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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (2): 263-271.doi: 10.11872/j.issn.1005-2518.2022.02.146

• 采选技术与矿山管理 • 上一篇    下一篇

混合粗骨料配比对充填体强度及浆体流动性能的影响规律

范永亮1(),崔继强1(),张元坤1,李凤2,3,黄春云1,顾元统1,2,何建元1   

  1. 1.金川集团股份有限公司龙首矿,甘肃 金昌 737100
    2.镍钴资源综合利用国家重点实验室,甘肃 金昌 737100
    3.金川镍钴研究设计院,甘肃 金昌 737100
  • 收稿日期:2021-10-11 修回日期:2021-12-12 出版日期:2022-04-30 发布日期:2022-06-17
  • 通讯作者: 崔继强 E-mail:1031698188@qq.com;1027241609@qq.com
  • 作者简介:范永亮(1986-),男,工程师,从事充填采矿工艺技术研究与管理工作。1031698188@qq.com
  • 基金资助:
    中国博士后基金面上项目“基于界面性能调控的粗骨料水泥基纤维充填体力学性能强化机理研究”(2021M693837);国家重点实验室开放基金项目“金川龙首矿掺纤维充填体的力学性能及贫矿资源高大进路结构参数优化研究”(GZSYS-KY-2020-013)

Influence of Mixed Coarse Aggregate Ratio on Strength and Fluidity of Filling Slurry

Yongliang FAN1(),Jiqiang CUI1(),Yuankun ZHANG1,Feng LI2,3,Chunyun HUANG1,Yuantong GU1,2,Jianyuan HE1   

  1. 1.Longshou Mine, Jinchuan Group Co. , Ltd. , Jinchang 737100, Gansu, China
    2.State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchang 737100, Gansu, China
    3.Nickel Cobalt Research and Design Institute of Jinchuan, Jinchang 737100, Gansu, China
  • Received:2021-10-11 Revised:2021-12-12 Online:2022-04-30 Published:2022-06-17
  • Contact: Jiqiang CUI E-mail:1031698188@qq.com;1027241609@qq.com

摘要:

为缓解金川龙首矿棒磨砂产量不足和充填成本上升带来的压力,提升充填体的稳定性,对金川龙首矿棒磨砂、废石混合粗骨料与固结粉的充填特性进行了研究。选择-5 mm棒磨砂和-12 mm废石混合新型固结粉作为充填材料,在灰砂比为1∶4的基础上,开展充填体强度测试和浆体流变性、流动性及泌水率试验,分析混合骨料配比对其充填综合性能的影响规律,从而提出最佳配比参数。结果表明:随着废石掺量的增加,充填体3 d强度出现略微下降,7 d和28 d强度呈现小幅增长的趋势;浆体屈服应力随废石掺量的增加而增大,黏度系数不断减小,当废石掺量小于35%时,浆体屈服应力均小于150 Pa;充填浆体塌落度和扩展度随废石掺量的增加而急剧减小,塌落度为27~29 cm,能够满足自流输送的要求;浆体泌水率为9%~12%,随着废石掺量的增加泌水率减少,有利于提升浆体的抗离析性;混合粗骨料中废石最佳掺量为30%,最佳质量浓度为82%~83%,在该参数条件下充填体各项指标均能满足金川龙首矿充填质量标准,对于提升矿区充填体稳定性和降低充填成本具有重要意义。

关键词: 混合粗骨料, 棒磨砂, 废石, 充填体强度, 流变参数, 泌水率, 龙首矿

Abstract:

The downword drift cemented filling method is an effective way for mining thick,broken,high-grade deposits in Jinchuan mining area.However,it not only has complicated process and high cost,but also requires high quality of filling body.In order to alleviate the pressure caused by insufficient rod milling sand production capacity and increase of produciton cost in Jinchuan mining area,and improve the comprehensive performance of filling body,the mechanical test of the filling body and the rheological properties,fluidity and bleeding rate test of the slurry were carried out,based on cement-sand ratio of 1∶4,using -5 mm rod mill sand,-12 mm waste rock as aggregate,the new consolidation powder as cementitious material.The influence of waste rock and rod milling sand ratio on the strength characteristics,fluidity,rheology and bleeding characteristics of filling body were studied,and the optimal ratio parameters were proposed. The results show that the 3 d strength of filling body decreases slightly,and the 7 d and 28 d strength increased slightly with the increase of the waste rock content.The yield stress of the slurry increase with the increase of waste rock content,and the viscosity coefficient decreases significantly.When the content of waste rock is less than 35%,the yield stress of slurry is less than 150 Pa.The slump and diffusivity degree decrease sharply with the increase of the waste rock content. The slump degree is generally between 27~29 cm,which can meet the requirements of gravity transportation.The bleeding rate of the slurry is 9%~12%.With the increase of waste rock content,the bleeding rate decreases,which is beneficial to improve the segregation resistance of the slurry.According to the test results,the optimal dosage of waste rock in the mixed coarse aggregate is 30%,and the optimal mass concentration is 82%~83%. Under the condition of these parameters,the indexes of filling body can meet the filling quality standard of Jinchuan mining area,which has great significance and application potential to improve the stability of filling body and reduce the cost of Jinchuan mining area.

Key words: mixed coarse aggregate, rod milling sand, waste rock, strength of filling body, rheological parameters, bleeding rate, Longshou mine

中图分类号: 

  • TD853

图1

充填骨料试样"

表1

充填骨料化学成分"

化合物名称废石中含量棒磨砂中含量
SiO236.3166.95
Al2O33.3912.50
CaO3.864.32
MgO28.151.88
Fe2O39.512.52
SO31.672.15
Na2O1.252.45
K2O1.652.35
其他14.214.88

图2

充填骨料粒径分布"

表2

充填试验方案设计"

试验编号废石∶棒磨砂灰砂比浆体质量浓度/%
S11∶91∶478
S21∶91∶480
S31∶91∶482
S42∶81∶478
S52∶81∶480
S62∶81∶482
S73∶71∶478
S83∶71∶480
S93∶71∶482
S104∶61∶478
S114∶61∶480
S124∶61∶482
S135∶51∶478
S145∶51∶480
S155∶51∶482

图3

废石掺量与充填体抗压强度的关系1.浆体质量浓度为78%;2.浆体质量浓度为80%;3.浆体质量浓度为82%;4.强度不足部分"

图4

不同质量浓度充填浆体剪切应力与剪切速率的关系"

表3

H-B流变模型拟合结果"

废石掺量/%质量浓度/%H-B流变模型R2
1082τ=12.08+7.50γ0.410.96
1084τ=33.08+4.53γ0.470.92
2080τ=39.48+2.96γ0.540.93
2082τ=43.81+1.68γ0.640.88
2084τ=51.53+1.83γ0.570.86
3078τ=34.94+0.50γ0.880.81
3080τ=42.03+2.86γ0.580.82
3082τ=76.21+0.27γ0.980.87
3084τ=112.71+0.65γ0.790.81
4078τ=57.79+0.16γ1.290.96
4080τ=76.32+1.05γ0.910.94
4082τ=191.33+0.09γ1.570.94
4084τ=208.19+3.63γ0.690.94

图5

废石掺量对充填浆体流变参数的影响"

图6

废石掺量与充填浆体流动性能参数的关系"

图7

废石掺量对粗骨料充填浆体泌水率的影响"

表4

推荐混合粗骨料充填体及浆体的性能参数"

参数名称数值参数名称数值
灰砂比1∶428 d强度/MPa6.02
废石/棒磨砂比值3∶7屈服应力/Pa76.21
浆体质量浓度/%82~83黏度系数/(Pa·s)0.27
3 d强度/MPa1.36塌落度/cm27.4
7 d强度/MPa3.98泌水率/%9.4
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