本文選題：高嶺土 + 周期式高梯度磁選機(jī)��； 參考：《長沙礦冶研究院》2017年碩士論文

【摘要】：我國高嶺土礦產(chǎn)資源面臨著優(yōu)質(zhì)資源日益枯竭,同時雜質(zhì)含量高、理化性質(zhì)復(fù)雜的資源開發(fā)利用存在成本高、環(huán)境污染嚴(yán)重等問題。磁選法在當(dāng)前高嶺土提質(zhì)降雜工藝中具有工藝簡單、成本低、無污染等優(yōu)點,而電磁周期式高梯度磁選機(jī)作為磁選法加工高嶺土礦的核心裝備,其可靠性、穩(wěn)定性和經(jīng)濟(jì)性直接決定著綠色工藝在高嶺土提質(zhì)降雜工業(yè)的推廣應(yīng)用。但國產(chǎn)電磁周期式高梯度磁選機(jī)在工業(yè)化應(yīng)用中仍存在一系列問題,因此,開展電磁周期式高梯度磁選機(jī)分選流場特性研究對查找問題根源、優(yōu)化設(shè)備性能具有重要指導(dǎo)意義。針對電磁周期式高梯度磁選機(jī)分選流場特性分別開展了高嶺土礦漿懸浮液性質(zhì)分析、鋼毛聚磁介質(zhì)堆阻尼特性、實驗室型電磁周期式高梯度磁選機(jī)分選流場仿真試驗、影響分選流場分布特性的各因素分析及流場分布影響介質(zhì)堆捕集弱磁性微粒的試驗等研究內(nèi)容。分選流場仿真試驗研究及各影響因素分析:(1)礦漿懸浮液在聚磁介質(zhì)堆中以軸向滲流為主,徑向擴(kuò)散為輔。(2)分選流場具有良好的對稱性。(3)根據(jù)徑向分速度的分布情況將介質(zhì)堆從進(jìn)料端至出料端劃分為擴(kuò)散區(qū)、過渡區(qū)、分選區(qū)、過渡區(qū)、聚集區(qū)。擴(kuò)散區(qū)、聚集區(qū)徑向分速度大,其中部與邊緣滲流速度差異顯著,中部滲流速度大、礦漿流量大,邊緣滲流速度小、僅少量礦漿通過。過渡區(qū)徑向分速度相對較小,中部區(qū)域與邊緣區(qū)域滲流速度差異逐漸減小。分選區(qū)徑向分速度幾乎可以忽略,各區(qū)域基本保持在表觀滲流速度。(4)各結(jié)構(gòu)因素與操作因素對分選流場分布具有較大的影響作用,其中分別以分選罐的突擴(kuò)、突縮比,礦漿的表觀滲流速度最為顯著,大突擴(kuò)比及高表觀滲流速度均不利于礦漿在介質(zhì)堆中的均勻分布。介質(zhì)堆捕集弱磁性微粒的試驗驗證了介質(zhì)堆各區(qū)域礦漿滲流的流場分布規(guī)律,同時說明不同的滲流場對介質(zhì)堆捕集弱磁性微粒具有顯著的影響作用。分選罐突擴(kuò)、突縮結(jié)構(gòu)造成擴(kuò)散區(qū)介質(zhì)層捕集能力弱、集聚區(qū)易發(fā)生固體顆粒沉積現(xiàn)象。高表觀滲流速度條件下介質(zhì)堆有效捕集區(qū)域空間減小,且捕集能力下降。
[Abstract]:Kaolin mineral resources in China are faced with the problems of high cost and serious environmental pollution due to the depletion of high quality resources, high impurity content and complex physical and chemical properties. The magnetic separation method has the advantages of simple process, low cost, no pollution and so on. The electromagnetic periodic high gradient magnetic separator is the core equipment for processing kaolin ore by magnetic separation method, and its reliability. Stability and economy directly determine the application of green technology in kaolin industry. However, there are still a series of problems in the industrial application of domestic electromagnetic periodic high gradient magnetic separators. Therefore, it is of great significance to study the flow field characteristics of electromagnetic periodic high gradient magnetic separators to find out the root causes of the problems and to optimize the performance of the equipment. According to the separation field characteristics of electromagnetic periodic high gradient magnetic separator, the characteristics of kaolin slurry suspension, the damping characteristics of steel wool magnetic pile and the simulation test of separation flow field of laboratory electromagnetic periodic high gradient magnetic separator were carried out. The factors influencing the distribution of the separation flow field and the experiment of the medium heap trapping the weak magnetic particles are studied in this paper, and the analysis of the influence of the flow field distribution on the distribution characteristics of the separation flow field is also presented. Simulation study of separation flow field and analysis of influencing factors: 1) slurry suspension is mainly composed of axial percolation in magnetic agglomerate reactor. The separation flow field has good symmetry. 3) according to the distribution of radial velocity, the media stack is divided into diffusion zone, transition zone, sub-district, transition zone and accumulation area. In the diffusion area, the radial velocity of the concentrated area is large, the difference between the central seepage velocity and the edge seepage velocity is significant, the central percolation velocity is large, the slurry flow rate is large, the edge seepage velocity is small, only a small amount of slurry passes through. The radial velocity of the transition region is relatively small, and the difference of the velocity between the central region and the edge region is gradually decreasing. The radial velocity of the separation area is almost negligible, and each area is basically maintained at the apparent seepage velocity. (4) each structure factor and the operation factor have a great effect on the distribution of the separation flow field, among which, the ratio of sudden expansion and sudden contraction of the separation tank is respectively used. The apparent seepage velocity of slurry is the most obvious, and the large sudden expansion ratio and the high apparent seepage velocity are not conducive to the uniform distribution of slurry in the medium pile. The flow field distribution of slurry percolation in different regions of the medium reactor is verified by the experiments of collecting weak magnetic particles in the medium reactor, and it is shown that the different seepage fields have a significant effect on the capture of weak magnetic particles in the medium reactor. Because of the sudden expansion of the separation tank and the sudden contraction of the structure, the capture ability of the media layer in the diffusion zone is weak, and the accumulation area is prone to the phenomenon of solid particle deposition. Under the condition of high apparent percolation velocity, the space of the effective capture area of the media reactor decreases, and the trapping ability decreases.
【學(xué)位授予單位】：長沙礦冶研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD457

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