【摘要】：隨著礦產(chǎn)資源“貧、細(xì)、雜”問題的日益突出,微細(xì)粒礦物的回收一直是研究的難點(diǎn)和熱點(diǎn),Falcon離心選礦機(jī)作為一種進(jìn)口的高效重選設(shè)備,打破了傳統(tǒng)設(shè)備的回收下限,能夠有效的回收微細(xì)粒礦物。本文以半連續(xù)設(shè)備Falcon SB機(jī)型為研究基礎(chǔ),對(duì)Falcon實(shí)驗(yàn)機(jī)中礦漿的干涉沉降進(jìn)行沉降建模、模擬研究和實(shí)驗(yàn)研究,主要研究?jī)?nèi)容如下:Falcon離心選礦機(jī)的分選特征和應(yīng)用現(xiàn)狀的研究。分析三種Falcon離心選礦機(jī)的結(jié)構(gòu)特點(diǎn)和工作特性,并分析新的結(jié)構(gòu)特點(diǎn)對(duì)Falcon離心選礦機(jī)分選效果的影響;結(jié)合當(dāng)前國內(nèi)外對(duì)Falcon離心選礦機(jī)工業(yè)應(yīng)用,分析其在提高選礦回收率、減少耗能等方面的優(yōu)勢(shì)。對(duì)Falcon離心選礦機(jī)沉降機(jī)理以及相應(yīng)的參數(shù)進(jìn)行研究和分析,為建立Falcon離心選礦機(jī)干涉沉降模型提供理論基礎(chǔ)。首先,根據(jù)Falcon離心選礦機(jī)轉(zhuǎn)鼓的分區(qū)和受力情況分析其沉降機(jī)理;然后,研究影響Falcon離心選礦機(jī)分選性能的礦漿物理參數(shù)、結(jié)構(gòu)參數(shù)和操作參數(shù);最后,根據(jù)Falcon離心選礦機(jī)沉降機(jī)理和分選性能,設(shè)計(jì)分析相應(yīng)的設(shè)備參數(shù)值。基于對(duì)流擴(kuò)散方程建立Falcon離心選礦機(jī)的干涉沉降模型。首先,根據(jù)礦漿在離心機(jī)內(nèi)的運(yùn)動(dòng)特性,引入對(duì)流擴(kuò)散方程;其次,考慮分選過程中固相濃度變化和速度的變化的非穩(wěn)態(tài)過程以及不同粒度的沉降情況,建立各位置、各時(shí)刻、各粒度下的速度、濃度變化的干涉沉降模型。對(duì)建立的干涉沉降的數(shù)學(xué)模型進(jìn)行求解。首先,采用有限差分方法求解對(duì)流擴(kuò)散方程,運(yùn)用中心差分的格式將控制方程離散化,以求解濃度,并根據(jù)第1單元與第N單元位置的特殊性,分別為這兩個(gè)單元建立新的離散化方程;其次,將初始流化過程中的濃度分為三種不連續(xù)的情況,完善離散化方程的求解;然后,根據(jù)穩(wěn)定性條件確定模型的時(shí)間、空間步長(zhǎng)的大小。最后,根據(jù)建立的模型利用MATLAB編程求解濃度值。Falcon離心選礦機(jī)實(shí)驗(yàn)和仿真分析。首先,構(gòu)建實(shí)驗(yàn)系統(tǒng)進(jìn)行實(shí)驗(yàn),將實(shí)驗(yàn)礦物的分配率與模型計(jì)算分配率進(jìn)行對(duì)比分析,驗(yàn)證模型的可行性;其次,在不同的反沖水、離心力、進(jìn)礦濃度情況下進(jìn)行仿真分析;最后,以分選粒度d50和可能性偏差EP作為分配率曲線的評(píng)價(jià)指標(biāo),分析不同的操作條件給粒度分配率和分選效率帶來的影響,結(jié)果反沖水流量增大粒度分配率降低,同時(shí)分選粒度d50增大,EP減小;初始進(jìn)礦濃度的增加粒度分配率降低,分選粒度d50增大,EP減小;轉(zhuǎn)鼓轉(zhuǎn)速增大粒度分配率增大,分選粒度d50減小,EP減小。
[Abstract]:With the increasingly prominent problem of "poor, fine and miscellaneous" mineral resources, the recovery of micro-fine minerals has been a difficult and hot point in the research. As an imported high-efficiency gravity separator, Falcon centrifuge has broken the lower limit of recovery of traditional equipment. It can recover fine mineral effectively. Based on the semi-continuous equipment Falcon SB model, this paper models, simulates and studies the settlement of interference settlement of slurry in Falcon experimental machine. The main research contents are as follows: the separation characteristics and application status of the centrifugal concentrator. The structure and working characteristics of three kinds of Falcon centrifuge concentrators are analyzed, and the influence of new structural characteristics on the separation effect of Falcon centrifuge concentrators is analyzed, and combined with the industrial application of Falcon centrifuge concentrators at home and abroad, it is analyzed that they are improving the recovery rate of mineral processing. Reduce energy consumption and other advantages. The settlement mechanism and parameters of Falcon centrifugal concentrator are studied and analyzed, which provides a theoretical basis for the establishment of interference settlement model of Falcon centrifuge concentrator. Firstly, according to the partition and force condition of the drum of Falcon centrifugal concentrator, the settlement mechanism is analyzed. Then, the physical parameters, structure parameters and operating parameters of slurry which affect the separation performance of Falcon centrifuge concentrator are studied. According to the settlement mechanism and separation performance of Falcon centrifugal concentrator, the corresponding equipment parameters are designed and analyzed. The interference settlement model of Falcon centrifugal concentrator is established based on convection diffusion equation. Firstly, according to the movement characteristics of slurry in centrifuge, the convection-diffusion equation is introduced. Secondly, considering the unsteady process of the change of solid concentration and velocity in the separation process and the settlement of different particle sizes, each position and every moment is established. The interference settlement model of velocity and concentration variation at different particle sizes. The mathematical model of interference settlement is solved. Firstly, the finite difference method is used to solve the convection-diffusion equation, and the central difference scheme is used to discretize the governing equation to solve the concentration, and according to the particularity of the position of the first unit and the N element, A new discretization equation is established for the two units respectively. Secondly, the concentration in the initial fluidization process is divided into three kinds of discontinuous cases to perfect the solution of the discretization equation. Then, according to the stability conditions, the time of the model is determined. The size of the space step. Finally, according to the established model, the concentration value. Falcon centrifugal concentrator is solved by MATLAB program. Firstly, the experiment system is constructed to compare the distribution rate of experimental minerals with the calculated distribution rate of the model to verify the feasibility of the model. Secondly, the simulation analysis is carried out under different conditions of recoil water, centrifugal force and ore concentration. Finally, the granularity D50 and the possibility deviation EP are taken as the evaluation indexes of the distribution rate curve, and the effect of different operation conditions on the granularity distribution rate and separation efficiency is analyzed. As a result, the granularity distribution rate decreases with the increase of backwash water flow. At the same time, the particle size D50 increases and EP decreases, the initial concentration increases, the particle size D50 increases and EP decreases, the rotating speed increases, the particle size distribution rate increases, and the separation granularity d50 decreases.
【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】：2015
【分類號(hào)】：TD45

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本文編號(hào)：2143540