LTU - EX - - 10/168 - - SE - Sök - Luleå tekniska universitet

5 UTFÖRANDE AV FÖRSÖK ................................................................................................................... 37
5.1 METODIK ............................................................................................................................................ 37
5.2 INLEDANDE PROVTAGNING ................................................................................................................. 38
5.3 FULLSKALEFÖRSÖKEN........................................................................................................................ 39
5.3.1 Försök med ny syrgasbrännare....................................................................................... 40
5.3.2 Försök med extra syrgas ................................................................................................. 40
5.3.3 Tillsatsförsök.................................................................................................................... 40
5.3.3.1 Beräkningar av tillsats ........................................................................................................................ 41
5.3.3.2 Beräkningar av smälttid för tillsats ..................................................................................................... 42
5.4 PROVTAGNING.................................................................................................................................... 43
5.4.1 Referensprover ................................................................................................................ 43
5.5 ANALYSMETODER............................................................................................................................... 44
5.5.1 Totalanalys....................................................................................................................... 44
5.5.2 SEM ................................................................................................................................. 44
5.5.3 XRD ................................................................................................................................. 44
5.5.4 Laktest ............................................................................................................................. 44
6 RESULTAT ............................................................................................................................................... 45
6.1 INLEDANDE PROVTAGNING ................................................................................................................. 45
6.1.1 Ugnsprovtagning utan ny syrgasbrännare....................................................................... 45
6.1.2 Ugnsprovtagning med ny syrgasbrännare....................................................................... 45
6.2 FULLSKALEFÖRSÖK ............................................................................................................................ 46
6.2.1 Allmänna observationer ................................................................................................... 46
6.2.2 Resultat totalanalyser ...................................................................................................... 47
6.2.2.1 Notering totalanalyser......................................................................................................................... 51
6.2.3 Reslultat XRD .................................................................................................................. 52
6.2.3.1 Notering XRD-resultat ........................................................................................................................ 54
6.2.4 Resultat SEM................................................................................................................... 55
6.2.4.1 Notering SEM-resultat ........................................................................................................................ 58
6.2.5 Resultat lakning ............................................................................................................... 59
6.2.5.1 Notering lakresultat............................................................................................................................. 61
7 DISKUSSION ............................................................................................................................................ 62
7.1 FÖRSÖKSUTFÖRANDE OCH PROVTAGNING .......................................................................................... 63
7.2 TOTALANALYSER................................................................................................................................64
7.2.1 Ugnsprovtagning innan försök......................................................................................... 64
7.2.2 Halt järnoxid i olika typer av slaggprov ............................................................................ 64
7.2.3 Variationer av övriga halter i prov.................................................................................... 65
7.2.4 Processparametrars inverkan.......................................................................................... 65
7.2.5 Primär kristallisation......................................................................................................... 66
7.3 XRD................................................................................................................................................... 67
7.3.1 De olika faserna............................................................................................................... 67
7.3.2 Förskjutning av FeO och larnit......................................................................................... 68
7.3.3 Analyskvalitet XRD .......................................................................................................... 68
7.4 SEM ................................................................................................................................................... 69
7.4.1 Fel i punktanalyser........................................................................................................... 69
7.4.2 Resultat SEM................................................................................................................... 69
7.4.3 SEM-bilder ....................................................................................................................... 70
7.4.4 Felkällor SEM................................................................................................................... 70
7.5 LAKNING ............................................................................................................................................ 71
7.5.1 Lakning och järnoxid........................................................................................................ 71
7.5.2 Lakning och stelningshastighet........................................................................................ 72
7.5.3 Lakning och primär fasbildning........................................................................................ 72
7.5.4 Lakning och lakbarhet...................................................................................................... 73
7.5.5 Skaklakning och kolonnlakning........................................................................................ 73
7.5.6 Olika slaggprov ................................................................................................................ 73
7.5.7 Felkällor lakning............................................................................................................... 73
7.6 ÖVRIGA IAKTTAGELSER...................................................................................................................... 74