电解锰渣对熟石灰-矿渣体系硫酸盐激发性能研究

doi:10.19964/j.issn.1006-4990.2024-0153

Abstract

Abstract:

Electrolytic manganese residue（EMR），as an industrial solid waste，contains a large amount of heavy metals，ammonia nitrogen，and sulfates，posing great harm to the environment and human health.To address this issue，this study utilized the sulfate rich nature of EMR as a sulfate activator to investigate the sulfate activation effect，hydration mechanism，microstructure，and pollutant solidification mechanism of EMR in the hydrated lime-slag system.The results from compressive strength，XRD，and SEM-EDS testing showed that EMR had a positive effect on the sulfate activation of the limestone-slag system，with the optimal ratio of 50% EMR，46% slag，and 4% quicklime.The compressive strengths at 3 d，7 d，and 28 d were 15.55，27.44 and 44.52 MPa，respectively，which were 1.65，1.80 and 1.97 times higher compared to the limestone-slag system without EMR at the corresponding ages.Under EMR activation，the hydration products of the hydrated lime-slag system were AFt（ettringite） and C-（A）-S-H （calcium silicate hydrate），interwoven to form a dense network structure.Whereas the main hydration products of the hydrated lime-slag system were C-（A）-S-H with larger pores in the transition interface zone.The released OH^- and the formation of hydrated products including AFt，AFM and C-（A）-S-H and

in the EMR-hydrated lime-slag system facilitated ion exchange，adsorption，encapsulation，and precipitation of heavy metals and ammonia nitrogen in EMR，ultimately meeting the leaching toxicity requirements of GB 8978—1996 emission standards.

Key words: electrolytic manganese residue, industrial solid waste, sulfate, hydration mechanism, heavy metals

CLC Number:

TQ178

NI Dong, TANG Liang, HE Zhaoyi, WANG Jian, PEI Shanshan, XIA Lei. Study on sulfate activation performance of electrolytic manganese residue in hydrated lime-slag system[J]. Inorganic Chemicals Industry, 2024, 56(11): 151-157.

Figures/Tables 11

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References 16

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原料	w（SiO₂）	w（Al₂O₃）	w（CaO）	w（Fe₂O₃）	w（SO₃）	w（MnO）	w（Na₂O）	w（K₂O）	w（MgO）	w（TiO₂）	w（P₂O₅）	w（其他）
EMR	34.03	8.96	12.78	5.44	25.05	2.01	0.82	2.12	0.99	0.52	0.45	6.83
矿渣	28.22	13.52	50.82	0.38	2.45	0.18	0.32	0.62	0.41	0.53		2.55

样品	w （EMR）/%	w （熟石灰）/%	w （矿渣）/%	W/C	C/S
A0		4	96	1/2	1/3
A1	10	4	86	1/2	1/3
A2	30	4	66	1/2	1/3
A3	50	4	46	1/2	1/3
A4	10	6	84	1/2	1/3
A5	30	6	64	1/2	1/3
A6	50	6	44	1/2	1/3
A7	10	8	82	1/2	1/3
A8	30	8	62	1/2	1/3
A9	50	8	42	1/2	1/3

元素	质量浓度/ （mg·L^-1）	GB 8978—1996 限值/（mg·L^-1）	GB 5085.3—2007限值/（mg·L^-1）
Mn	1 220	2.0
NH₃-N	149	15
Hg	0.000 17	0.05	0.1
Pb	0.013 2	1.0	5
Cd	0.073 2	0.1	1
Cr	0.025 2	1.5	15
Cu	0.464	0.5	100
Zn	1.7	2.0	100
Be		0.005	0.02
Ba	0.498		100
Ni	0.974	1.0	5
Ag	0.013 2	0.5
As	0.000 82	0.5	5
Se	0.001 51		1
氟化物	0.669	10	100

组别	浸出毒性质量浓度/（mg·L^-1）
组别	Mn	NH₃-N	Hg	Pb	Cd	Cr	Cu	Zn	Ba
EMR	1 220	149	0.000 17	0.013 2	0.073 2	0.025 2	0.464	1.7	0.498
A3	0.131 6	0.154 5	0.000 5	0.002 5	0.022 5	0.005 6	0.225	0.038	0.292
A6	0.102 4	0.098 2	0.000 1	0.005 4	0.042 8	—	0.264	0.886	0.235
A9	0.083 8	0.056 5	0.000 1	0.000 8	0.016 4	—	0.096	1.286	0.108
GB 8978—1996限值	2.0	15	0.05	1.0	0.1	1.5	0.5	2.0

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Inorganic Acid-Base-Salt Committee of CIESC

Study on sulfate activation performance of electrolytic manganese residue in hydrated lime-slag system

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样品	w （EMR）/%	w （熟石灰）/%	w （矿渣）/%	W/C	C/S
A0		4	96	1/2	1/3
A1	10	4	86	1/2	1/3
A2	30	4	66	1/2	1/3
A3	50	4	46	1/2	1/3
A4	10	6	84	1/2	1/3
A5	30	6	64	1/2	1/3
A6	50	6	44	1/2	1/3
A7	10	8	82	1/2	1/3
A8	30	8	62	1/2	1/3
A9	50	8	42	1/2	1/3

样品	w （EMR）/%	w （熟石灰）/%	w （矿渣）/%	W/C	C/S
A0		4	96	1/2	1/3
A1	10	4	86	1/2	1/3
A2	30	4	66	1/2	1/3
A3	50	4	46	1/2	1/3
A4	10	6	84	1/2	1/3
A5	30	6	64	1/2	1/3
A6	50	6	44	1/2	1/3
A7	10	8	82	1/2	1/3
A8	30	8	62	1/2	1/3
A9	50	8	42	1/2	1/3

样品	w （EMR）/%	w （熟石灰）/%	w （矿渣）/%	W/C	C/S
A0		4	96	1/2	1/3
A1	10	4	86	1/2	1/3
A2	30	4	66	1/2	1/3
A3	50	4	46	1/2	1/3
A4	10	6	84	1/2	1/3
A5	30	6	64	1/2	1/3
A6	50	6	44	1/2	1/3
A7	10	8	82	1/2	1/3
A8	30	8	62	1/2	1/3
A9	50	8	42	1/2	1/3