions will cause scale and membrane plugging risks for nanofiltration and seawater desalination membrane filtration concentration, and organic matter and humic acid will both affect microfiltration, nanofiltration, seawater desalination Membrane fouling and membrane blocking; hexavalent chromium in wastewater has strong oxidative properties, which will cause oxidative damage to nanofiltration membranes and seawater desalination membranes. In the above systems and treatment methods, manganese-containing wastewater directly enters microfiltration, nanofiltration, Seawater desalination membrane systems do not have any effective measures and means for the damage of oxidative hexavalent chromium, organic film plugging, and calcium and magnesium hardness affecting membrane operation. In fact, it is difficult to operate and use in actual production.

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