分級細尾砂膠結充填體早期水化放熱及強度演化特性

寇云鵬; 郭沫川; 譚玉葉; 齊兆軍; 宋澤普; 宋衛東

doi:10.13374/j.issn2095-9389.2022.07.24.002

分級細尾砂膠結充填體早期水化放熱及強度演化特性

doi: 10.13374/j.issn2095-9389.2022.07.24.002

寇云鵬^{1, 2, 3},
郭沫川^{1, 2},
譚玉葉^{1, 2, ,},
齊兆軍³,
宋澤普³,
宋衛東^{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
3.
山東黃金礦業科技有限公司充填工程實驗室分公司，煙臺 261400

基金項目: 國家自然科學基金資助面上項目（52274110）；國家自然科學基金資助青年項目（52004019）；國家重點研發計劃資助項目（2022YFC2905003）；北京科技大學青年教師國際交流成長計劃資助項目（QNXM20220004）

詳細信息

通訊作者:
E-mail: tanyuye@ustb.edu.cn

中圖分類號: TD853
計量
- 文章訪問數: 560
- HTML全文瀏覽量: 265
- PDF下載量: 61
- 被引次數: 0
出版歷程
- 收稿日期: 2022-07-24
- 網絡出版日期: 2022-11-22
- 刊出日期: 2023-08-25

Early hydration heat release and strength evolution of cemented backfill with graded fine tailings

KOU Yun-peng^{1, 2, 3},
GUO Mo-chuan^{1, 2},
TAN Yu-ye^{1, 2
, ,},
QI Zhao-jun³,
SONG Ze-pu³,
SONG Wei-dong^{1, 2}

1.
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
3.
Backfill Engineering Laboratory Branch, Shandong Gold Technology Co., Ltd, Yantai 261400, China

More Information

Corresponding author: E-mail: tanyuye@ustb.edu.cn

摘要

摘要: 對分級細尾砂膠結充填體的早期水化反應及力學演化特性進行研究，對不同灰砂比充填體料漿進行水化放熱及電阻特性測試，并根據掃描電子顯微鏡對早期水化產物進行微觀形貌特征分析，最后在單軸壓縮力學試驗結果的基礎上，分析早期水化反應進程及產物對充填體強度演化的影響。研究表明，灰砂比越大，水化放熱速率及放熱量越大，生成水化產物越多，體積電阻率越大。同時水化反應速率直接決定了充填體自身強度形成的快慢，生成的Ca(OH)₂減小了料漿體積電阻率，加快充填體自身強度的增長；隨后生成的鈣礬石（Aft）導致顆粒間孔隙更加致密，抑制了離子的溶解，減緩放出熱量速率，從而阻礙了充填體強度的增長；當水化反應進行14 d基本結束后，充填材料凝結固化成為一個整體，強度基本穩定。充填體強度的變化呈現先迅速增加隨后增加趨勢逐漸減小直至穩定的趨勢，為礦山采用分級細尾砂進行井下采空區充填、控制深部采場溫度提供理論支撐及科學指導。
- 分級細尾砂 /
- 充填體 /
- 早期 /
- 水化放熱 /
- 電阻率 /
- 強度演化
Abstract: In this work, the early hydration reaction and mechanical evolution characteristics of graded fine tailing cemented backfill are studied. The hydration exothermicity and electrical resistance characteristics of backfill slurry with different lime sand ratios are tested, and the microscopic morphology characteristics of early hydration products are analyzed according to scanning electron microscopy (SEM). Finally, on the basis of uniaxial compression mechanical test results, the early hydration reaction process and the effect of the products on the strength evolution of the backfill are analyzed. The results showed that the exothermic process of slurry hydration underwent rapid reaction stage I, induction stage II, acceleration stage III, deceleration stage IV, and stabilization stage V. The volume resistivity underwent increasing stage I, decreasing stage II, and accelerated increasing stages III. The slurry lime sand ratio affects the hydration heat release and volume resistivity. The larger ratio is, the greater the hydration heat release rate and heat release, the more hydration products are generated, and the greater the volume resistivity. An increase in the lime sand ratio prolongs the induction time of the hydration reaction and increases the rate of the hydration reaction during the induction period. At the same time, it retards the growth of volume resistivity. The larger the lime sand ratio is, the stronger the retarding effect and the larger the retarding effect on the growth of slurry volume resistivity. The rate of the hydration reaction directly determines the formation speed of the backfill strength. When the main components of the filling material, C₃S and C₃A, are dissolved rapidly in water, much heat is released. The generated Ca(OH)₂ reduces the volume resistivity of the slurry and accelerates the growth of the backfill strength; the AFt generated subsequently compacts the pores between particles, blocks the dissolution of ions, decreases the rate of heat release, and prevents the growth of backfill strength. The backfill strength increases rapidly from 0–3 d and slowly from 3–7 d. When the hydration reaction is basically completed after 14 d, the filling material is solidified overall, and its strength is basically stable. The change in backfill strength first increases and then gradually decreases until stabilizing. These research conclusions provide theoretical support and scientific guidance for mining to adopt graded fine tailings to fill the underground goaf and control the temperature of the deep stope.
- graded fine tailings /
- fillings /
- early stage /
- hydration exothermic /
- resistivity /
- strength evolution

HTML全文

圖 1 尾砂粒徑分布圖. (a) 全尾砂; (b) 分級細尾砂

Figure 1. Distribution of the grain diameter of tailings: (a) full tailings; (b) graded fine tailings

下載: 全尺寸圖片幻燈片

圖 2 充填材料XRD物相分析. (a) 分級細尾砂; (b) 充填C料

Figure 2. XRD phase analysis of filling materials: (a) graded fine tailings; (b) filling C material

下載: 全尺寸圖片幻燈片

圖 3 試樣充填料漿早期水化放熱速率曲線. (a)水化全過程放熱速率; (b)快速反應階段I; (c)誘導階段II; (d)加速階段III; (e)減速階段IV; (f)穩定階段V

Figure 3. Hydration heat release rate of filling slurry of sample: (a) heat release rate of the entire hydration process; (b) rapid response stage I; (c) induction stage II; (d) acceleration stage III; (e) deceleration stage IV; (f) stable stage V

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圖 4 試樣充填料漿早期水化放熱曲線. (a)放熱曲線; (b)快速反應階段I; (c)誘導階段II; (d)加速階段III

Figure 4. Early hydration heat release curve of filling slurry of sample: (a) exothermic curve; (b) rapid response stage I; (c) induction stage II; (d) acceleration stage III

下載: 全尺寸圖片幻燈片

圖 5 充填料漿早期水化過程體積電阻率隨時間變化曲線

Figure 5. Variation curve of volume resistivity with time during hydration

下載: 全尺寸圖片幻燈片

圖 6 水化反應速率與體積電阻率隨時間變化曲線

Figure 6. Relationship between time and the hydration reaction rate and volume resistivity

下載: 全尺寸圖片幻燈片

圖 7 灰砂比為1∶4的充填料漿水化產物不同時間下的XRD分析

Figure 7. XRD pattern of hydration products of filling slurry with cement sand ratio of 1∶4 at different time

下載: 全尺寸圖片幻燈片

圖 8 不同養護時間超細尾砂充填材料的SEM圖. （a） 3 d；（b）7 d；（c）14 d

Figure 8. SEM image of ultra-fine tailing filling material with different curing times: (a) 3 d; (b) 7 d; (c) 14 d

下載: 全尺寸圖片幻燈片

圖 9 各組試件單軸抗壓強度分布及強度擬合曲線

Figure 9. Uniaxial compressive strength distribution diagram and strength fitting curve of each group of test pieces

下載: 全尺寸圖片幻燈片

圖 10 累計放熱量與單軸抗壓強度隨時間變化曲線

Figure 10. Variation curve of cumulative heat release and uniaxial compressive strength with time

下載: 全尺寸圖片幻燈片

圖 11 單軸抗壓強度演化階段

Figure 11. Classification of evolution stages of uniaxial compressive strength

下載: 全尺寸圖片幻燈片

表 1 分級細尾砂XRF化學成分分析（質量分數）

Table 1. XRF chemical composition analysis of fine tailings %

SiO₂	Al₂O₃	CaO	Fe₂O₃	K₂O	MgO	Na₂O	TiO₂
61.754	12.689	9.1819	5.9527	4.4368	3.3046	1.2438	0.6499

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表 2 充填C料XRF化學成分分析（質量分數）

Table 2. XRF chemical composition analysis of filling C material %

CaO	SiO₂	Al₂O₃	MgO	SO₃	Fe₂O₃	Na₂O	TiO₂
44.57	29.95	10.09	6.639	5.295	1.251	0.722	0.6499

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表 3 試樣參數及用量

Table 3. Sample parameters and dosage

No.	Cement–sand ratio	Raw material consumption
No.	Cement–sand ratio	Filling material C / g	Graded fine tailings / g	Water / mL
S1	Pure filling material C	2.7315	0	1.5082
S2	1∶4	0.5463	2.1852	1.5082
S3	1∶6	0.3902	2.3413	1.5082
S4	1∶8	0.3035	2.4280	1.5082

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表 4 充填料漿早期水化放熱各階段放熱數據表

Table 4. Heat release and heat release rate at each stage of hydration heat release

No.	Duration time/h				Exothermic/ (J^–1·g^–1)				Average heat release rate / (J·g^–1·h^–1)
No.	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅰ	Ⅱ	Ⅲ	Ⅳ
S1	0.29	2.51	13.18	156.21	9.62	6.64	53.74	283.04	33.17	2.65	4.08	1.81
S2	0.22	2.25	29.94	139.77	3.74	2.03	61.33	44.37	19.39	1.01	1.74	0.39
S3	0.18	1.73	20.25	150.02	3.49	1.74	35.17	59.02	17.01	0.91	2.05	0.32
S4	0.14	1.70	15.99	154.35	2.15	0.95	15.53	31.17	15.36	0.56	0.97	0.21

下載: 導出CSV

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