How to address the issue of fine sludge generated by sodium sulfide precipitation in copper-nickel wastewater, which tends to pass through filters?
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After neutralizing low-concentration wastewater containing copper or nickel, sodium sulfide is used for precipitation; the resulting sulfide precipitates are very fine. In the case of using conventional plate and frame filter presses or diaphragm filter presses, leakage can occur. I would like to ask if there are any more precise filtration devices available, or if there are any methods to increase the particle size of the sediment sludge
Coagulation can be used to increase the particle size of the sludge, or appropriate filter fabrics can be selected for filtration.
How small is the precipitate? I have a filter that can filter out those larger than 5 microns
Coagulation can be used to increase the particle size of the sludge, followed by sedimentation. Mechanical filtration won’t work
Coagulation method: increase the amount of sludge. I’ve been using a centrifuge; I’m not sure if there is a filter cloth made of a suitable material for use in this case
Metal-sintered filter elements can achieve 1um.
This post was last edited by zhao*ang333 on 2016-1-18 at 10:17: First coagulate, then settle by centrifugation!
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Under slightly acidic conditions, after sulfidation without the presence of hydrogen sulfide, the flocs formed without the need for any flocculants are quite large; as a result, their natural settling and filtering properties are excellent. To date, no metal sulfide precipitates that are small enough to pass through filters have been observed. If the precipitation conditions remain unchanged, try changing the filter media.