典型硫酸盐固废复合胶凝材料制备与微观特性研究

doi:10.19964/j.issn.1006-4990.2023-0354

Abstract

Abstract:

The environmental pollution and resource waste caused by sulfate industrial solid wastes have attracted widespread attention from scholars at home and abroad.At present，two typical sulfate solid wastes in China，electrolytic manganese slag and phosphogypsum，have huge stockpiles and cause serious environmental pollution，so it is urgent to realize their harmless and resourceful utilization.Based on the characteristics of two kinds of solid wastes，electrolytic manganese slag and phosphogypsum were used to prepare composite cementitious materials by combining slag with electrolytic manganese slag and phosphogypsum，and the effects of different blending amounts of phosphogypsum and ordinary silicate cement on the mechanical properties of the composite cementitious materials were investigated.The physical composition and microscopic morphological changes of the hardened body were analyzed by XRD，SEM and EDS，and the toxicity leaching test was also conducted on the hardened body.The results showed that the strength of the hardened body at each age was increased with the increase of cement dosing，and the strength of the hardened body at each age was decreased with the increase of phosphogypsum dosing.The 28 d compressive strength of the composite cementitious materials with the ratio of 50% electrolytic manganese slag，20% phosphogypsum，30% slag and 12% cement admixture could reach 27.1 MPa，and the hydration products of sulfate solid waste composite cementitious materials were mainly hydrated calcium silicate（C-S-H） gel and calcium alumina（AFt）.The concentration of soluble Mn²⁺，NH₄⁺-N，PO $4 3 -$ and heavy metal ions in the leachate of the hardened body maintained to 28 d met the discharge requirements of GB 8978—1996“Comprehensive Wastewater Discharge Standards”after stabilization.

Key words: sulfate solid waste, composite cementitious materials, mechanical properties, hydration hardening, toxic leaching

CLC Number:

TQ177

YU Zhou, HE Zhaoyi, TANG Liang, HE Sheng, XIAO Haixin, XIAO Yixun. Study on preparation and microscopic properties of typical sulfate solid waste composite cementitious materials[J]. Inorganic Chemicals Industry, 2024, 56(4): 90-97.

Figures/Tables 9

Fig.1

Table 1

Fig.2

Table 2

Fig.3

Fig.4

Fig.5

Fig.6

Table 3

Leaching toxicity results of hardened body specimens"

组别	浸出毒性/（mg·L^-1）
组别	Mn²⁺	NH₄⁺-N	PO $4 3 -$	Hg²⁺	Pb²⁺	Cd²⁺	Cr⁶⁺	Cu²⁺	Zn²⁺	Ba²⁺	Ni²⁺
原始电解锰渣	1 220	149	0.001 2	0.001 2	0.013 2	0.073 2	0.025 2	0.464	1.7	0.498	0.974
原始磷石膏	—	—	300.27	0.013	0.012	0.004	0.079	0.456	0.201	0.143	0.486
A1B1	0.755 5	3.482	0.007 8	0.000 7	0.018 8	0.054 3	0.000 5	0.315	0.633	0.334	0.358
A1B2	0.378 4	1.925	0.004 5	0.000 51	0.009 5	0.042 4	0.000 3	0.268	0.571	0.317	0.254
A1B3	0.088 4	0.079 9	0.003 2	0.000 22	0.001 4	0.014 6	0.000 2	0.121	0.248	0.189	0.199
GB 8978—1996 I类限值	2	15	0.5	0.05	1	0.1	0.5	0.5	2	—	1

Table 3

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原料	w（SiO₂）	w（Al₂O₃）	w（Fe₂O₃）	w（CaO）	w（SO₃）	w（MgO）	w（Na₂O）	w（K₂O）	w（MnO）	w（P₂O₅）	w（其他）
电解锰渣	38.55	7.78	6.58	9.34	27.32	2.34	0.78	3.01	3.11	—	1.2
磷石膏	4.87	0.88	1.25	52.20	39.02	0.17	0.26	0.13	—	0.86	0.36
矿渣	32.49	19.22	0.52	35.28	1.62	8.76	0.61	0.40	0.19	—	1.1
水泥	19.88	5.22	2.75	65.66	3.47	0.49	—	—	—	—	1.59

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Study on preparation and microscopic properties of typical sulfate solid waste composite cementitious materials

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编号	w（电解锰渣）/%	w（磷石膏）/%	w （矿渣）/%	水泥外掺量/%	水胶比
A1B1	50	20	30	8	0.4
A2B1	45	25	30	8	0.4
A3B1	40	30	30	8	0.4
A1B2	50	20	30	10	0.4
A2B2	45	25	30	10	0.4
A3B2	40	30	30	10	0.4
A1B3	50	20	30	12	0.4
A2B3	45	25	30	12	0.4
A3B3	40	30	30	12	0.4