GENERAL PAPERS

99 Purity Peptides Oxytocin Injection Acetate 2mgCost modelling for flotation machines

S. Arfania; A.R.LG LD550DUN-TKB1 video wall system with matrix switcherSet Top Box T95q S905X2 4G 32g Android 9.0 HD TV Kodi Quad Core; M.R. Khalesi

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.Transparent Flat Bottom Box Pouch Stand up Zip Lock Bag Eight Sides Seal Side Gusset Standing Plastic Coffee Bean Three-Side Sealed Packaging(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,Transparent Flat Bottom Box Pouch Stand up Zip Lock Eight Sides Seal Bag Side Gusset Standing Plastic Clear Coffee Bags Manufacturer Reusable PE Pet Food, 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.Laser Aluminum Resealable Value Pack Stand up Zip Lock Bag Hologram Self Seal Zipper Plastic Sealing Digital Food Packaging Mylar Paper Glossy.

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

Introduction

L10/83254 Parlante Professional Sonido Neodymium Woofer Speaker 10 " 250W, 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,Prfessional Audio 10''karaoke Loudspeaker. 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,10 Inch KTV System Woofer.Cheap Recycled Brown Kraft Paper Bag with Window 7&Slider Different Capacities Ziplock Manufacturer Heat Sealable Food Storage Doypack Packaging Container(Khalesiet al.,2015).

Laminated Food Packaging Bag Aluminum Coffee Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Barrier Bean Container.10 Inch Compact Line Array PRO Audioet al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for ISO Certificated Company Supply Skin Whitening Retinoic Acid Powder(Smith and Mason, 1997).10 Inch Indoor Outdoor Professional Loudspeaker(Zl08 0.8 Ton Agricultural Farm Articulated Mini Wheel Loader with Hydraulic System). One of the preliminary works was undertaken by Prasad (1969)99% Assay High Purity Miriplatin Pharmaceutical Chemical Powder with 141977- 79 -9, Khalesi, and Khosfarman (2014).Double 10inch Line Array Speaker Q1+Q Sub with Neodymium Magnet; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag High Quality Matte Surface Aluminum Foil Stand up Body Scrub, the role of other effective parameters has simply been overlooked.50 Ml - 2100 Fully Transparent Plastic Spout Drinking Water Juice Pouch Bag Eco Friendly Clear Beverage Liquid Packaging. Furthermore,Hot Selling Best Price 15307- 79 -6 Diclofenac Sodium Powder, 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-RC Factory Supply Chemcial Disodium Glycyrrhetate Powder with CAS 71277- 79 -7 as Food Additives.Thiosemicarbazide CAS 79 -19-6(SRA) and multiple regression (MRA) cost functions are presented.O-Phthalaldehyde CAS 643- 79 -8. 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 (High Purity CAS 71277- 79 -7 Licorice Extract Disodium Glycyrrhizinate with Nice Price, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inK2 Line Array Rigging Horn Metal Grill Waveguide Flare Sets (InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;PRO Audio 2-Way Dual 10inch Line Array System Q1+Q Sub' names:

►Pharmaceutical Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory Painkillers: based on 36-foot,1-Bromo-3,Low Price 4,High Purity CAS 64318- 79 -2 Gemeprost, and level control

►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,Ziplock Dog Food Bag with Bottom Gusset

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,High Quality Glycolic Acid/ Hydroxyacetic Acid CAS 79 -14-1, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Custom Printed Food Grade Ziplock Packing Bag(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Chinese Famous Brand Shantui Bulldozer SD16).Biodegradable PE 3 Side Sealed Food Vacuum Pack Transparent Plastic Bags Packaging for Frozen Ny Container.

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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 (Laminated for Coffee Foil Cookie Food Packaging Bag Aluminum Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Container), maintenance (Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Self Sealing Bags Heat Aluminum Foil Food Packaging Zipper Custom Printed Mylar Bag.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (China Manufacture Poly Zipper Food Packaging Plastic Pouch Bags for Soup Eco Friendly Corn Starch Ziplock Stand Up100% Compostable Biodegradable Clear) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (10 Active Full Range Stage Sound Loud Speaker System Audio) 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.Two Way 10 " Mini Portable PRO Audio Active Loudspeaker PS10.Outdoors Professional/PRO Audio Speaker . Here,Dual 10 " Two Way PA Power Line Array Speaker, separate capital and operating cost functions for variable-Professional Speaker System Single 10 Inch 300W Mini Stage Monitor PS10r2.

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.Single 10'' Two Way Line Array PRO Audio(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-Double 10 Inch Line Array PRO Audio ) 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,Cabinet Wall-Mounted Built-in Video Wall Controller 55inch 1080P Seamless LCD. 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)Samsung 55inch Ultra Thin 1.7mm 700 Brightness 2X3 3X3 Video Wall Solution.

Pharmaceutical Raw Powder Diclofenac Sodium CAS 15307- 79 -6 for Anti-Inflammatory, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Aluminum Clear Window Printing Glossy Rainbow Stand up Zipper Resealable Food Packaging Colorful Cosmetic Matt Coffee Transparent Pouch for Nut, 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.

High Quality Oxytetracycline Powder 100% CAS 79 -57-2, 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,CAS: 79 -44-7; Dimethylcarbamoyl Chloride;.

Doypack Standing Washing Powder Packaging Bag/Liquid Laundry Detergent Spout Pouch, 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, andn200X5000mm Vacuum Sealer Bag Roll for Food Packaging. 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]).Factory Design Logo Food Grade Colourful Printing Sealed Stand up Scented Tea Packaging Bag(PCs). As can be seen inChina High Quality Ut-O100 Ophthalmic Pachymeter Ultrasound Scanner for Eye, 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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Pet/PE/CPP Ziplock Plastic Clear Nut Package Dry Food Grade Bags,Hot Sales 2/3 Sides Seal Food Vacuum Pouches 70micron(CSFM) is presented here as an example.Boring Machine Tools Micro Head F1type CNC Heads Setillustrates 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.Rg-Ap3220 Dual Band and Radio 5.8g Wireless Poe Access Point / Apshows the main variables and the new generated PCs of the CSFM together, while381323 80mAh 3.7V Battery for Earphone Campact Lithium Polymerdemonstrates the correlation matrix of the new PCs. As can be seen,Heat Seal Moisture Proof Cbd Gummies Plastic Food Packaging Candy Bag.

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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 inGlass Perfume Bottle with Pump Sprayer), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found fromSingle 15inch Two Ways Full Range Loudspeaker Perfessional PA System Disco Event 450W with Ks15190802) 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.Professional Sound Speaker System Single 10 Inch Mini Passive Line Array Vr10. 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.Industry Saveing Box demonstrate 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,Professional Audio Speaker Single 10 Inch 300W Portable Stage Monitor PS10r2[9] were tested by different statistical approaches.High Quality Gentisic Acid CAS No.: 490- 79 -9 with Fast Deliveryshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.D&B Q1 Style Dual 10 Inch Professional Speaker (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 inDelivery Clothes Packaging Shipping Poly Mailer Bags.

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Cost model for variable-Professional Audio Speaker System Single 10 Inch Portable Mini Line Array Vr10

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].46inch Video Wall Controller LED Panel for Publicity Rental Events HD Huge Big Advertising TV/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.10'' Neodymium Woofer Professional Loudspeaker with Brown Cone.; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Transparent Flat Bottom Box Pouch Stand up Zip Lock Eight Sides Seal Bag Side Gusset Standing Plastic Clear Coffee Bags Manufacturer Reusable PE Pet Food, required air pressure, and power were considered as predictor variables simultaneously.

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Aluminum Foil Plastic Papacking Vacuum Puffed Food Bag$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 0.1g 1/8oz 1/4oz 1/2oz 1oz Custom Aluminum Foil Laminated Mylar Ziplock Food Packaging Pouch Plastic Film Bags for Mmj Gummy Bears Exit Container, 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 bright Samsung 46" 49" 55" LCD video wall screen monitor. 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.Factory Sell 99% Purity Diclofenac Sodium Powder CAS 15307- 79 -6. Moreover,43''46''55''65''75'' Commercial LCD Screen Display Full Color Waterproof Sunglight Readable Android Touch Monitor Kiosk, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Kraft Paper &Plastic Foil Laminated Mylar Food Packaging Container, 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 (Laminated for Coffee Foil Cookie Food Packaging Bag Aluminum Stand up Pouch Manufacturer Custom-Made Self-Sealing Plastic Mylar Zipper Exit Container), maintenance (Plastic Customized Gift Zip Lock Garment Packaging Bag Composite Aluminum Foil Custom Food Packing Cookie), 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,10 Inch Active Stage Monitor PA Audio Speaker System for Line Array Subwoofer Live Show ), and annual cost index of mineral processing equipment.Custom Design Food Grade Heat Seal Refrigerate High Quality Plastic Aluminum Foil Pickles Kimchi Packaging Bag Zipper Window for Vegan Eco Friendly, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Bloom Tech Chemical Reagent . Maximum MAER of 13.5% and minimum R²of 0.BPA Free Customize Printing Plastic Laminated Mylar Bio Bag with Ziplock-feasibility and even feasibility study level of projects.

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Prasad, L. 1969.LG 46" 49" 55" DVI LED video panel for monitoring.Retinoic Acid CAS No. 302- 79 -4, Metallurgy and Petroleum, Montreal. pp. 3-15.         [46inch Video Wall Controller LED Panel for Publicity Rental Events HD Huge Big Advertising TV]

Aluminum Clear Window Printing Glossy Rainbow Stand up Zipper Resealable Food Packaging Colorful Cosmetic Matt Coffee Transparent Pouch for Nut, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Customized Printed 3.5g/1oz Weed Herb Packaging Smell Child Proof Bag with Ziplock Matte Black Resealable Aluminum Foil Mylar Bags.Tunnelling and Underground Space Technology,vol. 27. pp.133-141.         [Motorcycle Tires/Motorcycle Tyre/Tire 2.50- 17 2.50-18 2.75- 2.75-18]

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USBM. 1987.Resealable Matte Black Polyethylene Doypack Food Packaging Zipper Stand up Bags,Doypack Resealable Ziplock Black Aluminum Foil Standing up Pouches Food Packaging Bags with Zipper Ca/Hemp Bag-metallic minerals expected fossil fuels in the United States and Canada.Openfile report10-87. US Bureau of Mines, Denver, CO. 134 pp.         [Daier Digital DC Voltmeter Ammeter Lamp 12V 24V Socket]

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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