Kurapa mvura yakasviba ine chromium mu electroplating

Kuenzanisa kwemigumisiro yekurapa kweferrous sulfate nesodium bisulfite

Maitiro ekugadzira electroplating anofanira kunge akagadzika, uye mukuita kwekuchenesa galvanized, fekitari ye electroplating inoshandisa chromate, saka mvura yakasviba ye electroplating ichagadzira huwandu hwakawanda hwemvura yakasviba ine chromium nekuda kwe chromium plating. Chromium iri mumvura yakasviba ine chromium ine hexavalent chromium, ine chepfu uye yakaoma kubvisa. Hexavalent chromium inowanzo shandurwa kuita trivalent chromium yobviswa. Pakubvisa mvura yakasviba ine chrome-containing electroplating, chemical coagulation uye precipitation zvinowanzo shandiswa kuibvisa. Inowanzoshandiswa inzira ye ferrous sulfate uye lime reduction precipitation uye sodium bisulfite uye alkali reduction precipitation method.

1. Nzira yekuderedza kunaya kwemvura neferrous sulfate ne lime

Ferrous sulfate isimbi inosunga acid ine simba ine simba rekuderedza oxidation. Ferrous sulfate inogona kuderedzwa zvakananga ne hexavalent chromium mushure mekunyungudika mumvura yakasviba, ichiishandura kuita chikamu che trivalent chromium coagulation uye precipitation, uye wobva wawedzera lime kugadzirisa pH kusvika pa8 ~ 9, kuitira kuti ikwanise kubatsira coagulation reaction kugadzira chromium hydroxide precipitation, mhedzisiro yekubvisa chromate inogona kusvika pa94%.

Ferrous sulfate pamwe ne lime coagulant reduction chromate precipitation zvine mhedzisiro yakanaka pakubvisa chromium uye mutengo wakaderera. Chechipiri, hapana chikonzero chekugadzirisa pH value usati wawedzera ferrous sulfate, uye unongoda kuwedzera lime kuti ugadzirise pH value. Zvisinei, nekuda kwehuwandu hwakawanda hwe ferrous sulfate dosing yakakonzerawo kuwedzera kukuru kwesimbi mumatope, zvichiwedzera mutengo wekurapa sludge.

2,. nzira yekuderedza mvura yesodium bisulfite uye alkali

Sodium bisulfite uye alkali reduction precipitation chromate, pH yemvura yakasviba inogadziriswa kusvika ≤2.0. Zvadaro sodium bisulfite inowedzerwa kuderedza chromate kuita trivalent chromium, uye mvura yakasviba inopinda mudziva rakazara mushure mekunge kuderedzwa kwapera, mvura yakasviba inopombwa kuenda kudziva rinotonga kuti igadziriswe, uye pH value inogadziriswa kusvika pa10 nekuwedzera alkali nodes, uye mvura yakasviba inoburitswa mutangi re sedimentation kuti igadzire chromate, uye chiyero chekubvisa chinogona kusvika pa95%.

Nzira yekushandisa sodium bisulfite nealkali reduction precipitation chromate yakanaka pakubvisa chromium, uye mutengo wayo wakakwira kupfuura ferrous sulfate, uye nguva yekurapa yakareba, uye pH inofanira kugadziriswa neacid isati yashandiswa. Zvisinei, kana ichienzaniswa nekushandisa ferrous sulfate, haibudisi tsvina yakawandisa, zvichideredza zvakanyanya mutengo wekushandisa sludge, uye sludge yakarapwa inogona kushandiswazve.