Phekolo ea metsi a litšila a nang le chromium ho electroplating

Papiso ea liphello tsa phekolo ea ferrous sulfate le sodium bisulfite

Ts'ebetso ea tlhahiso ea li-electroplating e hloka ho belisoa, 'me nakong ea tlhoekiso ea masenke, ha e le hantle semela sa electroplating se tla sebelisa chromate, kahoo metsi a litšila a electroplating a tla hlahisa palo e kholo ea metsi a litšila a nang le chromium ka lebaka la chromium plating.Chromium e ka metsing a litšila e nang le chromium e na le chromium e hexavalent, e chefo 'me ho thata ho e tlosa.Hexavalent chromium hangata e fetoloa ho trivalent chromium ebe e tlosoa.Bakeng sa ho tlosoa ha metsi a litšila a nang le chrome-containing electroplating, hangata ho sebelisoa lik'hemik'hale le pula ea pula ho li tlosa.Hangata e sebelisoa ke ferrous sulfate le mokhoa oa ho fokotsa kalaka le mokhoa oa ho fokotsa metsi a sodium bisulfite le mokhoa oa ho fokotsa alkali.

1. ferrous sulfate le kalaka ho fokotsa pula mokhoa

Ferrous sulfate ke asiti e matla ea coagulant e nang le thepa e matla ea ho fokotsa oxidation.Ferrous sulfate e ka fokotsoa ka kotloloho ka chromium ea hexavalent ka mor'a hydrolysis ka metsing a litšila, ea e fetola karolo ea trivalent chromium coagulation le pula, ebe e eketsa kalaka ho fetola boleng ba pH ho hoo e ka bang 8 ~ 9, e le hore e ka thusa karabelo ea coagulation ho Ho hlahisa pula ea chromium hydroxide, phello ea ho tlosa chromate e ka fihla hoo e ka bang 94%.

Ferrous sulfate hammoho le lime coagulant phokotso ea pula ea chromate e na le phello e ntle ho tloseng chromium le litšenyehelo tse tlase.Taba ea bobeli, ha ho hlokahale hore u fetole boleng ba pH pele u eketsoa ka ferrous sulfate, 'me ho hlokahala feela ho eketsa lime ho fetola pH ea boleng.Leha ho le joalo, ka lebaka la palo e kholo ea ferrous sulfate dosing e boetse e baka keketseho e kholo ea seretse sa tšepe, ho eketsa litšenyehelo tsa phekolo ea sludge.

2,.sodium bisulfite le alkali phokotso ea pula mokhoa

Sodium bisulfite le alkali reduction precipitation chromate, pH ea metsi a litšila e fetotsoe ho ≤2.0.Ebe sodium bisulfite e eketsoa ho fokotsa chromate ho trivalent chromium, 'me metsi a litšila a kena ka letamong le felletseng ka mor'a hore phokotso e phethoe, metsi a litšila a pompeloa letamong la taolo bakeng sa ho lokisoa,' me boleng ba pH bo fetoloa hoo e ka bang 10 ka ho eketsa alkaline. nodes, ebe metsi a litšila a tšeloa ka tanka ea sedimentation ho fokotsa chromate, 'me sekhahla sa ho tlosoa se ka fihla hoo e ka bang 95%.

Mokhoa oa sodium bisulfite le alkali reduction precipitation chromate o molemo bakeng sa ho tlosa chromium, 'me theko ea eona e batla e phahametse ferrous sulfate,' me nako ea karabelo ea kalafo e batla e le telele, 'me boleng ba pH bo hloka ho lokisoa ka asiti pele ho kalafo.Leha ho le joalo, ha e bapisoa le phekolo ea ferrous sulfate, ha e le hantle ha e hlahise litšila tse ngata haholo, e leng ho fokotsa haholo litšenyehelo tsa ho hloekisa seretse, 'me seretse se hloekisitsoeng hangata se ka sebelisoa hape.