某铅锌矿使用膏体充填中出现了缓凝现象,添加促凝剂后效果良好。为优化添加促凝剂条件下的膏体物料配比,开展了均匀设计实验。考察了膏体质量分数、砂灰比对泌水率、流动度、充填倍线、膏体强度的影响。实验结果表明,膏体的泌水率、流动度和充填倍线主要受质量分数影响,且均与浓度成负相关。砂灰比对流动度的影响很小,但其是膏体强度的主要影响因素,砂灰比越小,膏体的强度越大。综合考察泌水率、流动度、充填倍线、膏体强度4 种指标对应的配比范围,得出推荐配比为质量分数75%~76%、砂灰比7:1~8:1。
The retarding phenomenon appeared in the paste filling of a lead-zinc mine and it was ameliorated after adding coagulants. To optimize the paste material ratio under addition of coagulants, we carried out a uniform design experiment. The effects of paste concentration and sand-cement ratio on bleeding rate, fluidity, backfill gradient and paste strength were investigated. The results show that the paste bleeding rate, fluidity and backfill gradient were mainly influenced by concentration, and they were negatively correlated with the concentration. The sand-cement radio had a small impact on fluidity but a major impact on paste concentration. The smaller the sandcement ratio was, the larger the intensity of paste was. Based on the ratio ranges corresponding to the four indices of bleeding rate, fluidity, backfill gradient, and paste strength, the recommended ratio is 75% to 76% and the sand-cement ratio is 7:1 to 8:1.
[1] Henriquez J, Simms P. Dynamic imaging and modelling of multilayer deposition of gold paste tailings[J]. Minerals Engineering, 2009, 22(2): 128-139.
[2] 常庆粮, 周华强, 柏建彪. 膏体充填开采覆岩稳定性研究与实践[J]. 采矿与安全工程学报, 2011, 28(2): 279-282. Chang Qingliang, Zhou Huaqiang, Bai Jianbiao, et al. Stability study and practice of overlying strata with paste backfilling[J]. Journal of Min-ing and Safety Engineering, 2011, 28(2): 279-282.
[3] 翟永刚, 吴爱祥, 王洪江. 全尾砂膏体充填临界质量分数[J]. 北京科技大学学报, 2011, 33(7): 795-799. Zhai Yonggang, Wu Aixiang, Wang Hongjiang, et al. Threshold mass fraction of unclassified-tailings paste for backfill mining[J]. Journal of University of Science and Technology Beijing, 2011, 33(7): 795-799.
[4] Fall M, Célestin J, Sen H. Potential use of densified polymer-pastefill mixture as waste containment barrier materials[J]. Waste Management,2010, 30(12): 2570-2578.
[5] Sheng-hua Y, Ai-xiang W, Kai-jian H. The effect of solid components on the rheological and mechanical properties of cemented paste backfill [J]. Minerals Engineering, 2012, 35: 61-66.
[6] Nasir O, Fall M. Coupling binder hydration, temperature and compres-sive strength development of underground cemented paste backfill at early ages[J]. Tunneling and Underground Space Technology, 2010, 25 (1): 9-20.
[7] Reid C, Bécaert V, Aubertin M. Life cycle assessment of mine tailings management in Canada[J]. Journal of Cleaner Production, 2009, 17(4): 471-479.
[8] 李公成, 王洪江, 吴爱祥, 等. 基于倾斜管实验的膏体自流输送规律 [J]. 中国有色金属学报, 2014, 24(12): 3162-3164. Li Gongcheng, Wang Hongjiang, Wu Aixiang, et al. Gravity transport law of paste based on inclined pipe experiment[J]. The Chinese Journal of Nonferrous Metals, 2014, 24(12): 3162-3164.
[9] 尹建东, 宋军平. 硫化物促凝机理及其在膏体充填中的应用[J]. 现代矿业, 2015(1): 183-185. Yin Jiandong, Song Junping. Facilitate setting mechanism of sulfide and its application in paste backfill[J]. Modern Mining, 2015(1): 183-185.
[10] 王洪江, 王勇, 吴爱祥. 从饱和率和泌水率角度探讨膏体新定义[J]. 武汉理工大学学报, 2011, 33(6): 85-89. Wang Hongjiang, Wang Yong, Wu Aixiang, et al. Research of paste new definition from the viewpoint of saturation ratio and bleeding rate [J]. Journal of Wuhan University of Technology, 2011, 33(6): 85-89.
[11] 方开泰. 均匀设计与均匀设计表[M]. 北京: 科学出版社, 1994. Fang Kaitai. Uniform design and uniform design table[M]. Beijing: Sci-ence Press, 1994.
