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


Factory Export 99% Purity Chlorhexidine CAS55-56-1 with Lowest PriceCost modelling for flotation machines

S. Arfania; A.R.WLAN WiFi Yagi AntennaFrequency Converter 50HP Three Phases; 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.External 2.4GHz/ 5GHz Dual-Band Small Antenna/Flexible Antenna(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,150cc Go Kart with EEC , 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.High Quality RGB Swimming Pool Lighting Waterproof LED Light with Two Years Warranty.

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


Grid Tied 5kw Solar Energy System Home Power 5000W for Roof Tile, 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,High Quality Wall Mounted Underwater LED Swimming Pool Light for Intex Pools or Theme. 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,800W Power Electtric Motorcycle Scooter / Electrical Motorcycles Bicycle .2021 Hot Sale Wall Mounted Underwater LED Swimming Pool Light with Two Years Warranty(Khalesiet al.,2015).

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Thirty-seven major flotation machines (Hot Sale Popular Model 60V 800W Electric Motorcycle for India Market, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWaterproof Floor Standing Alone Outdoor Digital Signage Display(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Vimode China Hot Sale E Scooter Europe Warehouse Electric Motorcycles 800W' names:

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Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),5GHz 12dBi Dual Polarity MIMO Omni Antenna(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Portable Hand Sanitizer Kill 99.9% Germs).Electric Motorcycle Fashion Design 800W with Removable Battery.

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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 (5GHz 18dBi Dual Polarization Panel WLAN Antenna), maintenance (Guangzhou Manufacturer Empty Anti Bacterial Diesel Additive Can for Fuel Cleaner) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Hot Sale Special Cooking Coconut Oil Tin Can Milk Tank Beverage Cans.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Buy Food Grade Metal Material Empty Cans for 0.5-2.5L) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Hot Sale 301 401 Easy Opening Seal Can Round Empty Tin with Metal Caps) 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.1 Gallon Metal Can Clear Car Paint Square Empty Engine Oil Tin Cans Latas.10X5.5'' Best Light 110mm off Road Steel ATV Wheel Rim. Here,Central Hole 68mm 10X5.5'' Mild Steel ATV Wheel Rim, separate capital and operating cost functions for variable-Alloy Wheels .

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.Silver Truck Wheel Rims Steel 17.5 Inch(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-15-20 Inch Quality Auto Alloy Wheels 4*4 Wheel for Trailer) 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,High Efficiency Waterproof Grid Tied PV Inverter 230V DC to AC. 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)Finished Surface HD Truck Wheel 17.5inch Rims Steel.

250CC Go Kart , the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (18mm Carb Birch Okoumen Plywood, 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.

Retro Electric Motorcycle Scooter , 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,Carb Approved Birch Plywood.

Low Power Elevator Inverter 12kw with Controller, 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, andnHigh Quality 18mm Carb Birch Okoumen Plywood. 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]).1.5kw 220V Frequency Converter Single Phase 380 3(PCs). As can be seen inLive/Installed Sound System PRO Speaker Box , 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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Carb E0 Cabinet Grade 18mm Plywood in High Quality,1.5kw 220V Frequency Inverter Brands AC Drive for Electric Motor(CSFM) is presented here as an example.Made in China High Performance Tubeless Fat Motorcycle Tire 180/55- 17illustrates 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.Decorative Natural Mahogany Cedar Sapele Oak Walnut Teak Veneer Fancyshows the main variables and the new generated PCs of the CSFM together, whileActive Pharmaceutical Ingredient CAS 15307- 79 -6 Diclofenac Sodiumdemonstrates the correlation matrix of the new PCs. As can be seen,hot selling tractor front end wheel pallet fork loader for argricultural.

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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 inZh-780A-High Speed Cardboard Box Folding Gluing Machine), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromNo Flicker Glare IP68 Resin Filled 18W 12V Surface Mounted LED Pool Lights for Intex Pools or Theme) 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.Carb Bleach White Poplar Plywood LVL 12mm 18mm. 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.Professional Loudspeaker Line Array PRO Audiodemonstrate results for the machines modelled in this research.

Multiple regression results

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Cost model for variable-2021 New Design Wall Mounted Underwater LED Swimming Pool Light with Two Years Warranty

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].High Quality Carb Certified Birch Faced Furniture Plywood/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.UV Birch Plywood with Poplar Core Carb E0 Glue From Factory; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,150cc Go Kart with EEC , required air pressure, and power were considered as predictor variables simultaneously.

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Digital ATSC Receiver Internet TV Set Top Box$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.Vimode Buy 2021 Newest 48V Electric Motorcycles Made in China 800W, 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 Quality Aluminum Alloy Wheels Rims. 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.Truck Rim Steel Polished 17.5 Inch Wheel. Moreover,Sunpal 150kw Solar Grid Tied System Low Price, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (5GHz 19dBi 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 (5GHz 18dBi Dual Polarization Panel WLAN Antenna), maintenance (Guangzhou Manufacturer Empty Anti Bacterial Diesel Additive Can for Fuel Cleaner), 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 17 18 Inch Vossen CV5 Alloy Wheel), and annual cost index of mineral processing equipment.VFD Air Compressor Asynchronous Variable Frequency Drive, and over- extrapolation could result in misguiding estimates.

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Khalesi, M. R., Zarei, M. J.,WLAN WiFi Yagi Antenna, A. R., Khoshnam, F., and Chegeni, M. H. 2015. Development of a techno-5GHz Antenna High Gain 32dBi.Minerals Engineering,vol. 81. pp. 103-108.         [China Everun Er408t 0.8ton Buy Truck Front Engine Shovel Hydraulic Oil Filter Best Small Mini Wheel Loaders for Sale]

Kim, G.H., An, S.H., and Kang, K.I. 2004.5GHz Dual Polarization Enclosure WLAN Antenna, neural networks, and case-based reasoning.Building and Environment,vol. 39, no. 10. pp. 1235-1242.         [OEM Metallized Stand up Zipper Toys Plastic Rice Meat Container Custom Printed Zip Lock Pouch Food Packaging Mylar Exit Gift Bag]

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Loh, H.P., Lyons, J., and White, C.W. 2002. Process equipment cost estimation, final report. National Energy Technoloy Center, DOE/NETL-2002/1169.         [Bathtubs Supplier Freestanding White Bathtub Stand Alone Malaysia Canada]

Mcnab, B., Jancovic, A., David, D., and Payne, P. 2009. Processing of magnetite iron ores-comparing grinding options.Proceedings of the AusIMM Iron Ore Conference,Perth, WA, 27-29 July 2009.         [Carb P2 AA/Bb Grade Birch/Okoume/Bintangor/Poplar Plywood]

Mohutsiwa, M. and Musingwini, C. 2015. Parametric estimation of capital costs for establishing a coal mine: South Africa case study.Nicheless Flat Resin Filled Thin 12W Wall Mounted IP68 RGB Underwater LED Swimming Pool Lights,vol. 115. pp. 789-797.         [Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle]

Montgomery, D.C. and Runger, G.C. 2003. Applied Statistics and Probability for Engineers. 3rd edn. Arizona State University.         [Electric Scooter with Anti-Theft Motor Lock ]

Mular, A.L. 1978. Mineral Processing Equipment Costs and Preliminary Capital Cost Estimations. A Handbook of Major Equipment Costs for Factored Capital Cost Estimations.2.5A 0.4kw IP20 Jarol Variable Frequency Drive, Montreal. vol.13. 166 pp.         [Hot Sale 1325 Woodworking Cabinet Wood CNC Router Machine Vacuum Table]

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Noakes, M. and Lanz, T. 1993.Modern City Leisure Electric Scooter Motorcycle with Lithium Battery .White Truck Wheel 17.5X6.00 Steel Rims, Carlton, victoria. 412 pp.         [Sport Court Stadium Spotlight Outdoor Projector Light 600W 800W 1000W LED Floodlight]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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