| 北洺河铁矿全尾砂絮凝沉降实验研究 |
| 投稿时间：2021-04-29 修订日期：2021-12-15 点此下载全文 |
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| 基金项目:国家重点研发计划资助(编号2018YFC0808403) |
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| 中文摘要:针对北洺河铁矿选厂尾砂浆浓度较低，通过自然沉降难以满足地表塌陷区尾砂固结堆排对浓度的要求，需对全尾砂浆进行絮凝沉降浓缩，本研究以质量浓度为38%的尾砂浆和9类不同类型絮凝剂为原料进行静态絮凝沉降试验，探究絮凝剂种类及其单耗对全尾砂浆絮凝沉降的影响，筛选出适合该矿尾砂沉降的最佳絮凝剂类型及其单耗。研究结果表明：当添加浓度为1‰絮凝剂溶液时，不同种类的絮凝剂对尾砂浆沉降速度都有促进作用，其中分子量为1200万的阴离子聚丙烯酰胺絮凝剂（APAM）其絮凝效果最好，且其对应最佳絮凝剂单耗为40g/t，能在最短时间内将尾砂提高至所需浓度46%，可以满足塌陷区尾砂固结堆排技术对絮凝沉降浓度的要求。 |
| 中文关键词:全尾砂 尾砂浆浓缩 静态沉降试验 絮凝剂 絮凝剂单耗 |
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| Experimental Study on Flocculation and Settlement of Unclassified Tailings in Beiminghe Iron Mine |
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| Abstract:The unclassified tailings slurry is emitted with low mass concentration in Beiminghe Iron Mine. However, it is generally difficult to meet the concentration requirements of tailings consolidation piles in the surface subsidence areas through the method of natural settlement. Therefore, the unclassified tailings slurry needs to be further flocculated and concentrated by adding flocculants. In this study, the unclassified tailings slurry with a mass concentration of 38 % and nine types of flocculants were chosen as experimental materials. and the static flocculation and sedimentation tests were conducted to investigate the effect of flocculants types and dosages on the flocculation and sedimentation property of the unclassified tailings slurry. Moreover, the optimal flocculant types and its dosage were determined by analyzing the settlement time, sedimentation velocity, and mass concentration of slurry after settlement. The experimental results show that compared with the slurry by natural settlement, adding the concentration of 1‰ flocculants solution have promoting effect on the sedimentation velocity of the unclassified tailings slurry, and the anionic polyacrylamide flocculant (APAM) with a molecular weight 12 million has the best flocculation effect. And its corresponding optimal flocculant unit consumption is 40g/t, which can increase the unclassified tailings slurry from 38% to the required concentration of 46% in the shortest time. This can meet the requirements of the flocculation and sedimentation concentration of the tailings consolidation and piling in the surface subsidence areas. |
| keywords:unclassified tailings tailings mortar concentration static settlement test flocculant flocculant unit consumption |
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