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金属矿山 ›› 2021, Vol. 50 ›› Issue (07): 66-72.

• 采矿工程 • 上一篇    下一篇

掺石灰石粉的混合骨料充填料浆配比优化研究

何建元 温震江2  王永定1  王  虎1  高  谦李  海 李宏业1   

  1. 1. 金川集团股份有限公司,甘肃 金昌 737100;2.北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083
  • 出版日期:2021-07-15 发布日期:2021-08-06
  • 基金资助:
    “十三五”国家重点研发计划重点专项(编号:2017YFC0602903)

Study on Mix Proportion Optimization of Mixed Aggregate Filling Slurry with Limestone Powder

HE Jianyuan   WEN Zhenjiang   WANG Yongding   WANG Hu  GAO Qian2    LI Hai   LI Hongye1   

  1. 1. Jinchuan Group Co,Ltd.,Jinchang 737100,China;2. Key Laboratory of High Efficient Mining and Safety of Metal Mine,Ministry of Education,University of Science and Technology,Beijing 100083,China
  • Online:2021-07-15 Published:2021-08-06

摘要: 针对金川矿山采用的废石-棒磨砂混合粗骨料级配不良,导致充填料浆离析的问题,通过掺石灰石粉来改善骨料级配,进一步改善充填效果。对骨料进行了物化分析,在此基础上开展了混合骨料粒径级配 分析,并进行了掺石灰石粉混合骨料充填体强度试验和料浆管输特性试验;根据试验结果采用BP神经网络建立模型对充填体强度和料浆管输特性进行预测,并进行了混合骨料充填料浆配比优化。研究表明:掺入适量 的石灰石粉,不仅能有效改善粒径级配,提高充填体强度,而且能提高充填料浆流动性,对充填料浆管输特性有益,能明显改善充填效果;充填料浆优化配比为胶凝材料添加量310 kg/m3,石灰石粉掺量12.3%,料浆 质量浓度80%,经过工业充填时取样验证,其塌落度、稠度、泌水率以及3 d、7 d和28 d抗压强度分别为25.41 cm、9.31 cm、6.7%、2.7 MPa、5.1 MPa和10.6 MPa,均满足矿山工业充填的要求,并且单位充填成本较 原来降低了21%。

关键词: 充填开采, 石灰石粉, 混合骨料, 配比, 强度, 管输特性, 优化

Abstract: In view of the poor gradation of waste stone bar grit blended coarse aggregate in Jinchuan Mine, the problem of segregation of filling slurry is solved. Limestone aggregate is added to improve aggregate gradation and improve filling effect. Firstly, the physical and chemical analysis of the aggregate is carried out, and on this basis, the particle size distribution analysis of the mixed aggregate is carried out. Secondly, the strength test of the mixed aggregate filled with limestone powder and the pipe transportation characteristics of the slurry are carried out. Then, based on the test results, the BP neural network model is established to predict the strength of the filling body and the pipe transportation characteristics of the slurry,and the mix proportion of the mixed aggregate filling slurry is optimized. The study results show that: adding appropriate amount of limestone powder can not only effectively improve the particle size distribution and strength of the filling body, but also improve the fluidity of the filling slurry, which is beneficial to the pipeline transportation characteristics of the filling slurry, and can significantly improve the filling effect.The optimal proportion of the filling slurry is as follows: the amount of cementitious material is 310 kg/m3, the content of limestone powder is 12.3%, and the mass concentration of slurry is 80%.It has been verified by sampling during industrial filling that The slump, consistency, bleeding rate, 3 d, 7 d and 28 d compressive strength are 25.41 cm, 9.31 cm, 6.7%, 2.7 MPa, 5.1 MPa and 10.6 MPa respectively, which can meet the requirements of mine industrial filling, and the cost of unit filling is reduced by 21%.

Key words: filling mining, limestone powder, mixed aggregate, proportion, strength, pipeline transportation characteristics, optimization