Kurapa kwemvura yakasviba ine chromium mu electroplating

Kuenzanisa kwekurapa mhedzisiro yeferrous sulfate uye sodium bisulfite

Maitiro ekugadzirwa kwe electroplating inoda kuvezwa, uye mukucheneswa kwemarara, kunyanya iyo electroplating chirimwa inoshandisa chromate, saka iyo electroplating tsvina yemvura inoburitsa huwandu hukuru hwemvura ine tsvina ine chromium nekuda kwechromium plating.Chromium iri mumvura yetsvina ine chromium ine hexavalent chromium, ine muchetura uye inonetsa kubvisa.Hexavalent chromium inowanzoshandurwa kuita trivalent chromium yobviswa.Kubvisa chrome-ine electroplating wastewater, kemikari coagulation uye kunaya kunowanzoshandiswa kuibvisa.Inonyanya kushandiswa iferrous sulfate uye lime reduction precipitation method uye sodium bisulfite uye alkali kuderedza kunaya kwemvura.

1. ferrous sulfate uye lime reduction precipitation method

Ferrous sulfate is a strong acid coagulant ine yakasimba oxidation-reducing properties.Ferrous sulfate inogona kuderedzwa zvakananga nehexavalent chromium mushure me hydrolysis mumvura ine tsvina, ichishandura kuita chikamu che trivalent chromium coagulation uye kunaya, uyezve nekuwedzera lime kuti igadzirise pH kukosha kusvika pa8 ~ 9, kuitira kuti igone kubatsira coagulation reaction gadzira chromium hydroxide precipitation, kubviswa kwechromate kunogona kusvika pa94%.

Ferrous sulfate pamwe ne lime coagulant kuderedza chromate kunaya kune mhedzisiro yakanaka pakubvisa chromium uye mutengo wakaderera.Chechipiri, hapana chikonzero chekugadzirisa pH kukosha kusati kwawedzerwa ferrous sulfate, uye inongoda kuwedzera lime kuti igadzirise pH kukosha.Nekudaro, nekuda kweiyo yakawanda ferrous sulfate dosing yakakonzerawo kuwedzera kukuru mumatope esimbi, zvichiwedzera mutengo we sludge kurapwa.

2,.sodium bisulfite uye alkali kuderedza kunaya nzira

Sodium bisulfite uye alkali reduction precipitation chromate, iyo pH yemvura yakasviba inogadziriswa kusvika ≤2.0.Zvadaro sodium bisulfite inowedzerwa kuderedza chromate kune trivalent chromium, uye mvura yemarara inopinda mudziva rakazara mushure mokunge kuderedzwa kwapera, mvura yakasvibiswa inoputirwa kune dziva rekugadzirisa kuti rigadziriswe, uye pH kukosha kunogadziriswa kusvika ku10 nekuwedzera alkali. nodes, uye ipapo mvura yakaraswa inobudiswa kune sedimentation tangi kuti iwedzere chromate, uye chiyero chekubvisa chinogona kusvika kusvika 95%.

Nzira ye sodium bisulfite uye alkali reduction precipitation chromate yakanaka pakubvisa chromium, uye mutengo wayo wakakwira zvakati wandei pane ferrous sulfate, uye nguva yekubata kurapwa yakati rebei, uye pH kukosha kunoda kugadziriswa neasidhi isati yarapwa.Nekudaro, kana zvichienzaniswa neferrous sulfate kurapwa, haiburitse tsvina yakawandisa, ichideredza zvakanyanya mutengo wekugadziriswa kwemarara, uye tsvina yakagadziriswa inogona kushandiswa zvakare.