Maitiro eAcidification Kudzoreredza kweSodium Cyanide uye Heavy Metals kubva kuWastewater

ziviso

Mvura yakasviba ine Cyanide inogadzirwa kubva mumabasa akasiyana-siyana emaindasitiri akadai sekuchera goridhe, electroplating, uye kugadzirwa kwemakemikari. Nekuda kwehupfu hwakawanda hwecyanide , kuburitswa kwemvura yakasviba iyi zvisina kunaka kunogona kukonzera kusvibiswa kwakanyanya kwenharaunda uye kukuvadza hutano hwevanhu. Nokudaro, kurapwa nekudzoreredzwa kwezviwanikwa zvemvura yakasviba ine cyanide kwave nyaya huru. Pakati penzira dzekurapa, Acidification Recovery yeSodium Cyanide nesimbi dzinorema inzira inoshandiswa zvakanyanya uye inoshanda, iyo isingangoderedzi njodzi yezvakatipoteredza chete asiwo inoita kuti zviwanikwa zvinokosha zvidzokororwe.

Nheyo yeAcidification Recovery

Shanduko yeCyanide kuti Hydrogen Cyanide (HCN)

Mukuita acidification, maasidhi akasimba senge sulfuric acid anowedzerwa kumvura ine tsvina ine cyanide. Pasi pemamiriro eacidic, ayoni emahara ecyanide mumvura yetsvina anoshanduka kuita hydrogen cyanide (HCN). Hydrogen cyanide chinhu chinoputika. Kana iyo pH yemvura yakasviba ichigadziriswa kune yakaderera kukosha, kazhinji pasi pe 2. mhinduro yacho inogona kuenderera mberi, zvichiita kuti kutendeuka kweiyo cyanide kuve HCN gasi.

Kudzorerwa kweSodium Cyanide

Gasi reHCN rinogadzirwa rinozopinzwa munhare yekunyudza alkali. Mukati menhare, rinoita mubatanidzwa nesodium hydroxide (NaOH) solution. Sezvo mubatanidzwa uchienderera mberi, sodium cyanide (NaCN) inoumbwa uye inoungana mumushonga wekunyudza. Kana huwandu hweNaCN mumushonga hwasvika pa10% - 12%, hunogona kudzokororwazve uye kushandiswazve mumaindasitiri akakodzera, akadai sekubvisa goridhe mukuchera goridhe.

Kuburitswa uye Kunaya kweMasimbi Anorema

Kunze kweiyo cyanide yemahara, mvura yetsvina inowanzova nemidziyo yesimbi inorema uye cyanide, senge yemhangura uye zinc. Pasi pemamiriro e acidic, aya macomplexes anoputsika. Kana iyo heavy metal ions yaburitswa, inogona kugadzira munyu usinganyunguriki uye kudonha pasi pemamiriro chaiwo. Semuenzaniso, kugadzirisa pH kukosha kana kuwedzera mamwe maajenti anonaya anogona kukonzera maion emhangura kuti aumbe mvura.

Matanho Matanho

Danho 1: Wastewater Pretreatment

Iyo alkaline cyanide - ine yakakwira - yetsvina yetsvina inotanga kupfuura nepamhepo yekupisa inopisa kudzora tembiricha yayo. Kazhinji, tembiricha inochengetwa mukati memhando ye20 - 25 ° C. Iyi tembiricha yekudzora inobatsira kukwidziridza iyo inotevera reaction rate uye inovimbisa kugadzikana kwemaitiro. Kuwanda kwecyanide mumvura yetsvina yepamusoro-soro inowanzobva pa5000 - 5500 ppm, uye kukosha kwepH kuri pakati pe10.5 - 12.5.

Danho 2: Acidification

Mvura yetsvina isati yacheneswa inoiswa muacidification spray tower pane imwe mwero wekuyerera, semuenzaniso, 2 m³/h. Zvadaro, concentrated sulfuric acid inowedzerwa. Nhamba ye sulfuric acid yakawedzerwa inogadziriswa maererano nemaitiro emvura yakasvibiswa, kazhinji 25 - 30 kg / m³, kuderedza pH kukosha kwemvura yakasvibiswa kusvika pasi pe 2. Kupisa kunobudiswa panguva yekuwedzera kwe sulfuric acid kunogona kukurumidza kuita, zvichiita kuti zvive nyore kune mahara cyanide ions mumvura yakasviba kuti ishanduke kuva HCN inoputika.

Nhanho 3: HCN Chizvarwa uye Kuparadzaniswa

Munzvimbo ine acidic yakasimba yeiyo acidification spray tower, shanduko yecyanide kuita HCN inosimudzirwa. Iyo yakaumbwa HCN gasi inobva yadhonzwa nevacuum centrifugal fan uye inopinda muchikamu chinotevera - iyo alkali absorption tower. Panguva imwecheteyo, sezvo pH yakakosha inodzikira, mamwe anorema esimbi maion mumvura yetsvina anotanga kushanduka. Semuenzaniso, kuwanda kwemaion emhangura mumvura yetsvina kunogona kudonha, uye mamwe masimbi anorema anotanga kuumba mvura.

Nhanho 4: Kutora uye Kudzoreredza Sodium Cyanide

Gasi reHCN rinopinda mugomo rekunyudza alkali uye rinonyudzwa ne20% - 30% NaOH solution. Mvura yekunyudza alkali iri mugomo inodzokororwa, uye panguva yekudzokororwa, feni inoshandiswa kuona kuti gasi reHCN rinonyudzwa kakawanda. Sezvo nzira yekunyudza ichiramba ichienderera mberi, huwandu hweNaCN mumvura yekunyudza hunowedzera zvishoma nezvishoma. Kana huwandu hweNaCN hwasvika 10% - 12%, hunogona kudzoserwa mugwara rekunyudza kuti hushandiswezve, nokudaro zvichiita kuti Sodium cyanide idzoke.

Nhanho 5: Kunaya Kwesimbi Inorema uye Kupatsanura

Kumvura yetsvina mushure mekuburitswa kweHCN, sezvo mamwe masimbi anorema - cyanide complexes akaputswa pasi pemamiriro ane acidic, kumwe kurapwa kunogona kuitwa kudonhedza simbi inorema. Semuyenzaniso, kugadzirisa pH kukosha kwemvura yetsvina kune alkaline range inogona kuumba heavy metal hydroxides inonaya. Zvadaro, nzira dzakasimba - dzekuparadzanisa mvura dzakadai sefiltration kana sedimentation dzinogona kushandiswa kupatsanura simbi inorema kubva mumvura inoraswa, kuwana kubviswa uye kudzoreredzwa kwesimbi inorema.

Zvakanakira zveAcidification Recovery Method

Resource Recycling

Iyo acidification yekudzoreredza nzira inogona kunyatso kudzoreredza sodium cyanide kubva kucyanide - ine tsvina yemvura, iyo inogona kushandiswazve mune yakakodzera maindasitiri maitiro, kuderedza kushandiswa kwesodium cyanide nyowani uye kudzikisa mutengo wekugadzira. Panguva imwecheteyo, simbi inorema inogona zvakare kudzoserwa, ichishandura marara kuita zviwanikwa zvakakosha.

Mutengo - Kubudirira

Kuenzaniswa nedzimwe nzira dzekurapa dzinongotarisa pakuparadza cyanide, iyo acidification yekudzoreredza nzira haingobata mvura yetsvina chete asiwo inodzoreredza zvinhu zvakakosha. Kunyangwe zvichida kudyiwa kweasidhi nealkali, kukosha kweiyo yakadzoserwa sodium cyanide uye zvinorema simbi zvinogona kudzikisira chikamu chemutengo wekurapa, zvichiita kuti kurapwa kwese kuwedzere kudhura - kunoshanda mukufamba kwenguva.

Environmental Friendliness

Nekudzoreredza sodium cyanide uye heavy metals, huwandu hwezvinosvibisa mumvura yetsvina hunodzikiswa zvakanyanya. Mvura yetsvina yakacheneswa ine yakaderera ye cyanide uye inorema simbi, izvo zvinonyanya kubatsira kunotevera kubuda kana kumwe kurapwa, kuderedza kukanganisa kwakashata pane zvakatipoteredza.

Kushandiswa muAcidification Recovery Process

Kushandiswa kweiyo acidification yekudzoreredza nzira yecyanide - ine tsvina yemvura inonyanya kusanganisira sulfuric acid, caustic soda (NaOH), lime, uye magetsi. Munguva yechando, zvinodikanwa preheat mvura yakasviba, saka steam inopedzwa zvakare.

1.Acid Kushandiswa

• Kushandurwa kweCyanide kuita HCN : Huwandu hwesulfuric acid hunodiwa kushandura cyanide mumvura yakasviba kuita HCN hunoenderana nehuwandu hwecyanide mumvura yakasviba. Semuenzaniso, kurapa 1 m³ yemvura yakasviba nehuwandu hwecyanide hwe5000 ppm, huwandu hwakati hwesulfuric acid hunodiwa pakushandura uku.

• Kuisa Asidhi muMvura Yakasviba : Kunze kweasidhi yekushandura cyanide, imwe asidhi inoshandiswa kugadzirisa mvura yakasviba kusvika padanho rakakodzera reasidhi. Huwandu hunodiwa kuderedza pH kusvika pasi pe2 chinhu chakakosha.

• Kusangana neAlkali muWastewater : Panogona kunge paine zvimwe zvinhu zvine alkaline mumvura yakasviba zvinosangana nesulfuric acid, asi kazhinji, kushandiswa uku kushoma kana tichienzanisa nehuwandu hunoshandiswa pakushandura cyanide uye kuisa acid muchinhu.

• Kusangana neCarbonate muMarara : Kana zvinhu zvisina kugadzirwa zvine cyanide zvine huwandu hwakawanda hweCarbon , senge mune mamwe marara ecyanide, carbonate ichaita zvakafanana neacid kuumba carbon dioxide. Muzviitiko zvakadaro, kushandiswa kwesulfuric acid kuchawedzera zvakanyanya, uye zvinhu izvi zvingasave zvakanaka pakurapa nenzira yeacid-recovery.

2. Kushandiswa kweAlkali : Caustic soda (NaOH) inoshandiswa muchikamu chekunyudza alkali kuti inyudze HCN uye igadzire NaCN. Huwandu hweNaOH hunodyiwa hunoenderana nehuwandu hweHCN hunogadzirwa uye kushanda zvakanaka kwemunyu.

3. Kushandiswa kweLime : Mune zvimwe zviitiko, lime inogona kushandiswa pakurapa mvura yakasviba, sekugadzirisa pH yemvura inonaya nesimbi inorema. Huwandu hwelime hunodiwa hunoenderana nerudzi uye huwandu hwesimbi dzinorema mumvura yakasviba uye huwandu hwe pH hunodiwa.

4. Kushandiswa kweMagetsi neMhepo : Magetsi anoshandiswa nemidziyo yakaita semapombi, mafeni, uye mafeni e centrifugal. Munguva yechando, kana mvura yakasviba ichidziiswa, mhepo inoshandiswa kuti ikwidze tembiricha kusvika padanho rakakodzera rekuita.

mhedziso

Iyo acidification yekudzoreredza nzira yecyanide - ine tsvina yemvura yekudzoreredza sodium cyanide uye heavy metals inyanzvi uye inoshanda yekurapa tekinoroji. Nekutevera matanho chaiwo ekuita, haingobvisi cyanide ine muchetura uye simbi inorema kubva mumvura ine tsvina asi zvakare kudzoreredza zviwanikwa zvakakosha. Kunyangwe paine zvimwe zvinhu uye mashandisirwo esimba mukuita, tichifunga nezvezvakatipoteredza uye zvehupfumi mabhenefiti, ine yakakura tarisiro yekushandisa mukurapwa kwecyanide - ine tsvina yemvura. Nekudaro, mukushanda chaiko, matanho akasimba ekuchengetedza anofanirwa kutorwa nekuda kwehupfu hweHCN gasi. Panguva imwecheteyo, kuenderera mberi kwekugadzirisa kwemaitiro maitiro kunodiwa kuti uvandudze kudzoreredza kunyatsoita uye kuderedza mutengo.