Influence of CaO Addition, FeO/SiO2 , and MgO/SiO2 on the Melting Characteristic Temperatures of FeO-SiO2-MgO-CaO System

Ma, Yongbo; Du, Xueyan

doi:10.1590/1980-5373-MR-2018-0645

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Articles • Mat. Res. 22 (03) • 2019 • https://doi.org/10.1590/1980-5373-MR-2018-0645 copy

Influence of CaO Addition, FeO/SiO₂ , and MgO/SiO₂ on the Melting Characteristic Temperatures of FeO-SiO₂-MgO-CaO System

Authorship SCIMAGO INSTITUTIONS RANKINGS

In order to decrease the oxidation temperature of fayalite in molten nickel slags, the influence of CaO addition, FeO/SiO₂, and MgO/SiO₂ on melting characteristic temperatures of FeO-SiO₂-MgO-CaO system were investigated. The melting characteristic temperatures, including softening temperature (T_s), hemispherical temperature (T_h), and flow temperature (T_f),were measured with hot stage microscope. Experimental results showed that the melting characteristic temperatures first decreased sharply and then increased slowly with increasing w(CaO) for samples at given FeO/SiO₂ and MgO/SiO₂ ratios. The melting characteristic temperatures of samples without CaO addition were much higher than that of samples with different CaO addition, which was mainly caused by the phase components at different compositions. The variation of melting characteristic temperatures were described in detail. Phase components and liquid fractions were calculated by FactSage 7.1, which was good agreement with the XRD patterns.

Key words:
melting characteristic temperature; nickel slag; FeO/SiO₂; MgO/SiO₂; w(CaO)

Sample	F/S	FeO^* * Assumed stoichiometric.	SiO₂	MgO	CaO	Sample	F/S	FeO^* * Assumed stoichiometric.	SiO₂	MgO	CaO
S1-1	1.33	47.24	35.52	17.24	0.00	S2-1	0.40	52.14	34.18	13.67	0.00
S1-2	1.33	44.41	33.39	16.20	6.00	S2-2	0.40	49.01	32.13	12.85	6.00
S1-3	1.33	41.57	31.26	15.17	12.00	S2-3	0.40	45.88	30.08	12.03	12.00
S1-4	1.33	38.74	29.13	14.13	18.00	S2-4	0.40	42.76	28.03	11.21	18.00
S1-5	1.33	35.90	27.00	13.10	24.00	S2-5	0.40	39.63	25.98	10.39	24.00
S1-6	1.53	50.66	33.22	16.12	0.00	S2-6	0.50	50.66	33.22	16.12	0.00
S1-7	1.53	47.63	31.22	15.15	6.00	S2-7	0.50	47.63	31.22	15.15	6.00
S1-8	1.53	44.59	29.23	14.18	12.00	S2-8	0.50	44.59	29.23	14.18	12.00
S1-9	1.53	41.55	27.24	13.22	18.00	S2-9	0.50	41.55	27.24	13.22	18.00
S1-10	1.53	38.51	25.24	12.25	24.00	S2-10	0.50	38.51	25.24	12.25	24.00
S1-11	1.73	53.81	31.10	15.09	0.00	S2-11	0.60	48.81	32.00	19.20	0.00
S1-12	1.73	50.58	29.24	14.19	6.00	S2-12	0.60	45.88	30.08	18.05	6.00
S1-13	1.73	47.35	27.37	13.28	12.00	S2-13	0.60	42.95	28.16	16.89	12.00
S1-14	1.73	44.12	25.50	12.38	18.00	S2-14	0.60	40.02	26.24	15.74	18.00
S1-15	1.73	40.89	23.64	11.47	24.00	S2-15	0.60	37.09	24.32	14.59	24.00

Sample	T_s	T_h	T_f	Sample	T_s	T_h	T_f
S1-1	1574	1626	1641	S2-1	1550	1660	1669
S1-2	1455	1486	1543	S2-2	1467	1581	1607
S1-3	1452	1457	1462	S2-3	1450	1473	1502
S1-4	1466	1473	1474	S2-4	1457	1463	1466
S1-5	1475	1488	1491	S2-5	1480	1485	1487
S1-6	1547	1646	1656	S2-6	1547	1646	1656
S1-7	1465	1519	1561	S2-7	1465	1519	1561
S1-8	1463	1475	1489	S2-8	1463	1475	1489
S1-9	1474	1483	1486	S2-9	1474	1483	1486
S1-10	1480	1492	1495	S2-10	1480	1492	1495
S1-11	1496	1634	1651	S2-11	1553	1590	1627
S1-12	1450	1545	1585	S2-12	1463	1506	1533
S1-13	1453	1465	1483	S2-13	1460	1472	1478
S1-14	1469	1475	1477	S2-14	1475	1481	1483
S1-15	1485	1495	1497	S2-15	1488	1495	1497

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