本文選題：浮選機(jī) + 數(shù)值模擬��； 參考：《江西理工大學(xué)》2017年碩士論文

【摘要】：目前浮選是礦物分選的主要手段之一。浮選機(jī)是浮選工作中的核心機(jī)械,礦物分選過程在浮選機(jī)內(nèi)部進(jìn)行。研究浮選機(jī)工作參數(shù)、浮選機(jī)內(nèi)部浮選動(dòng)力學(xué)參數(shù)及浮選指標(biāo)三者之間的關(guān)系有助于提高礦物分選效率優(yōu)化浮選指標(biāo)。本文通過數(shù)值模擬的手段,對(duì)XFD-II 1.0L浮選機(jī)內(nèi)部流場(chǎng)進(jìn)行了適當(dāng)?shù)暮?jiǎn)化,提出Eulerian多相流模型和標(biāo)準(zhǔn)k-ε湍流模型對(duì)浮選機(jī)內(nèi)部流場(chǎng)進(jìn)行模擬�？疾炝宋宸N葉輪轉(zhuǎn)速和五種充氣量下的單相流模型、氣液兩相流模型及固液兩相流模型的流場(chǎng)特性,探索了葉輪轉(zhuǎn)速、充氣量等工作參數(shù)與礦漿含氣量、空氣分散率等浮選動(dòng)力學(xué)參數(shù)的關(guān)系,并通過空氣分散率測(cè)定驗(yàn)證了數(shù)值模擬結(jié)果。主要研究工作與結(jié)論如下:(1)根據(jù)XFD-II 1.0L型機(jī)械攪拌式浮選機(jī)內(nèi)部流場(chǎng)特點(diǎn)及多相流特征,忽略泡沫層對(duì)流場(chǎng)的影響,對(duì)浮選機(jī)內(nèi)部流場(chǎng)進(jìn)行了簡(jiǎn)化,對(duì)流域的攪拌混合區(qū)、礦物輸運(yùn)區(qū)、脈石分離區(qū)流場(chǎng)特性進(jìn)行了研究。(2)考察了葉輪轉(zhuǎn)速500r/min、1000r/min、1500r/min、1900r/min、2400r/min五個(gè)值下攪拌混合區(qū)、礦物輸運(yùn)區(qū)、脈石分離區(qū)及浮選槽底部在單相流模型及氣液兩相流中礦漿流的速度分布特性,發(fā)現(xiàn)流場(chǎng)各區(qū)域速度隨葉輪轉(zhuǎn)速升高而增大。(3)考察了充氣量50L/h、100L/h、150L/h、200L/h、250L/h下各葉輪轉(zhuǎn)速下浮選槽底部和礦漿自由液面附近礦漿含氣量和空氣分散率的變化。自由液面礦漿含氣量隨葉輪充氣量增大而增大,空氣分散率隨充氣量增大在開始階段保持較高水平并緩慢降低,當(dāng)充氣量增大到某一臨界點(diǎn)后空氣分散率迅速降低,并且這一臨界點(diǎn)隨葉輪轉(zhuǎn)速的上升高逐漸增大。(4)在綜合考慮礦漿含氣量和空氣分散率的情況下得出XFD-II 1.0 L型浮選機(jī)合適的工作參數(shù)為葉輪轉(zhuǎn)速1900r/min、充氣量為250L/h。經(jīng)過實(shí)驗(yàn)室浮選試驗(yàn)驗(yàn)證數(shù)值模擬結(jié)果選定的浮選機(jī)工作參數(shù)合理,具有工程實(shí)際應(yīng)用的意義。(5)考察不同工作參數(shù)下白鎢礦、螢石和方解石三種礦物在浮選槽底部和礦漿自由液面附近的含量。經(jīng)分析1700r/min至1900r/min目的礦物白鎢礦相對(duì)另外兩種礦物在浮選槽上部輸運(yùn)區(qū)及分離區(qū)含量較高。經(jīng)過實(shí)驗(yàn)室白鎢礦純礦物浮選試驗(yàn)驗(yàn)證,白鎢礦在礦漿上部的數(shù)值模擬結(jié)果含量與實(shí)際浮選白鎢礦回收率成正比。并確定了適宜白鎢礦與脈石礦物方解石、螢石的分離最佳條件是葉輪轉(zhuǎn)速1900r/min,充氣量250L/h。
[Abstract]:At present, flotation is one of the main means of mineral separation. Flotation machine is the core machinery in flotation, and mineral separation process is carried out inside flotation machine. The study on the working parameters of flotation machine, the relationship between flotation kinetic parameters and flotation index in flotation machine is helpful to improve the separation efficiency of mineral and optimize the flotation index. In this paper, the internal flow field of XFD-II 1.0L flotation machine is simplified by numerical simulation. Eulerian multiphase flow model and standard k- 蔚 turbulence model are proposed to simulate the flow field in XFD-II 1.0L flotation machine. The flow field characteristics of single-phase flow model, gas-liquid two-phase flow model and solid-liquid two-phase flow model under five kinds of impeller speed and five kinds of aeration were investigated, and the working parameters such as impeller speed, gas volume and slurry gas content were explored. The relationship between the flotation kinetic parameters such as air dispersion and so on, and the numerical simulation results were verified by air dispersion measurement. The main research work and conclusions are as follows: (1) according to the characteristics of internal flow field and multiphase flow in XFD-II 1.0L mechanical flotation machine, the flow field of flotation machine is simplified and the mixing zone of basin is simplified. The characteristics of flow field in mineral transport area and gangue separation region were studied. (2) the impeller speed of 500rr / min ~ 1000r / min ~ 1 500 r / min ~ 1 900 r / min = 1 900 r / min ~ 2400r / min mixing zone, mineral transport area, The velocity distribution characteristics of slurry flow in single phase flow model and gas-liquid two-phase flow in gangue separation zone and bottom of flotation cell. It is found that the regional velocity of the flow field increases with the increase of the impeller speed. (3) the gas content and air dispersion of slurry at the bottom of the flotation cell and near the free liquid surface of the slurry at the speed of each impeller are investigated. The air content of free liquid level slurry increases with the increase of impeller air volume, and the air dispersion rate keeps a high level at the beginning and decreases slowly with the increase of air volume, and decreases rapidly when the air volume increases to a certain critical point. And this critical point increases gradually with the increase of impeller speed. (4) considering the air content and air dispersion of pulp, the suitable working parameters of XFD-II 1.0 L flotation machine are impeller speed 1900 r / min and aeration volume 250 L / h. Through the laboratory flotation test, it is proved that the working parameters of the flotation machine selected by the numerical simulation results are reasonable and have the significance of engineering practical application. (5) Scheelite under different working parameters is investigated. The contents of fluorite and calcite in the bottom of flotation cell and near the free liquid level of pulp. The content of scheelite from 1700r/min to 1900r/min is higher than the other two minerals in the upper transport area and separation zone of flotation cell. The results of laboratory flotation tests show that the content of scheelite in the upper part of the slurry is directly proportional to the actual recovery rate of wolframite flotation. The optimum conditions for separation of fluorite from scheelite and gangue mineral calcite are as follows: impeller rotation speed 1900 r / min, aeration volume 250 L / h.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD456

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 艾光華;劉炯天;曹亦俊;李小兵;;旋流-靜態(tài)微泡浮選柱強(qiáng)化回收微細(xì)粒黑鎢礦[J];中南大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年11期

2 高淑玲;黃秀挺;魏_持，

本文編號(hào)：2091925