On stability and synergistic effect of nano-bubbles in micro-silica flotation
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摘要: 针对微硅粉的提纯问题，提出了在微硅粉浮选中引入纳米气泡以提升浮选回收率的方案，分析了纳米气泡对浮选提纯微硅粉的影响；使用纳米颗粒跟踪分析(NTA)测定纳米气泡的稳定性和油酸钠对其稳定性的影响。结果表明：在捕收剂等量的情况下，在微硅粉浮选中引入纳米气泡，可以提高纳米SiO2的回收率，在捕收剂用量为1.5 g/L时，纳米SiO2回收率达到最大，为70.2 %；油酸钠可以提高水中纳米气泡的稳定性和分散性；纳米气泡可以提高浮选回收率，可能是由于纳米气泡与浮选中产生的普通浮选气泡发生协同作用。Abstract: In order to solve the purification problem of microsilica powder and improve the flotation recovery, this study introduced nano-bubbles into the flotation of micro-silicon powder, and analyzed the effect of nano-bubbles on flotation purification of microsilica powder.Nanoparticle Tracking Analysis (NTA) was used to determine the stability of nano-bubbles and the effect of sodium oleate on their stability.Results show that with the same amount of collector, the recovery of SiO2 can be improved by introducing nano-bubbles into the flotation of micro-silica powder; When the amount of collector was 1.5 g/L, the recovery of SiO2 reached the maximum of 70.2 %; Sodium oleate can improve the stability and dispersion of nano-bubbles in water; Nanobubbles can improve flotation recovery since there is a synergistic effect between nano bubbles and ordinary flotation bubbles produced in flotation.
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Key words:
- microsilica /
- fume flotation /
- purification /
- nanobubbles /
- nanoparticle tracking analysis
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图 2 不同捕收剂用量下纳米气泡对浮选回收率的影响
Figure 2. The effect of nanobubbles on the flotation recovery rate under different collector dosages
图 3 各组样品纳米气泡粒径分布
Figure 3. Particle size distribution of nanobubbles in each group measured
图 5 3D颗粒物浓度-散射光强度-粒度分布
Figure 5. Diagram of 3D Particle concentration-scattered light intensity-particle size distribution
图 7 引入纳米气泡前后颗粒与浮选机气泡的碰撞概率
Figure 7. Collision probability between particles and flotation machine bubbles before and after the introduction of nano-bubbles
表 1 微硅粉的化学成分组成
Table 1. The chemical composition of microsilica
成分 SiO2 Al2O3 Fe2O3 MgO CaO K2O Na2O C 质量分数/% 85.89 0.27 5.23 0.31 0.4 0.47 0.15 4.11 
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表 2 各组实验条件
Table 2. Test conditions of each group
组别 水 药剂 放置时间/min 1 纳米气泡水 无 30 2 纳米气泡水 无 90 3 纳米气泡水 无 180 4 纳米气泡水 油酸钠 30 5 纳米气泡水 油酸钠 90 6 纳米气泡水 油酸钠 180 7 蒸馏水 无 —
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表 3 各组样品纳米气泡稳定性表征
Table 3. Characterization of the stability of nanobubbles under different conditions
类别 样本编号 1 2 3 4 5 6 7 粒径平均数/nm 153.3 167.6 229.7 127.5 140.7 145.1 107.9 粒径众数/nm 147.0 121.6 147.2 86.2 86.5 92.9 71.1 粒径标准差/nm 42.7 63.6 100.7 71.0 82.5 71.3 56.0 d10/nm 100.9 99.0 123.4 81.0 83.3 85.3 68.6 d50/nm 150.5 153.5 210.9 103.4 111.1 123.2 91.1 d90/nm 201.8 258.2 380.0 194.2 217.0 242.3 153.9 总气泡浓度/ (108·mL-1) 2.79 2.55 1.24 6.98 3.86 2.53 0.26
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