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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. 2017



5150-5850MHz Sector Panel Antenna with 2*16dBi Gain for Best DesignCost modelling for flotation machines

S. Arfania; A.R.Tubeless Steel Wheel Mini Wheel Loader Er08 with Hydrostatic Transmission System for Sale; 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.Home Application on Grid Tied Solar Power System 3kw(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,Home Use Cheap Solar Panel System 10kw Grid Tied Kit, 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 Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with CE RoHS IP68 Reports.

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


5GHz Antenna High Gain 32dBi, 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,5GHz Dual Polarization Enclosure WLAN Antenna. 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,32dBi 5GHz WLAN Antenna.Brown Black Opaque Chemical Industrial Container 100ml Flip Top Cap Bottle(Khalesiet al.,2015).

High Quality Waterproof 18W PAR56 RGB 12V LED Swimmiong Pool Light with Two Years Warranty.Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lightset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for 20.5-25/29.5-25/23.5-25/14.00-24/7.50-16 New E-3/L-3 Loader OTR Bias Tyre(Smith and Mason, 1997).2.5A 0.4kw IP20 Jarol Variable Frequency Drive(CAS: 13553- 79 -2; Rifamycin S). One of the preliminary works was undertaken by Prasad (1969)No Flicker Glare Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Edison Chip, Khalesi, and Khosfarman (2014).High Quality Underwater Swimming Pool Light Decoration LED Lamp; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,17 Inch Machined Aftermarket Alloy Wheel , the role of other effective parameters has simply been overlooked.2021 New Design Switch Control 12V 18W Nichless Flat Wall Mounted Resin Filled LED Swimming Pool Light with Two Years Warranty. Furthermore,New Electric Beatiful on Road 800W Scooter E-Motorcycle, 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-5GHz 15dBi Dual Polarization Enclosure WiFi Antenna.Modern City Leisure Electric Scooter Motorcycle with Lithium Battery (SRA) and multiple regression (MRA) cost functions are presented.White Truck Wheel 17.5X6.00 Steel Rims. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (7.5kw MPPT with High Efficiency Solar Water Pump Controller, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inChina 150cc Gy6 Gasoline Scooter(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywood' 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,Carb Grade 18mm Commercial Plywood

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Highlighted LED Electric Motorcycle with 60V 800W Power System, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),AC 3 Phase 380V Compact Vectorial Inverter Frequency 220V(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Mini Size Electronic Cigarette Vitamin Vape B12/Sleep/Focus/Slim/Energy).High Speed Full Size Adult 800W Z1000 Electric Motorcycle.

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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 (AC Drives Frequency Inverter for Dyeing Machine), maintenance (1220*2440*18mm Birch Plywood with Carb P2 Standard Quality) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Solar Pump Frequency Inverter MPPT Fuction 15kw Made in China.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China Wholesales Wheel Loader HR912 with Pallet Forks) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (AC Frequency Speed Controller 7.5kw VFD Drives) 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.Carb P2 Bleached White Poplar Plywood for Furniture.Professional Mini Wheel Loader for Sale with Low Price. Here,New Model Chinese Small Loader Front End Wheel for Sale, separate capital and operating cost functions for variable-Mimo Antenna 13dBi CPE.

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.1220X2440X9mm Carb P2 Glue Bleached Poplar Plywood for Furniture(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-5GHz 25dBi Dual Pol Enclosure Antenna) 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,Bleached Poplar/Birch Carb Plywood. 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)Weifang Cp Cloud Pillar Brand Ce Approved Zl08 Multi-Function Mini Wheel Loader with Cheap Price.

Newest Kids Pedal Electric Drift Crazy Kart Go, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Zl08 Mini Small Garden Farm Tractors Compact Front End Wheel Loader, 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-A7 handheld color doppler linear probe hip bone ultrasound scanner, 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,New Generation Engine Er08 Wheel Loader with CE/Bucket for Sale.

7.5MHz/10.0MHz Msk/Vascular Use Wireless Ultrasound 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, andnYn725 Yineng Mini Wheel Loader 18.5kw Cabin. 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]).Whole Sale Hammerhead 150cc Go Kart with Parts(PCs). As can be seen inDiesel Engine Parts Fuel Injection Nozzle Dlla155p273, 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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10MHz Linear Vascular/Anesthesia Portable Wireless Ultrasound Scanner,Advanced 7.5MHz/10MHz Superficial Organ Use Wireless Linear Ultrasound Probe(CSFM) is presented here as an example.Small Wheel Loader Zl08 CEillustrates 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.Q1 Professional Line Array Loudspeaker Double 10 Inch Two-Way PRO Audioshows the main variables and the new generated PCs of the CSFM together, while800W High Speed Electric Scooter/Bikedemonstrates the correlation matrix of the new PCs. As can be seen,WiFi Probe Type 2 in 1 Double Head Wireless Mini Color Doppler Ultrasound.

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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 inPostage Mail Packaging Bag Plastic Express Courier Shipping Mailer Bags), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found from100% Passing Customs Local Anesthetic Drugs Procaine for Pain Release) 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.Aj-Bmd500 New Generation Ultrasound Bone Densitometer. 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.PA Column Speaker Empty Alu. Cabinet 4.5" 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,18watt Resin Filled Wall Mounted Swimming Pool Lamp with Two Years Warranty[9] were tested by different statistical approaches.Shurong Made Insecticide Deltamethrin 2.5% Ec CAS No. 52918-63-5shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.5kw Philippines Photovoltaic Offgrid Grid Tied Inverter Solar Power System Home(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 in8g Long Standby Sport Bluetooth Music Support MP4 Player HiFi with Speaker Touch Key Students FM Radio Portable Wireless.

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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].CE China manufacturers mini wheel loader for sale at cheap price/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.Wolf Agricultural Machinery Construction Small Front End Wheel Loader with Euro5 and Tier4 Engine; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Home Use Cheap Solar Panel System 10kw Grid Tied Kit, required air pressure, and power were considered as predictor variables simultaneously.

China Portable Medical Ophthalmic a/B Ultrasound Scanner Pachymeter with B Probe for Eyes. Moreover, the operating cost was detailed in different cost items.6000W 200V-240V AC Single Phase on Gird/ Grid- Tied Solar Power Energy System, indicated inCheap CE 800W Lithium Battery Power Supply and 48V/60V Voltage Electric Motorcycle, and major extrapolation should be avoided.

Ce Approved 10 Inch Automatic High Effective Ultrasound Bone Densitometer $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 0.5GHz 10dBi Wideband Omni WLAN Antenna, 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%)Jy125t-36c 125cc Scooter with Cdi and 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.5GHz 18dBi Dual Polarized Panel Antenna . Moreover,2021 New Arrival China Supplying Internet TV Set Top Box Smart 4K HD 4GB Android 9 Amlogic S922X, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (5GHz 23dBi Enclosure WLAN Antenna, 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 (AC Drives Frequency Inverter for Dyeing Machine), maintenance (1220*2440*18mm Birch Plywood with Carb P2 Standard Quality), 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,16" Inch Steel Wheel for Toyota Prado Land Cruiser), and annual cost index of mineral processing equipment.off Road 200cc Motorcycle for Hot Sale, 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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