Maganin sharar gida da ke ɗauke da chromium a cikin electroplating

Kwatanta tasirin magani na ferrous sulfate da sodium bisulfite

Tsarin samar da electroplating yana buƙatar a yi amfani da galvanized, kuma a cikin tsarin tsarkakewa na galvanized, ainihin masana'antar electroplating za ta yi amfani da chromate, don haka ruwan sharar da electroplating zai samar da adadi mai yawa na ruwan sharar da ke ɗauke da chromium saboda plating na chromium. Chromium a cikin ruwan sharar da ke ɗauke da chromium ya ƙunshi hexavalent chromium, wanda yake da guba kuma yana da wahalar cirewa. Yawanci ana canza hexavalent chromium zuwa trivalent chromium kuma a cire shi. Don cire electroplating mai ɗauke da chromium, ana amfani da coagulation na sinadarai da hazo don cire shi. Ana amfani da su galibi ta hanyar ferrous sulfate da lime reduction precision method da sodium bisulfite da alkali reduction precision method.

1. Hanyar rage hazo ta ferrous sulfate da lemun tsami

Ferrous sulfate wani sinadari ne mai ƙarfi da ke hana acid coagulant mai ƙarfi wanda ke rage iskar oxygen. Ana iya rage ferrous sulfate kai tsaye ta amfani da hexavalent chromium bayan hydrolysis a cikin ruwan sharar gida, yana mayar da shi wani ɓangare na trivalent chromium coagulation da hazo, sannan a ƙara lemun tsami don daidaita ƙimar pH zuwa kimanin 8-9, don haka zai iya taimakawa wajen samar da hazo na chromium hydroxide, tasirin cire chromate zai iya kaiwa kusan kashi 94%.

Rage yawan ruwan da ke cikin ferrous sulfate da lemun tsami yana da tasiri mai kyau ga cire chromium da ƙarancin farashi. Abu na biyu, babu buƙatar daidaita ƙimar pH kafin ƙara ferrous sulfate, kuma kawai ana buƙatar ƙara lemun tsami don daidaita ƙimar pH. Duk da haka, saboda yawan adadin ferrous sulfate da aka ɗauka, ya haifar da ƙaruwa mai yawa a cikin laka ta ƙarfe, wanda ke ƙara farashin maganin laka.

2,. hanyar rage ruwan sama ta sodium bisulfite da alkali

Ana daidaita sinadarin sodium bisulfite da kuma sinadarin alkaline rage yawan ruwan shara zuwa ≤2.0. Sannan ana ƙara sinadarin sodium bisulfite don rage yawan chromium zuwa trivalent chromium, sannan ruwan shara ya shiga cikin babban tafkin bayan an kammala ragewar, sannan a tura ruwan shara zuwa wurin da ake sarrafawa don daidaitawa, sannan a daidaita darajar pH zuwa kimanin 10 ta hanyar ƙara ƙwayoyin alkali, sannan a fitar da ruwan shara zuwa tankin sedimentation don ya haifar da chromate, kuma ƙimar cirewa zai iya kaiwa kusan kashi 95%.

Hanyar sodium bisulfite da rage yawan ruwan sama na chromate yana da kyau don cire chromium, kuma farashinsa ya fi na ferrous sulfate yawa, kuma lokacin amsawar magani ya fi tsayi, kuma ana buƙatar daidaita ƙimar pH da acid kafin a yi magani. Duk da haka, idan aka kwatanta da maganin ferrous sulfate, ba ya samar da laka da yawa, wanda ke rage farashin maganin laka sosai, kuma ana iya sake amfani da laka da aka yi wa magani.