| 浓密增效剂对尾砂料浆浓密性能的影响及机理 |
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| 引用本文： | 周茜,刘娟红,吴爱祥,王洪江,付士峰,谷峪. 浓密增效剂对尾砂料浆浓密性能的影响及机理[J]. 工程科学学报, 2019, 41(11): 1405-1411. DOI: 10.13374/j.issn2095-9389.2019.01.16.002 |
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| 作者姓名： | 周茜 刘娟红 吴爱祥 王洪江 付士峰 谷峪 |
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| 作者单位： | 1.北京科技大学土木与资源工程学院，北京 100083 |
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| 基金项目： | 国家自然科学基金资助项目(51834001) |
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| 摘 要： | 针对膏体充填技术中添加絮凝剂对尾砂浓密后浓度提高有限，且屈服应力增大，流动性降低等问题，研究了絮凝剂?浓密增效剂共同作用，进一步提高全尾砂膏体充填料浆浓度，降低料浆屈服应力，并从微观角度进行机理分析. 结果表明:通过沉降与流变试验发现，最佳添加工艺为加入絮凝剂沉降完毕后再加入浓密增效剂，固相质量分数可提高8.57%～10.13%，同时屈服应力降低6.68～12.85 Pa；多组分浓密增效剂不仅能降低单耗与成本，还可以提高膏体充填材料的抗压强度；灰砂质量比1∶12并添加浓密增效剂的膏体充填材料28 d抗压强度为2.5 MPa，与灰砂质量比1∶6未添加浓密增效剂的膏体充填材料强度相差小于20%；通过总有机碳（TOC）吸附试验与Zeta电位试验发现，浓密增效剂具有吸附与分散的作用，会打开絮凝结构，释放絮团间水，从而提高尾砂浓度，并改善尾砂颗粒的流动性.
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| 关 键 词： | 膏体充填 料浆浓密 浓密增效剂 机理 吸附与分散 |
| 收稿时间： | 2019-01-16 |
Effect and mechanism of synergist on tailings slurry thickening performance |
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| Abstract: | The mine tailings generated from metallic ore not only occupies a large area of surface resources but also easily causes mud-rock flow and tailings dam failure. Moreover, the existence of a large number of underground voids threatens the safety of underground mining operations and can induce mines earthquake and surface subsidence. The paste filling technology involves thickening the mine tailings into paste and placing the paste in underground voids. The technology has been widely accepted and applied around the world for its advantages in safety, environmental protection, economy, and high efficiency. The dewatering of mine tailings is a prerequisite for the paste filling process. In the paste backfill, after tailings thickening, the concentration increase is limited, the yield stress is increased, and fluidity is reduced with flocculant dosage. The flocculant dosage and thickening synergist work together to further increase unclassified tailings paste concentration and reduce slurry yield stress. The mechanism of the thickening synergist was researched from a microscopic point of view. The results show that the best addition method is to add thickening synergist after tailings settlement with flocculant dosage by settlement and rheological test. The solid mass fraction can be increased by 8.57%?10.13%, and the yield stress can be reduced by 6.68?12.85 Pa. The multi-component thickening synergist can not only reduce unit consumption and cost but also improve the compressive strength of the paste backfill material. The compressive strength of paste backfill material with thickening synergist and cement-tailings mass ratio of 1∶12 is 2.5 MPa at the age of 28 d. The difference is less than 20% compared with the compressive strength of the material with cement-tailings mass ratio of 1∶6 and without thickening synergist. By total organic carbon adsorption test and Zeta potential test, the synergist is found to have functions of adsorption and dispersion. It can destroy the flocculation structure and release the contained water, thereby increasing the tailings concentration and improving the fluidity of tailings particles. |
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