基于超级絮凝的超细尾砂絮凝行为优化

为了研究不同絮凝条件下超细尾砂的絮凝效果, 本文基于超级絮凝理论, 应用超级絮凝测试仪UFT-ТFS-029, 采用相对絮凝率表征人造超细尾砂在pH值为9~12、絮凝剂单耗f_d=2~20 g·t-1、料浆剪切速率γ=100~2000 s-1、料浆固体体积分数φ=2%~14%等条件下的絮凝行为. 发现相对絮凝率随着pH、絮凝剂单耗、剪切速率的增加均先增加后减少, 而随着浆料固体体积分数的增加逐渐减少, 并获得了一定条件下的最优絮凝条件, 即pH值为11、f_d=12 g·t-1、γ=500 s-1、φ=4%. 同时, 固体体积分数越高, 达到最优相对絮凝率所需的最优剪切速率对固体体积分数的依赖性也越高. 因此, 在实际生产中需要对pH、絮凝剂单耗、剪切速率与固体体积分数等工况参数进行调整, 以达到最优絮凝效果. 应用超级絮凝理论可实现超细尾砂在极短时间内实现很好的絮凝, 为基于流场剪切速率与停留时间的深锥浓密机进料井设计提供参考. 

Optimizing the flocculation behavior of ultrafine tailings by ultra-flocculation

With the continuous pursuit of mineral resources and the development of mineral processing technology, ore is being ground more and more finely, which has resulted in large volumes of ultrafine tailings. However, ultrafine tailings are more difficult to separate from water than coarse tailings, which also makes the safe and efficient disposal of these tailings difficult. Normally, flocculation is an essential part of solid-liquid separation to improve the settling rate, and a polymer flocculant is widely used in treating ultrafine tailings. To study the influence of flocculation conditions on the flocculation effect, ultra-flocculation theory and the UltraflocTester UFT-TFS-029 were used. The relative flocculation rate was applied to characterize the flocculation behavior of artificial ultrafine tailings under the conditions of pH 9-12, flocculant dosage f_d=2 g·t-1-20 g·t-1, shear rate γ=100 s-1-2000 s-1, and solid volume fraction φ=2%-14%. The results indicate that the flocculation rate increases first and then decreases with pH, flocculant dosage, and shear rate. However, this rate decreases gradually with an increase in the solid volume fraction. The optimal flocculation conditions are: pH 11, f_d=12 g·t-1, γ=500 s-1, and φ=4%. Also, to achieve the optimal flocculation rate, the dependence of the optimal shear rate on the solid volume fraction also increases with the solid volume fraction. Therefore, it is necessary to adjust the operating parameters such as pH, flocculant dosage, shear rate, and solid volume fraction to achieve optimal flocculation. A satisfactory flocculation rate of ultrafine tailings is easily achieved in a very short time using the ultra-flocculation theory, which provides a reference for the design of feed wells based on shear rate and residence time.