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Neutralizing acidic wastewater from the pickling process using slag from the steelmaking process: A pilot study in project "Neutralsyra"
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Properties and origins of two byproducts from steelmaking plants, slag and acidic wastewater, are investigated in this report. The slags' suitability as neutralizing agents of acidic wastewater from the pickling process, with regard to amount of slag required and the environmental impact of the produced byproducts is investigated. Currently, lime concentrate – which is a finite resource – is used as a neutralizing agent at steel production plants. Because one of the most abundant components in slag is calcium oxide, which is also the active neutralizing substance in lime concentrate, slag is a potential neutralizing agent. A total number of eight slags – four slags from Outokumpu Stainless and four slags from Sandvik Materials Technology – are examined and compared to lime concentrate.

Theoretical calculations and experimental trials are performed in order to determine if slag is able to neutralize acidic wastewater. The results show that all the slags are able to neutralize acidic wastewater, but not all slags have the same efficiency. The slags from SMT’s AOD-converter and SMT’s landfill are the most efficient in terms of total amount of neutralizing agent required to neutralize acidic wastewater. The results show that approximately four times more dry slag substance is required, when using the most efficient slag than when lime concentrate is used to neutralize acidic wastewater. The environmental and economic implications of the results are discussed.

Abstract [sv]

Denna rapport undersöker egenskaperna hos de restprodukter som produceras vid ståltillverkningen, däribland slagg och surt avfallsvatten. Mer exakt bestäms slaggernas lämplighet att agera som neutraliserings reaktant i reningsporcessen av surt avfallsvattnet från betningsprocessen. Lämpligheten mäts i mängd slagg som krävs vid neutraliseringen samt restprodukternas miljömässiga påverkan. Idag används neutraliseringsmedlet kalkkoncentrat vid stålverken, vilket är en ändlig resurs. Då en av huvudsubstanserna i slagg är kalciumoxid, vilken också är den aktiva reaktanten i neutraliserings processen, genomförs experiment med slagg som neutraliseringsmedel. Totalt analyseras åtta slagger – fyra stycken slagger från Outokumpu Stainless och fyra stycken slagger från Sandvik Materials Technology. Slaggerna jämförs med referenstestersom utförts med kalk från vardera företag.

Teoretiska beräkningar och experiment utförs för att undersöka om slagg kan neutralisera surt avfallsvatten. Resultaten visar att alla slagger fungerar som neutraliseringsmedel för det sura avfallsvattnet, dock med varierande effektivitet. Slaggen från SMT’s AOD-konverterslagg samt SMT’s deponis är mest effektiv när man ser till tillsattsmängd. Efter vidare beräkningar kan det konstateras att det krävs 4 gånger mer torrsubstans vid neutralisering med de mest effektiva slaggerna än vid

neutralisering med kalkkoncentrat. Ekonomiska och miljömässiga innebörden av resultaten diskuteras.

Place, publisher, year, edition, pages
2017. , p. 56
Keywords [en]
Slag, Neutralization, Lime, Lime Concentrate, Acidic wastewater, pH, Landfill, Byproducts
Keywords [sv]
Slagg, Neutralisering, Kalk, Kalkkoncentrat, Surt avfallsvatten, pH, Deponi, Restprodukter
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-209700OAI: oai:DiVA.org:kth-209700DiVA, id: diva2:1113907
External cooperation
Sandvik Materials Technology, Sandviken; Outokumpu Stainless, Avesta
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2017-05-15, Jernkontoret, Stockholm, 11:11 (English)
Supervisors
Examiners
Projects
NeutralsyraAvailable from: 2017-06-28 Created: 2017-06-22 Last updated: 2017-06-28Bibliographically approved

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