Ukunyangwa kwamanzi amdaka anechromium kwi-electroplating

Ukuthelekiswa kwemiphumo yonyango ye-ferrous sulfate kunye ne-sodium bisulfite

Inkqubo yokuvelisa i-electroplating kufuneka ifakwe i-galvanized, kwaye kwinkqubo yokuhlanjululwa kwegalvanized, ngokusisiseko iplanti ye-electroplating iya kusebenzisa i-chromate, ngoko ke amanzi amdaka e-electroplating aya kuvelisa inani elikhulu lamanzi amdaka aqulethe i-chromium ngenxa ye-chromium plating.Ichromium kumanzi amdaka aqulathe ichromium inehexavalent chromium, enetyhefu kwaye kunzima ukuyisusa.Ihexavalent chromium idla ngokuguqulelwa kwi-trivalent chromium kwaye isuswe.Ukukhutshwa kwamanzi amdaka ane-chrome ane-electroplating, i-chemical coagulation kunye nemvula isoloko isetyenziselwa ukuyisusa.Ngokuqhelekileyo kusetyenziswa indlela ye-ferrous sulfate kunye nekalika yokunciphisa imvula kunye ne-sodium bisulfite kunye nendlela yokunciphisa i-alkali.

1. i-ferrous sulfate kunye ne-lime yokunciphisa i-precipitation method

I-Ferrous sulfate yi-asidi eyomeleleyo yokujiya kunye neempawu ezinamandla zokunciphisa i-oxidation.I-Ferrous sulfate inokwehliswa ngokuthe ngqo nge-chromium enehexavalent emva kwe-hydrolysis kumanzi amdaka, iguqulwe ibe yinxalenye ye-trivalent ye-chromium coagulation kunye nemvula, kwaye yongeza ikalika ukulungisa ixabiso le-pH malunga ne-8 ~ 9, ukuze incede ukusabela kwe-coagulation Ukuvelisa i-chromium hydroxide precipitation, umphumo wokususwa kwechromate unokufikelela malunga ne-94%.

I-Ferrous sulfate kunye ne-lime coagulant yokunciphisa imvula yechromate inefuthe elihle ekususweni kwechromium kunye nexabiso eliphantsi.Okwesibini, akukho mfuneko yokulungelelanisa ixabiso le-pH phambi kokufakwa kwe-ferrous sulfate, kwaye kufuneka kuphela ukongeza ikalika ukulungisa ixabiso le-pH.Nangona kunjalo, ngenxa yesixa esikhulu se-ferrous sulfate dosing kwakhona kubangele ukwanda okukhulu kudaka lwentsimbi, ukwandisa iindleko zonyango lwe-sludge.

I-2,.i-sodium bisulfite kunye ne-alkali yokunciphisa indlela yemvula

I-sodium bisulfite kunye ne-alkali yokunciphisa i-chromate yemvula, i-pH yamanzi amdaka ilungelelaniswe ku-≤2.0.Emva koko i-sodium bisulfite yongezwa ukunciphisa i-chromate kwi-chromium e-trivalent, kwaye amanzi amdaka angena echibini elibanzi emva kokugqitywa kokunciphisa, amanzi angcolileyo ampontshelwa kwi-pool yokulawula ukulungiswa, kwaye ixabiso le-pH lihlengahlengiswa malunga ne-10 ngokudibanisa i-alkali. iindawo zokuhlala, kwaye emva koko amanzi amdaka akhutshelwa kwitanki yentlenga ukuze aqhube i-chromate, kwaye izinga lokususa linokufikelela malunga nama-95%.

Indlela ye-sodium bisulfite kunye ne-alkali yokunciphisa i-chromate yemvula ilungile ekususweni kwe-chromium, kwaye ixabiso layo liphezulu kakhulu kune-ferrous sulfate, kwaye ixesha lokuphendula unyango lide kakhulu, kwaye ixabiso le-pH lifuna ukulungiswa kunye ne-asidi ngaphambi konyango.Nangona kunjalo, xa kuthelekiswa nonyango lwe-ferrous sulfate, ngokusisiseko aluvelisi udaka oluninzi, lunciphisa kakhulu iindleko zokunyanga udaka, kwaye udaka olucociweyo lunokuphinda lusetyenziswe.