Analysis for predicting the Input Interactions of HBF Performance at -10 µm Particles Size for treating at Iron Ore Fines grade 24% to 29%.

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1 (IJRTEM) ISSN: ǁ Volume 1 ǁ Issue 9 ǁ Analysis for predicting the Input Interactions of HBF Performance at -10 µm Particles Size for treating at Iron Ore Fines grade 24% to 29%. Roopa Navalli [1], Harshit B Kulkarni [2], Praveen kumar Hiremath [3], Sangamesh Desai [4] 1,2 (Faculty, Mechanical Engineering Department, KLS GIT Belgavi, Karnataka, India) 3 (Student M.Tech Production Management, KLS GIT Belgavi,) 4(DGM Maintenance OBP 2 JSW Toranagallu Ballari Karnataka, India) ABSTRACT: Dewatering is an important process in any mineral industry. It is a process which removes the unwanted material from the liquid solid suspension called slurry by using a filter element which separates the unwanted fluid material from the solids from the feed. The paper attempts to establish the way towards analysis of Hyper Baric Filter (HBF) performance at -10μm particle size treating iron ore fines (24% to 29%). Dewatering in HBF, requires reduction in moisture and material throughput rate in terms of per hour so as to increase the performance of HBF. The present work carried out illustrates a method to predict the influence of process input parameter such as vessel pressure, snap blow and filter disk rotation for reduction in moisture percentage level and material for reduction moisture percentage level and material throughput rate for particle size in the range of 24% to 29%. Using Design of Experiments (DOE) a linear regression model is developed to study the performance of HBF full factorial design method using ANOVA to analyze the data. Validation of the results is performed by comparing the experimental values and predicted values for Material through put rate in terms of cycles/hr and reduction in moisture percentage by weight and hot spots. Keywords: Hyper Baric Filter, dewatering, design of experiments, size of particles, vessel pressure. INTRODUCTION The increasingly higher portion of fine particles causes several problems in the filtration of iron ore concentrates. One drawback is that remarkable quantities of slurry are attached to the very fine particles because of their specific surface area. Furthermore, fine particles also reduce the size of the capillaries in the filter cake. In fact, the Hyper baric filter is considered to be the efficient dewatering equipment for the treating coal. The Hyperbaric Filter is a closed system (inside the pressure vessel) as shown in figure 1.1[1] n Cake Dewatering Zone Snap Blow Cake Formation Zone Fig. 1.1: Closed System Fig. 1. 2: Components of HBF Fig. 1.3: Filtration Zones of a Disc filter (Courtesy: JSW STEELS, Toranagallu, Manual) Fig.1.2 shows the main components and the function of a hyperbaric filter. The suspension is pumped into the trough (6) continuously during filtration. The agitators (7) to maintain the suspension are either single devices between the filter discs or a paddle agitator is installed at the bottom. After filtration, the cake discharged is conveyed to the double gate discharging system (8). The control disc divides the filtration or dewatering process into three functions, as shown in Fig.1.3 The Zones are: Cake formation (The disc sectors are submerged in the suspension), Dewatering (The air pressure applied removes the liquid from the filter cake) and the Snap-blow to assisted cake discharge [1]. LITERATURE REVIEW Many researchers have worked in this area and have investigated the most influencing factors as follows. Dong-Jin Sung et al. [2] investigated the study of pressure filtration for dewatering of coal fines. The impact of five most influencing factors such as pressure applied filtration period, lump thickness, concentration of solids in feed and slurry, ph on cake moisture, reduction of moisture percentage on discharged lumps and air consumption were researched and studied. They found that the filtration duration, pressure applied and lump thickness had major influence on consumption of air as well s reduction of moisture percentage in filtered pumps. Manoj K Mohanty et al. [3] highlighted the dewatering of coal. The objective of the research was to obtain an improved understanding the influence of feed solid content and volumetric flow that affected the clean coal recovery. M K Mohanty et al. also explored the correctness or fitness of recently developed dewatering technique that is (SBF) steel belt filter, for filtration of coal fines. They used Response Surface Methodology with factorial design method for optimization of filtration process. Kenneth J. Miller and Wu-Wey Wen [4] employed a 6 inch continuous screen bowl centrifuge in pilot plant study designed to evaluate the effect of reagent addition, coal particle size distribution, slurry feed rate, and slurry feed solids concentration on dewatering of finely ground Pittsburgh bed coal. Volume 1 Issue

2 T. Sivakumar, et al. [5] stressed on computing the reduction in moisture % of the discharged cake and to improve the performance of the compressor. B K Parekh, et al. [6] stated that dewatering or filtration of coal feed is the major part in operation of coal washing. The research concentrates on the froth flotation product obtained from a coal preparation plant processing Pittsburgh no seam coal, through reduction in moisture percentage by weight. EXPERIMENTAL INVESTIGATION For the present work in conjunction with the previously published work by Praveen et.al [1], the experiments were carried on iron ore fines with percentage variation of 24 % to 29 % by keeping particle size constant of -10 microns. The effect of process input parameters such as Vessel pressure was analyzed. The effect of Snap blow and Filter disk rotation on iron ore fines for analyzing cake moisture percentage reduction and material output rate during the filtration on Hyper baric filter is observed. The literature review provides details of work carried out by various authors in the field of modeling, simulation and parametric optimization on cake moisture reduction and material output rate of the product in Hyper baric filter using different process parameters. 3.1 Experimental procedure: The Hyper baric filter (HBF) is checked for performing the filtration process for the set of standard runs as per the design matrix. a) The desired process input parameters like vessel pressure, snap blow, and filter disk rotation are set through the controller of the equipment. b) The filtration process takes place and continues in the hyper baric filter. The output in the form of cake gets discharged from the Vessel. c) At a frequency of one hour the required responses cycles/hr can be recorded directly from the display unit of the controller. i. Recording the material output rate in the form of cycles/hr. ii. One Cycle = 5 tonnes d) At a frequency of one hour a sample is collected from the discharged cake to measure the moisture percentage in the cake using moisture analyzer. e) At a frequency of one hour a sample is collected from the same discharged cake to measure the particles size in the cake using particle analyzer. SELECTION OF FACTORS, LEVELS AND RANGE a. Input Parameters: The selected major input process parameters for this work are Vessel pressure (VP), Snap blow (SB) and Filter Disk Rotation (FDR). Each input process parameters has been assigned three levels that is low, medium and high as shown in below table (1). The table shows three factors assigned with three levels. A total of 27 experiments were conducted using 3 3 full factorial design method. Three major parameters were used to check the material throughput rate, so that the moisture percentage is maintained. The input parameters are varied with low, medium and high levels on the hyperbaric filter. Hence the design matrix used is 3 3 full factorial design matrix. Code Level Table 1: Design Matrix selected Vessel pressure (Bar) Process parameters Snap blow(bar) Filter disk rotation (Rpm) A B C 1 Low Medium High b. Output Variables: The reduction of Cake moisture percentage is the most important output parameter and it is an index of product quality. Material throughput rate is a measure related to filtration method that determines production. Higher production rate implies higher productivity hence the responses selected for this work are material output rate in terms of cycles per hour and reduction of moisture percentage by weight. Volume 1 Issue

3 EXPERIMENTAL READINGS The experiment values obtained below in the Table 2 and Table 3 are noted by repeating the above procedure for each set of standard runs. Table 2 Experimental values of reduced moisture % by weight and material through put in term of cycles for -10 microns Particle size (24 to 29%) Experimental readings for -10 um size (24-29% ) SL NO VP SB FDR CYCLES MOISTURE Volume 1 Issue

4 RESULTS AND DISCUSSION The analysis of variance (ANOVA) table for 95% confidence level using Minitab-14 statistical analysis software and coefficients are used to develop a linear regression forecast model for the responses, Cycles/hr and Moisture percentage. Effect of process input parameters Vessel pressure, Snap blow, and Filter disk rotation on Cycles/hr and Moisture percentage are discussed. Table 3 ANOVA table, graph and prediction model for CYCLES/hr Source DF Seq SS Adj SS Adj MS F P VP SB FDR VP*SB SB*FDR VP*FDR ERROR TOTAL Figure 6.1 Main Effect Plots and Interaction plots for -10 microns particles size (24 to 29 %) for cycles/hr The main effect plot reveals that during operation on hyper baric filter, the material output rate in terms of Cycles/hr are affected by all the process input parameters that is Vessel pressure, Snap blow and Filter disk rotation. The Cycles/hr is increased by increasing any of the process input parameters. From ANOVA table it is found that for Cycles/hr contribution of Vessel pressure is 51.77% and contribution of Filter disk rotation is 31.57% and Snap blow pressure contributes by 13.28%. Among the interactional effects the major contribution for achieving the material output rate in terms of cycles/hr are Vessel pressure & Filter disk rotation. Linear Regression Model for Cycles/hr material through put rate for -10 microns particles size (24 to 29 %) can written as follows by using coefficients obtained from ANOVA table. General Linear Model: Moisture % versus Vessel pressure, Snap blow, Filter disk rotation for -10 microns particles size (24 to 29 %) Cycles/hr = ( ) + (38.58*VP) + (4.82*SB) + (83.05*FDR) + (7.89*VP*SB) - (0*SB*FDR) - (22.588*VP*FDR) Table 4 ANOVA table, graph and prediction model for moisture % by weight Source DF Seq SS Adj SS Adj MS F P VP SB FDR VP*SB SB*FDR VP*FDR ERROR Volume 1 Issue

5 TOTAL Invention Journal of Research Technology in Engineering & Management Figure 6.2 Main Effect Plots and Interaction plots for -10 microns particles size (30 to 35 %) for moisture % The main effect plot reveals that during operation on Hyper Baric Filter, reduction in moisture % is affected by Vessel pressure. The major contribution for achieving reduction in moisture percentage is Vessel pressure. From ANOVA table it is calculated that for reduction in moisture percentage contribution of Vessel pressure is 82.31% and contribution of Snap blow is 10.69% and Filter disk rotation contributes 5.10%. Among the interactional effects the Major contribution for achieving reduction in moisture% are Vessel Pressure & Snap Blow. Linear Regression Model for Moisture percentage for -10 microns particles size (24 to 29 %) can written as follows by using coefficients obtained from ANOVA table. Moisture% = (1.5781*VP) - (0.931*SB) + (0.167*FDR) - (0.2859*VP*SB) + (0.2083*SB*FDR) + (0.0833*VP*FDR) Confirmation of Experiments On the same HBF setup Validation was made and found to be within the required level of confidence. The verification of the experiments for cycles/hr and moisture percentage by weight for -10 microns particle size (24 to 29%) was conducted from the in between data values of the design matrix. The below table provides the percentage error calculated from experimental and predicted results. Table no 5 Verification experiments for cycles/hr and moisture % by weight for -10 microns particle size 24 % to 29 % For -10 microns particle size 24 to 29 % VP SB FDR moisture% by weight Bar BAR Rpm Experimental Predicted Percentage error % % Influence of -10µm particle size with respect to material through put rate Figure 6.3 Graph of -10um particle size Vs Avg Tonnes per hour From the graph 6.3 it is observed that increase in percentage of -10µm size particles material through put or output tonnes per hour TPH is decreasing. And it also reveals that decrease in percentage of -10µm size particles material through output rate increases that is TPH increases. It means that cake thickness increases with decrease in -10µm particles. Volume 1 Issue

6 Influence of -10µm particle size with respect to Moisture% by weight. Figure 6.4 Graph of -10um particle size Vs moisture % The graph 6.4 indicates that the higher the fines content, that is higher the percentage of -10µm size particles the lower the throughput and the higher the residual moisture by weight. It is also observed from the above graph the higher the content of coarse particles and the lower the fines, the higher the throughput and the reduction in moisture % of the cake discharged. Increase in -10um size particles there will be increase in moisture. The fine particles (Near Size Particles) will clog the filter cloth Due to that moisture will increase in the discharged cake. Influence of Vessel Pressure with respect to Moisture% Figure 6.5 Graph of vessel pressure Vs moisture % The graph 6.5 reveals that with increase in Vessel pressure there will be reduction in moisture %. And when vessel pressure is decreasing moisture % will increase of the discharged cake. Influence of Filter disk rotation with respect to Cycles/Hr Figure 6.6 Graph of Filter disk rotation VS cycles/hr From the above graph 6.6 it is observed that increase in Rpm of Filter disk there will be increase in throughput (Cycles/hr) but moisture % by weight will also increase. For Decrease in Rpm of Filter disk rotation o there will be decrease in throughput (Cycles/hr) but moisture percentage decrease of the discharged cake. CONCLUSION The present work was carried out to predict the influence of process input parameters on the reduction of moisture percentage and material throughput rate for different percentage of -10µm particle size that is for grade 24% to 29 %. The following are the conclusions drawn from the study. The material through put rate (TPH) is increasing when the percentage of -10µm size particles are less than 30 % and also with increase in vessel pressure and Filter disk rotation. The material through put rate (TPH) is decreasing if the percentage of -10µm size particles are more than 30 % and also with increase in vessel pressure and Filter disk rotation. Higher the percentage of -10µm size particles i.e. more than 30% reduction of moisture percentage is less because of the near size particles block the aperture of the filter cloth. Lower the percentage of -10µm size particles i.e. less than 30% reduction of moisture percent is high. Moisture percentage by weight is decreasing with increase in Vessel pressure. Volume 1 Issue

7 For the Response Throughput (cycles) TPH it has been observed that all three factors have positive contribution with Vessel pressure having Maximum significance. With decrease in vessel pressure there will be decrease in material through put rate. Increase in vessel pressure there will be decrease in moisture percentage by weight. Decrease in vessel pressure there will be increase in moisture percentage by weight.. REFERENCES [1] Praveen Kumar Hiremath, Roopa Navalli, Shivakumar.S, Sangamesh Desai Study of Process Input Interactions of HBF Performance at Minus-10μm Particles Size Treating at Iron Ore Fines, Advanced Engineering and Applied Sciences: An International Journal, [2] Sung, Dong-Jin, and Bhupendra K. Parekh. "Statistical evaluation of hyperbaric filtration for fine coal dewatering." Korean Journal of Chemical Engineering 13, no. 3 (1996): [3] Zhang, Baojie, Paul Brodzik, and Manoj K. Mohanty. "Improving fine coal cleaning performance by high-efficiency particle size classification." International Journal of Coal Preparation and Utilization 34, no. 3-4 (2014): [4] Miller, Kenneth J., and Wu-Wey Wen. Effect of operating parameters and reagent addition on fine coal dewatering in a screen bowl centrifuge. No. DOE/PETC/TR-85/1. USDOE Pittsburgh Energy Technology Center, PA, [5] Sivakumar, T., G. Vijayaraghavan, and A. Vimal Kumar. "ENHANCING THE PERFORMANCE OF ROTARY VACUUM DRUM FILTER." [6] Parekh, B. K., and A. E. Bland. "Fine Coal and Refuse Dewatering-Present State and Future consideration." In Flocculation and Dewatering, Processing Engineering Foundation Conference, Scheiner and Moudgil (Eds.), pp Volume 1 Issue

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