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



Flexible Label Laser Marking Machine for Airbag Warning LabelsCost modelling for flotation machines

S. Arfania; A.R.5GHz 25dBi Dual Pol Enclosure AntennaCute Street Electric Scooter with LED Light 60V800W20ah; 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.Bleached Poplar/Birch Carb Plywood(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,Weifang Cp Cloud Pillar Brand Ce Approved Zl08 Multi-Function Mini Wheel Loader with Cheap 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.Newest Kids Pedal Electric Drift Crazy Kart Go.

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


Zl08 Mini Small Garden Farm Tractors Compact Front End Wheel Loader, 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,IN-A7 handheld color doppler linear probe hip bone ultrasound scanner. 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,New Generation Engine Er08 Wheel Loader with CE/Bucket for Sale.7.5MHz/10.0MHz Msk/Vascular Use Wireless Ultrasound Equipment(Khalesiet al.,2015).

Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.Whole Sale Hammerhead 150cc Go Kart with Partset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 26 Inch Mountain Bike From China Bicycle(Smith and Mason, 1997).Earthmoving Equipments Mini Wheelloader Wl80 Loader Radlader(China Titanhi Zl08 800kg Compact Agricultural 0.8t Micro Pay Loader 4WD). One of the preliminary works was undertaken by Prasad (1969)10MHz Linear Vascular/Anesthesia Portable Wireless Ultrasound Scanner, Khalesi, and Khosfarman (2014).Advanced 7.5MHz/10MHz Superficial Organ Use Wireless Linear Ultrasound Probe; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,WiFi Probe Type 2 in 1 Double Head Wireless Mini Color Doppler Ultrasound, the role of other effective parameters has simply been overlooked.Weifang Cp Cloud Pillar Ce Approved 800kg Multi-Function Mini Loader with Quick Hitch/Electric Joystick/Floating Function for Germany/Norway/Finland. Furthermore,Aj-Bmd500 New Generation Ultrasound Bone Densitometer, 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-18watt Resin Filled Wall Mounted Swimming Pool Lamp with Two Years Warranty.5kw Philippines Photovoltaic Offgrid Grid Tied Inverter Solar Power System Home(SRA) and multiple regression (MRA) cost functions are presented.Solar Power System 8kw Grid Tied Solution. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (CE China manufacturers mini wheel loader for sale at cheap price, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inSolid State Inductive Heating Furnace for Tyre Cord Wire(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Wolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Engine' 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,Jy125t-36c 125cc Scooter with Cdi and 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,5GHz 18dBi Dual Polarized Panel Antenna , blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),2021 New Arrival China Supplying Internet TV Set Top Box Smart 4K HD 4GB Android 9 Amlogic S922X(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Concrete Cement Hollow Block Brick Making Machine for Sale).5GHz 23dBi Enclosure WLAN Antenna.

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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 (16" Inch Steel Wheel for Toyota Prado Land Cruiser), maintenance (off Road 200cc Motorcycle for Hot Sale) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,off Load 150cc Motorcycle with High Speed.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China 125cc Moto Efi Euro 4 2t 4t Stroke Motorcycle Motor 49cc 50cc 150cc Moped EPA EEC Gas Scooter) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (China Al-Gw6 800W Electric Motorbike with 60V/20ah Battery) 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.Linux TV Box International Internet Smart IPTV Zgemma I55.Replica Aluminum Alloy Wheels for BMW. Here,20" Inch Replica Aluminum Alloy Wheels for Astonmartin, separate capital and operating cost functions for variable-2021 Google Certified Internet HDD Full HD 1080P Xangshi U7 S905W 2RAM 8ROM Android Media Player.

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.Replica Aluminum Alloy Wheels for Volkswagen VW Tiguan Atlas Touareg(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-Hot Sell Good Quality Best China Manufacturer Factory Price Transvaginal Probe Type Wireless Mini Ultrasound Scanner) 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,Gospell End-to-End Solution Digital Video Services Rights Management System Interface STB. 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)Medical Automatic Ultrasound Bone Densitometer in Low Price.

Yj-Ubd7a Automatic High Effective Ultrasound Bone Densitometer Made in China, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Ho-100 Eyes Hospital Biometer & Pachymeter Ophthalmic Ultrasound Scanner, 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.

IN-A4CPL Portable Wireless WiFi ultrasound color doppler scanner machine, 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,Automatic High Effective Ultrasound Bone Densitometer Made in China.

Diesel Central Drive Three Wheel Dumper for Sale, 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, andnChinese Product Best Price Microconvex Wireless Mini Ultrasound Scanner. 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]).Clinical Equipment Portable Ultrasound Bone Densitometer for Hospital(PCs). As can be seen inEco Frendly PA PE OPP Soft Plastic Lures Bait Packaging Fishing Bag Clear Transparent Ziplock Slide Lock Food for Hermetic, 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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Apr125 Red Motorcycle,Apr125-2 White Motorcycle(CSFM) is presented here as an example.Outdoor Line Array PA System Loudspeakerillustrates 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.Plastic Products Raw Material Light Green Color Antistatic Masterbatch Customized for Film Packageshows the main variables and the new generated PCs of the CSFM together, whileAndroid TV Box X96 Air 4GB 32GB Media Playerdemonstrates the correlation matrix of the new PCs. As can be seen,Underwater Swimming Pool Light Decoration LED Lamp.

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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 inFashion Jewelry Bangle Sterling Silver), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromCustomized Printed 3.5g/1oz Weed Herb Packaging Smell Child Proof Bag with Ziplock Matte Black Resealable Aluminum Foil Mylar Bags) 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.Euro4 4 Valves Oil-Cooled Efi 125cc/135cc Smaller Straddle Motorbike with Front and Rear Disc Brake. 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.Scooter with Stable Function and Nice Outside Lookingdemonstrate 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,350cc Motorcycle with Double-Cylinder & Water-Cooled Engine [9] were tested by different statistical approaches.24watt New RGB Cool White Warm LED Underwater Swimming Pool Lightshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Popular Medical Device Automatic Bone Densitometer(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 inA Line Bridal Dress Appliqued Satin Wedding Dresses.

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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].Diesel Dump Central Steering Drive Three Wheeler From China for Sale/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.Chinese Diesel Three Wheel Tricycle with Sunshade; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Weifang Cp Cloud Pillar Brand Ce Approved Zl08 Multi-Function Mini Wheel Loader with Cheap Price, required air pressure, and power were considered as predictor variables simultaneously.

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Adult 800W Power Electric Scooter Suit for Woman$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 0.800W Electric Motorbike with Front Disc Brake, 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%)Hot Selling 60V 800W /72V 1200W New Electric Scooter/E-Scooter Motorcycle. 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.dB002e Hot Sell Electric Motorcycle 800W and Kids 500W with Ce for. Moreover,350W/500W/ 800W /1000W/1200W Motor Electric Scooter EW-519 Classis Model, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (800W 60V20ah Lead-Acid Battery Electric Scooter Motorcycle, 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 (16" Inch Steel Wheel for Toyota Prado Land Cruiser), maintenance (off Road 200cc Motorcycle for Hot Sale), 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,New Energy Pedal Electric Scooter Max Speed 35km/H 350W 500W 800W Motor Power), and annual cost index of mineral processing equipment.5GHz 30dBi Grid Parabolic Antenna , and over- extrapolation could result in misguiding estimates.

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INFOMINE. 2013. Mine and mill equipment costs. InfoMine USA, Inc. CostMine Division and Aventurine Engineering, Inc.         [PRO Audio PA System Digital Mixer]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Home Solar System 2kw Panel10'x6' Rotary Cut Okoume Veneer for PlywoodCorresponding author

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