(中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用Fluent6.3軟件對(duì)自制水力分選設(shè)備的流場(chǎng)進(jìn)行模擬。模擬結(jié)果表明：設(shè)備錐體內(nèi)流體的旋轉(zhuǎn)運(yùn)動(dòng)使礦漿在徑向分散和分離，向上運(yùn)動(dòng)的流體能促使固相尤其是粒度較小和密度較低的含硅相向上運(yùn)動(dòng)，實(shí)現(xiàn)鋁相和硅相在軸向上的分離；斜板能顯著提高鋁相在上升過程中的沉降效率。在自制設(shè)備上進(jìn)行的實(shí)際礦石脫硅試驗(yàn)結(jié)果表明：當(dāng)原礦鋁硅比(質(zhì)量比)為4.7時(shí)，在攪拌器轉(zhuǎn)速為150 r/min、斜板高度為16 cm、給礦量為100 mL/min及底流與溢流體積比為1׃3.5的條件下，經(jīng)設(shè)備一次脫硅處理，可得到Al2O3回收率為90.64%、鋁硅質(zhì)量比為6.34׃1的精礦。
附件:30-p1713-22188
關(guān)鍵字: 鋁土礦；脫硅；水力分級(jí)；模擬
（School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The flow field in the self-made hydraulic classification equipment was simulated by Fluent 6.3 software. The simulation results show that the slight turbulent in the cone zone makes the mineral particles disperse and separate in the radial direction. The upwelling makes the solid phase move up, especially for silicates with the small particle size and low density, leading to the separation of alumina phase and silicon phase in the radial direction. The sloping plates improve the sedimentation efficiency of aluminum solid phase greatly in the upward process. Furthermore, the experimental results on the real bauxite ores show that a concentrate with Al2O3 recovery of 90.64% and mass ratio of Al to Si of 6.34׃1 can be obtained from the feed with the mass ratio of Al to Si of 4.7 based on one stage desiliconization separation. At this time, the speed of the impeller is 150 r/min, the height of sloping plates is 16 cm, the speed of the feed is 100 mL/min and the volume ratio of overflow to underflow is 1:3.5.
Key words: bauxite; desiliconization; hydraulic classification; simulation
