分级细尾砂胶结充填强度和料浆流变性能试验研究

Experimental Study on Cemented Backfill Strength and Slurry Rheological Properties of Graded Fine Tailings

以某黄金矿山分级细尾砂为研究对象,在对充填材料基本物理化学性质检测分析的基础上,开展了强度试验和料浆流变特性试验。结果表明:新型胶凝材料固化分级细尾砂效果好,充填体早期强度较传统胶凝材料高,有利于缩短采矿周期。添加新型胶凝材料的分级细尾砂料浆流变曲线符合Herschel-Bulkley(H-B)流变模型,随尾砂浆浓度增加,料浆屈服应力呈指数增长,而塑性黏度缓慢增加;料浆屈服应力随新型胶凝材料掺量增加不断增大,塑性黏度则先增大后降低。

The graded fine tailings from a gold mine were taken for research. After the detection and analysis of the basic physical and chemical properties of backfill materials, tests on backfill body strength and the rheological properties of slurry were performed. The results show that the new cementitious material can bring in good solidification effect for the graded fine tailings, and the strength of the backfill body at the early stage is higher than that with the traditional cementitious materials, which can help to shorten the mining cycle. The rheological curve of the graded fine tailings slurry with the addition of new cementitious materials conforms to the Herschel-Bulkley(H-B) rheological model. With the increase of the tailings concentration, the yield stress of the slurry increases exponentially, while the plastic viscosity increases slowly. And with an increase in the addition amount of new cementitious materials, the yield stress of the slurry increases continuously, but the plastic viscosity decreases after an initial increase.