1. Cov txheej txheem ntub dej
Cov txheej txheem ntub dej yog txoj hauv kev tseem ceeb rau kev tsim cov zinc sulfate. Cov txheej txheem muaj xws li zinc ore roasting, leaching, purification, neutralization, crystallization, centrifugation, thiab ziab. Cov kauj ruam tshwj xeeb yog raws li nram no:
(1) Zinc Ore Roasting: Zinc ore yog tov nrog cov hmoov hmoov thiab ci rau hauv ib lub qhov cub tig los tsim zinc calcinate.
(2) Leaching: Zinc calcinate yog tov nrog dej thiab sulfuric acid thiab leached los tsim ib tug tov ntawm zinc sulfate thiab ferric sulfate.
(3) Purification: Hlau filings lossis pyrite yog ntxiv rau cov tshuaj sib xyaw ua kom txo cov neeg ua haujlwm kom txo tau cov hlau ions mus rau ferric hydroxide precipitate, uas tom qab ntawd tshem tawm los ntawm kev pom.
(4) Neutralization: Cov kua txiv qaub los yog sodium hydroxide yog ntxiv rau cov tshuaj purified los kho cov pH mus rau 4.0-4.5, ua rau cov zinc ions nyob rau hauv cov tshuaj kom precipitate li zinc sulfate.
(5) Crystallization: Lub precipitated zinc sulfate crystals yog centrifuged kom tau txais zinc sulfate crystals.
(6) Kev ziab: Cov zinc sulfate crystals tau qhuav kom tau cov khoom tiav zinc sulfate.
Cov txheej txheem ntub dej yog qhov paub tab, yooj yim rau kev khiav lag luam, thiab muaj cov nqi tsim khoom tsawg, tab sis nws tsim cov khoom pov tseg ntau uas yuav tsum tau muab pov tseg kom zoo.
2. Pyrometallurgical ntau lawm
Lub pyrometallurgical zus tau tej cov zinc sulfate mas siv zinc slag los yog kub -dip galvanized slag li raw cov ntaub ntawv, thiab ua zinc sulfate los ntawm acid leaching, purification, thiab crystallization cov kauj ruam. Cov kauj ruam tshwj xeeb yog raws li nram no:
(1) Acid Leaching: Cov zinc slag los yog kub-dip galvanized slag yog tov nrog dilute sulfuric acid thiab ces acid leached los tsim ib tug tov ntawm zinc sulfate thiab ferric sulfate.
(2) Purification: Ib qho oxidant (xws li hydrogen peroxide) ntxiv rau cov tshuaj tov kom oxidize cov hlau ions rau ferric hydroxide precipitate, uas yog tom qab ntawd tshem tawm los ntawm kev pom.
(3) Crystallization: Cov tshuaj purified yog evaporated thiab concentrated rau precipitate zinc sulfate crystals.
(4) Centrifugation thiab ziab: Lub precipitated zinc sulfate crystals yog centrifuged thiab qhuav kom tau cov khoom tiav zinc sulfate.
Cov txheej txheem tsim cov pyrometallurgical yog qhov yooj yim, tab sis cov khoom siv raw yog txwv, ua rau cov nqi ntau lawm.
