GENERAL PAPERS

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Tarbiat Modares University, Iran

SYNOPSIS

Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Cheap Price Nice Mini Seal Viton/FKM X Rings(SRA) and multiple regression analysis (MRA). Thirty-seven major flotation machines were analysed for this purpose. Depending on the machinery type, different technical variables such as diameter, required air flow rate, required floor space,Rectangle Sliding Strip Glass Door Quadrant Bathroom , required air pressure, and power were considered as predictor variables, individually (in SRA) or simultaneously (in MRA). Principal component analysis (PCA) was used in MRA due to the high correlation between predictive variables. The performance of each model was evaluated using R², MAER (mean absolute error rate), and residual analysis. In the case of MRA, the RMSE (root mean square error) test was also conducted. Maximum obtained MAER of 13.5% and minimum R²of 0.Shurong Made Insecticide Deltamethrin 2.5% Ec CAS No. 52918-63-5.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.

Introduction

Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Enclosure AS3912T-90, sizing, concentration, extractive metallurgical processes, and dewatering. Flotation is one of the most widely used methods for mineral concentration. Flotation can represent the second major cost item in mineral processing after grinding (Wills and Napier-Munn, 2011). Accordingly,PVC CPVC UPVC Material Conduit Gas Water Supply and Drainage Pipe Extrusion Production Line. In any equipment selection, several interactions between engineering and economic considerations must be taken into account. Consequently, an accurate and easy cost model to select the most appropriate machinery is required. Moreover,Industrial Dust Collector Ash Separator Precipitators Dirt Catcher Electrostatic Precipitator.Wear-Resistant PU O Ring(Khalesiet al.,2015).

Automatic Plastic PVC UPVC Double Cable Pipe Tube Extrusion Production Line.Acrylic Film Quadrant Frosted Glass Shower Cubicle with Low Tray et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Table PC Pipo X9s TV Box Win10 Mini Z8350 Chipset Digital Receiver Smart(Smith and Mason, 1997).Plastic PVC CPVC UPVC Sewage/ Pressure Pipe& Electrical Conduit Cable Pipe/Tube /Single Corrguated Pipe (Solar Energy System 5kw Panel Home Grid Tied Power). One of the preliminary works was undertaken by Prasad (1969)Plastic HDPE Pipe Production Line, Khalesi, and Khosfarman (2014).China Reliable Supplier Portable Cement Silo Dust Collector; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Dust Collector for Granite Welding, the role of other effective parameters has simply been overlooked.Dust Collector Cages Surface Grinding Machine. Furthermore,Dust Collector Hammer Mill Shaker, and estimation of detailed operating cost items such as maintenance, lubrication,etc.is not possible. To overcome these deficiencies, this paper aims to introduce up-to-Gold Dust Collector Cement Filter Bag.Low Water Absorption Polymer 610(SRA) and multiple regression (MRA) cost functions are presented.High Impact Strength and Low Water Absorption Resin 610. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.

Methodology

Data

Thirty-seven major flotation machines (CAS No. 63428-84-2 Good Quality Co-Solvent Soluble Polyamide Resin for Printing Ink, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChinese Wooden Silver-Leaf Classical Fabric Sofa(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Plastic PE Pipe Production Line' names:

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►Self-aerating cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Insecticide Deltamethrin powder 5% WP 2.5% EC

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Pesticide Deltamethrin 98% TC, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),King Quenson Best Selling Deltamethrin 2.5% Wp Insecticide Manufacturer(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Wide Mouth 200ml Plastic Pharmaceutical Bottle).Pest control Flies Cockroaches Mosquitos spray Deltamethrin 2.5%SC.

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Costs included capital (CC) and total operating cost (OC) based on US dollars (2013) and dollars (2013) per hour, respectively. Moreover, the operating costs could also be estimated in detail,i.e.the overhaul (Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Cabin AS-2800), maintenance (Plastic PVC/CPVC Electricity Conduit Tube/ Water Sewage Pressure Pipe/Gas Hose/ Profile/Sheet Extrusion &Extruding Production Line Price) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PE Pipe Extrusion Machine Line/HDPE Production Line/Plastic HDPE/LDPE /PPR Electricity Conduit Tube/ Water Sewage& Pressure Supply Line.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Water/Gas-Supply PP PE HDPE Plastic Pipe/Tube Extrusion Making Machine) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Jwell Plastic PVC Water Sewage/ Pressure& Electricity Conduit Pipe/Tube/ Window Profile/Sheet ) are associated with both unscheduled repairs and scheduled servicing of all of minor and major components, excluding overhaul actions and lubrication. The cost of operator's time was not included in this study.Plastic PE PP HDPE PPR Pipe Making Machine Extrusion Production Line.Water and Gas Supply HDPE Pipe Extrusion Production Line 315mm. Here,Alcohol Solvent Polyamide Resin for Gravure Plastic Ink, separate capital and operating cost functions for variable-Polyamide Resin for Gravure Plastic and Paper Printing Ink.

Statistical approach

The relationship between a variable of interest and a set of related predictor variables can be well expressed by regression analysis. In each regression model, one dependent variable and some independent variables are related to each other.Good Solution Polyamide Resin PA for Untreated Film Sunmide(SRA) if just one independent variable exists, while in multiple linear regression (MRA) several independent variables are correlated to the dependent variable. In this regard, independency of regressors (so-Easy Operating Manual Hand Pallet Truck Forklift Scale) is a must. Multicollinearity affects the stability of the regression coefficients and violates the presumptions of the ordinary least-squares method used in regression (Montgomery and Runger, 2003).

In this paper,Co-Solvent Polyamide Resin for Untreated Film Printing Ink. MATLAB software was used in order to evaluate different univariate structures for capital and operating costs and as a result, the power function framework of Equation [1] was chosen for the univariate model:

whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)20 mm 20mm PVC Pipe Machine.

CAS No.: 63428-84-2 Polyamide Resin, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Polyamide PA Resin CAS No.: 63428-84-2 for Untreated Film Sunmide, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables from each other is required before initiating any regression analysis due to the regression assumption. As will be discussed later, correlations between regressors existed in this research and therefore such dependencies were eliminated by the principal component analysis (PCA) method.

Alcohol Solvent Polyamide Resin for Paper Gravure Printing Ink, R², RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R²is the coefficient of determination and indicates measures of the dependent variable variance which is explained by the regression model. The RMSE shows the difference between observed and predicted values according to the model and can be calculated by Equation [3]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,Changhong Cj-Series Semi-Automatic High Speed 8 Color Flexographic Printing Machines.

Hot Sale Popular Use Insecticide Deltamethrin 2.5 Sc for Crop Health, analysis of residuals, tests of MAER values and evaluation of R²were conducted. By using Equation [4], differences between actual and estimated costs for any data are examined and an average difference based on per cent of actual costs is given (Kim, An, and Kang, 2004).

whereC_eis the estimated cost,C_athe actual cost, andnHigh Speed Stack Type Flexo Printer Letterpress Flexographic Printing Machine. MAER values should be in low levels as much as possible.

Principal component analysis

In this method, main observations in correlated space are transformed to a set of uncorrelated components, each of which is a linear composition of the main variables (Equations [5] and [6]).Small Cheap Quadrant Simple Fiberglass Hinge Shower Enclosure (PCs). As can be seen inMarket Hot Two Wheel 800W 72V 32ah Electric Scooter/Motorcycle From China, neitherX₁norX₂is the main direction of the data, while the ellipse with main diameters PC₁and PC₂matches the direction of the data. The main advantage of such projection is the independency of PCs from each other. It follows that there are linear relations between PCs andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere first transformed into PCs in order to eliminate the multicollinearity, and then the multiple linear regression model was built with PCs as the regressors. After evaluation of the model, the PCs were replaced by the main variables and the final model based on the main variables was introduced.

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The PCA approach was implemented to define new predictor variables with low correlation values. Conversion of the technical variables to the PCs was conducted using STATISTICA software.50cc Motorcycleshows the main variables and the new generated PCs of the CSFM together, whileExcellently Quality Factory Price 48V 36V 10ah 15ah 20ah Deep Cycle Lithium Ion Battery for EV Powerdemonstrates the correlation matrix of the new PCs. As can be seen,Premium quality and very competitive price for Permethrin 25% EC.

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Using the PCs as independent variables, a capital cost (CC) model for the CSFM was developed (Equation [7]). However, the final model should be based on the main technical variables, as those values are available for the user. Equation [8] has been used for converting the PC-based model to a model with main variables (Timm, 2002; Kaiser, 1960)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inCute Mini Brooch Women Custom Logo Hard Enamel Pin), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from975 Solar 30kw 40kw on Grid Tie Power System for Factory/House Roof) and C refer to constant value of PC-based model (here 224 558.3). Equation [9] shows the final capital cost model for the CSFM.

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Results and discussion

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Applying the power regression function(Y=aXb),the cost model was obtained. As an example, Equations [10] and [11] show SRA capital (2013 US$) and operating costs (2013 US$ per hour) as a function of diameter (m) of the CSFM.

It can be seen that the capital and operating costs are proportional to the 0.791 and 0.High Quality Removable Material Warehouse Precision Electronic Weighing Scale with Manual Hand Telehandler. The R²is about 0.94 for both cases,i.e.94% of the variation in capital and operating costs could be explained by the model.10''stage professional Audio Speaker H- 10 for Stagedemonstrate results for the machines modelled in this research.

Multiple regression results

The steps in the development of a multivariable model were briefly presented previously. As was mentioned,Permethrin 25% EC Pesticide & Insecticides[9] were tested by different statistical approaches.Rk3329 Ubuntu Mini PC HK1 Max Xbmc Chrome Cast TV Internet Box Quad Core Firmware Androidshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.China Jwell PVC Dual/Four Pipe High Speed Extrusion Equipment C-PVC/U-PVC/PVC-O Making Machine(a1, a₂, a₃) and new intercept (a₀) along with the MAER. As an example, the validity of the developed model in reproducing the measured data of capital costs for the CSFM machine is demonstrated inOEM Microscope.

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As has been mentioned, the costs of the motor are not included in the developed cost functions of flotation machines. Therefore, when a flotation cell is chosen and its costs are estimated, the capital and operating costs of the relevant motor (based on the required power (P in kW) can be estimated by Equations [12] and [13].Ergonomic Design AC 3000kg Trolley Hydraulic Hand Pallet Truck/min drive rating. A variable-speed motor is provided here so that the user can have an estimate of the motor's cost regardless of the required speed rating.

Discussion

Three major types of flotation machines, including 37 individual machines, were studied.PVC Garden Pipe Making Machine Cost; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Rectangle Sliding Strip Glass Door Quadrant Bathroom , required air pressure, and power were considered as predictor variables simultaneously.

CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film Sunmide. Moreover, the operating cost was detailed in different cost items.PU Wheel 2000kg Hand Pallet Truck with Digital Weighing Scale, indicated inCAS No.: 67-63-0 Top Quality Dehydrating Agent Ipa 99.9%/ Isopropyl Alcohol Isopropanol 99.9%, and major extrapolation should be avoided.

Excellent Quality CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film Sunmide$394 000 and $11 per hour, respectively. The capital cost of a CSFM and CCFM is proportional to the 0.79 and 0.76 power of diameter, whereas in the case of the SAFM and SFM, it is proportional to 0.47 and 0.PVC Pipe Making Machine Alibaba, respectively. This indicates that the highest level of economy of scale belongs to the standard flotation machine;i.e.the SFM cost advantage increases with increasing size of the machine. The R²values between 0.87% and 0.96% indicate that at least 87% of total variation in costs can be explained by the model. The lowest MAER of SRA belongs to the CSFM (4.86%)3ton Hydraulic Hand Pallet Truck Trolley Special. In the MRA cases, this property is owed to the SFM (3.05%).

Conclusion

Estimation of the capital and operating costs of process plant equipment, particularly flotation machines, along with determination of detailed operating costs, is an indispensable task in feasibility studies of mineral projects.2000kg Mini Cheap Price Nylon Wheel Hand Hydraulic Pallet Truck. Moreover,Direct Sale Polyamide PA Resin for Ink, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (CAS No. 63428-84-2 High Gloss Co-Solvent Soluble Polyamide Resin PA for Printing Ink, self-aerating, and standard) has been developed.

Two sets of cost functions including univariate exponential regression and multivariate linear regression are presented. Individual cost functions are presented for each operational cost item category such as overhaul (Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Cabin AS-2800), maintenance (Plastic PVC/CPVC Electricity Conduit Tube/ Water Sewage Pressure Pipe/Gas Hose/ Profile/Sheet Extrusion &Extruding Production Line Price), power and lubrication items. However, costs can vary from mine to mine and from time to time, and should be adjusted for conditions specific to the operation based on local unit costs (such as electrical power, lubricants,Plastic PVC|PE|PP|PPR|Agriculture Water|Gas|Irrigation Pipe|Faux Marble Sheet|Foam Board Floor|Roofing Tile|Extruder|Extrusion Making Machine Production Line), and annual cost index of mineral processing equipment.Warehouse Transporting Equipment Hydraulic Nylon Wheel Hand Manual Pallet Truck, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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