(1. 中南大學(xué) 能源科學(xué)與工程學(xué)院，長沙 410083；
2. 湖南第一師范學(xué)院 信息科學(xué)與工程系，長沙 410205)
摘 要: 為了研究氣泡在礦漿中的運(yùn)動規(guī)律及尋找氣泡的最佳尺寸范圍，運(yùn)用流體體積法(Volume of fluid，VOF)模擬不同初速度和不同初始直徑的氣泡在不同密度礦漿中的運(yùn)動過程。結(jié)果表明：在不同密度的礦漿中，浮升氣泡的最佳尺寸各不相同，隨著礦漿密度的增大，浮升氣泡的最佳尺寸減小。礦漿密度為1 175 kg/m2時(shí)，浮升氣泡的最佳尺寸為5 mm；礦漿密度為1 400 kg/m2時(shí)，浮升氣泡的最佳尺寸為4 mm；礦漿密度為1 600 kg/m2時(shí)，浮升氣泡的最佳尺寸為3 mm。在實(shí)際生產(chǎn)中，礦漿的密度為1 175~1 400 kg/m2，中等大小(直徑為3~4 mm)氣泡在運(yùn)動過程中變形平緩且變形程度小、浮升能力強(qiáng)，故其對礦物粒子的運(yùn)載能力較強(qiáng)，有利于提高浮選生產(chǎn)的產(chǎn)量和質(zhì)量。
關(guān)鍵字: 礦物浮選；氣泡運(yùn)動； 數(shù)值模擬； 懸浮流
（1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Information Science and Engineering, Hunan First Normal University, Changsha 410205, China）
Abstract:In order to research the flotation bubble motion law and the best bubble size range under different working conditions, the volume of fluid method (VOF) was applied to simulate the motion of bubbles with different initial velocities and diameters for different ore pulp densities. The results show that the optimal sizes of flotation bubble are different for different ore pulp densities, the best flotation bubble size decreases with the ore pulp density increasing; the best flotation bubble size is about 5 mm when the ore pulp density is 1 175 kg/m2; the best bubble size is about 4 mm when the ore pulp density is 1 400 kg/m2; the best bubble size is about 3 mm when the ore pulp density is 1 600 kg/m2. The ore pulp density is 1175-1400kg/m2 in the actual production, while the medium size bubbles (3-4 mm in size) have gentle deformation with small degree of deformation and big buoyancy lift, which have better capacity to carry mineral particles and effectively improve the quantity and quality in the pulp density with practical mineral flotation.
Key words: mineral flotation; bubble motion; numerical simulation; suspension fluid
