Experiments and Application of Reclamation of High-Mineralized Mine Wastewater for Confecting Grouting Slurry

LI, TAO; LIU, YU; GAO, YING; YANG, JUNWEI

doi:10.1590/0001-3765202120190057

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ENGINEERING SCIENCES • An. Acad. Bras. Ciênc. 94 (1) • 2022 • https://doi.org/10.1590/0001-3765202120190057 copy

Experiments and Application of Reclamation of High-Mineralized Mine Wastewater for Confecting Grouting Slurry

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Owing to the high mineralization and high treatment cost, Ordovician limestone water is often regarded as a mine wastewater. In order to make rational use of mine water with high mineralization and turn waste into treasure. In this work, the natural water quality of Ordovician mine water in the Weibei coalfield had been tested, and the suspended matter and trace elements of Ordovician mine water in the selected deep detained area had been further tested. As a contrast, the water quality of Ordovician mine water after heating and concentration had been tested. The mechanical and hydraulic parameters of concentrated mine water-loess and concentrated mine water-cement slurry had been tested and compared with conventional slurry. The results showed characteristics of deep detained Ordovician limestone mine water is high salinity, certain suspended matters, limited special material and high permanent hardness. However, compressive strength of loess samples increased, while the permeability reduced. The initial setting-time of the modified material was short, while it showed an increased compressive strength. In practical terms, the quantity of grouting produced in engineering applications can be reduced by 16%, whereas the discharge of high-mineralized mine water can be decreased by about 40,000 m³/a.

Key words
mine water; mineralized; coal mining; water-proof material; grouting

No.	Na⁺	K⁺	Ca²⁺	Mg²⁺	SO₄ ^2-	HCO₃ ^-	Cl^-	pH	TDS
H1	202.30	9.70	405.10	63.90	1001.40	421.50	270.60	6.48	2379.00
H2	408.10	19.40	835.90	151.10	2237.00	307.50	641.40	7.42	4614.20
H3	359.30	26.20	684.10	91.40	1744.40	583.10	325.60	7.26	3826.30
H4	390.20	14.90	533.50	184.60	2102.10	222.40	716.30	7.09	4375.30
H5	488.90	10.60	435.40	147.50	1522.30	248.00	595.30	7.18	3497.80
H6	545.20	13.90	513.10	171.40	1762.50	229.10	649.40	7.01	3879.00
C1	102.10	10.00	215.30	87.80	602.40	319.20	200.70	7.60	1545.80
C2	109.10	13.40	146.20	50.70	625.60	297.90	115.10	7.50	1364.60
T1	3.50	-	88.10	29.20	168.10	274.60	12.40	8.00	575.90
P1	5.70	-	66.10	24.90	22.10	295.90	10.60	8.00	425.50

No.	Li	Be	Sc	Ti	V	Mn	Cr	Co
1	106	0.033	14.1	2.73	54.6	149	78	2.08
2	73.4	0.161	10.5	1.14	6	8.23	70	0.438
3	198	<0.002	11.3	2.91	26.4	7.53	32.8	3.71
No.	Ni	Cu	Zn	Ga	Rb	Y	Nb	Mo
1	28.9	8.15	35.3	0.125	17.4	0.062	0.027	1.63
2	6.15	3.78	17.9	0.025	23.4	2.22	0.002	0.959
3	48.6	10.1	25.4	0.069	17.1	0.154	0.018	0.949
No.	Cd	Sb	Cs	Ba	La	Ce	Pr	Nd
1	0.006	0.302	0.625	20.5	<0.002	<0.002	<0.002	<0.002
2	0.002	0.414	1.3	46.6	0.069	0.282	0.086	0.615
3	0.005	0.292	0.866	10.9	<0.002	<0.002	<0.002	<0.002
No.	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm
1	<0.002	<0.002	<0.002	<0.002	<0.002	<0.002	<0.002	<0.002
2	0.247	0.065	0.286	0.05	0.31	0.067	0.206	0.024
3	<0.002	<0.002	<0.002	0.002	<0.002	0.003	<0.002	<0.002
No.	Yb	Lu	W	Tl	Pb	Bi	Th	U
1	<0.002	<0.002	0.145	0.007	<0.002	<0.002	<0.002	1.64
2	0.138	0.018	<0.002	<0.002	<0.002	<0.002	0.017	0.069
3	<0.002	<0.002	0.028	<0.002	0.003	<0.002	0.015	0.07
No.	Sr	In	Zr	Hf	F
1	4011	0.005	0.009	<0.002	823
2	2415	<0.002	0.017	<0.002	1532
3	12797	<0.002	0.012	<0.002	3548

Concentration degree	Ca²⁺	Mg²⁺	SO₄ ^2-	HCO₃ ^-	Cl^-	Na⁺	TDS	pH
Non	816.81	131.34	2213.03	299.63	639.57	398.08	4518.34	6.96
50%	1160.86	206.32	3457.96	172.87	1367.46	775.63	7176.81	7.74
30%	1769.22	394.47	4967.34	58.34	1939.11	1245.33	10421.12	8.09

No.	S	I/S	I	K	Cl	O
1	25	15	22	26	10	2
2	24	15	25	23	11	2

No.	>50µm(sand particle)	5~50µm(silt particle)	<5µm(clay particle)
1	12.7	72.4	14.9
2	10.4	58.9	30.7

No.	Concentrated percentage of mine water (%)	Permeability coefficient (m/d)	Unconfined compressive strength (kPa)
1	Super ultrapure water	0.082	102
2	100	0.026	128
3	50	0.011	148
4	30	0.009	169

No.	1	2	3	4	5	6	7	8
Soaking solution	Ultra-pure water				Concentrated mine water
Viscosity	30.5	30.0	31.0	30.5	29.5	29.5	29.0	28.5
Average viscosity	30.5				29.1

Mixed with cement	Initial setting time (min)	average unconfined compressive strength (d)
Mixed with cement	Initial setting time (min)	1	3	28
Deionized water	205	6.5	19.6	49.3
50% Concentrated mine water	170	8.2	24.9	57.6
30% Concentrated mine water	150	9.8	27.3	66.4

Major elements in soil	50% Concentrated mine water	30% Concentrated mine water	Original soil
Na	0.687	0.896	0.505
Mg	0.924	0.889	0.935
Al	7.905	7.865	8.261
Si	32.878	29.744	38.717
K	1.178	0.976	1.516
Ca	2.789	3.764	0.562
Fe	3.458	3.143	3.631
Cu	0.0018	0.0016	0.0029
Zn	0.005	0.006	0.009
CO₃ ^2-	4.235	2.755	8.659
P	0.0150	0.0151	-

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[1] Correspondence to: Tao Li E-mail: qazwdx521@163.com