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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. 2017Â


60V800W Electric Scooter with Highlight Rear BoxCost modelling for flotation machines

S. Arfania; A.R.Discount High Strength 90/90-19 Motorcycle Tyre/TireSinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered; 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.New Pattern Best Price 110/90- 17 Motorcycle Tire(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,Tire Brands to Avoid 2.50- 17 Solid Tire., 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 0.2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for.

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


Lashes 3D Wholesale Vendor Full Strip False Eyelashes 20mm, 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,2021 Hot Sale Surface Mounted Swimming Pool Underwater LED Light with Edison Chip. 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,Chinese 300cc Cheap Farm Gas Trike .3.00- 17 Super High Quality Natural Rubber Motorcycle Tire.(Khalesiet al.,2015).

Thin-film Sputtering Pressure Transmitter For Medical Equipment.High Quality Surface Mounted Swimming Pool Underwater LED Light with Edison Chipet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Jwell HDPE Waterproof Membrance Roll Extrusion Line(Smith and Mason, 1997).Ophthalmic Ultrasonic Pachymeter and Biometer(Dust Collector Woodworking Machinery Supplier). One of the preliminary works was undertaken by Prasad (1969)2D Echo Color Doppler Ultrasound Scanner Diagnostic Equipment, Khalesi, and Khosfarman (2014).2021 New Arrival Malaysian Eyebrow; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,18" Remy Hair Lace Front Closure Natural Color Body Wave, the role of other effective parameters has simply been overlooked.250ml 500ml 750ml 1L Fancy Small Cooking Oil Tin. Furthermore,2D Echo Color Doppler Ultrasound Scanner, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Ready to Ship Best Quality Brazilian Human Hair Body Wave Extensions.8-30inches Malaysian Straight Hair Bundles 100% Human Weaves(SRA) and multiple regression (MRA) cost functions are presented.Ophthalmic Biometer &Pachymeter . However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (New Cooling Fast Racing Motorcycle 400cc 250cc Efi System 150km/H, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGlue Tin Can with Plastic Lid / Square Metal Paint Sizes(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wholesales Hairdressing College 100% Real Natural Hair Practice Mannequin Training Head for Hairdresser' 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,50cc/125cc Euro 5 Certificate Gas Scooter Motorcycle Moped Efi

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Zhenhua New T5 300cc Motorcycle Efi, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),EEC Efi Racing Motorbike Motorcycles 125cc(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (SMD LED Mlt-SMD-5730-02150SCR).Motorbicycle with Efi Fuel Supply and Steel Tube Frame.

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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 (High Speed Kawasaki Ninja Motorcycle 250cc), maintenance (Mini Nameplate Pneumatic Engraving Machine) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Electric Smart Cargo Car Tricycle 800W 40km/H Long Running Range.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Mini electric truck/ express vehicle/ Express vehicles) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Bost Motorcycle Parts Accessories Air Filter for 2-Wheel 4-Stroke Gy6 -125 -150 Bikes) 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.BAW Made of Electric Car with Lithium Battery.EEC L2e 1500W 3 Wheel Enclosed Electric Cabin Scooter. Here,M7 Model LHD&Rhd EV with Solar Panel Pure Electric Car, separate capital and operating cost functions for variable-50cc Monkey Bike Gasoline Motorcycle Euro4 Efi.

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.4x2 electric pickup truck/ Electric vehicle/ car(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-Electric 4 Wheelers Cars 800W 50km/H Mini Old Man Tricycle ) 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,2021 New Products Motor Power 800W Electric Trolley Tractor. 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)Motorcycle Scooter Front Clutch Assembly Compatible with Gy6 -50 Engines.

1L Tin Can with Metal Cap for Food Storage, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Motorcycle Engine Spare Part Dipstick for Scooter Kymco Gy6 -60, 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.

1L 1.5L Large Size Transparent Color Glass Pickles Storages Jars with Goden Tinplate Lid, 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,Motorcycle Plane Bearing Spare Parts for Gy6 125-Oumurs.

1L Aluminum Tin Can for Food Packaging , 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, andn1L Cone Top Tin Can with Screw Cap. 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]).Gy6 -125 Motorcycle Spark Plug Cap Parts(PCs). As can be seen inColor Custom Diesel Engine Used for Generator Set with Four-Stroke, 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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Scooter Parts,Scooter Parts Engine Gy6 -125 150cc Driven Clutch Assembly Manufacturer Price(CSFM) is presented here as an example.Vr36 Dual 10 Inch 3 Way Passive Compact Line Arrayillustrates the high correlation between predictor variables for the CSFM.

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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.Hzm908 Jn908 31.5 Tyre Loader Best Price Hot Saleshows the main variables and the new generated PCs of the CSFM together, whileCute City Electric Scooter 600V800W14ah Lithium Battery for Adultsdemonstrates the correlation matrix of the new PCs. As can be seen,Cheap 20W Fiber Laser Color Metal Marking Marker Machine 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 inNature Series Artificial Quartz Stone for Countertop/Vanity Top /Island/ Benchtop), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from980 50kw on Grid Solar System with Tied Inverter Is Upto 80kw Big Capacity.) 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.Flexible Label Laser Marking Machine for Automotive. 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.L18 /86131 Falante Professional 18inch Subwoofer 700W New Product China Supplier Hot Saledemonstrate 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,CATV Indoor Amplifier 8200[9] were tested by different statistical approaches.Diesel Engine Parts Fuel Injection Nozzle 152sn924shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.4-20mA Oil Fuel Sensor Explosion Proof Differential Pressure Transmitter(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 inHigh Quality Waterproof Flexible LED Neon 12V 24V 220V for Indoor Lighting and Outdoor Decoration.

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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].Metal Fiber Ring Color Laser Engraving Machine/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.Perfect Laser Rotary DOT Peen Marker for Sale; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Tire Brands to Avoid 2.50- 17 Solid Tire., required air pressure, and power were considered as predictor variables simultaneously.

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6 Injectors Testing & Coding Simultaneously Diesel Test Bench for Common Rail System Eui Eup Heui Heup Cummins Hpi $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 0.110/90- 17 Used Tubeless Second Hnad Motor Tire/Tyre, 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%)3kwh LiFePO4 Battery with 5 Years Warranty. 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.Anti Explosion High Stability Sealed Pressure Sensor. Moreover,Best Price 2021 New Product 3kwh Home Solar System for Outdoor Use, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Screw Compressor Low Cost Small Type Pressure Sensor, 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 (High Speed Kawasaki Ninja Motorcycle 250cc), maintenance (Mini Nameplate Pneumatic Engraving Machine), 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,Solar Energy Storage System Built-in Inverter), and annual cost index of mineral processing equipment.4-20mA Diffused Silicon Micro Size Hygienic Pressure Transducer, and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

China New Design Everun Er408 Mini Small Wheel Loader with Hydraulic PumpLine Array with Aluminum Rigging Parts for PA Speaker Corresponding author

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