Bibliographic Details
| Title: |
EFFECT OF ROTATION RATES ON DISSOLUTION BEHAVIOR OF LIME IN CaO-FetO-SiO2-MgO SYSTEM. |
| Alternate Title: |
EFEKAT BRZINE ROTACIJE NA RASTVARANJE KREČA U SISTEMU CaO-FetO-SiO2-MgO. |
| Authors: |
Jia, C.1, Mou, Q.-Q.2, Yu, Y.3, Muvunyi, R. A.1, Zhang, M.-X.1, Li, J.-L.1 jli@wust.edu.cn |
| Source: |
Journal of Mining & Metallurgy. Section B: Metallurgy. 2024, Vol. 60 Issue 3, p317-327. 11p. |
| Subject Terms: |
*ELECTRONIC probes, *MELTING points, *SOLID solutions, *X-ray diffractometers, *SLAG, *OLIVINE, *MASS transfer coefficients, *MASS transfer |
| Abstract (English): |
For the converter steelmaking process, incompletely dissolved lime will exist in steel slag in the form of f-CaO, which reduces the utilization rate of metallurgical slag and causes the waste of resources. It is extremely important to reduce the production of f-CaO in steel slag and promote the rapid and sufficient dissolution of lime. This paper is based on the early and middle stages of the converter slag-forming route based on the CaO component. The dissolution rate of lime in four different slags was measured by rotating rod method. The evolution behavior of the lime-slag interface and the change behavior of the lime dissolution rate were studied by X-ray diffractometer and an electron probe micro-analyzer. The experimental results show that CaO-FeO solid solutions and (Ca, Mg, Fe) olivine are formed when lime reacts with molten slag at 1400 ℃. When the FeO content decreases, CaO reacts with the calcium-magnesia-silica to form a high melting point and dense 2CaO·SiO2 layer. In addition, at different rotation rates, a 3CaO·SiO2 phase layer is formed between the CaOFeO solid solution layer and the C2S layer. As the rotation rate increases, the dissolution rate of lime also increases and the mass transfer coefficient reaches the maximum at a rotation rate of 180 rpm. The maximum values are 20.54×10-6 m/s, 7.86×10-6m/s, 9.38×10-6m/s, 5.53×10-6 m/s, respectively. [ABSTRACT FROM AUTHOR] |
| Abstract (Bosnian): |
Za proces konvertorske proizvodnje čelika, nepotpuno rastvoreni kreč prisutan je u čeličnoj šljaci u obliku f-CaO, što smanjuje stepen iskorišćenja metalurške šljake i dovodi do rasipanja resursa. Izuzetno je važno smanjiti proizvodnju f-CaO u šljaci i podstaći brzo i potpuno rastvaranje kreča. Ovaj rad se bazira na ranim i srednjim fazama formiranja šljake u konvertoru, uzimajući u obzir CaO komponentu. Brzina rastvaranja kreča u četiri različite šljake ispitana je metodom rotirajuće šipke. Ponašanje na granici kreč-šljaka i promene u brzini rastvaranja kreča proučavani su pomoću rendgenske difrakcije i elektronske sonde mikroanalizatora. Eksperimentalni rezultati pokazuju da se CaO-FeO čvrsta rastvorna faza i (Ca, Mg, Fe) olivin formiraju kada kreč reaguje s tečnom šljakom na 1400℃. Kada se sadržaj FeO smanji, CaO reaguje sa kalcijum-magnezijum-silikatom i formira sloj 2CaO SiO2 visoke tačke topljenja i velike gustine. Pored toga, pri različitim brzinama rotacije, formira se sloj 3CaO SiO2 između sloja CaO-FeO čvrste rastvorne faze i sloja C2S. Kako se brzina rotacije povećava, brzina rastvaranja kreča takođe raste, a koeficijent prenosa mase dostiže maksimum pri brzini rotacije od 180 obrtaja u minuti. Maksimalne vrednosti iznose 20,54×10-6 m/s, 7,86×10-6m/s, 9,38×10-9 m/s i 5,53×10-6 m/s. [ABSTRACT FROM AUTHOR] |
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