深井长距离大倍线高浓度自流充填技术研究

新城金矿井下采用"竖井+辅助斜坡道"联合开拓方式,机械化盘区上向分层充填采矿法回采。目前,井下生产规模达到6 000 t/d。矿山深部充填采矿存在充填管线长、局部充填倍线高达12.5,且管路直角弯多,管路磨损严重,监护困难,充填过程中堵管以及跑漏等难题。通过深入研究新城金矿充填倍线、充填浓度以及充填流量三者关系,进一步优化充填线路,研究比较充填管材性能,合理选择充填管道,降低管路阻抗。结果表明:在砂仓添加Minefill309,在副桶内添加Minefill501新型化学试剂改善砂浆流动特性,充填浓度稳定在75%~78%之间,实现了稳定自流输送,防止了充填料浆离析,减少了管路磨损,管路使用寿命延长1倍以上,经济效益可观。新城金矿深井长距离大倍线高浓度自流充填技术填补了相关领域技术空白。

Study on the High-density Gravity-flow Backfilling Technology of Deep-well Long-distance with Large Time Line

Xincheng Gold Mine employ the shaft and auxiliary ramp development mode，and mechanized panel upward backfill mining.At present，the scale of production reaches 6 000 t/d.Many problems exit in the deep-well backfill mining of Xincheng Gold Mine ，including long backfilling pipeline，partial filling times line up to 12.5，many pipeline quarter turns，serious pipe wear out，difficult guardianship，pipe blockage and mortar leakage in the backfilling process.Through the study of the relationship of filling times line，backfilling density and backfilling flux of Xincheng Gold Mine，we optimize the backfilling line；backfilling pipeline performance was studied comparatively and the backfilling pipe was choosed reasonably to reduce the pipeline impedance；through experimental research，Minefill309 was added in storehouse，and a new chemical reagent Minefill501 was added in vice bucket to improve mortar flow characteristics，which could prevent slurry segregation，reduce pipeline abrasion， increase service life of pipeline more than doubled，and achieve considerable economic benefit.The filling concentration is stable between 75%～78%.The technology fills in the blank of theory and practice of the high-density gravity-flow backfilling，which can provide promotion and guidance for the industries at home and abroad.