Maganin ruwan datti mai ɗauke da chromium a cikin electroplating

Kwatanta tasirin jiyya na ferrous sulfate da sodium bisulfite

Tsarin samar da wutar lantarki yana buƙatar a sanya shi cikin galvanized, kuma yayin aiwatar da tsarkakewar galvanized, ainihin masana'antar lantarki za ta yi amfani da chromate, don haka ruwan sharar lantarki zai samar da ruwa mai yawa mai ɗauke da chromium saboda plating na chromium.Chromium a cikin ruwan datti mai dauke da chromium ya ƙunshi chromium hexavalent, wanda yake da guba kuma yana da wahalar cirewa.Hexavalent chromium yawanci ana juyawa zuwa chromium trivalent kuma an cire shi.Don cire ruwan sharar lantarki mai ɗauke da chrome, ana amfani da coagulation na sinadarai da hazo don cire shi.Mafi yawan amfani da su ne ferrous sulfate da lemun tsami hanyar rage hazo da sodium bisulfite da alkali rage hazo hanya.

1. ferrous sulfate da lemun tsami rage hazo hanya

Ferrous sulfate shine mai ƙarfi acid coagulant tare da ƙaƙƙarfan abubuwan rage iskar shaka.Ferrous sulfate za a iya kai tsaye rage tare da hexavalent chromium bayan hydrolysis a cikin sharar gida, maida shi a cikin wani ɓangare na trivalent chromium coagulation da hazo, sa'an nan kuma ƙara lemun tsami don daidaita pH darajar zuwa game da 8 ~ 9, sabõda haka, zai iya taimaka coagulation dauki haifar da hazo chromium hydroxide, sakamakon cirewar chromate zai iya kaiwa kusan 94%.

Ferrous sulfate da lemun tsami coagulant rage hazo chromate yana da kyakkyawan tasiri akan cire chromium da ƙarancin farashi.Abu na biyu, babu buƙatar daidaita ƙimar pH kafin ƙari na ferrous sulfate, kuma kawai buƙatar ƙara lemun tsami don daidaita ƙimar pH.Duk da haka, saboda yawan adadin ferrous sulfate dosing kuma ya haifar da karuwa mai yawa a cikin laka na ƙarfe, yana ƙara farashin maganin sludge.

2,.sodium bisulfite da alkali rage hazo Hanyar

Sodium bisulfite da alkali rage hazo chromate, ana daidaita pH na ruwan sharar gida zuwa ≤2.0.Sannan ana kara sodium bisulfite don rage chromate zuwa trivalent chromium, kuma ruwan sharar gida yana shiga cikin cikakken tafkin bayan an gama ragewa, ana zubar da ruwan sharar a cikin tafkin don daidaitawa, ana daidaita darajar pH zuwa kusan 10 ta hanyar ƙara alkali. nodes, sa'an nan kuma an fitar da ruwan sharar gida zuwa tanki mai lalata don haɓaka chromate, kuma adadin cirewa zai iya kaiwa kusan 95%.

Hanyar sodium bisulfite da alkali rage hazo chromate yana da kyau don cire chromium, kuma farashinsa ya fi girma fiye da ferrous sulfate, kuma lokacin amsawar jiyya ya fi tsayi, kuma ƙimar pH yana buƙatar daidaitawa tare da acid kafin magani.Koyaya, idan aka kwatanta da jiyya na sulfate na ƙarfe, a zahiri baya samar da sludge mai yawa, yana rage farashin jiyya na sludge, kuma ana iya sake amfani da sludge ɗin da aka bi da shi galibi.