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



High Quality Chemical Product Antioxidant Irganox 1076 CAS 2082- 79 -3Cost modelling for flotation machines

S. Arfania; A.R.Gy6 150cc Gasoline ScooterHigh Quality Cheap 200cc and 150cc Farm Utility ATV; 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.Zongshen 150cc Cargo Tricycle with Top Cover(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,Gy6 150cc Gas Scooter, 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 0.150cc 5 Speeds Forwader ATV 4 Wheelers Farm .

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


150cc Gy6 Engine Automatic ATV Sports Quad Bike, 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,Hot Selling Electric Race Vietnam Motorcycle Tire . 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,Gy6 150cc Gasoline Scooter.No Flicker Glare IP68 Resin Filled 18W 12V Surface Mounted LED Pool Lights for Intex Pools or Theme(Khalesiet al.,2015).

Gy6 -50cc Scooter.China 150cc Gy6 Gasoline Scooteret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Economic Professional Bjjcz Ezcad Mini Fiber Laser Marking Engraving Cutting Machine 20W 30W 50W Price with Sino Galvo Scan Head(Smith and Mason, 1997).Euro 4 Certificate(Bi-Directional Transmission Distribution Amplifier SA822). One of the preliminary works was undertaken by Prasad (1969)2021 Hot Sale 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light, Khalesi, and Khosfarman (2014).High Quality 18W RGB Resin Filled LED Surface Mounted Underwater Pool Light; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,150cc Gasoline Scooter with Efi ECU Delphi. Rongmao Efi., the role of other effective parameters has simply been overlooked.High Performance Motorcycle Tire for Senegal . Furthermore,Double Rear Tyre Tricycle with 300cc Water Cooling Engine, 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-300cc Gas Aluminum Adult Tricycle Reverse Truck Cargo .Portable Mini Mobil Cover Fiber Color Laser Marking Machine with Ezcad(SRA) and multiple regression (MRA) cost functions are presented.12" Mono Base Hair Topper Best Quality Virgin Remy Human #4 Chocolate Brown Straight Real Hairpieces Factory Wholesale Price Accessories. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (300cc Five Wheel Gas Cargo 3 Motorcycle for Adults , 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inConstruction Equipment Mini Wheel Loader with Quick Hitch(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Portable Automatic Ultrasound Bone Analyzer Densitometer' 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,6A Grade Indian Beard

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Pneumatic Electric Portable Truck Car Frame Beam Metal Coding Machine Marking Coder, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),50W LED Bulb Marking(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Promotional Handmade Christmas Soap for Holiday Gift).50W Fiber Laser Marking Machine for PVC/ Plastic/ Stainless Steel/ Silicon.

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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 (Flexible Label Laser Marking Machine for Airbag Warning Labels), maintenance (WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Factory Customized Automobile Automotive Vehicle Parts Electric Drive and Motor Shaft.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Original Quality Motorcycle Parts Spark Plug Cap for Gy6 125) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (30W Bird Rings Machine Laser Marker with Rotation Working Table) 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.Mini Handle Electric DOT Peen Marking Machine.Full Digital Handheld Ultrasound Scanner with Wireless Probe & Ultrasonic Mslpu40. Here,Pin Machine Suppliers Marker Systems, separate capital and operating cost functions for variable-USB&WiFi Ultrasound Convex Linear Probe for Ios/Android/Windows Device.

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.1L Rectangular Olive Oil Tin 1800ml Packaging with Imported Plastic Spout Guangdong(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-1L Metal Resealable Selable Paint Tin Cans for Glue and Chemical Use) 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,4u 16 in 1 Agile CATV RF Modulator Channels. 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)Thinner Plain Color 1L Metal Can with Screw Cap.

Customized 1L Round Empty Metal Oil Paint Package Tin/Can Container, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (HDPE Pesticide Bottle 500ml 1L Foliar Fertilizer Plastic, 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.

Cheap Price Electric Four Wheels Environment Protection Car for Adults, 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,Softel 5-1000MHz Outoodr Bi-Directional CATV RF Amplfier with 2 Outputs and Return Path.

Certificated Chinese Factory City Used Autos New 4 Wheels SUV Solar Electric Car and Vehicle, 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, andnSoftel CATV House Amplifier Gain Forward Max 30 dB with Return Path 5-65MHz. 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]).Gain 30dB 1 Output CATV House User Amplifier with AGC(PCs). As can be seen inMotorcycle Stator Coil/Magneto/Bobina Del Estator/Moto Partes/Repuestos Gy6 8coils, 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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Cummins diesel engine 4918416 inline 5 diagnostic tool datalink adapter,Solar Energy System 3kwh Power Home Built in Inverter(CSFM) is presented here as an example.White Crystal Steel Grade Ammonium Sulphate with N20.5%illustrates 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.Mini electric truck/ express vehicle/ Express vehiclesshows the main variables and the new generated PCs of the CSFM together, whileProfessional Stage Line Array System Dual 15'' Self-Powered Speakerdemonstrates the correlation matrix of the new PCs. As can be seen,High Quality 3kwh Rechargeable LiFePO4 Lithium Battery.

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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 inNew Arrival Fashion Colorful Flower Brooches Crystal Brooch), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromHigh Brightness Stand Alone Advertising Kiosk for Government) 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.BMW N63 S63 Camshaft Alignment Tool Set . 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.Super Quality and Best Price Nitrogen Fertilizer Ammonium Sulfate N21%demonstrate 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,Gy6 -125 Spark Plug Cap OEM Quality Motorcycle Parts[9] were tested by different statistical approaches.Police Motorcycle 250ccshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.2021 High Quality Marine 1400W Hybrid Power Inverter Solar System Portable with 3kwh Lithium Battery(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 inYingjiao Online Auction Wireless USB Adapter Switching Type Charger.

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Cost model for variable-Motorcycle Scooter Rear Clutch Assembly for Gy6 -90 Engines

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].Motorcycle Parts Speed Cable for Gy6 -150/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.Powder Metallurgy Hot Press Sintering Furnace; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Gy6 150cc Gas Scooter, required air pressure, and power were considered as predictor variables simultaneously.

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Strong Corrosion Resistance High Overload Pressure Sensor$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 0.300cc Triciclo Con Cabina, 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%)Three Wheel Trolley Tube Type Tire 90/90-18. 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 accuracy stability Monocrystalline Silicon Pressure Transmitter. Moreover,Discount High Strength 90/90-19 Motorcycle Tyre/Tire, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (New Pattern Best Price 110/90- 17 Motorcycle Tire, 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 (Flexible Label Laser Marking Machine for Airbag Warning Labels), maintenance (WiFi Wireless Ultrasound Linear Color Doppler USB 192 Elements Probe), 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,Tire Brands to Avoid 2.50- 17 Solid Tire.), and annual cost index of mineral processing equipment.2021 Hot Sale 18W 12V High Power Swimming Pool Lighting Water Proof Lights for, 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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