黄金科学技术 ›› 2022, Vol. 30 ›› Issue (2): 263-271.doi: 10.11872/j.issn.1005-2518.2022.02.146
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
Yongliang FAN1(),Jiqiang CUI1(),Yuankun ZHANG1,Feng LI2,3,Chunyun HUANG1,Yuantong GU1,2,Jianyuan HE1
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。
中图分类号:
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