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

Introduction

Kafukufuku akuwonetsa kuti chithandizo cha zinyalala zamkuwa ndi arsenic zimagwiritsa ntchito njira yomwe imaphatikizapo mpweya wa sulfide, wotsatiridwa ndi kuwonjezera kwa gypsum ndi electrochemical neutralization, potsirizira pake kumabweretsa kutulutsa kokhazikika komwe kumayenderana ndi malamulo. Mu sitepe ya sulfide mpweya, a sodium sulfide yankho ndi misa ndende ya 26% basi anawonjezera kuti mkuwa ndi arsenic munali zinyalala asidi pansi enieni acidity zinthu, chifukwa mu mapangidwe CuS ndi As2S3 precipitates kuchotsa mkuwa ndi ayoni arsenic ku madzi gawo. Popanga kwenikweni, njira ya sodium sulfide imakhala ndi zonyansa zambiri zosasungunuka, ndipo ikayatsidwa ndi mpweya, imatulutsa oxidize kupanga thiosulfate. Kuonjezera apo, ili ndi kutentha kwakukulu kwa crystallization, pakati pa zovuta zina. Choncho, kupeza mankhwala atsopano a sulfide m'malo mwa sodium sulfide kungakhale kofunikira kwambiri.

Solid Sodium Hydrosulfide

Mfundo Yoyendetsera Ntchito

Kukakamizidwa ndi njira yomwe ilipo yochulukirapo ya H2S, chithandizo chamkuwa ndi arsenic okhala ndi zinyalala za asidi pogwiritsa ntchito Sodium hydrosulfide imachitika motengera zida zomwe zilipo komanso njira yoyendetsera ntchito ya sulfuric acid workshop's acid acid ndi madzi oipa. Njirayi imagwiritsa ntchito njira yosakanikirana ya sodium hydrosulfide ndi sodium sulfide pochiza.

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.