Grinding Characteristics and Gelling Activity of Siliceous Iron Ore Tailings Under Different Activation Modes

doi:10.12068/j.issn.1005-3026.2024.07.015

Abstract

Abstract:

Mechanical activation is a commonly used method to improve the activity of tailings， and adding chemical activators to the grinding system is a more effective method. Five types of activators were used to compare and analyze the grinding characteristics and early gelation activity of siliceous iron ore tailings （IOTs） using single and composite methods. Iron ore tailings powder was prepared by mechanical activation and mechanochemical activation， and the grinding characteristics of IOTs after grinding were measured， including specific surface area， particle size distribution （PSD）， and gelation activity at 3， 7， 28 d. The hydration products were analyzed by using XRD and SEM. The conclusion shows that the addition of various activators can increase the specific surface area of IOTs within the same grinding time， and the mechanical chemical activation with the addition of composite activators at 90 minutes of grinding can increase by up to 30.43% compared with mechanical activation. The addition of activators improves the grinding efficiency of IOTs， resulting in a narrower PSD range. The strength increase of cementitious system in the early stage of hydration is mainly due to the fact that activator can promote the formation of ettringite， while the strength increase in the later stage is due to the improvement of tailings activity. This study is of great significance for the efficient utilization of siliceous iron ore tailings.

Key words: siliceous iron ore tailings, mechanical?chemical activation, grinding characteristics, gelling activity, hydration products

CLC Number:

TU 528

Shu-hong WANG, Chang-yu LIU, Qin-kuan HOU, Ying CAO. Grinding Characteristics and Gelling Activity of Siliceous Iron Ore Tailings Under Different Activation Modes[J]. Journal of Northeastern University(Natural Science), 2024, 45(7): 1028-1036.

Figures/Tables 20

Table 1 P.I 42.5 cement performance

比表面积/(m²·kg^-1)	凝结时间/min		抗压强度/MPa
比表面积/(m²·kg^-1)	初凝	终凝	3 d	7 d	28 d
358	172	234	26.45	33.09	46.85

Table 2 Chemical composition of cement and iron tailings （mass fraction）

材料	SiO₂	Al₂O₃	CaO	Fe₂O₃	MgO	SO₃	Na₂O
水泥	20.60	4.57	63.27	2.59	3.29	2.11	0.55
铁尾矿	74.89	4.39	4.28	9.78	4.52	0.47	0.59

Fig.1 Morphology of undisturbed IOTs particles

Fig.2 IOTs specific surface area under different grinding time

Fig.3 IOTs ball mill jar for 180 min grinding

Fig.4 Compressive strength and activity index of cement mortar mixed with mechanically activated IOTs

Fig.5 Effect of single activator dosage on specific surface area of IOTs

Fig.6 Effect of single activator on IOTs gelling activity

Fig.7 Effect of composite activators dosage on specific surface area of IOTs

Fig.8 Effect of composite activators dosage on IOTs gelling activity

Fig.9 Effects of grinding time on IOTs specific surface area

Fig.10 Effects of grinding time on IOTs gelling activity

Fig.11 Particle size distribution curves of different activation modes

Table 3 The particle size of IOTs under different activation modes

编号	体积分数
编号	<1.13 μm	1.13~4.03 μm	4.04~9.86 μm	9.87~21.2 μm	21.3~40.1 μm	40.2~58.9 μm	>58.9 μm
A1	4.50	13.99	15.37	17.79	18.26	11.93	18.14
A2	7.51	21.16	19.27	20.92	19.50	7.88	3.72
A3	9.56	23.65	19.43	20.91	17.83	6.18	2.43
A4	11.48	24.9	19.28	20.24	16.27	5.35	2.49
A5	12.24	25.69	19.35	20.33	15.64	4.89	1.85
A6	5.14	28.54	20.19	16.01	9.42	1.97	18.72
D1	2.82	16.99	18.79	19.01	21.18	14.11	7.10
D2	4.58	24.35	23.51	24.17	16.55	3.74	3.09
D3	6.95	29.66	23.59	22.96	12.83	2.30	1.39
D4	8.68	31.79	23.21	21.70	11.18	2.27	1.92
D5	8.09	33.30	23.77	21.41	9.80	2.26	1.38

Fig.12 Particle distribution of IOTs

Fig.13 RRB equation of activated tailings

Table 4 RRB equation parameters of iron tailings

编号	相关系数	$d e$ /μm	n
A1	0.992	27.4	0.88
A2	0.990	16.4	0.93
A3	0.988	14.5	0.91
A4	0.992	12.7	0.82
A5	0.989	11.2	0.86
A6	0.849	14.5	0.69
D1	0.972	24.1	1.05
D2	0.965	12.7	0.95
D3	0.972	9.86	0.91
D4	0.978	8.68	0.92
D5	0.970	7.64	0.93

Table 4 RRB equation parameters of iron tailings

编号	相关系数	$d e$ /μm	n
A1	0.992	27.4	0.88
A2	0.990	16.4	0.93
A3	0.988	14.5	0.91
A4	0.992	12.7	0.82
A5	0.989	11.2	0.86
A6	0.849	14.5	0.69
D1	0.972	24.1	1.05
D2	0.965	12.7	0.95
D3	0.972	9.86	0.91
D4	0.978	8.68	0.92
D5	0.970	7.64	0.93

Fig.14 XRD pattern of composite cementitious system 3 d

Fig.15 XRD pattern of composite cementitious system 28 d

Fig.16 The micromorphology of hydration products

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