exhaust pickling bath for stainless steel --> neutralization with Ca(OH)2 to precipitate metals as hydroxides. The pH for precipitation is high (9-10) and molybdenum is (or transform) in molybdate form and doesn't precipitate. The mud produced in this way is filter pressed and sent to the rubbish dump. Italian law imposes limits on water leachability of Mo in mud (1 ppm with solid/water ratio = 1:10). Our molybdate, that is "blocked" in the mud, is soluble and its leachability is high... The disposal becomes expensive$$$$$... I'd like to succeed in the "inertization" of the molybdate so that it remains in the mud...

Anyone with the same problem?