Influences of MgO and Al2O3 on the mineralogical properties of calcium ferrite in iron ore sinter

doi:10.13745/j.esf.sf.2020.5.44

Abstract

Abstract:

Calcium ferrite is the main binder phase mineral in high basicity sintered ore. Its mineralogical characteristics such as content, crystal form, chemical composition and crystal structure play a key role in the quality of the sintered ore. The content directly affects the formation of calcium ferrite. In this paper, we used the chemically pure reagents of Fe₃O₄, SiO₂, CaO, MgO, and Al₂O₃ as raw materials and carried out micro-sintering experiments in the laboratory. Using XRD, polarizing microscope, electron microprobe and other means we performed quantitative analyses of MgO and Al₂O₃ in the raw material components to investigate the formation of calcium ferrite in sintered ores and its influence on mineralogical properties. The results showed that the increase of MgO content in the raw material had a certain inhibitory effect on the formation of calcium ferrite, especially when the MgO content was 2.0% to 3.0%. The calcium ferrite content in the sinter was significantly reduced, and its crystal morphology also changed from plate columnar and needle-like shape gradually transitioning to an irregular shape. The increase in Al₂O₃ in the raw material promoted the formation of calcium ferrite in the sinter as calcium ferrite content increased significantly with increasing Al₂O₃ and ferric acid contents. The morphology of calcium also changed from columnar and needle-shaped to columnar. Electronic probe composition analysis and mineral chemical formula calculation results show that calcium ferrite is a complex crystal composed of Fe₂O₃, CaO, SiO₂, Al₂O₃ and MgO, and its chemical formula is Ca_2.60Mg_0.44Si_1.07Al_0.96Fe_8.92O₂₀. The changes in MgO and Al₂O₃ contents in the raw materials had little effect on the mole fraction ratio of Fe₂O₃ to CaO in the chemical composition of calcium ferrite, both were close to 3∶2. The above research results are of great guiding significance for an in-depth understanding of the chemical characteristic of calcium ferrite crystal phase under sintering process conditions and its effect on the quality of sinter.

Key words: calcium ferrite, mineralogical property, MgO, Al₂O₃, iron ore sinter

CLC Number:

HAN Xiuli, SI Tianhang, LI Mingduo, ZHOU Xiang, LIU Lei, ZHAO Kai. Influences of MgO and Al₂O₃ on the mineralogical properties of calcium ferrite in iron ore sinter[J]. Earth Science Frontiers, 2020, 27(5): 280-290.

Figures/Tables 16

References 39

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编号	w_B/%					碱度
编号	Fe₃O₄	SiO₂	CaO	MgO	Al₂O₃	碱度
M1.0	82.5	5.0	10.0	1.0	1.5	2.0
M1.5	82.0	5.0	10.0	1.5	1.5	2.0
M2.0	81.5	5.0	10.0	2.0	1.5	2.0
M2.5	81.0	5.0	10.0	2.5	1.5	2.0
M3.0	80.5	5.0	10.0	3.0	1.5	2.0
A1.0	82.5	5.0	10.0	1.5	1.0	2.0
A1.5	82.0	5.0	10.0	1.5	1.5	2.0
A2.0	81.5	5.0	10.0	1.5	2.0	2.0
A2.5	81.0	5.0	10.0	1.5	2.5	2.0
A3.0	80.5	5.0	10.0	1.5	3.0	2.0

编号	w_B/%					碱度
编号	Fe₃O₄	SiO₂	CaO	MgO	Al₂O₃	碱度
M1.0	82.5	5.0	10.0	1.0	1.5	2.0
M1.5	82.0	5.0	10.0	1.5	1.5	2.0
M2.0	81.5	5.0	10.0	2.0	1.5	2.0
M2.5	81.0	5.0	10.0	2.5	1.5	2.0
M3.0	80.5	5.0	10.0	3.0	1.5	2.0
A1.0	82.5	5.0	10.0	1.5	1.0	2.0
A1.5	82.0	5.0	10.0	1.5	1.5	2.0
A2.0	81.5	5.0	10.0	1.5	2.0	2.0
A2.5	81.0	5.0	10.0	1.5	2.5	2.0
A3.0	80.5	5.0	10.0	1.5	3.0	2.0

样号	黏结相含量/%			金属相含量/%		其他含量/%
样号	铁酸钙	玻璃质	硅酸二钙	磁铁矿	赤铁矿	氧化钙
M1.0	40~45	5~10	微量	25~30	20~25	微量
M1.5/ A1.5	35~40	5~10	微量	35~40	15~20	微量
M2.0	35~40	5~10	1~2	40~45	10~15	微量
M2.5	30~35	5~10	1~2	45~50	10~15	微量
M3.0	25~30	5~10	2~3	55~60	5~10	微量
A1.0	25~30	10~15	微量	35~40	15~20	3~5
A2.0	40~45	5~8	微量	35~40	10~15	微量
A2.5	45~50	5~8	微量	30~35	10~15	微量
A3.0	50~55	3~5	微量	25~30	10~15	3~5

样号	黏结相含量/%			金属相含量/%		其他含量/%
样号	铁酸钙	玻璃质	硅酸二钙	磁铁矿	赤铁矿	氧化钙
M1.0	40~45	5~10	微量	25~30	20~25	微量
M1.5/ A1.5	35~40	5~10	微量	35~40	15~20	微量
M2.0	35~40	5~10	1~2	40~45	10~15	微量
M2.5	30~35	5~10	1~2	45~50	10~15	微量
M3.0	25~30	5~10	2~3	55~60	5~10	微量
A1.0	25~30	10~15	微量	35~40	15~20	3~5
A2.0	40~45	5~8	微量	35~40	10~15	微量
A2.5	45~50	5~8	微量	30~35	10~15	微量
A3.0	50~55	3~5	微量	25~30	10~15	3~5

样号	铁酸钙体积分数/%
样号	总量	针状	柱状	不规则状
M1.0	40~45	15~20	10~15	10~15
M1.5/A1.5	35~40	15~20	10~15	5~10
M2.0	35~40	10~15	15~20	5~10
M2.5	30~35	5~10	10~15	10~15
M3.0	25~30	5~10	10~15	5~10
A1.0	25~30	10~15	5~10	5~10
A2.0	40~45	15~20	15~20	5~10
A2.5	45~50	10~15	10~15	20~25
A3.0	50~55	5~10	15~20	25~30

Influences of MgO and Al₂O₃ on the mineralogical properties of calcium ferrite in iron ore sinter

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样号	序号	w_B/%						备注
样号	序号	Fe₂O₃	CaO	MgO	SiO₂	Al₂O₃	合计	备注
M1.0	1	82.69	9.77	3.05	1.80	3.99	101.30	柱状
	2	81.66	10.08	2.91	2.01	4.19	100.85	柱状
	3	77.33	12.91	1.95	3.63	4.57	100.39	针状
	4	79.72	10.37	2.77	2.44	4.79	100.09	它形
M1.5	5	67.16	16.94	2.43	8.08	4.10	98.71	柱状
M1.5	6	70.61	15.09	2.45	5.66	4.65	98.46	它形
M2.0	7	72.37	15.30	1.52	7.15	3.88	100.22	针状
	8	72.12	15.88	1.61	7.11	3.93	100.65	柱状
	9	72.64	15.57	1.63	7.09	4.30	101.23	它形
	10	69.22	18.13	1.47	8.58	3.95	101.35	它形
M2.5	11	78.21	11.66	1.82	3.90	3.80	99.39	针状
	12	77.31	12.38	1.29	3.82	3.67	98.47	柱状
	13	77.65	12.60	1.22	4.09	3.87	99.43	它形
	14	77.61	11.69	1.43	3.91	3.79	98.43	它形
M3.0	15	73.78	15.59	1.20	6.74	3.72	101.03	柱状
	16	74.07	15.56	1.27	6.97	3.81	101.68	针状
	17	73.82	15.46	1.19	6.91	3.19	100.57	它形
	18	73.24	15.79	1.30	6.99	3.43	100.75	它形
	19	72.51	16.19	1.04	6.85	3.82	100.41	它形
	20	72.53	16.17	1.02	6.81	4.07	100.60	它形

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样号	序号	w_B/%						备注
样号	序号	Fe₂O₃	CaO	MgO	SiO₂	Al₂O₃	合计	备注
A1.0	1	70.42	15.92	1.70	6.86	3.11	98.01	柱状
	2	70.48	15.5	2.32	7.37	2.46	98.13	柱状
	3	70.26	15.49	2.16	7.99	2.70	98.60	针状
	4	69.57	15.77	0.96	7.63	3.01	96.94	它形
A1.5	5	67.16	16.94	2.43	8.08	4.10	98.71	柱状
A1.5	6	70.61	15.09	2.45	5.66	4.65	98.46	针状
A2.0	7	69.87	15.81	1.04	7.98	6.30	101.00	针状
	8	69.75	16.10	0.89	8.05	6.11	100.90	柱状
	9	69.10	15.26	1.67	8.94	4.45	99.42	它形
	10	69.08	15.86	1.29	8.74	6.76	101.73	它形
A2.5	11	68.99	15.40	2.17	7.74	6.25	100.55	柱状
	12	68.69	15.39	1.72	7.04	8.23	101.07	柱状
	13	69.44	14.46	2.27	6.65	7.19	100.01	针状
	14	70.32	14.29	2.09	6.52	7.22	100.44	它形
	15	68.13	14.78	1.89	6.84	7.82	99.46	它形
A3.0	16	61.56	15.36	1.40	9.38	10.99	98.69	柱状
A3.0	17	61.15	15.27	1.51	9.46	11.15	98.54	它形

样号	序号	w_B/%						备注
样号	序号	Fe₂O₃	CaO	MgO	SiO₂	Al₂O₃	合计	备注
A1.0	1	70.42	15.92	1.70	6.86	3.11	98.01	柱状
	2	70.48	15.5	2.32	7.37	2.46	98.13	柱状
	3	70.26	15.49	2.16	7.99	2.70	98.60	针状
	4	69.57	15.77	0.96	7.63	3.01	96.94	它形
A1.5	5	67.16	16.94	2.43	8.08	4.10	98.71	柱状
A1.5	6	70.61	15.09	2.45	5.66	4.65	98.46	针状
A2.0	7	69.87	15.81	1.04	7.98	6.30	101.00	针状
	8	69.75	16.10	0.89	8.05	6.11	100.90	柱状
	9	69.10	15.26	1.67	8.94	4.45	99.42	它形
	10	69.08	15.86	1.29	8.74	6.76	101.73	它形
A2.5	11	68.99	15.40	2.17	7.74	6.25	100.55	柱状
	12	68.69	15.39	1.72	7.04	8.23	101.07	柱状
	13	69.44	14.46	2.27	6.65	7.19	100.01	针状
	14	70.32	14.29	2.09	6.52	7.22	100.44	它形
	15	68.13	14.78	1.89	6.84	7.82	99.46	它形
A3.0	16	61.56	15.36	1.40	9.38	10.99	98.69	柱状
A3.0	17	61.15	15.27	1.51	9.46	11.15	98.54	它形