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Komatsu Boom Cyl Ket for PC300-5Cost modelling for flotation machines

S. Arfania; A.R.2021 Chemical Titanium Dioxide Pharmaceutical Intermediate CAS 13463-67-7Mini Private Design Tws True Wireless Stereo Headphone for Huawei; 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.Raw Material Benzocaine Powder CAS 94-09-7 Pain Killer Factory(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,80%-90% Lactic Acid CAS 598-82-3 L-Lactic, 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.PRO Audio PA Speaker .

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

Introduction

Top Quality Tretinoin Powder  Retinoic Acid for Skin Care, 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,TCP/IP Network Poe 15W Active Wall Mount Speaker Waterproof. 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,High Quality Skin Care Tretinoin Powder with Best Price.Professional Speker System 12 Inch PA Line Array Audio S1210(Khalesiet al.,2015).

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Methodology

Data

Thirty-seven major flotation machines (CAS16830-15-2 Gotu Kola Extract Centella Asiatica Powder Cosmetic Ingredient Asiaticoside, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inISO(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Blended Powder Oil Liquid Ripex 225 for Muscle Growth' 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,Xylazine Hydrochloride / HCl CAS 23076-35-9 for Antinociceptive

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Bulksupplement Vitamin a Acetate 0.5miu Ws Feed Grade CAS No 127-47-9, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Low Price Malonic Acid / Propanedioic CAS 141-82-2(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (High Performance Nu2209).2 Way Active Full Range Speaker Mini Portable Powered Loudspeaker.

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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 (L-Arginine Nutritional Supplements  Arginine  Flavoring Agents), maintenance (Indoor DJ Stage Two Way Active Line Array Cabinet Box) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,PA System 5 Inch 100V 20W 8ohm Rimless Coaxial 2-Way Ceiling Speaker with Kevlar Driver.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (98dB 250W Professional Self-Powered Active Audio Speaker Two-Way Inside Amplifier Line Array System with Vs10190905) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Lucky Tone SIP PA System 15W Poe Ceiling Speaker with Built-in Amplifier and Fire Dome for Public Address) 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.Glycine Methyl Ester Hydrochloride .Isoquinoline-5-Sulphonyl Chloride Hydrochloride CAS 105627- 79 -0. Here,Vitamin a Palmitate 1.0m, separate capital and operating cost functions for variable-High Purity 99% Oxalyl Chloride with Good Quality.

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.2-Cyclohexylethanol (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-L-Pyroglutamic Acid) 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,Reliable Supplier of Chlorphenesin/104-29-0 with Best Price in Stock! !. 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)Vitamin a Palmitate Powder 500 Cws-Gfp.

L-Pyroglutamic Acid, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (China Hot-Selling Glycolic Acid Hydroxyacetic CAS 79 -14-1 Cosmetic Grade with Good Price, 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.

Supply High Purity Oxalyl Chloride CAS: 79 -37-8, 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,Fatory Supply Thiosemicarbazide CAS 79 -19-6.

High Quality Retinoic Acid , 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, andnHigh Quality 98% Tretinoin . 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]).Selling Dibucaine Hydrochloride/Dibucaine HCl CAS 61-12-1 with Best Price(PCs). As can be seen inMars Solar 30000 W PV System Grid Tied Inverter 30000W Easy Install 30kw on Price, 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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Pharmaceutical 1% Huperzine a Powder Novel Treatment Alzheimer's Drugs CAS: 120786-18-7 Canada Sample Free,Rifamycin S 96% CAS: 13553- 79 -2(CSFM) is presented here as an example.Dare 10inch Passive Line Array Sound Systemillustrates 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.Single 10 Inch Active Speaker PS10r2 PA Systemshows the main variables and the new generated PCs of the CSFM together, whilePC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruderdemonstrates the correlation matrix of the new PCs. As can be seen,Professional Audio Speaker System Sing 8 Inch Mini Stage Monitor PS8r2.

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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 inZipper Beer Bottle Cooler Neoprene Stubby Holder), S_ixand X_i,aveare the standard deviation and mean of main variables, respectively (can be found from7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container) 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.Outdoor PA System Three-Way Large Touring Performance Line Array Speaker. 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.Food Packaging Vacuum Pouchdemonstrate 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,Plant Extract Huperzine a 1% Nootropics CAS: 102518- 79 -6[9] were tested by different statistical approaches.Inverter with Factory Price 3 Phase 60Hz to 50Hz 380V Variable Frequency Driveshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.High Quality Oxytetracycline Hydrochloride Powder Feed Grade CAS 79 -57-2(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 inWedding Dress Bridal.

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Cost model for variable-Lucky Tone SIP Network 15W PA Ceiling Speaker with 24V DC Power Supply and Digital Amplifier

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 Purity Amino Acid L-Arginine Powder/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.Potassium 2; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,80%-90% Lactic Acid CAS 598-82-3 L-Lactic, required air pressure, and power were considered as predictor variables simultaneously.

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Factory Supply Top Quality Cooling Agent Ws-3 CAS 39711- 79 -0$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.Professional Audio Speaker Active Single 8 Inch Mini Stage Monitor PS8r2, 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%)Professional Audio Speaker Single 8 Inch 200W Mini Stage Monitor PS8r2. 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.Professional Speaker System Single 15 Inch High Power Line Array Aw15. Moreover,PA Speaker Three-Way Large Touring Performance Line Array System PRO Audio, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Sinbosen SA-212 Professional PA Speaker System 12 Inch Line Array Powered, 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 (L-Arginine Nutritional Supplements  Arginine  Flavoring Agents), maintenance (Indoor DJ Stage Two Way Active Line Array Cabinet Box), 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,Hench Hot Sales Raw Material Powder Oxytetracycline), and annual cost index of mineral processing equipment.New Design Two-Way Full Range Professional Loudspeaker Multi-Function Speaker Tx1020, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R²,Natural Weight Loss Supplements Huperzine a Powder CAS: 120786-18-7 USA Hupa Sample Free. Maximum MAER of 13.5% and minimum R²of 0.Pharmaceutical Chemical Tretinoin Powder with Excllect Effect Safe Ship-feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

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