全尾砂戈壁集料膏体凝结性与流动性研究

以某矿戈壁集料为粗骨料的充填膏体为试验料浆，采用正交设计法设计试验方案，研究质量浓度、灰砂比、尾砂与戈壁集料比及泵送剂添加量对抗压强度和塌落度的影响规律。对试验结果运用极差分析和多元回归分析方法分析。结果表明：灰砂比对膏体抗压强度的影响最大，各因素对塌落度的影响基本相当。根据矿山强度要求，假底充填配比应为：浓度77%~78%，尾砂与戈壁集料比2.5~3.5，灰砂比0.16~0.17，泵送剂添加量为1.5%~2.0%；打顶充填配比为：浓度77%~78%，尾砂与戈壁集料比3~4，灰砂比0.09~0.11，泵送剂添加量为1.5%~2.0%。

Study on Coagulability and Fluidity of Unclassified Tailings Paste with Gobi Aggregates

Taking the coarse aggregate paste with gobi aggregates as the experimental slurry，the orthogonal design method was adopted to design the experimental scheme to study the influencing rules of mass concentration，cement-sand ratio，tailing-aggregate ratio and the addition of pumping agent to the compressive strength and the collapsed slump. Test results are analyzed by the range analysis and the multiple regression analysis method. The results showed that the cement-sand ratio has the greatest influence on compressive strength of the paste and these factors have the similar influence on the collapsed slump. According to the requirement of strength from the mine，the filling ratio of false bottom should be that the concentration ranges from 77 % to 78 %，the tailing/gobi aggregate ratio is from 2.5 to 3.5，the cement-sand ratio is from 0.16 to 0.17，and the addition of pumping aid is from 1.5% to 2.0%; the filling ratio of false roof should be that the concentration is from 77% to 78%，the tailing/gobi aggregate ratio is from3.0 to 4.0，the cement-sand ratio is from 0.09 to 0.11，and the addition of pumping aid is from 1.5% to 2.0%.