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



500W Powered Speaker Professional Sound Line Array System Cost modelling for flotation machines

S. Arfania; A.R.Internet TV Box Linux IPTV Zgemma I55Speaker 12 Inch SA-212 Professional Sound Box Portable Passive; 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.L-Guard Wheel Loader L-5 OTR 45/65-45 Cheap Wholesale Tyres(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,High Quality 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty, 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 0.24V 40ah Lithium Iron Battery for Electric Bike.

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


Dsola Chinese Supplier Multipurpose Mc4 Y Branch Connector, 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 Inverter 10kw 20kw Single Phase 220V off Grid Tied for Home System. 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,Dsola Customized High Heat Resistance 2 Pins Mc4 Solar Connector.Wall Mounted Swimming Pool Lamp Underwater LED Light 18watt 12V RGB with Two Years Warranty(Khalesiet al.,2015).

2074 Growatt Inverter 9kw on Grid 9000W Tied Solar Power System Home.Chinese Famous Brand Canmax Wheel Loader Cm908 Using Hydraulic Pump Machinery Can Be Used in Farmset al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Custom Printing Child Resistant Zip Plastic Food Packaging Stand-up Pouch for Weed / Ca(Smith and Mason, 1997).Waterproof IP65 Microinverter 1200W 120-230VAC Single Phase Grid Tied Solar Panel Use(1L Panit Can). One of the preliminary works was undertaken by Prasad (1969)Tycorun Famous Best 20kw Three Phase Grid- Tied DC to AC Solar Power Inverter, Khalesi, and Khosfarman (2014).Solis 10kw Grid Tied Inverter Solis-10K-4G-LV Three Phases; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,New Pattern Design 17.5-25 20.5-25 26.5-25 off Road Tyre, the role of other effective parameters has simply been overlooked.Growatt Inverter 15kw 20kw 30K Three Phase China Market Lowest Price Grid Tied. Furthermore,DC 1000V Mc4 Cable Connectors , 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-2021 New Design 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports.12V/24V/48V/60V/72V/96V LiFePO4 Battery 40ah/50ah/60ah/100ah/200ah Lithium Ion(SRA) and multiple regression (MRA) cost functions are presented.15kw Solar Inverter Grid Tied. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Dsola Cheap Wholesale Multi Contact Mc4 Solar Connector Diode, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inTwo-Way Passive Line Array (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;China Famous Brand Hr912 Shovel Loader for Agriculture Working' 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,Intelligent Power Saver for Industry Use

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,CE Approved Wolf Wl80 Zl08 Mini Wheel Loader for Farm, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Steel Copper Aluminum Iron DOT Peen Marking Machine with Rotary(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (2014 Hot Sale High Quality Custom Made Designer Lace Wedding Dress with Full Sheer Strap Button Back Long Train).RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty.

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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 (Made in China Strong Compact Mini Front Loader ), maintenance (2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Manufacture 20W Fiber Laser Marking Machine for Engraving.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (3kw Air-Cooled UHF Digital TV Transmitter DTV) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (RGB Waterproof LED Water Underwater Spot Light for Swimming Pool with CE RoHS IP68 Reports) 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.Wholesale High Performance Metal Mc4 Connector.No Flicker Glare High Purity RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Edison Chip. Here,1L Four-Color Cmyk Printing Lubricant Oil Packaging Tin Can for Car, separate capital and operating cost functions for variable-2021 New Design High Purity 18W Underwater LED Swimming Pool Light with Edison Chip.

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.IP67 1000V 3 to 1 PV Mc4 T Branch Solar Connector(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-Portable Fiber Laser Marking Machine for Vin Code/Number) 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,1L Empty Round Edilbe Cooking Oil Metal Tin. 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)2021 Set Top Box Global Version S922X TV Smart HD Android 9.0 Internet 8K.

Max Source Fiber Machine Laser Marking for Vin Number, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (1L Custom Round Small Metal Empty Tin Cans with Lids, 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.

2021 Hot Sale 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights 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,500W/ 800W Brushless Motor Electric Mobility Scooter for Cargo .

1L Microstome Metal Drum Customization Printing Logo, 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, andn1L Metal Tin Cans with Lid for Paint or Chemical. 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]).Free Sample 5GHz Antenna Rubber Gain(PCs). As can be seen inVeneer Paper Tape Reeling and Gummed Repair for Joining Repairing Core Face Door Furniture, 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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1L Printed Round Metal Paint Tin Can with Lid,4G 32g H96 Max 3566 World International Best Custom Internet Digital TV Converter 4K Smart Android Box(CSFM) is presented here as an example.Electric Bike 800W ODM Mountain Ebike with Powerful Motorillustrates 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.Hot Selling 800W Brushless Motor Electric Scooter Motorcycleshows the main variables and the new generated PCs of the CSFM together, while10'' Inch Ferrite Wooferdemonstrates the correlation matrix of the new PCs. As can be seen,38mm 42mm CATV Plug in 0~20dB Hfc Attenuator Pad.

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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 inRice Processing Machine Price Auto Mill Manufacturer), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromChinese Chery 1500cc 4X4 Sport Buggies ATV UTV Quad Scooter) 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.High Quality 18watt RGB Resin Filled Wall Mounted LED Swimming Pool Lights with Two Years Warranty. 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.Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Deliverydemonstrate 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,E-Bike / Electric Scooter /Electric Moped 60V/72V 20ah 800W 1kw 2kw[9] were tested by different statistical approaches.Sport Stimulant Supplements N-Phenethyl Dimethylamine Natural Eria Jarensis Extract Powder CAS: 10275-21-5shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Sy-A041 Medical Equipment Portable Ophthalmic Ultrasound a/B Scanner(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 inTop Quality Wheat Straw Toothbrush.

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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].Dirt Bike for 199 Cc Displacement/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.Sab-500 Ophthalmic a/B Scanner; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality 12V 18W Waterproof LED Water Underwater Spot Light for Swimming Pool with Two Years Warranty, required air pressure, and power were considered as predictor variables simultaneously.

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Industrial Energy Saving Device Made in China$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 0.150cc Enclosed Gasoline Motorized Cargo Trike with Box , 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%)Xprobe Series Built-in Screen Wireless Probe Type Ultrasound Scanner. 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.Power Saver Box Energy. Moreover,Power Saver Energy Saving Device, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Power Saver for Industrial , 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 (Made in China Strong Compact Mini Front Loader ), maintenance (2021 Best Selling 500W Electric Moped E Bike Bicycle with Pedals), 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 Saveing Box ), and annual cost index of mineral processing equipment.Industry Saveing Box , and over- extrapolation could result in misguiding estimates.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

L-Pyroglutamic AcidPolyamide Resin for Gravure Plastic and Paper Printing InkCorresponding author

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