Kawm txog kev kho cov tooj liab-arsenic khib nyiab dej nrog sodium hydrosulfide es tsis txhob sodium sulfide

Introduction

Kev tshawb fawb qhia tau hais tias kev kho cov tooj liab thiab arsenic-muaj cov kua qaub pov tseg siv cov txheej txheem uas muaj sulfide nag lossis daus, tom qab ntawd los ntawm gypsum ntxiv thiab electrochemical neutralization, thaum kawg ua rau cov paug ruaj khov uas ua tau raws li cov qauv kev cai. Nyob rau hauv cov kauj ruam sulfide nag lossis daus, a sodium sulfide kev daws teeb meem nrog cov concentration ntawm 26% yog cia li ntxiv rau tooj liab thiab arsenic-muaj cov khib nyiab acid nyob rau hauv cov acidity tej yam kev mob, uas ua rau cov tsim ntawm CuS thiab As2S3 precipitates kom tshem tau tooj liab thiab arsenic ions los ntawm cov kua theem. Hauv kev tsim khoom tiag tiag, cov tshuaj sodium sulfide muaj cov qib siab ntawm insoluble impurities, thiab thaum raug huab cua, nws maj mam oxidizes los tsim thiosulfate. Tsis tas li ntawd, nws muaj qhov kub siab crystallization, nrog rau lwm yam tsis zoo. Yog li, nrhiav tus neeg sawv cev tshiab sulfide los hloov sodium sulfide yuav yog qhov tseem ceeb.

Khoom Sodium Hydrosulfide

Txoj Cai Txheej Txheem

Constrained los ntawm cov txheej txheem H2S uas twb muaj lawm, kev kho cov tooj liab thiab arsenic-muaj cov kua qaub uas siv. Sodium hydrosulfide yog ua raws li cov khoom siv tam sim no thiab cov txheej txheem ntws ntawm sulfuric acid Rhiav cov kua qaub thiab cov dej khib nyiab. Txoj kev no siv cov tshuaj sib tov ntawm sodium hydrosulfide thiab sodium sulfide rau kev kho mob.

Txheej Txheem

Daim duab 1 qhia txog cov txheej txheem khiav daim duab rau kev kho cov tooj liab thiab arsenic-muaj cov kua qaub uas siv sodium hydrosulfide. Cov kua qaub pov tseg, tom qab tshem tawm ntawm SO2 nyob rau hauv lub stripping ntauwd, nkag mus rau sodium hydrosulfide cov tshuaj tiv thaiv tank los ntawm sab saum toj. Ib qho kev sib xyaw ntawm sodium hydrosulfide thiab sodium sulfide yog ntxiv los ntawm hauv qab ntawm cov tshuaj tiv thaiv tank. Nyob rau hauv acidic tej yam kev mob, H2S roj yog generated thiab maj mam nce, reacting nrog tooj liab thiab arsenic los ntawm sab saum toj mus rau CuS thiab As2S3 precipitates. Cov precipitates ces ntws mus rau hauv tooj liab thickener rau sedimentation. Lub supernatant raug xa mus rau cov txheej txheem kho gypsum, thaum cov sludge hauv qab yog dewatered hauv lub lim xovxwm ua ntej xa mus rau kev ua haujlwm ntxiv. Ib qho me me ntawm H2S uas tsis muaj kev cuam tshuam yog rub tawm los ntawm cov yeeb nkab tsis zoo rau lub detoxification ntauwd, qhov twg nws yog absorbed los ntawm circulating tov tov ntawm sodium hydrosulfide thiab sodium sulfide, kom ntseeg tau tias nws ua tau raws li cov qauv tso tawm.

Txoj kev sim

Ib hom kev tsim khoom tas mus li tau txais yuav, nrog rau lwm cov txheej txheem thiab kev tswj xyuas tsis hloov pauv. Sodium hydrosulfide reacts sai dua sodium sulfide; Yog hais tias qhov concentration yog siab heev, ib tug loj npaum li cas ntawm hydrogen sulfide (H2S) yog generated sai nyob rau hauv acidic tej yam kev mob. Sib nrug los ntawm kev cuam tshuam nrog qee cov tooj liab thiab arsenic hauv cov kua qaub pov tseg, cov hydrogen sulfide ntau dhau yuav khiav tawm ntawm cov kua dej vim muaj kev ntxhov siab ntawm cov nplawm nplawm thiab rub tawm los ntawm qhov tsis zoo rau lub detoxification ntauwd. Cov txheej txheem uas twb muaj lawm siv sodium sulfide los nqus cov hydrogen sulfide ntau dhau los ntawm cov tshuaj sulfide (Na2S + H2S = 2NaHS). Tom qab sim siv sodium hydrosulfide, lub tank sodium sulfide cia muaj qee qhov sodium hydrosulfide, uas txo nws lub peev xwm nqus tau ntau tshaj hydrogen sulfide. Txhawm rau tiv thaiv kev nqus tsis tiav ntawm hydrogen sulfide, uas tuaj yeem ua rau tsis ua raws li emissions los ntawm detoxification ntauwd, dej (condensate los ntawm lub cua sov chav ntawm sodium sulfide cia tank) yog ntxiv rau sodium sulfide cia tank thaum lub sij hawm mus sib hais kom lub concentration ntawm tov ntawm sodium sulfide thiab sodium hydrosulfide ntawm kwv yees li 15%.

xaus

1. Tom qab siv cov tshuaj sib xyaw ntawm sodium hydrosulfide thiab sodium sulfide, reagent nqi rau kev kho ib lub cubic meter ntawm cov kua qaub pov tseg raug txo rau 52.5% ntawm cov ntshiab sodium sulfide, uas ua rau muaj txiaj ntsig kev lag luam tseem ceeb.

2. Kev siv cov tshuaj sib xyaw ntawm sodium hydrosulfide thiab sodium sulfide tsis cuam tshuam rau kev tso tawm ntawm qhov kev cob qhia; cov qauv kev tso dej pov tseg nyob ruaj khov thiab ua raws.

3. Vim muaj kev sib xyaw ntawm sodium sulfide thiab sodium hydrosulfide, thiab nrog rau cov txheej txheem detoxification ntauwd uas twb muaj lawm tsis hloov, tsis muaj qhov tsis ua raws li cov emissions los ntawm detoxification ntauwd.