基于超級絮凝的超細尾砂絮凝行為優化

吳愛祥; 阮竹恩; 王建棟; 尹升華; 艾純明

doi:10.13374/j.issn2095-9389.2019.08.003

基于超級絮凝的超細尾砂絮凝行為優化

doi: 10.13374/j.issn2095-9389.2019.08.003

吳愛祥^{1, 2},
阮竹恩^{1, 2, ,},
王建棟^{1, 2},
尹升華^{1, 2},
艾純明^{1, 3}

1.
北京科技大學金屬礦山高效開采與安全教育部重點實驗室, 北京 100083
2.
北京科技大學土木與資源工程學院, 北京 100083
3.
遼寧工程技術大學安全科學與工程學院, 葫蘆島 125105

基金項目:

國家自然科學基金重點資助項目 51834001

國家自然科學基金重點資助項目 51804015

國家重點研發計劃資助項目 2017YFC0602903

金屬礦山高效開采與安全教育部重點實驗室開放基金資助項目 ustbmslab201806

詳細信息

通訊作者:
阮竹恩, E-mail: ziyuan0902rze@163.com

中圖分類號: TD853
計量
- 文章訪問數: 1301
- HTML全文瀏覽量: 520
- PDF下載量: 40
- 被引次數: 0
出版歷程
- 收稿日期: 2019-02-22
- 刊出日期: 2019-08-01

Optimizing the flocculation behavior of ultrafine tailings by ultra-flocculation

WU Ai-xiang^{1, 2},
RUAN Zhu-en^{1, 2
, ,},
WANG Jian-dong^{1, 2},
YIN Sheng-hua^{1, 2},
AI Chun-ming^{1, 3}

1.
Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
2.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
3.
College of Safety Science and Engineering, Liaoning Technical University, Huludao 125105, China

More Information

Corresponding author: RUAN Zhu-en, E-mail: ziyuan0902rze@163.com

摘要

摘要: 為了研究不同絮凝條件下超細尾砂的絮凝效果, 本文基于超級絮凝理論, 應用超級絮凝測試儀UFT-ТFS-029, 采用相對絮凝率表征人造超細尾砂在pH值為9~12、絮凝劑單耗f_d=2~20 g·t^-1、料漿剪切速率γ=100~2000 s^-1、料漿固體體積分數φ=2%~14%等條件下的絮凝行為. 發現相對絮凝率隨著pH、絮凝劑單耗、剪切速率的增加均先增加后減少, 而隨著漿料固體體積分數的增加逐漸減少, 并獲得了一定條件下的最優絮凝條件, 即pH值為11、f_d=12 g·t^-1、γ=500 s^-1、φ=4%. 同時, 固體體積分數越高, 達到最優相對絮凝率所需的最優剪切速率對固體體積分數的依賴性也越高. 因此, 在實際生產中需要對pH、絮凝劑單耗、剪切速率與固體體積分數等工況參數進行調整, 以達到最優絮凝效果. 應用超級絮凝理論可實現超細尾砂在極短時間內實現很好的絮凝, 為基于流場剪切速率與停留時間的深錐濃密機進料井設計提供參考.
- 超細尾砂 /
- 陰離子聚丙烯酰胺 /
- 超級絮凝 /
- 剪切速率 /
- 絮凝行為優化
Abstract: With the continuous pursuit of mineral resources and the development of mineral processing technology, ore is being ground more and more finely, which has resulted in large volumes of ultrafine tailings. However, ultrafine tailings are more difficult to separate from water than coarse tailings, which also makes the safe and efficient disposal of these tailings difficult. Normally, flocculation is an essential part of solid-liquid separation to improve the settling rate, and a polymer flocculant is widely used in treating ultrafine tailings. To study the influence of flocculation conditions on the flocculation effect, ultra-flocculation theory and the UltraflocTester UFT-TFS-029 were used. The relative flocculation rate was applied to characterize the flocculation behavior of artificial ultrafine tailings under the conditions of pH 9-12, flocculant dosage f_d=2 g·t^-1-20 g·t^-1, shear rate γ=100 s^-1-2000 s^-1, and solid volume fraction φ=2%-14%. The results indicate that the flocculation rate increases first and then decreases with pH, flocculant dosage, and shear rate. However, this rate decreases gradually with an increase in the solid volume fraction. The optimal flocculation conditions are: pH 11, f_d=12 g·t^-1, γ=500 s^-1, and φ=4%. Also, to achieve the optimal flocculation rate, the dependence of the optimal shear rate on the solid volume fraction also increases with the solid volume fraction. Therefore, it is necessary to adjust the operating parameters such as pH, flocculant dosage, shear rate, and solid volume fraction to achieve optimal flocculation. A satisfactory flocculation rate of ultrafine tailings is easily achieved in a very short time using the ultra-flocculation theory, which provides a reference for the design of feed wells based on shear rate and residence time.
- ultrafine tailings /
- anionic polyacrylamide /
- ultra-flocculation /
- shear rate /
- flocculation behavior optimization

HTML全文

圖 1 人造尾砂化學組成

Figure 1. Chemical composition of artificial tailings

下載: 全尺寸圖片幻燈片

圖 2 人造尾砂粒徑分布

Figure 2. Grain size distribution of artificial tailings

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圖 3 UFT-ТFS-029超級絮凝測試儀. (a) 實物照片; (b) 原理圖

Figure 3. UltraflocTester UFT-ТFS-029: (a) photograph; (b) schematic diagram

下載: 全尺寸圖片幻燈片

圖 4 不同pH條件下的相對絮凝率、上清液濁度與Zeta電位

Figure 4. Flocculation rate, turbidity, and Zeta potential at different pH values

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圖 5 不同絮凝劑單耗條件下剪切速率對相對絮凝率的影響

Figure 5. Effect of shear rate on flocculation rate for different flocculant dosages

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圖 6 剪切速率對相對絮凝率的影響機理

Figure 6. Effect of shear rate on flocculation rate

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圖 7 絮凝劑單耗對相對絮凝率的影響機理

Figure 7. Effect of flocculant dosage on flocculation rate

下載: 全尺寸圖片幻燈片

圖 8 不同固體體積分數的最優剪切速率與最優相對絮凝率

Figure 8. Optimal shear rate and flocculation rate versus solid volume fraction

下載: 全尺寸圖片幻燈片

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