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[{"key": "dc.contributor.advisor", "value": "V\u00e4is\u00e4nen , Ari", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Tiihonen , Antti", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Oikarinen, Krista", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-04-11T06:00:57Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-04-11T06:00:57Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2022", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/80543", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4m\u00e4n pro gradu -tutkielman kirjallisessa osassa tutustutaan yhteiskunnalle t\u00e4rke\u00e4\u00e4n metalliin kultaan sek\u00e4 sen k\u00e4ytt\u00f6kohteisiin. Kulta toimii merkitt\u00e4v\u00e4n\u00e4 raaka-aineena useilla suurilla teollisuuden aloilla, kuten elektroniikka- ja koruteollisuudessa, mik\u00e4 tekee my\u00f6s sen tarpeesta suuren. Nykyp\u00e4iv\u00e4n kasvava raaka-aineiden tarve on johtanut monien raaka-aineiden kriittisyyteen. Kriittisten raaka-aineiden saatavuudessa n\u00e4hd\u00e4\u00e4n olevan ongelmia tulevaisuudessa, jos materiaalien kulutusta jatketaan samalla tavalla. Raaka-aineiden kriittisyys on her\u00e4tt\u00e4nyt kiinnostuksen merkitt\u00e4vien raaka-aineiden, kuten kullan, vaihtoehtoisiin tuotantotapoihin malmin louhinnan lis\u00e4ksi. Raaka-aineiden kriittisyyden v\u00e4hent\u00e4miseen liittyen tutkielmassa tutustutaankin kiertotalouden malliin, jonka mukaisesti sekund\u00e4\u00e4ril\u00e4hteist\u00e4, kuten elektroniikkaj\u00e4tteest\u00e4, voidaan kierr\u00e4tt\u00e4\u00e4 hy\u00f6dyllisi\u00e4 metalleja sen sijaan, ett\u00e4 ne menisiv\u00e4t j\u00e4tteiksi. N\u00e4in my\u00f6s v\u00e4hennet\u00e4\u00e4n raaka-aineiden kulutusta primaaril\u00e4hteist\u00e4 sek\u00e4 pienennet\u00e4\u00e4n painetta raaka-aineiden kriittisyydest\u00e4. Elektroniikkaj\u00e4tteen kierr\u00e4tykseen ja metallien selektiiviseen talteenottoon syvennyt\u00e4\u00e4n hydrometallurgian kautta, miss\u00e4 k\u00e4yd\u00e4\u00e4n esimerkein l\u00e4pi hydrometallurgian eri vaiheet materiaalin esik\u00e4sittelyst\u00e4, eri liuotuksista aina erotus- ja talteenottotapoihin asti. \nKokeellisessa osassa keskityttiin kullan neste-nesteuuton optimointiin tutkimalla, kuinka vesifaasina toimivan kuningasveden laimentaminen sek\u00e4 orgaanisena faasina k\u00e4ytetyn dibutyylikarbitolin laimentaminen vaikuttavat neste-nesteuuton tehokkuuteen. Lis\u00e4ksi ty\u00f6ss\u00e4 tutkittiin neste-nesteuuton AO-suhteen vaikutusta uuttoon. Kullan pelkistys optimoitiin tutkimalla parametreja, kuten pelkistyksen l\u00e4mp\u00f6tilaa, sekoituksen vaikutusta sek\u00e4 pelkistimen\u00e4 toimivan askorbiinihapon pitoisuuden ja lis\u00e4ysnopeuden vaikutusta. Kullan talteenoton optimoinnilla saavutettiin neste-nesteuutossa kullalle noin 100 % saanto, kun kuningasvesipitoisuus oli 20\u201360 % ja AO-suhde 4:1\u20131:1. Kulta saatiin pelkistetty\u00e4 dibutyylikarbitolista noin 93 % saannolla, kun askorbiinihapon vahvuus oli 7 m-%, pelkistys suoritettiin huoneenl\u00e4mm\u00f6ss\u00e4 ja 100\u2013200 rpm sekoitusnopeudella. Lis\u00e4ksi kullan puhtaus oli t\u00e4ll\u00f6in 98,9 %.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2022-04-11T06:00:57Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-04-11T06:00:57Z (GMT). No. of bitstreams: 0\n Previous issue date: 2022", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "76", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "neste-nesteuutto", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "elektroniikkaj\u00e4te", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Kullan talteenoton optimointi elektroniikkaj\u00e4tteest\u00e4 neste-nesteuutolla", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202204112221", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Kemian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Chemistry", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Analyyttinen kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Analytical Chemistry", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "40311", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "talteenotto", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "metallit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kierr\u00e4tys", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kulta", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "raaka-aineet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "uutto", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "erotusmenetelm\u00e4t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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