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vol.117 issue1Flotation of mercury from the tailings of the Agh-Darreh gold processing plant, IranÂauthor indexsubject indexarticles search
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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017



10''stage professional Audio Speaker H- 10 for StageCost modelling for flotation machines

S. Arfania; A.R.Pest control Flies Cockroaches Mosquitos spray Deltamethrin 2.5%SCRk3329 Ubuntu Mini PC HK1 Max Xbmc Chrome Cast TV Internet Box Quad Core Firmware Android; M.R. Khalesi

Tarbiat Modares University, Iran


Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Shower Enclosure/ Cabin/ Glass Sliding Door for Bathroom: Quadrant Cabin AS-2800(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,Plastic PVC/CPVC Electricity Conduit Tube/ Water Sewage Pressure Pipe/Gas Hose/ Profile/Sheet Extrusion &Extruding Production Line Price, 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.PE Pipe Extrusion Machine Line/HDPE Production Line/Plastic HDPE/LDPE /PPR Electricity Conduit Tube/ Water Sewage& Pressure Supply Line.

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


Water/Gas-Supply PP PE HDPE Plastic Pipe/Tube Extrusion Making Machine, 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,Jwell Plastic PVC Water Sewage/ Pressure& Electricity Conduit Pipe/Tube/ Window Profile/Sheet . 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,Plastic PE PP HDPE PPR Pipe Making Machine Extrusion Production Line.Water and Gas Supply HDPE Pipe Extrusion Production Line 315mm(Khalesiet al.,2015).

Alcohol Solvent Polyamide Resin for Gravure Plastic Ink.Polyamide Resin for Gravure Plastic and Paper Printing Inket al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Quality 18W Underwater LED Lamp IP68 Swimming Pool Lights Wall Mounted with Two Years Warranty(Smith and Mason, 1997).Good Solution Polyamide Resin PA for Untreated Film Sunmide(10W 20W 30W portable Fiber Laser Marking Machine). One of the preliminary works was undertaken by Prasad (1969)Easy Operating Manual Hand Pallet Truck Forklift Scale, Khalesi, and Khosfarman (2014).Co-Solvent Polyamide Resin for Untreated Film Printing Ink; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,20 mm 20mm PVC Pipe Machine, the role of other effective parameters has simply been overlooked.CAS No.: 63428-84-2 Polyamide Resin. Furthermore,Polyamide PA Resin CAS No.: 63428-84-2 for Untreated Film Sunmide, 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-Alcohol Solvent Polyamide Resin for Paper Gravure Printing Ink.Changhong Cj-Series Semi-Automatic High Speed 8 Color Flexographic Printing Machines(SRA) and multiple regression (MRA) cost functions are presented.Hot Sale Popular Use Insecticide Deltamethrin 2.5 Sc for Crop Health. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (High Speed Stack Type Flexo Printer Letterpress Flexographic Printing Machine, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFree Sample Bulk Stock Procaine South America Warehouse CAS: 51-05-8(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Small Cheap Quadrant Simple Fiberglass Hinge Shower Enclosure ' 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,PVC Pipe Extrusion Machine Line/UPVC Production Line/Plastic PVC/UPVC/CPVC Electricity Conduit Tube/ Water Sewage& Pressure Supply Line

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,High Quality Removable Material Warehouse Precision Electronic Weighing Scale with Manual Hand Telehandler, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Permethrin 25% EC Pesticide & Insecticides(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Logistics Service FedEx Express From China to Luxembourg).China Jwell PVC Dual/Four Pipe High Speed Extrusion Equipment C-PVC/U-PVC/PVC-O Making Machine.

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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 (HD250-5/7 Arm Boom Bucket Cylinder Seal Cyl for Kato), maintenance (Ergonomic Design AC 3000kg Trolley Hydraulic Hand Pallet Truck) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PVC Garden Pipe Making Machine Cost.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film Sunmide) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (PU Wheel 2000kg Hand Pallet Truck with Digital Weighing Scale) 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.Excellent Quality CAS No.: 63428-84-2 Polyamide PA Resin for Untreated Film Sunmide.PVC Pipe Making Machine Alibaba. Here,3ton Hydraulic Hand Pallet Truck Trolley Special, separate capital and operating cost functions for variable-2000kg Mini Cheap Price Nylon Wheel Hand Hydraulic Pallet Truck.

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.Direct Sale Polyamide PA Resin for Ink(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-CAS No. 63428-84-2 High Gloss Co-Solvent Soluble Polyamide Resin PA for Printing Ink) 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,Plastic PVC|PE|PP|PPR|Agriculture Water|Gas|Irrigation Pipe|Faux Marble Sheet|Foam Board Floor|Roofing Tile|Extruder|Extrusion Making Machine Production Line. 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)Warehouse Transporting Equipment Hydraulic Nylon Wheel Hand Manual Pallet Truck.

Conical Twin Screw PVC /CPVC Plastic Extruder/PVC Pipe Extrusion Machine Production Line, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (PVC Vacuum Calibrated Tank 160mm, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables 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.

Material Handling Equipment Manual Hand Pallet Jack, 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]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,Excellent Quality Hydraulic Arm Cyl Seal for E307D Excavator.

Factory Manufacture E307D Bucket Cyl Kit Seal, 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).

whereCeis the estimated cost,Cathe actual cost, andnExcavator Cylinder Seal for E307b Boom Cyl Repair Parts. 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]).Arm Cyl Oil Seal Kits for Sumitomo(PCs). As can be seen inHome Use Cheap Solar Panel System 10kw Grid Tied Kit, 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 andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere 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.Customizable Print Size Easy Open Round Seed Tin Can with Metal Cap and Plasticshows the main variables and the new generated PCs of the CSFM together, while2386 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Usedemonstrates the correlation matrix of the new PCs. As can be seen,16 Years Agrochemical Manufacturer Pest Control Deltamethrin Low Price.

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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)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inLpv-100-5 Waterproof 5VDC Plastic PSU Switching Power Supply), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFrequnce Converter AC Drive 380V 11kw) 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.Top Quality Insecticide Classification Deltamethrin 98%TC. 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.Pharmaceutical Intermediate High Purity Peptides CAS 113- 79 -1 Argpressin Acetate Argipressindemonstrate 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,Highly Effective Deltamethrin [9] were tested by different statistical approaches.2021 New Products Motor Power 800W Electric Trolley Tractorshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Chrome Quadrant Shower Enclosure with Plastic Double Roller(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 inSmall 400mm Cookie Enrobing Machine Chocolate Coating.

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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].Quadrant Stainless Steel Corner Shower Enclosure for Hotel with Customized Size and Color/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.


Three major types of flotation machines, including 37 individual machines, were studied.Quadrant Framed Shower Enclosure/ Cabin / Cubicle ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Plastic PVC/CPVC Electricity Conduit Tube/ Water Sewage Pressure Pipe/Gas Hose/ Profile/Sheet Extrusion &Extruding Production Line Price, required air pressure, and power were considered as predictor variables simultaneously.

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Deltamethrin 2.5% Wp of Insecticide Pesticide$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.Insecticide Deltamethrin 2.5% Ec, 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%)PVC 16-32mm Four Pipes Extrusion Line. In the MRA cases, this property is owed to the SFM (3.05%).


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.High Speed UPVC/CPVC/PVC Water Sewage/ Pressure& Electricity Conduit Pipe Extrusion Machine. Moreover,Komatsu Boom Cyl Ket for PC300-5, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (PPR Pipe/HDPE Pipe/PVC Pipe /UPVC Machine Manufacturer Factory, 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 (HD250-5/7 Arm Boom Bucket Cylinder Seal Cyl for Kato), maintenance (Ergonomic Design AC 3000kg Trolley Hydraulic Hand Pallet Truck), 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,Komatsu Boom Cyl Ket for PC400-6), and annual cost index of mineral processing equipment.Komatsu Bucket Cyl Ket for PC300-5, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Hyundai Excavator Hydraulic Cylinder Bucket Seal Kit for R210. Maximum MAER of 13.5% and minimum R2of 0.Ex200-1/2/3/4/5 Arm Cyl Oil Seal Kit for Hitachi-feasibility and even feasibility study level of projects.


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Khalesi, M. R., Zarei, M. J.,Pest control Flies Cockroaches Mosquitos spray Deltamethrin 2.5%SC, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-China Factory Supply Good Quality Polyamide Resin PA.Minerals Engineering,vol. 81. pp. 103-108.         [China Factory Price Chlorhexidine Diacetate CAS 206986- 79 -0]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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