堿激發水泥?磷渣固化性能及與含硫尾砂的相容性

姜關照; 吳愛祥; 王貽明

doi:10.13374/j.issn2095-9389.2019.12.19.002

堿激發水泥?磷渣固化性能及與含硫尾砂的相容性

doi: 10.13374/j.issn2095-9389.2019.12.19.002

姜關照^{1, 2},
吳愛祥^{1, 2},
王貽明^{1, 2, ,}

1.
北京科技大學土木與資源工程學院，北京 100083
2.
金屬礦山高效開采與安全教育部重點實驗室，北京 100083

基金項目: 國家自然科學基金資助項目(51674012)；國家重點研發計劃資助項目(2017YFC0602903)

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通訊作者:
E-mail：ustbwym@126.com

中圖分類號: TD853
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出版歷程
- 收稿日期: 2019-12-19
- 刊出日期: 2020-09-11

Curing performance of alkali-activated cement–phosphorous slag and its compatibility with sulfur tailings

JIANG Guan-zhao^{1, 2},
WU Ai-xiang^{1, 2},
WANG Yi-ming^{1, 2
, ,}

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Key Laboratory of Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, Beijing 100083, China

More Information

Corresponding author: E-mail: ustbwym@126.com

摘要

摘要: 基于磷渣材料水化特性和礦山充填應用條件，研究堿激發水泥?磷渣共同作為膠凝材料（CPCM）膠結含硫尾砂的可行性。選取生石灰、NaOH、Na₂SiO₃作為激發劑，開展CPCM固化性能試驗，并評價CPCM與含硫尾砂相容性。研究結果表明：磷渣摻量為水泥的100%、生石灰為3%時，CPCM終凝時間300 min，28 d抗壓強度40.6 MPa，基本可等量替代P.O 42.5水泥應用于礦山嗣后充填。Na₂SiO₃摻量4%時，CPCM終凝時間比水泥縮短39.3%，7 d強度提高31.1%。與水泥相比，CPCM使充填體凝結時間縮短8 h左右，且固化28 d后強度未出現劣化，表明CPCM與含硫尾砂相容性好。X射線衍射、掃描電鏡和電子能譜分析表明，CPCM水化產物主要為Ca(OH)₂和C?S?H。磷渣不斷水化，導致Ca(OH)₂含量下降，逐漸形成致密的低Ca/Si摩爾比C?S?H，這不僅保證了CPCM后期強度增加，而且避免了充填體強度劣化。
- 磷渣 /
- 堿激發劑 /
- 早期活性 /
- 含硫尾砂 /
- 礦山充填
Abstract: Phosphorus slag (PS) is an industrial waste discharged during the refining of yellow phosphorus by a high-temperature electric furnace. The slag is generally deposited on the surface in situ, and this uses up considerable areas of land and causes environmental pollution problems. The glass phase content in electric furnace PS is over 90%, indicating that the PS has potential cementitious property. As a cement admixture, PS has a retarding effect on cement, thus, its application to cement has become less adopted. Based on the hydration characteristics of PS and the application conditions of mine filling, the feasibility of alkali-activated cement–PS used as cementitious material (CPCM) to cement sulfur tailings was studied. Quicklime, NaOH, and Na₂SiO₃ were used as the activators to investigate the CPCM curing performance in a laboratory, and the compatibility of CPCM with sulfur tailings was evaluated. The results show that when the PS-to-cement mole ratio is 1∶1, quicklime is 3% of PS, the final setting time of CPCM is 300 min, and the CPCM strength for 28 days is 40.6 MPa, indicating that the material can replace P.O 42.5 cement in the subsequent filling process. When the Na₂SiO₃ is 4% of PS, the final setting time of CPCM is 39.3% less than that of cement, and its strength for 7 days is 31.1% higher than that of cement. Compared with cement, CPCM shortens the setting time of backfill by 8 hours, and its strength does not deteriorate after curing for 28 days. Therefore, CPCM is suitable for cementing sulfur tailings. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) analyses show that the CPCM hydration products are mainly Ca(OH)₂ and C?S?H. Moreover, the PS hydration resulted in a decrease in the Ca(OH)₂ content, and a compact C?S?H gel with a low Ca/Si mole ratio is formed. This not only improves the later strength of CPCM but also prevents the strength deterioration of the backfill.
- phosphorus slag /
- alkali activators /
- early activity /
- sulfur tailings /
- mine filling

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圖 1 磷渣X射線衍射圖譜

Figure 1. XRD pattern of phosphorus slag (PS)

下載: 全尺寸圖片幻燈片

圖 2 磷渣和全尾砂粒徑分布

Figure 2. Particle size distribution of PS and tailings

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圖 3 磷渣摻量對CPCM固化性能影響。（a）凝結時間；（b）抗壓強度

Figure 3. Effect of PS mass fraction on the cementitious material (CPCM) hardening properties: (a) setting time; (b) strength

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圖 4 生石灰摻量對CPCM固化性能影響。（a）凝結時間；（b）抗壓強度

Figure 4. Effect of quicklime mass fraction on the CPCM hardening properties: (a) setting time; (b) strength

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圖 5 NaOH摻量對CPCM固化性能影響。（a）凝結時間；（b）抗壓強度

Figure 5. Effect of NaOH mass fraction on the CPCM hardening properties: (a) setting time; (b) strength

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圖 6 Na₂SiO₃摻量對CPCM固化性能影響。（a）凝結時間；（b）抗壓強度

Figure 6. Effect of Na₂SiO₃ mass fraction on the CPCM hardening properties: (a) setting time; (b) strength

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圖 7 CPCM類型對CPTB固化性能影響。（a）凝結時間；（b）抗壓強度

Figure 7. Effect of CPCM type on the CPTB hardening properties: (a) setting time; (b) strength

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圖 8 水化產物X射線衍射圖譜。（a）CPCM；（b）CPTB

Figure 8. XRD patterns of hydration products: (a) CPCM; (b) CPTB

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圖 9 水化產物掃描電鏡圖。（a）CPD-28 d；（b）DL3-28 d；（c）DN4-7 d；（d）CPTB-1#-90 d；（e）CPTB-2#-90 d；（f）CPTB-3#-90d

Figure 9. SEM images of hydration products: (a) CPD-28 d; (b) DL3-28 d; (c) DN4-7 d; (d) CPTB-1#-90 d; (e) CPTB-2#-90 d; (f) CPTB-3#-90d

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圖 10 圖9所標各處水化產物電子圖譜。（a）A處；（b）B處；（c）C處

Figure 10. EDS spectra of hydration products of the marked areas in Fig. 9: (a) A; (b) B; (c) C

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圖 11 50個監測點Ca/Si比。（a）B處；（b）C處

Figure 11. Ca/Si ratio of 50 points: (a) B; (b) C

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表 1 水泥、全尾砂和磷渣化學成分

Table 1. Chemical compositions of cement, tailings, and phosphorus slag

Raw materials	Mass fraction/%
Raw materials	CaO	SiO₂	Al₂O₃	P₂O₅	Fe₂O₃	MgO
Cement	62.35	20.18	5.22	0.48	3.27	2.16
Tailings	6.95	17.26	10.03	—	16.34	0.18
Phosphorus slag (PS)	43.18	37.37	5.78	3.93	0.25	2.57

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表 2 CPCM配合比設計

Table 2. Design of CPCM mix ratio

Name of mix ratio	Mass fraction of phosphorus slag /%	Mass fraction of activators /%	Type of activators
CPO	0	0	Pure cement paste
CPA	25	0
CPB	50
CPC	75
CPD	100
DL3	100	3	Quicklime
DL6		6
DL9		9
DH2	100	2	NaOH (by Na₂O mass fraction)
DH4		4
DH6		6
DN2	100	2	Na₂SiO₃ (by Na₂O mass fraction)
DN4		4
DN6		6

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表 3 CPTB配合比設計

Table 3. Design of CPTB mix ratio

Name of filing body	Type of binders	Mass fraction of paste/%	Binder sand ratio
CPTB?1#	CPO	76	1∶12
CPTB?2#	DL3	76	1∶12
CPTB?3#	DN4	76	1∶12

下載: 導出CSV

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