Kuphunzira pa chithandizo cha copper-arsenic waste acid madzi ndi sodium hydrosulfide m'malo mwa sodium sulfide

Introduction

Kafukufuku akusonyeza kuti chithandizo cha zinyalala za mkuwa ndi arsenic chimagwiritsa ntchito njira yomwe imaphatikizapo kutsika kwa sulfide, kutsatiridwa ndi kuwonjezera gypsum ndi electrochemical neutralization, zomwe pamapeto pake zimapangitsa kuti pakhale kutulutsidwa kokhazikika komwe kumakwaniritsa miyezo yolamulira. Mu gawo la kutsika kwa sulfide, yankho la sodium sulfide lokhala ndi kuchuluka kwa 26% limawonjezeredwa zokha ku zinyalala za mkuwa ndi arsenic pansi pa mikhalidwe inayake ya acidity, zomwe zimapangitsa kuti mapangidwe a CuS ndi As2S3 achotse ma ayoni a mkuwa ndi arsenic kuchokera mu gawo lamadzimadzi. Pakupanga kwenikweni, yankho la sodium sulfide limakhala ndi zinyalala zambiri zosasungunuka, ndipo likawonekera mumlengalenga, pang'onopang'ono limasungunuka kuti lipange thiosulfate. Kuphatikiza apo, lili ndi kutentha kwakukulu kwa crystallization, pakati pa zovuta zina. Chifukwa chake, kupeza wothandizira watsopano wa sulfide wolowa m'malo mwa sodium sulfide kungakhale kofunikira kwambiri.

Solid Sodium Hydrosulfide

Mfundo Yoyendetsera Ntchito

Pokhala ndi njira yochepetsera kuchuluka kwa H2S yomwe ilipo, njira yochizira zinyalala za mkuwa ndi arsenic pogwiritsa ntchito Sodium hydrosulfide imachitika kutengera zida zomwe zilipo komanso momwe zinyalala za sulfuric acid ndi madzi otayira zimayendera. Njirayi imagwiritsa ntchito njira yosakanikirana ya sodium hydrosulfide ndi sodium sulfide pochizira.

Njira ikuyenda

Chithunzi 1 chikuwonetsa njira yoyendetsera pochiza zinyalala zamkuwa ndi arsenic pogwiritsa ntchito sodium hydrosulfide. The zinyalala asidi njira, pambuyo kuchotsa SO2 mu chovula nsanja, amalowa sodium hydrosulfide reaction thanki kuchokera pamwamba. A wosakaniza njira ya sodium hydrosulfide ndi sodium sulfide anawonjezera kuchokera pansi anachita thanki. Pansi pa acidic mikhalidwe, mpweya wa H2S umapangidwa ndipo pang'onopang'ono umakwera, umachita ndi mkuwa ndi arsenic kuchokera pamwamba mpaka kupanga CuS ndi As2S3 precipitates. Kenako madziwa amasefukira mu copper thickener kuti matope agwe. The supernatant imatumizidwa ku njira yochizira gypsum, pomwe matope apansi amathiridwa madzi mu makina osindikizira asanatumizidwe kuti akapitirize kukonza. H2S yaying'ono yosasunthika imakokedwa ndi chitoliro choyipa kupita ku nsanja ya detoxification, komwe imatengedwa ndi njira yosakanikirana yozungulira ya sodium hydrosulfide ndi sodium sulfide, kuonetsetsa kuti ikukwaniritsa miyezo yotulutsa.

Njira Yoyesera

Kupanga kosalekeza kumatengedwa, ndi njira zina ndi magawo owongolera osasinthika. Sodium hydrosulfide imachita mwachangu kuposa sodium sulfide; ngati ndende ndi yokwera kwambiri, kuchuluka kwa hydrogen sulfide (H2S) kumapangidwa mofulumira pansi pa mikhalidwe ya acidic. Kupatulapo kuchitapo kanthu ndi ena amkuwa ndi arsenic mu zinyalala asidi, ndi mopitirira muyeso wa hydrogen sulfide adzathawa madzi pamwamba chifukwa cha mukubwadamuka ya paddle yosonkhezera ndi kukokedwa ndi zoipa kuthamanga kwa detoxification nsanja. Njira yomwe ilipo imagwiritsa ntchito sodium sulfide kuti itenge kuchuluka kwa hydrogen sulfide yomwe imapangidwa panthawi ya sulfide (Na2S + H2S = 2NaHS). Pambuyo poyesa kugwiritsa ntchito sodium hydrosulfide, thanki yosungiramo sodium sulfide imakhala ndi sodium hydrosulfide, yomwe imachepetsa mphamvu yake yoyamwa hydrogen sulfide wowonjezera. Pofuna kupewa mayamwidwe osakwanira wa hydrogen sulfide, zomwe zingayambitse mpweya wosagwirizana ndi nsanja ya detoxification, madzi (condensate kuchokera ku nthunzi yotentha ya tanki yosungiramo sulfide) amawonjezedwa ku tanki yosungiramo sulfide panthawi yoyeserera kuti apititse patsogolo kusakanikirana kwa njira yosakanikirana ya sodium sulfide ndi sodium hydrosulfide pafupifupi 15%.

Kutsiliza

1. Mukatha kugwiritsa ntchito njira yosakanikirana ya sodium hydrosulfide ndi sodium sulfide, mtengo wa reagent wochizira mita imodzi ya zinyalala utsikira ku 52.5% ya sodium sulfide yoyera, zomwe zimapangitsa kuti pakhale phindu lalikulu pazachuma.

2. Kugwiritsiridwa ntchito kwa njira yosakanikirana ya sodium hydrosulfide ndi sodium sulfide sikunakhudze zizindikiro za kutulutsa kwa msonkhano; miyezo yotulutsa madzi onyansa imakhalabe yokhazikika komanso yogwirizana.

3. Chifukwa cha kusakanikirana kwa sodium sulfide ndi sodium hydrosulfide, komanso ndi njira yomwe ilipo yosasinthika yosasinthika, sipanakhalepo zochitika zosagwirizana ndi mpweya wochokera ku nsanja ya detoxification.