Preparation and Properties of Solid Waste-Based Ecological Mine Backfill Materials under Multi-Factor Interactions

doi:10.16552/j.cnki.issn1001-1625.2025.1229

Abstract

Abstract:

Using fly ash and desulfurization gypsum as the main raw materials， a multi-solid waste， high foaming， high rheological， medium-strength solid waste-based ecological mine filling material was prepared in this paper. The influences of water-binder ratio， fly ash content， foaming ratio and other factor on the slump flow and 28 d compressive strength of backfill material were analyzed. The properties of solid waste-based ecological mine backfill material were studied through fluidity tests， strength tests， and microstructure tests. The results indicate that the basic mix proportion of material is as follows： water-binder ratio of 0.51 to 0.55， fly ash content of 55% to 60% （mass fraction）， desulfurization gypsum content of 15% to 20% （mass fraction）， foaming ratio of 2.0 times to 3.0 times， and water reducer content of 0.6% to 0.8% （mass fraction）. At this mix proportion， the slump flow of the material is 226 mm to 273 mm and the 28 d compressive strength is 2.11 MPa to 5.93 MPa. When the solid waste content is 60% to 70%， desulfurization gypsum and fly ash form a synergistic system with a mass ratio of approximately 1∶4， generating an interlocking structure of calcium silicate hydrate gel and ettringite. The microstructure confirms that the macroscopic mechanical properties of material have been improved. The hydration products can effectively immobilize heavy metals， with low ecological risk， meeting the environmental safety requirements for mine backfill.

Key words: solid waste-based ecological material, mine backfill, mechanical property, rheological property, microstructure

CLC Number:

TU528.09

HAO Yunhong, TONG Haiyan, WANG Dongmin, SUN Hao, DU Genjie. Preparation and Properties of Solid Waste-Based Ecological Mine Backfill Materials under Multi-Factor Interactions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(7): 2466-2477.

Figures/Tables 11

References 25

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Sample No.	Factor					28 d compressive strength/MPa	Slump flow/mm
Sample No.	A	B/%	C/%	D	E/%	28 d compressive strength/MPa	Slump flow/mm
L1	0.45	45	5	2.0	0.2	4.45	201
L2	0.45	50	10	2.5	0.4	3.79	221
L3	0.45	55	15	3.0	0.6	2.71	229
L4	0.45	60	20	3.5	0.8	0.68	233
L5	0.48	45	10	3.0	0.8	2.16	227
L6	0.48	50	5	3.5	0.6	0.92	210
L7	0.48	55	15	2.5	0.4	5.26	237
L8	0.48	60	20	2.0	0.2	3.68	233
L9	0.51	45	15	3.0	0.4	0.71	213
L10	0.51	50	20	2.5	0.2	2.64	226
L11	0.51	55	5	2.0	0.8	3.97	249
L12	0.51	60	10	3.5	0.6	5.93	261
L13	0.55	45	5	2.5	0.6	3.75	244
L14	0.55	50	10	2.0	0.8	5.83	273
L15	0.55	55	15	3.5	0.2	1.05	231
L16	0.55	60	20	3.0	0.4	2.11	252

Sample No.	Factor					28 d compressive strength/MPa	Slump flow/mm
Sample No.	A	B/%	C/%	D	E/%	28 d compressive strength/MPa	Slump flow/mm
L1	0.45	45	5	2.0	0.2	4.45	201
L2	0.45	50	10	2.5	0.4	3.79	221
L3	0.45	55	15	3.0	0.6	2.71	229
L4	0.45	60	20	3.5	0.8	0.68	233
L5	0.48	45	10	3.0	0.8	2.16	227
L6	0.48	50	5	3.5	0.6	0.92	210
L7	0.48	55	15	2.5	0.4	5.26	237
L8	0.48	60	20	2.0	0.2	3.68	233
L9	0.51	45	15	3.0	0.4	0.71	213
L10	0.51	50	20	2.5	0.2	2.64	226
L11	0.51	55	5	2.0	0.8	3.97	249
L12	0.51	60	10	3.5	0.6	5.93	261
L13	0.55	45	5	2.5	0.6	3.75	244
L14	0.55	50	10	2.0	0.8	5.83	273
L15	0.55	55	15	3.5	0.2	1.05	231
L16	0.55	60	20	3.0	0.4	2.11	252

Factor	Degree of freedom	Sum of square	Mean square	F	P
A	3	2.978	0.992	0.140	0.937
B	3	1.961	0.653	0.090	0.965
C	3	0.914	0.304	0.040	0.988
D	3	82.636	27.545	42.100	0
E	3	1.999	0.666	0.090	0.964

Factor	Degree of freedom	Sum of square	Mean square	F	P
A	3	2.978	0.992	0.140	0.937
B	3	1.961	0.653	0.090	0.965
C	3	0.914	0.304	0.040	0.988
D	3	82.636	27.545	42.100	0
E	3	1.999	0.666	0.090	0.964

Factor	Degree of freedom	Sum of square	Mean square	F	P
A	3	1 951.00	650.50	2.31	0.13
B	3	1 146.00	381.80	1.09	0.39
C	3	187.00	62.33	0.15	0.93
D	3	954.50	318.20	0.87	0.48
E	3	1 093.00	364.20	1.03	0.41