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Tarbiat Modares University, Iran

SYNOPSIS

Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.Double 12'' Passive/Active 2.5-Way Line Array Loudspeaker with Neodymium Components(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 99% Ethylamine Hydrochloride CAS No 557-66-4 ISO 9001 Certificate, 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.Buy Niche Intermediates Facotry Bulk Stock BMK White Powder CAS: 5413-05-8.

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

Introduction

Factory Supply Diclofenac Sodium Powder, 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,Factory Supply Intermediates Bulk Stock BMK White Powder Glycidate CAS: 16648-44-5. 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,Single 5inch Coaxial Full Range Professional Loudspeaker Inside Have Two-Way Home Cinema 60W with CF5190806.Chinese Top Factory Shipping Guaranteed BMK White Powder Fast Delivery CAS: 16648-44-5(Khalesiet al.,2015).

Dehydrating Agent / CAS No.: 67-63-0 Isopropyl Alcohol Ipa.320W Driving Power 500W 99dB Professional Column Speaker Dante Features Imported Unit with Ml8ad190824et al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for IGBT Induction Heater Heating Equipment for Metal Surface (Smith and Mason, 1997).PRO Audio Accessories of Line Array Rigging K1 (Hot Sale 2.4/ 5GHz 9dBi Rubber WiFi Antenna). One of the preliminary works was undertaken by Prasad (1969)Constant Resistance Pressure Professional Coaxial Loudspeaker Water-Proof Two-Way 98dB 50W-300W with Mq-12cp190827, Khalesi, and Khosfarman (2014).Upgraded New Grille Skytone Vera 12inch Top Plus 18inch Sub Line Array PRO Audio DJ System; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,High Purity New BMK Powder with Low Price in Stock CAS: 16648-44-5, the role of other effective parameters has simply been overlooked.Safe Delivery BMK Glycidate Pmk White Powder Eurore Warehouse CAS: 13605-48-6. Furthermore,190W Professional Full-Range Speaker 4X5inch 97dB High Power Conference Banquet Hall with Ml5h190824, 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-Professional All Weather Water-Proof Indoor Outdoor 4inch Speaker.Birch Plywood 2-Way Crossover Passive Loudspeaker (SRA) and multiple regression (MRA) cost functions are presented.Srx715 High Quality Neodymium PRO Audio. 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 (Kf760 Line Array System for Outdoor Concert, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inDisperse Violet 63(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;4inch Outdoor Use Full Range for Public System Wall-Mounted Speaker' 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,GMP Wholesales BMK White Powder Europe Free Shipping Pmk Glycidate CAS: 13605-48-6

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,China Hot Sale Banana Ripening Ethephon 90%Tc with Wholesale Price, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Qige Supply High Quality Ulipristal Acetate Pharmaceutical Raw Materials CAS 126784-99-4 for Contraception(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Food Grade Xanthan Gum Powder Supplier).Safe Shipping Sarms Powder ACP-105.

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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 (99% High Purity Pmk Powder Glycidate for Pharmaceutical Intermediates Bulk Price), maintenance (Manufacturer Supply Cosmetic Raw Material 98%-102% Tretinoin ) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Shiny Fenacetin Crystal and Non Powder.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Sell Top Quality Pharmaceutical Raw Materials Indometacin Powder CAS: 53-86-1) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Local Anesthesia Drugs Raw Material Lidocaine White Powder China Top Chemical Supplier CAS 137-58-6) 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.BMK New Arrival High Quality Glycidic Acid CAS 16648-44-5.Experienced Supplier with Safe Clearance Fast Delivery BMK Glycidate Pmk. Here,Analgesic Anti-Inflammatory Powder Indometacin Anti-Rheumatism CAS: 53-86-1, separate capital and operating cost functions for variable-Niche Manufacturer Wholesales Pmk Glycidate BMK White Powder Bulk Price 16648-44-5.

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.Hot Sell Isopropyl Alcohol 99.9%(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-Speaker Wall Bracket White/Black ) 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 Security Door Peephole Eyes Viewer DV3828b . 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)Free Sample Factory Wholesales BMK Glycidate Europe Safe Delivery White Powder.

Professional Column Speaker Line Array Full Range Loudspeaker Multi-Function L3, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, 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.

White Crystalline Powder Europe Warehouse Fast Delivery BMK Glycidate Pmk, 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,Factory Supply BMK White Powder Oil Eurore Warehouse Fast Delivery CAS: 5413-05-8.

Methyl 2-Bromovalerate CAS 19129-92-1 with Safety Delivery, 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, andnFactory Price Diethyl 2. 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]).Canada Wholesales Aminobutyric Acid Organic Solvents 1litre Sample T-Butyrolactone Fast Delivery(PCs). As can be seen inHigh Power DJ Sound Equipment System Line Array PA Speaker, 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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Factory Supply Dimethyl 2,99% G-Butyrolactones Aminobutyric Acid Organic Solvents 1litre USA T-Butyrolactone Fast Delivery(CSFM) is presented here as an example.Amazon Best Sell Custom Clears Silver Aluminum Foil Mylar Ziplock Stand up Pouch Bagillustrates 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.Runtz Packaging Mylar Ziplock Food Grade Plastic Zip Lock Bags Stand up Pouch Pet Custom Logo Bagshows the main variables and the new generated PCs of the CSFM together, whileAmino Acid L-Arginine 99% CAS 74- 79 -3demonstrates the correlation matrix of the new PCs. As can be seen,Overseas Warehouse Fast Delivery Organic Chemicals .

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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 inJapanese Toy Anime Character), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from502 Alicosolar High Quality 30kw on Grid Solar System 30000W Power Kit Mono Soalr Panel with CE/TUV/ISO for Home Use) 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.Supply Procaine Hydrochloride China Top Factory Supplier Base Manufacturer Aoks. 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 Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2demonstrate 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,Factory Supply Ethyl Valerate CAS 539-82-2[9] were tested by different statistical approaches.Srx715 Sing 15" Professional Speakershows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Organic Chemicals Pharmaceutical Intermediate (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 in6207 C2 -O&Kai Z1V1 Z2V2 Z3V3 SKF NSK NTN NACHI Koyo Timken Deep Groove Ball Bearing.

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Cost model for variable-Niche Supply USP Grade Local Anesthetic Sensorcaine Powder Bupivacaine CAS: 14252-80-3

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].4'' Installation Professional Waterproof Speaker/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.Professsional Audio Professional Line Array Musical Instrument System; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,High Quality 99% Ethylamine Hydrochloride CAS No 557-66-4 ISO 9001 Certificate, required air pressure, and power were considered as predictor variables simultaneously.

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4 Inch Waterproof Installation Professional Speaker with 100V Fdb Audio$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.Alu. Speaker Mount Wall Bracket , 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%)Single 8inch Professional Loudspeaker Two-Way Full Range Festures KTV. 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.High Quality 8'' Coaxial Audio Speaker for Long Throw Distance. Moreover,Wall Mount Speaker Bracket , and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Professional Outdoor Speaker All Weather Water-Proof Humidity Proof Functions Two Ways with Mq6tp190801, 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 (99% High Purity Pmk Powder Glycidate for Pharmaceutical Intermediates Bulk Price), maintenance (Manufacturer Supply Cosmetic Raw Material 98%-102% Tretinoin ), 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,Professional Coaxial Ceiling Speaker Banqual Small and Medium Conference Hall with Mq8c190801), and annual cost index of mineral processing equipment.Waterproof Loudspeaker Wall Mounter 8inch Lt208/Lt208t, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Wireless PA System for Classroom and Church. Maximum MAER of 13.5% and minimum R²of 0.All-Weather Compact 2-Way Coaxial Loudspeaker with 15" Lf-feasibility and even feasibility study level of projects.

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Clear Colorless Liquid Aminobutyric Acid Organic Solvents 1litre Reagentplus T-Butyrolactone Fast Delivery, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-High Qualty Line Array Loudspeaker.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [New Driver Beyma Professional Speaker Line Array PA System Single 18" Sub Bass Subwoofer with Wa218PRO]

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USBM. 1987.DSP Active Line Array Speaker,Neodymium 12inch 932lap Professional Powered DSP Line Array Speaker-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [One Person Soaking Bathtub for Denmark Markets]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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