Unyango lwamanzi amdaka ane-chromium kwi-electroplating

Ukuthelekiswa kweziphumo zonyango lwe-ferrous sulfate kunye ne-sodium bisulfite

Inkqubo yokuvelisa i-electroplating kufuneka i-galvanized, kwaye kwinkqubo yokucoca i-galvanized, ngokuyintloko isityalo se-electroplating siya kusebenzisa i-chromate, ngoko ke amanzi amdaka e-electroplating aya kuvelisa inani elikhulu lamanzi amdaka aqulethe i-chromium ngenxa ye-chromium plating. I-chromium emanzini amdaka aqulethe i-chromium ine-hexavalent chromium, enobuthi kwaye kunzima ukuyisusa. I-hexavalent chromium idla ngokuguqulwa ibe yi-trivalent chromium ize isuswe. Ukususa amanzi amdaka aqulethe i-chrome, i-chemical coagulation kunye ne-precipitation zihlala zisetyenziselwa ukuyisusa. Ezisetyenziswa kakhulu yi-ferrous sulfate kunye ne-lime reduction precipitation method kunye ne-sodium bisulfite kunye ne-alkali reduction precipitation method.

1. indlela yokunciphisa imvula ye-ferrous sulfate kunye nelayimu

I-Ferrous sulfate yi-coagulant enamandla ye-asidi eneempawu ezinamandla zokunciphisa i-oxidation. I-Ferrous sulfate ingancitshiswa ngokuthe ngqo nge-hexavalent chromium emva kwe-hydrolysis emanzini amdaka, iguqulwe ibe yinxalenye ye-trivalent chromium coagulation kunye ne-precipitation, ize yongezwe ilayimu ukulungisa ixabiso le-pH ukuya malunga ne-8 ~ 9, ukuze incede i-coagulation reaction ukuvelisa i-chromium hydroxide precipitation, isiphumo sokususwa kwe-chromate sinokufikelela malunga ne-94%.

Ukunciphisa i-chromate ye-Ferrous sulfate kunye ne-lime coagulant kunefuthe elihle ekususweni kwe-chromium kunye nexabiso eliphantsi. Okwesibini, akukho mfuneko yokulungisa ixabiso le-pH ngaphambi kokongeza i-ferrous sulfate, kwaye kufuneka kongezwe i-lime kuphela ukulungisa ixabiso le-pH. Nangona kunjalo, ngenxa yobuninzi be-ferrous sulfate dosing nayo ibangele ukwanda okukhulu kodaka lwesinyithi, okwandisa iindleko zonyango lwedaka.

2,.indlela yokunciphisa imvula ye-sodium bisulfite kunye ne-alkali

I-sodium bisulfite kunye ne-alkali reduction precipitation chromate, i-pH yamanzi amdaka ilungiswa ibe yi-≤2.0. Emva koko i-sodium bisulfite yongezwa ukunciphisa i-chromate ibe yi-trivalent chromium, kwaye amanzi amdaka angena echibini elibanzi emva kokuba ukunciphisa kugqityiwe, amanzi amdaka ampontshwa aye echibini elilawulayo ukuze alungiswe, kwaye ixabiso le-pH lilungiswa libe malunga ne-10 ngokongeza ii-alkali nodes, kwaye emva koko amanzi amdaka akhutshwa kwi-sedimentation tank ukuze akhuphe i-chromate, kwaye izinga lokususa linokufikelela malunga ne-95%.

Indlela yokusebenzisa i-sodium bisulfite kunye ne-alkali reduction precipitation chromate ilungile ekususweni kwe-chromium, kwaye ixabiso layo liphezulu kune-ferrous sulfate, kwaye ixesha lokuphendula unyango lide kakhulu, kwaye ixabiso le-pH kufuneka lilungiswe nge-asidi ngaphambi konyango. Nangona kunjalo, xa kuthelekiswa nonyango lwe-ferrous sulfate, ngokusisiseko ayivelisi i-sludge eninzi kakhulu, nto leyo enciphisa kakhulu iindleko zonyango lwe-sludge, kwaye i-sludge ephathwayo idla ngokusetyenziswa kwakhona.