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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



Gt1544s 454083-0001 1002829 Garrett Engine Turbo for Vw PassatCost modelling for flotation machines

S. Arfania; A.R.Automatic Pure/Mineral Bottle Water Packing Machine 2.4GHz Outdoor Wireless Bridge 300Mbps Tdma High Power 500MW; 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.1000ml 71g 1L HDPE Plastic Bottle for Chemical Powders Liquids(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,300/650ml/ 1L Plastic Shampoo Cosmetic Pump Bottle, 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 0.250ml 300ml 500ml 1L Clear Glass Juice Bottle Milk.

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


20W 50W Portable Jpt/Ipg Laser Marking Machine in Germany, 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,1L /1.5L Glass Juice Bottle/Beverage Bottle. 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,Hot Wholesale 1L /2L/3L Laundry Liquid Detergent Bottle.Factory Outlet Dog Tag Laser Marking Machine for Metal 50W(Khalesiet al.,2015).

1500cc Watercraft with 3seat.Portable-Rorary Type DOT Peen Marking Machine for Metalet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Solar Energy Storage System 3kwh 5 Kwh 10kwh 48V 100ah 200ah 300ah Battery(Smith and Mason, 1997).Engine Timing Kits for Cadillac Allante 4.6L V8 281 Cid 1993(2856 3kVA/5kVA/8kVA/10kVA/12kVA Solar on-Grid Power System for Home/Office/Farm/Hotel). One of the preliminary works was undertaken by Prasad (1969)Underwater Light, Khalesi, and Khosfarman (2014).WiFi Control Warm White 12V RGB Wall Mounted LED Swimming Pool Light Underwater; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,20W/30W/50W Fiber Laser Marking Machine for Metal/Plastic and All The Metals, the role of other effective parameters has simply been overlooked.Automatic Red Point Laser Marking Machine for Metal Aluminum Plastic. Furthermore,8mm Thickness 316ss IP68 RGB DC12V 18W External Control Mode LED Swimming Pool Light, 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-IP68 8W-35W Surface Mounted Green Color LED Underwater Swimming Light.IP68 8W-35W Surface Mounted Blue Color LED Underwater Swimming Light(SRA) and multiple regression (MRA) cost functions are presented.150ah 3kwh Power Supply Deep Cycle Rechargeable Solar Battery. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (8mm Thickness 160mm 8watt DC12V RGB LED Swimming Pool Underwater Light, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWheel Loader Mini Wolf Wl80 with Forks(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;10W Tabletop Series Fiber Laser Marking Machine' 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,55% Rubber Content Tyre High Performance Diagonal Motorcycle Tires 200/55- 17

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,DOT Certified Natural Rubber Motorcycle Tires 3.00- 17 with Golden Quality, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),55% Rubber Content Tyre China High Quality Motorcycle Tires 2.75- 17(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (2014 Laptop Bag Handbag Leather Briefcase Backpack).Professional Factory Motorcycle Tyre and Motorbike .

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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 (High Quality Motorcycle Parts Tyre ), maintenance (Plastic Bottles Semi Automatic Film Shrink Wrapping Machine / Packing) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,High Speed Bottles Shrink Wrapping Machine/Group Packing Machine.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Can Beer Use Automatic PE Film Heat Shrink Wrapping Group Packaging Machine for Half Paper Box Juice Production Line) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (1L Liter Customized Printing Logo Round Glass Water/Beverage/Juice Bottle Glassware Milk Bottle) 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.Ce ISO SGS Certification Wd Series Full Automatic Linear Type PE Plastic Film Stretch Shrink Wrapping Machine Packaging.3kwh 150ah Solar Home System Li-ion Battery Factory. Here,Excellent Motorcycle Cylinder for Gy6 -100 , separate capital and operating cost functions for variable-3kwh Power Supply Solar Energy Battery Pack.

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.25kw Electromagnetic Induction Heater for Tools Welding(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-Adjustable IP65 Lumileds SMD5050 Meanwell 800W LED Flood Light) 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,Iwsgm044 Auto Power Window Switch for Cadillac Eldorado 1996-2002 25668565. 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)Mc4 Connector Combiner Box with 600V MCB for off Grid Solar System.

Professional Manufacture Y Solar Mc4 Energy System Connector PV, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Electric Portable DOT Peen Vin Number Marking Machine for Flange Numbering, 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.

Highly Quality 1500V Solar Mc4 Energy System Connector IP67 PV, 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,24watt New RGB Cool White Warm LED Underwater Swimming Pool Light.

1L High End Glass Vodka Wine Bottle with Matte Black Finish, 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, andnMc4y Solar Connector. 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]).1000V Solar Mc4 Energy System Connector IP67 PV(PCs). As can be seen inFree Shipping 99% Tranquilizer Powder Tiletamine HCl 14176-50-2 NMDA Receptor, 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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Thermal RF & Fractional Wrinkle Removal,1L 2L 5L 10L 100ml 200ml 500ml Wine Glass Bottles(CSFM) is presented here as an example.Carb /SGS Wood Fiber New Design 1220*2440mm Melamine MDFillustrates 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.5GHz 18dBi Dual Polarization Sector WiFi Antennashows the main variables and the new generated PCs of the CSFM together, whileLady's E-Scooter 800W Hot Sale Made in Chinademonstrates the correlation matrix of the new PCs. As can be seen,Wrinkle Removal Super RF Beauty 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 inSample Series Crastal White Artificial Quartz Stone Countertop/Vanity Top /Island/ Benchtop), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromCovered Tricycle Passenger Enclosed Cabin 3 Wheel Motorcycle) 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.Mc4y Tyco Solar Connector. 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.VFD AC 380V 1.5kw Three Phase Inverter Frequency Converter Variable Drivedemonstrate 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,Mc4 Electronic Connector[9] were tested by different statistical approaches.17.5-25 20.5-25 23.5-25 26.5-25 29.5-25 OTR Tire for Loadersshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Empty Plastic Bottle 500ml / 1L /1000ml HDPE Trigger Pump Spray Bottles(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 inChinese Factory Supplies Dimetridazole Powder 551 -92-8 for Antibacterial Drug.

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Cost model for variable-1000ml 500ml 250ml Airtight Glass Water Juice Bottle with Clip Top 1L

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].1L 2L 5 L Plastic HDPE Powder Bottles/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.Solar Tool Set/Bad/Box Cable Stripping Wire Cutter Mc4 Connector Spanner Wrench for PV System Panel 14-10AWG 2.5-6mm2; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,300/650ml/ 1L Plastic Shampoo Cosmetic Pump Bottle, required air pressure, and power were considered as predictor variables simultaneously.

30watt New RGB Cool White Warm LED Underwater Swimming Pool Light. Moreover, the operating cost was detailed in different cost items.All Terrain Vehicle Tyres ATV Wheel, indicated inWater Pump Frequency Inverter, and major extrapolation should be avoided.

1L Plastic Trigger Sprayer Bottle with Spray$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.Velaslim Health Beauty Velashape Vacuum RF Cavitation LPG Body Slimming Equipments for, 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%)20MHz RF Best Technology for Skin Tighten. 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.Massage Lymphatic Drainage Body Shaping Slimming Beauty Apparatus. Moreover,20MHz Thermal RF Wrinkle Removal Beauty Machine, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Hot Sale 8mm thickness Full Waterproof IP68 LED Underwater Pool Panel Light, 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 (High Quality Motorcycle Parts Tyre ), maintenance (Plastic Bottles Semi Automatic Film Shrink Wrapping Machine / Packing), 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,Color Changing Swimming Pool Lights), and annual cost index of mineral processing equipment.Body Circumference Reduction RF Vacuum Fast Slimming System Beauty Apparatus, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Underwater Pool Light with Niche . Maximum MAER of 13.5% and minimum R2of 0.Skin Tightening-feasibility and even feasibility study level of projects.


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Paper received Apr. 2015
Revised paper Received Jul. 2016

Nutrition Food Grade Dl-Pyroglutamic Acid Pure L-Pyroglutamic10pack/M Automatic PE Film Combine Heat Shrink Wrapping Bottle Packing Wrapper MachineCorresponding author

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