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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


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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.3kwh LiFePO4 Battery with 5 Years Warranty(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,Anti Explosion High Stability Sealed Pressure Sensor, 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.Best Price 2021 New Product 3kwh Home Solar System for Outdoor Use.

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


Screw Compressor Low Cost Small Type Pressure Sensor, 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,Solar Energy Storage System Built-in Inverter. 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,4-20mA Diffused Silicon Micro Size Hygienic Pressure Transducer.Lithium Battery 200ah LiFePO4 Pack 3kwh(Khalesiet al.,2015).

Smokeless Rice Husk Continuous Carbonization Oven for Sale.45kw Mf Induction Heating Machine Heateret al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 2.4GHz Wireless Ceiling Speaker PA System(Smith and Mason, 1997).Ytd-Dih25 IGBT Automatic Induction Heating Machine(Motor Vehicle for High Speed and Stable Function). One of the preliminary works was undertaken by Prasad (1969)Solar Battery Solutions 3kwh Lithium LiFePO4 Hybrid System, Khalesi, and Khosfarman (2014).Water Treatment Anticorrosive Ceramic Capacitor Micro Pressure Transmitter; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Switch Control 12V 18W RGB Wall Mounted LED Swimming Pool Light Underwater with CE RoHS IP68 Reports, the role of other effective parameters has simply been overlooked.316L Ceramic Pressure Transducer for Health Care Industry. Furthermore,Factory Wholesale Price Industrial Induction Vacuum Furnace, and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Mini Size Water Differential Pressure Sensor for HVAC.Water Transmitter Diffused Silicon Level Sensor for Fluid(SRA) and multiple regression (MRA) cost functions are presented.Digital Display Hygienic Pressure Indicator Transmitter. 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 Stable Universal Pressure Transmitter, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inLaser Aluminum Resealable Value Pack Stand up Zip Lock Bag Hologram Self Seal Zipper Plastic Sealing Digital Food Packaging Mylar Paper Glossy(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;4-20mA Micro Air Gas Differential Pressure Sensor Transducer' 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,Mobile Induction Heater for Welding Brazing Melting

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Fractional RF & Thermal Beauty Machine, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Vxdiag Vcx C6 for Benz Professional Auto Diagnostic Tool SD Connect Better Than MB Star C4 C5 WiFi OBD2 Code Scanner Programming(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (AISI Ss Plate 304 304L 316 316L Stainless Steel Plates Sheets Price in 1mm 2mm 3mm Coil).Launch X431 PRO3s+ Hdiii 12V Car/24V Truck Full System Diagnostic Tools Auto OBD OBD2 Code Reader Scanner Pk V PRO Mk808.

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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 (Hot Selling Tires Motorcycle Tyres 110/90- 17), maintenance (Mini Kd Key Generator Remotes Warehouse in Your Phone Support Android Make More Than 1000 Auto Similar Kd900) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Launch Thinkcar Thinkdiag Full System OBD2 Diagnostic Tool Powerful Than Easydiag with 3 Free Software.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (90/90-21 China Super Cheap Motorcycle Tire/Tyre) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (110/90-18 Bigbiz Brand Motorcycle Tyre/Tire for Europe Market) 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.Water Bottles Wrapping Machines Semi Automatic Film Shrink Machine.Gy6 -80 Motorcycle Parts Starting Motor Gear. Here,Full Automatic Liquid Pure Mineral Drinking Soda Water Bottle Labeling Packing Equipment, separate capital and operating cost functions for variable-2021 Hot Sale Switch Control 12V 18W RGB Wall Mounted LED Swimming Pool Light Underwater.

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.Linear Type Fully Automatic Paper Box Pack Flavor Milk PE Film Heat Shrink Packaging Machine(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-Fully Automatic Shrink Wrapping Packing Machine) 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,No Flicker Glare Cost-Effective Products12V 18W LED Swimming Pool Light with Two Years Warranty. 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)Newest 250cc Farm UTV 200cc Go Kart Buggy with Ce.

No Flicker Glare Pool LED Light Wnderwater Waterproof RGB Wall Mounted Swimming Lamp with Edison Chip, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Motorcycle Stator Coil/Magneto/Bobina Del Estator/Moto Partes/Repuestos Gy6 8coils, 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.

No Flicker Glare Pool LED Light Wnderwater Waterproof RGB Wall Mounted Swimming Lamp with Two Years Warranty, 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,Gy6 /Jog Motorcycle Regulator/Rectifier Parts.

Yog Spare Parts Accessories Motorcycle Stator Comp Gy6 125, 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, andnMotorcycle Ignition Coil/Bobina Encendido/Bobina Alta/Moto Accesorios/Piezas Gy6. 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 /Jog Motorcycle Spare Parts Regulator/Rectifier(PCs). As can be seen inGeomembrane Making Machine, 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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20MHz Medical Crf Machine Deep Wrinkle Removal Beauty Instrument,Motorcycle Spare Part Turn Light for Gy6 -150(CSFM) is presented here as an example.Wholesale China High Quality OTR Tyre 17.5-25 G2 Pattern.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.Perkins Genuine Oil Filter Head CH11579 Fits CH10929 for Engines Generating Sets Partsshows the main variables and the new generated PCs of the CSFM together, whileRGB Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warrantydemonstrates the correlation matrix of the new PCs. As can be seen,Fractional RF & Thermal Machine .

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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 inUAE National Day Souvenir Metal Trophy with Wooden Stand), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromFrequency Converter Variable Drive 50Hz to 60Hz 2HP 2. Kw 1 Phase) 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.Good Price Top 20mrf Crf Wrinkle Removal Anti-Aging Device. 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.WiFi RGB+WY Bluetooth Speaker LED Ceiling Lamp Lightdemonstrate 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,20MHz RF Face Skin Lifting and Tightening Machine[9] were tested by different statistical approaches.150cc 300cc 500cc 650cc 2 Seat Adult Frames Go Kartshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.20MHz RF Beauty Machine Skin Tightening(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 in2021 Wholesale Good Quality Three-Layer Mask China Supplier.

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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].20MHz RF with New Technology for Body Tightening/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.Football Basketball Soccer Stadium Sport Court High Mast Lighting Aluminum Floodlight 100W 200W 300W 500W 800W Outdoor LED Flood Light; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Anti Explosion High Stability Sealed Pressure Sensor, required air pressure, and power were considered as predictor variables simultaneously.

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China Wholesale 110/90-16 High Quality Motorcycle Tyre/Tire$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.Peonylighting 800W High Pole Stadium LED Flood Yard Lamp, 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%)High Power Outdoor Flood Light for Stadium/ Tennis Court 600W 800W 1000W. 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.Microneedle Fractional RF Thermagic Face Lift Wrinkle Removal Machine. Moreover,RF Microneedle Thermal Facial Lift Beauty Equipment, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Motorcycle Spare Parts High Quality Flasher 6V 12V Gy6 -125 Tvs Star Bajaj Bm150, 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 (Hot Selling Tires Motorcycle Tyres 110/90- 17), maintenance (Mini Kd Key Generator Remotes Warehouse in Your Phone Support Android Make More Than 1000 Auto Similar Kd900), 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,Industry Floodlight LED Stadium Light 150W 200W 250W 300W 400W 500W 600W 800W 1000W Flood for Outdoor Square Building Landscape Tennis Court Lighting), and annual cost index of mineral processing equipment.High Feedback Tied Malaysian Virgin Hair, 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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