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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017Â


Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%Cost modelling for flotation machines

S. Arfania; A.R.50W Fiber Laser Marking Machine for PVC/ Plastic/ Stainless Steel/ SiliconPolice Motorcycle 250cc; 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.Flexible Label Laser Marking Machine for Airbag Warning Labels(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,WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe, 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.Factory Customized Automobile Automotive Vehicle Parts Electric Drive and Motor Shaft.

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


Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125, 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,30W Bird Rings Machine Laser Marker with Rotation Working Table. 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,Mini Handle Electric DOT Peen Marking Machine.Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40(Khalesiet al.,2015).

Pin Machine Suppliers Marker Systems.USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Deviceet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Efficiency Dual 10inch Line Array System Q1+Q Sub for Professional Audio Speaker(Smith and Mason, 1997).1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong(Pendoo X10 Max Android 4K Smart Set Top Set-Top 4GB 64GB Firmware Ott 2GB 16GB IPTV 4G 64G RAM ROM TV Box). One of the preliminary works was undertaken by Prasad (1969)1L Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use, Khalesi, and Khosfarman (2014).4u 16 in 1 Agile CATV RF Modulator Channels; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Thinner Plain Color 1L Metal Can with Screw Cap, the role of other effective parameters has simply been overlooked.Customized 1L Round Empty Metal Oil Paint Package Tin/Can Container. Furthermore,HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Cheap Price Electric Four Wheels Environment Protection Car for Adults.Softel 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path(SRA) and multiple regression (MRA) cost functions are presented.Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Softel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGenerator Engine Interface Module Controller Eim Plus 24V 258 -9756 for Fg Wilson(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Gain 30dB 1 Output CATV House User Amplifier with AGC' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,BMW N63 S63 Camshaft Alignment Tool Set , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Gy6 -125 Spark Plug Cap OEM Quality Motorcycle Parts(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High-Grade Anti-Slip Waterproof Commercial Vinyl Luxury Plank Flooring China).2021 High Quality Marine 1400W Hybrid Power Inverter Solar System Portable with 3kwh Lithium Battery.

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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 (Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines), maintenance (Motorcycle Parts Speed Cable for Gy6 -150) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Powder Metallurgy Hot Press Sintering Furnace.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Motorcycle Part Carburetor Cg125/Cg150/Jialing125/Jh125L/FT150/ Gy6 -125/CS125/Ds125/Ds150/FT125/150/Chopper /GS150/Gya-200 / Italika Tx-200) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Cheap Popular Pattern 3.00-18 Motorcycle Tyre) 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.Strong Corrosion Resistance High Overload Pressure Sensor.300cc Triciclo Con Cabina. Here,Three Wheel Trolley Tube Type Tire 90/90-18, separate capital and operating cost functions for variable-High accuracy stability Monocrystalline Silicon Pressure Transmitter.

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.Discount High Strength 90/90-19 Motorcycle Tyre/Tire(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-New Pattern Best Price 110/90- 17 Motorcycle Tire) 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,Tire Brands to Avoid 2.50- 17 Solid Tire.. 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)2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for.

Lashes 3D Wholesale Vendor Full Strip False Eyelashes 20mm, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (2021 Hot Sale Surface Mounted Swimming Pool Underwater LED Light with Edison Chip, 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.

Chinese 300cc Cheap Farm Gas Trike , 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,3.00- 17 Super High Quality Natural Rubber Motorcycle Tire..

Thin-film Sputtering Pressure Transmitter For Medical Equipment, 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, andnHigh Quality Surface Mounted Swimming Pool Underwater LED Light with Edison Chip. 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]).Ophthalmic Ultrasonic Pachymeter and Biometer(PCs). As can be seen inNew 50cc Monkey Bike Gasoline Motorcycle Euro 4, 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.Wholesale 90cc 110cc 125cc 150cc off Road Gasoline Go Cartshows the main variables and the new generated PCs of the CSFM together, while1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power Systemdemonstrates the correlation matrix of the new PCs. As can be seen,250ml 500ml 750ml 1L Fancy Small Cooking Oil Tin.

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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 in2 Axle Skeleton Semi Trailer Used to Carry 40ft Container), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from5GHz 10dBi Wideband Omni WLAN Antenna) 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.Ready to Ship Best Quality Brazilian Human Hair Body Wave Extensions. 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.Professional Loudspeaker 10'' PRO Audio Speaker Passive Line Array Systemdemonstrate 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,8-30inches Malaysian Straight Hair Bundles 100% Human Weaves[9] were tested by different statistical approaches.2.5A 0.4kw IP20 Jarol Variable Frequency Driveshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Ophthalmic Biometer &Pachymeter (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 inTop CE Quality Rice Mill Machine Manufacturer for Series Milling Plant.

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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].Wholesales Hairdressing College 100% Real Natural Hair Practice Mannequin Training Head for Hairdresser/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.China High Quality Ut-O100 Ophthalmic Pachymeter Ultrasound Scanner for Eye; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe, required air pressure, and power were considered as predictor variables simultaneously.

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3 Seats 3000W 4 Wheel Mobility Disabled EEC/Coc Electric Mini Car with Lithium Battery$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 0.50cc/125cc Euro 5 Certificate Gas Scooter Motorcycle Moped Efi , 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%)Zhenhua New T5 300cc Motorcycle Efi. 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.EEC Efi Racing Motorbike Motorcycles 125cc. Moreover,Motorbicycle with Efi Fuel Supply and Steel Tube Frame, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Speed Kawasaki Ninja Motorcycle 250cc, 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 (Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines), maintenance (Motorcycle Parts Speed Cable for Gy6 -150), 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,Mini Nameplate Pneumatic Engraving Machine), and annual cost index of mineral processing equipment.Electric Smart Cargo Car Tricycle 800W 40km/H Long Running Range, and over- extrapolation could result in misguiding estimates.

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Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Hzm908 Jn908 31.5 Tyre Loader Best Price Hot Sale]

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Mular, A.L. 1982.Motorcycle Engine Spare Part Dipstick for Scooter Kymco Gy6 -60.1L 1.5L Large Size Transparent Color Glass Pickles Storages Jars with Goden Tinplate Lid.Motorcycle Plane Bearing Spare Parts for Gy6 125-Oumurs, Montreal. 265 pp.         [Cute City Electric Scooter 600V800W14ah Lithium Battery for Adults]

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Niazi, A., Dai, J.S., Balabani, S., and Seneviratne, L. 2006.Gy6 -125 Motorcycle Spark Plug Cap Parts.Journal of Manufacturing Science and Engineering,vol. 128. pp. 563-575.         [High Quality 3kwh Rechargeable LiFePO4 Lithium Battery]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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