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SYNOPSIS

Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.L-812 Dual 12-Inch 2-Way 4-Unit Full Frequency Line Array Speaker(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,100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4, 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 Purity Levamisole Manufacturer CAS 14769-73-4 with Best Price.

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

Introduction

Free Sample Organic Chemicals 1, 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 Phena. 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,Manufacturer Supply Raw Material Levamisole Powder CAS 14769-73-4.18" Fane Style Aluminum Speaker Frame(Khalesiet al.,2015).

18" Die Cast P-Auido Style Aluminum Frame.Professional Stage Active Line Array Speaker with DSPet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Farwell P-Hydroxy Benzaldehyde with High Purity 99.5%(Smith and Mason, 1997).Single 18" Subwoofer Speaker Box(High Toughness and Tensile Strength Resin 610). One of the preliminary works was undertaken by Prasad (1969)Wholesales Veterinary Drugs Tiletamine HCl 14176-50-2 USA Warehouse, Khalesi, and Khosfarman (2014).12" Professional Rcf Style Speaker Frame; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Horn Professional Speaker H3, the role of other effective parameters has simply been overlooked.Coaxial Loudspeaker TD12. Furthermore,18'' Subwoofer Speaker Box Ls1200, 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-Dual 12" Subwoofer Speaker Box.DV Portable Speaker 12 Inch 1600W Subwoofer Box Audio Professional(SRA) and multiple regression (MRA) cost functions are presented.Fast Delivery 1. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.

Methodology

Data

Thirty-seven major flotation machines (Professional Speaker Box F12+, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inPharmaceutical Raw Powder Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Df B&C Trees Speaker Subwoofer Audio Professional' 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,Manufacturer Supply Bdo Novel Intermediate 1

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Tetracaina HCl Tetracaine Base Depuracao Segura Mercado 100% Brasileiro, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),99% Pain Reliever Local Anesthetic Powder Tetracaine CAS 94-24-6(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (White/Grey/Copper/Black Aluminium with Acrylic Diffuser Dining Lamp Modern).China Factoty Supply Levamisole HCl CAS16595-80-5 Hydrochloride Tetramisole.

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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 (400 Watt Portable Music Player Speaker Professional Audio), maintenance (Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Dm 15 Inch PA Full Sound Systems Professional PRO Speaker.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (12inch KTV Bar PA Full Sound Speaker System Audio) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Dare Dual 8" Neodymium Active Line Array Set PA System) 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.12" Die Cast Aluminum PA Speaker Frame.PA Speaker Dual 18" Subwoofer System. Here,PA Speaker with Line Array Tweeter Horn , separate capital and operating cost functions for variable-Active Mini Line Array Speaker with DSP Amplifier Module.

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.Quality Certified Product Ethyl 2-Phenylacetoacetate CAS: 5413-05-8 BMK Powder(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-High Quality Karaoke Loudspeaker with B&C Compression Driver) 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,99% Tetracaine Hydrochloride/ HCl Powder CAS 136-47-0. 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)Factory Supply BMK Powder Glycidate CAS: 5413-05-8.

China Factory Supply CAS 99-93-4 4-Hydroxyacetophenone, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Chinese Manufacturer Bulk Stock Pmk Intermediates16648-44-5 BMK White Powder, Khalesi, and Khosfarman, 2014).

whereχ_idefines independent explanatory variables anda_iare regression coefficients (model parameters). As was mentioned, independency ofx_ivariables 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.

99.9% High Purity Prilocaine Hydrochloride/Prilocaine HCl CAS 1786-81-8, 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]:

whereX_obsis the observed value,x_ethe estimated value at time/placeI,and n,High Quality 4'-Hydroxyacetophenone CAS 99-93-4 4-Hydroxyacetophenone with Best Price.

Factory Bulk Stock Pmk Intermediates BMK White Powder CAS: 16648-44-5, 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).

whereC_eis the estimated cost,C_athe actual cost, andn99% BMK White Powder Glycidate Bulk Sales CAS: 16648-44-5. 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]).99% 4'-Hydroxyacetophenone CAS 99-93-4 100% Pass Customs(PCs). As can be seen inCarb Grade 18mm Commercial Plywood, 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 andX_ias Equations [5] and [6]:

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In this research, main variables ofX₁, X₂... X_nwere 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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Quality Guaranteed BMK White Powder CAS: 16648-44-5 Glycidate,Hair Loss Treatment Acetyl Tetrapeptide-3/Capixyl CAS 827306-88-7 Purity Min 99% Powder(CSFM) is presented here as an example.PE Dog Food Pouch with Holeillustrates 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.Chinese Suppliers Okoume Wood Face Veneer for Malaysiashows the main variables and the new generated PCs of the CSFM together, whilePendoo X10 Max International Best Custom Set Top Box 4GB 32GB TV Converter Ott 4K Smart Androiddemonstrates the correlation matrix of the new PCs. As can be seen,100% Passing The Customs Europe Free Shipping BMK Glycidate 16648-44-5.

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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)

whereX_iare main technical variables (like power or required air),a_iare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inASTM 1045 Scm420 SCR440 Low alloy steel plate), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromQuilted Fabric Sofa Couch Bed Set Armchear Furniture) 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.BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6. 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.99% High Purity Tiletamine Xylazine Veterinary Anesthetic CAS: 14176-50-2 HCldemonstrate 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,Portable 15inch PA Speaker F15+[9] were tested by different statistical approaches.Ophthalmic Pachymeter shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Pharmaceutical Chemical CAS 236117-38-7(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 inFace Mask 3 Ply Disposable Medical Non-Woven Fabric in Stock for Hospital.

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Cost model for variable-Speaker 12 Inch SA-212 Professional Sound Box Portable Passive

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].Speaker Tcx- 10/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.

Discussion

Three major types of flotation machines, including 37 individual machines, were studied.PA Woofer Speaker T- 10 12 15; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,100% Safe Arriving Australia GB-B L 1.4 Butanediol Bdo 110-63-4, required air pressure, and power were considered as predictor variables simultaneously.

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10 " PRO Audio DJ Line Array Speaker Equipment System$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.Wholesale Factory Price CAS: 16648-44-5 BMK Glycidate Powder, 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%)Buy Real Pharmaceutical Intermediates BMK Glycidate Powder 16648-44-5. In the MRA cases, this property is owed to the SFM (3.05%).

Conclusion

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.10 " PRO Sound PA Line Array Loudspeaker Audio Speaker System. Moreover,Big Outdoor Sound Equipment Active Dual 8" Line Array Speaker, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Powered Line Array Selfpowered Speakers Active System, 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 (400 Watt Portable Music Player Speaker Professional Audio), maintenance (Dual 6inch Loudspeaker for Coffee Room Restaurant Conference Speakers), 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,MBN1503 PA Woofer ), and annual cost index of mineral processing equipment.Best Quality BMK Glycidate Raw Materials Fororganic Intermediates Bulk Price, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Self Powered Generator Double 8 Inch Outdoor Sound Indoor Line Array. Maximum MAER of 13.5% and minimum R²of 0.Light and Durable Mixing Console Mg124cx Audio Mixer-feasibility and even feasibility study level of projects.

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Noakes, M. and Lanz, T. 1993.Pain Relleving Patch Topical Lidocaine Spray137-58-6 UK Warehouse Free Sample.Kas DJ Speaker Dual Line Array 18 Inch Subwoofer, Carlton, victoria. 412 pp.         [Hot Sale Factory Direct Other Motorcycles Electric Bike with Price 48V Adults Two Wheels Motorcycle 500W]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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