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


CE China manufacturers mini wheel loader for sale at cheap priceCost modelling for flotation machines

S. Arfania; A.R.White Powder Vitamin a for Food and Feed GradeGrid Tied Solar Energy System 5kw 10kw 20kw 50kw 100kw 200kw 300kw 500kw; 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.Chinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantriol(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,Professional Line Array Speaker Neodymium Af15, 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.Manufacturer Supply CAS 79 -14-1 Glycolic Acid 70% 99% Cosmetic Grade.

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


Q210 Passive PA Speaker System, 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,Retinol Palmitate/Vitamin a Palmitate Oil as Food Ingredient. 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,Professional 24 Channels Digital Audio Mixer Console.100% Natural Huperzia Serrata Extract 1% 5% 99% Huperzine a Brown Powder Supplements(Khalesiet al.,2015).

Skin Care Raw Material Vitamin a Palmitate Powder.Lf Drivers 10 Inches Professional Speaker Pw1032-64et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for High Quality Printed Food Packaging Doypack Aluminium Zipper Bags(Smith and Mason, 1997).12" Loudspeaker as Monitor Speaker System 12 Inch Powerful Coaxial(Top Selling 1). One of the preliminary works was undertaken by Prasad (1969)Made in China PA Speaker System Three Way Loudspeakers, Khalesi, and Khosfarman (2014).Line Array Speaker Professional PA System Two Way Full Rang Passive ; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Pyridinecas Number 110//86//1 Used as Chemical Reagent, the role of other effective parameters has simply been overlooked.Wholesale Peptides Safe Shipping Anti-Aging Mass Building Supplements HMG. Furthermore,P-Toluenesulfinic Acid Sodium Salt Hydrate , and estimation of detailed operating cost items such as maintenance, lubrication, not possible. To overcome these deficiencies, this paper aims to introduce up-to-Bloom Tech Chemical Reagent Bis .Cyclopropyl Acetylene/ Lide Pharma- Factory Supply / Best Price CAS 6746-94-7(SRA) and multiple regression (MRA) cost functions are presented.CAS: 13463-67-7 Titanium Dioxide Powder. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.



Thirty-seven major flotation machines (Nutrition Food Grade Dl-Pyroglutamic Acid Pure L-Pyroglutamic, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inGrid Tied Inverter 10kw 15kw 20kw Home Set Solar System(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Factory Supply 99% Dexketoprofen Trometamol Powder' 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,PRO Audio PA System Digital Mixer

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),J8 Dual 12'' Line Array PA Speaker Professional Stage Audio System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (RFID Keypad Access Controller/Reader).10 " 12"15"18" PA Speakers Loudspeaker Cabinet/Enclosure.

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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 (Wild Bee Venom Extract Melittin 99% Powder for Skin Care), maintenance (Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Retinoic Acid CAS 302- 79 -4 in Stock.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Plastic Clear White Stand-up Drinking Liquid Spout Food Packaging Bag) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (ISO Certified 100% Natural L-Arginine Powder) 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.High Quality Cosmetic Grade Hydroxyacetic Acid Glycolic CAS 79 -14-1.Chemical Reagent Bloom Tech 2. Here,High Quality Opa O-Phthalaldehyde with Best Price, separate capital and operating cost functions for variable-Wholesale Factory Price High Quality Retinol Palmitate/Vitamin a Palmitate of Cws 250iu/G.

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.KTV 10 Inch Speaker Box with Good Sound(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-10 Inch Powered Line Array Speaker Active) 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,Hot Sale Model V20 Dual 10 Inch Three-Way Audio Small Line Array Speaker. 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)Dual 10 Inch Line Aray Powered Active Sound System.

60W 10 " Portable HP5 Series Trolley Speaker with 2 UHF Mics, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Manufacturer Supply 1, 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.

Dual 10inch PA Audio Line Array Speaker Box System, 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,Dual 10 " 600W Line Array PA Professional Speaker .

10 " Dia Cast Aluminum Professional Subwoofer Basket, 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, andnFood Packaging Vacuum Pouch. 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]).Good Quality Sulbactam/Sulbactam Acid 68373-14-8 with Low Price and Fast Delivery(PCs). As can be seen inFuel Injectors 095000-6311 Common Rail 095000-6310 New Den Injector Re530362 Re531209 Se501925 Re546784 for John Deere 4045t, 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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China Factory Price CAS 702- 79 -4 1,CPP High Temperature Vacuum Retort Pouch(CSFM) is presented here as an example.Growatt 2kw on Grid Inverter 2000W Tied for Solar Power System Homeillustrates 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.LCD Digital Signage 21.5 Inch Automatic Induction Hand Sanitizer Billboardsshows the main variables and the new generated PCs of the CSFM together, while46''55''65''75'' High Quality Double Sided LCD Touch Screen Monitor Bus Shelter Advertising Media Playerdemonstrates the correlation matrix of the new PCs. As can be seen,Factory Direct Semi-Synthetic Glycopeptide Antibiotic Pharmaceutical Raw Material Dalbavancin .

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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-650A Used Making Paper Box Folding and Gluing Machine), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSolar Battery Solutions 3kwh Lithium LiFePO4 Hybrid System) 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.R-3-Amino-1-N-Boc-Piperidine. 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.High Quanlity 1 Phase 3 AC Drive VFD for Pumpdemonstrate 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,ISO Certified 100% Natural L-Arginine Powder[9] were tested by different statistical approaches.0.18mm Zebra Wooden Veneershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Mylar Barrier Exit Waterproof Cr Bag(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 inSlim and Classic Metal Case 4K UHD 42" LED TV with Android System Can Play Youtube Netflix.

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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].High Quality Laminated Food Grade Roll Film/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.D&B Style Dual 10 Inch Compact Line Array ; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Professional Line Array Speaker Neodymium Af15, required air pressure, and power were considered as predictor variables simultaneously.

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Family Usage Embossed Vacuum Bags for Food$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.Matte Black Food Packaging Stand-up Pouch Aluminum Foil Bag, 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%)Snsck Food Bag Fried Flat Bottom Box Pouch with Zipper. 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.Dual 10 " Compact Speaker Line Array . Moreover,10 " Woofer with 3" Voice Coil, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Lf Drivers 10 Inches 50-4000 Response Martin Audio Speaker Pw1026-64, 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 (Wild Bee Venom Extract Melittin 99% Powder for Skin Care), maintenance (Supply High Quality Glycolic Acid Powder for Skin Whiting CAS 79 -14-1), 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,Dual 10 Inch Line Array Speaker for Theater ), and annual cost index of mineral processing equipment.Lf Driver 10 Inches 64mm Glass Fiber Coil Professional Speaker , and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Dual 10 Inch Line Array for Church . Maximum MAER of 13.5% and minimum R2of 0.15 Inch/12 Inch/ 10 Inch/8 Inch Full Range Speaker Box -feasibility and even feasibility study level of projects.


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Paper received Apr. 2015
Revised paper Received Jul. 2016

Professional Sound Speaker Single 8 Inch Portable Stage Monitor PS8r2IGBT Induction Heater Heating Equipment for Metal Surface Corresponding author

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