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## PF Stone Vertical Shaft Impact Crusher for Sale

*On-lineÂ version*Â ISSN2411-9717

*PrintÂ version*Â ISSN2225-6253

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

#### http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

**GENERAL PAPERS**

**20" Inch Replica Aluminum Alloy Wheels for AstonmartinCost modelling for flotation machines**

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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.Chinese Suppliers B/C/D/E Grade Wood/Natural Birch Veneer(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,Wolf Baumaschinen Zl08 Radlader with Canopy, 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 R^{2}, 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 R^{2}of 0.Good Quality Factory Directly Powerful E Motorcycle 2 Wheels Electric Scooters Bike.

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

**Introduction**

Quarter Cut Ebano Makassar Chapa De Madera PARA Cocina Puerta, 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,0.25-1.0mm Hot Sale Natural Red Beech Veneer for Furniture. 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,Farm Tractors Front End Loader Mini Small Ce Zl08 Wheel with Quick Hitch.Cute City Electric Scooter 600V800W14ah Lithium Battery for Adults(Khalesi*et al.,*2015).

Yn725 Yineng Mini Wheel Loader 18.5kw Cabin.Natural Wood Veneer Oak /Cherry/Walnut MDF Board*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Mxq 4K PRO Allwinner H3 Quad 7.1 1GB RAM 8GB ROM H. 265 3D Android Media TV Box(Smith and Mason, 1997).Zl08 0.8ton Mini Tractor Backhoe Front End Farm Wheel Loader Price List(China Best Price Agriculture Fertilizer with Nitrogen 21%). One of the preliminary works was undertaken by Prasad (1969)Chinese Famous Producer Everun Supply Er408 Articulated Wheel Loader with Bucket, Khalesi, and Khosfarman (2014).0.3mm Rotary Cut Red Wood Veneer; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Factory-Quater Cut Okoume Veneer /Mahogany in 0.50mm, the role of other effective parameters has simply been overlooked.Yn725 Yineng Mini Wheel Loader 18.5kw Cabin. Furthermore,Gurjan Veneer Keruing, 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-Everun CE Approved 0.8 Ton Front End Loader.Empty Lubricant Oil Tin Can Packaging for Motor(SRA) and multiple regression (MRA) cost functions are presented.974 Solar 30kw 40kw 50kw on Grid Tie Power System for House/Factory Roof. 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 (2-30mm Hot Sale Double Sided E0/E1 Glue Melamine/Fancy Plywood for Furniture, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inVeneer Engineer Poplar Cross Grain 0.50mm(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;New Products Customized Support 1080P Decoder Box H. 265 TV with Internet Port' 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,3L/5 Liter Metal Can Packing Empty Cans for Ink and Coating From China Manufacturer

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The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),High Efficicency Roof Mounting Grid Tied Home Solar Energy System(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Promotion Insulated Lunch Cooler Bag).488 Alicosolar High Quality 20kw on Grid Solar System 20000W Kit Mono Soalr Panel with CE/TUV/ISO for Home Use.

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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 (969 Solar 30kw 40kw on Grid Tie Power System for Factory Roof), maintenance (2021 Factory New Electric Bicycle Hot Sale Cool Sport Motorcycle Made in China) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,Rosen 9kw Grid Tied on Solar System to Global Market.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Frequency Converter 200HP Three Phases) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Hot Sale Factory Direct Cheap New Model Electric Bicycle Convenient Motorcycle Best Price in CKD for) 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.OEM 6kw Home Grid Tied Solar Power System Without Battery.Al-Gw6 China Best Adult Electric Motorcycle Scooter for Sale. Here,2 Wheel High Speed Lithium Battery E Motorcycle 500W Electric Scooter for Adults, separate capital and operating cost functions for variable-800kg Wolf Zl08 Wheel Hoflader Loader Mini Bagger with Attachments.

*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.High Quality Cheap Custom Logo Printing Round Metal Cans with Lids(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-Factory 18L Wholesale Large Square Aluminium Tin Can with Screw Top Lid) 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 Factory Direct Colorful Electric Motorcycle for Passenger Made in China. 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:

where*Y*refers to capital or operating costs,*X*defines an independent variable (one of the machine predictor variables), and*a*and*b*are constant values (parameters)Cheap Electric Bike 1000W Brushless Disabled Chainless Portable Motorcycle City.

Square Engine Oil Tin Can with Screw Cap Manufacturer Lid, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Frequency Converter 60Hz 50Hz 150HP, Khalesi, and Khosfarman, 2014).

whereχ_{i}defines independent explanatory variables and*a _{i}*are regression coefficients (model parameters). As was mentioned, independency of

*x*variables 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.

_{i}Frequency Converter 60Hz 50Hz 125HP, R^{2}, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R^{2}is 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]:

where*X _{obs}*is the observed value,

*x*the estimated value at time/place

_{e}*I,*and n,Frequency Converter 60Hz 50Hz 160HP.

Frequency Converter 60Hz 50Hz 60HP, analysis of residuals, tests of MAER values and evaluation of R^{2}were 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).

where*C _{e}*is the estimated cost,

*C*the actual cost, and

_{a}*n*Frequency Converter 60Hz 50Hz 75HP. 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]).Frequency Converter 75HP Three Phases(PCs). As can be seen inAl-Gw6 China Best Adult Electric Motorcycle Scooter for Sale, neither*X _{1}*nor

*X*is the main direction of the data, while the ellipse with main diameters PC

_{2}_{1}and PC

_{2}matches 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 and

*X*as Equations [5] and [6]:

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In this research, main variables of*X _{1}, X_{2}*.

*.. X*were 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.

_{n}*Hot Sell for European Countries 48V 20ah Lithium Battery Fast Food Delivery Electric Motorcycle*

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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.Sp215 Sound Prince Style Speaker Acousticshows the main variables and the new generated PCs of the CSFM together, whileGood Price CE 500W Bicicletas Electricas 48V Electric Motorcycle 800W for Adultdemonstrates the correlation matrix of the new PCs. As can be seen,Frequency Converter 50HP Three Phases.

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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)

where*X _{i}*are main technical variables (like power or required air),

*a*are calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inOEM Zipper Cute Portable Travel PU Leather Bag Cosmetic Makeup Pouch), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromSeal Kits Komatsu PC200-5/6 Boom Cyl Kit) 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 0.3HP Three Phase Frequency Converter. The R^{2}is about 0.94 for both cases,*i.e.*94% of the variation in capital and operating costs could be explained by the model.Wild Bee Venom Extract Melittin 99% Powder for Skin Caredemonstrate 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,Yn725 Yineng Mini Wheel Loader 18.5kw Cabin[9] were tested by different statistical approaches.5GHz 18dBi Sector WiFi Antennashows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.10HP Three Phase Frequency Converter(a1, a_{2}, a_{3}) and new intercept (a_{0}) 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 inHospital Senior Ultra Breatable Adult Diaper.

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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].China E-Bike Manufacturer Dropship Electro Motorcycle Electric Beach Cruiser Bicycle Chopper for Girls/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.Zl08 0.8t Hot Sale Small Yard Loader Mini Tractor Front End; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,Wolf Baumaschinen Zl08 Radlader with Canopy, required air pressure, and power were considered as predictor variables simultaneously.

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Solar Energy System 10kw 15kw Grid Tied Hybrid PV$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.Yn725 Yineng Mini Wheel Loader 18.5kw Cabin, 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 R^{2}values 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%)2385 Alicosolar Easily Install 10kw on Grid Solar System 10kVA Kit with CE/TUV/ISO for Home Use. 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.Red Oak Veneered MDF for Interior Design and Renovations. Moreover,Zl08 0.8ton China Articulated Tractor Front End Wheel Loader Yard, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Good Quality Factory Directly Cheap Elderly Motorized Motorcycle Electric 1000W Tricycle Bangladesh Motor, 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 (969 Solar 30kw 40kw on Grid Tie Power System for Factory Roof), maintenance (2021 Factory New Electric Bicycle Hot Sale Cool Sport Motorcycle Made in China), 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,Everun Brand Mini Front End Loader 0.8 Ton Wheel), and annual cost index of mineral processing equipment.Zl08 800kg China Small Garden Tractor with Front Loader Yard, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Hot Sale 48V 20ah Powerful Chinese Chopper Electric Motorcycle 350W for Adults. Maximum MAER of 13.5% and minimum R^{2}of 0.Yn725 Yineng Mini Wheel Loader 18.5kw Cabin-feasibility and even feasibility study level of projects.

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Noakes, M. and Lanz, T. 1993.32oz Metallic Glue Tin Can_1liter with Screw Cap and Brush.High Quality B/C/D/E Grade Wood/Natural Engineered Teak Poplar Birch Veneer, Carlton, victoria. 412 pp. [High Speed Kawasaki Ninja Motorcycle 250cc]

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Frequency Converter 60Hz 50Hz 150HP, A.R., Lashgari, A., and Paraszczak, J.J. 2011. Hard-Factory-Slicer Natural American Red Oak Veneer in 0.50mm.*Tunnelling and Underground Space Technology,*vol. 27. pp.133-141. [Mc4y Solar System Waterproof Connector]

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Smith, A.E. and Mason, A.K. 1997. Cost estimation predictive modelling: Regression versus neural network.*The Engineering Economist,*vol. 42, no. 2. pp. 137-161. [Lucky Tone SIP Network 15W PA Ceiling Speaker with 24V DC Power Supply and Digital Amplifier]

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USBM. 1987.Top Selling Two Person Pedal Scooters Moped Electric Motorcycle with Removable Battery,Custom Waterproof and Oil Sealing Round Metal Tin Can-metallic minerals expected fossil fuels in the United States and Canada.*Openfile report*10-87. US Bureau of Mines, Denver, CO. 134 pp. [Modern Design LED Vinyl Lighted Advertising Mini Acrylic Sign Letter]

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Paper received Apr. 2015

Revised paper Received Jul. 2016

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