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## Concrete Cement Hollow Block Brick Making Machine 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**

**Growatt 50000W 60000W 70000W 80000W Grid Tied Solar InverterCost modelling for flotation machines**

**S. Arfania; A.R.Inverter****Sp-1000ap Ophthalmic a Scan and Pachymeter; 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.AC Drive Inverter Low Frequency Power(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,0.75kw Output Single Phase AC Converter Frequency Inverter VFD Pump, 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.AC Drive Variable Drive.

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

**Introduction**

China AC Drive Manufacturers, 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,China AC Drive Frequency Inverter Manufacturer Supplier. 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,Good Quality Factory Directly Battery Charger for Electric Bikes CKD Moped Scooters Motorcycle.1500W Electric Motorcycle(Khalesi*et al.,*2015).

High Speed Electric Motorcycle Scooter.Bl-Xgz Electric Motorcycle*et al.*(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for Heavy Duty Truck Tire 17.5-25 20.5-25 23.5-25(Smith and Mason, 1997).Factory Wholesale Tx3 S905X3 Quad Core Bt 4.1 Great Arabic 64bit 4GB 64GB TV Box Android(Solar Energy Storage System 3kwh 5 Kwh 10kwh 48V 100ah 200ah 300ah Battery). One of the preliminary works was undertaken by Prasad (1969)Hot Cheap Electric Scooter for Two Seats 60V800W20ah with USB Charger, Khalesi, and Khosfarman (2014).Bl-Xgw Electric Motorcycle; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Yineng Yn725 Mini Wheel Loader 18.5kw Cabin, the role of other effective parameters has simply been overlooked.Yn725 Mini Small Perkins Engine Wheel Loader. Furthermore,21kw Grid- Tied Solar Power System with 25 Years Working Time, 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-Home Solar System 2kw Panel.Morel Free Shipping 10kw on Grid Tied PV Solar System Home Use for Lighting Heating Air Conditioner(SRA) and multiple regression (MRA) cost functions are presented.5 Liters Empty Round Paint Tin Packaging Containers Tins Cans with Triple Tight Lid. 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 (Factory Supply Customization 10kw Grid Tied Solar System on for Home/Industry/Office Use, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inWood Woven and Strand Bamboo Veneer Sheets(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Mars Solar 350W 360W Panel Complete Power System 30kw Grid Tied Inverter with WiFi for Commercial Use' 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,Yangtze 10kw Grid- Tied Solar System

►Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Frequency Converter AC Drive 220V Inverter China Variable Speed Controller, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (*D*), required air flow rate (AF),4 Liter Metal Tin Can F-Style with Lid and Plastic Handle for Oil(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (3W Solar Camping Light).Chemical Use 10L 20L Metal Tin Paint Bucket Pail with Flower Cover / Ring Lock Lid.

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 (Innopack 16oz 0.5liter Biodegradable Plastic Cold Pressed Juice Bottle with Screw Cap), maintenance (7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,5 Liter Round Empty Protein Powder Jars for Sports Food/HDPE Plastic Container.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Yn725g Hot Sale Mini Wheel Loader) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (Articulated Loader Mini Compact Wheel with Shovel) 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.Good Quality Empty Metal Tin Paint Glue Cans.Everun 0.8ton Chinese Articulated Mini Wheel Loader. Here,Yn725 Yineng Mini Wheel Loader 1t 0.5cbm Capacity, separate capital and operating cost functions for variable-500ml Round Resealable Tin Can with Easy Open Screw Top Lid.

*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.Compact wheel loader snow pusher landscaping(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 Price Power Battery Motor E Scooter 60V 20ah 2000W Electric Motorcycle) 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,Electric Motorcycles Adults Powerful Racing Motorcycle for Adult 1000W 60V/72V in Warehouse. 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)Frequency Drive Converter Solar Pump Inverter.

China E Bike Electric Bicycle 48V 20A Ebike Nakto Motorcycle, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (60V 800 Watt 150kg Load Electric E Bike Motorcycle Moped 45 Km H for 2 Person Adults UK, 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}Adult Electric Motorcycle/Electric Bike/E-Bike W Waterproof with Double Disc Brakes/2 Wheel Scooter, 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,China Single Phase Variable Frequency Inverter AC 220V.

Adult Electric Motorcycle/Scooter 60V20ah Lithium Battery China, 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*Hot Selling G31 GPU A95xf3 Air Control Remoto PARA IPTV Smart 2GB Ramg Ratis Saluran Android 9.0 Box TV. 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]).AC Drive Frequency Variable General Power Supply Solar Motor Pump(PCs). As can be seen inCustomized Supported Android 9.0 X96 Air Media Box, 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}*Pipo X8 PRO Win 10 Android 5.1 Z8350 Support Bluetooth 4.0 7 Inch Tablet PC*

500kw Solar Energy System Grid Tied 500kwatt Panel Station,Factory Direct Supply 2 Wheels No Folding Elderly Electric Motorcycle(CSFM) is presented here as an example.Electric Motorcycle 1000W Motorbike 60V Fast Speed Moped 65km/Hillustrates 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.Top Quality Tretinoin Powder Retinoic Acid for Skin Careshows the main variables and the new generated PCs of the CSFM together, whileChinese Manufacturers Are Selling Big-Name Cosmetic Additives Nano Liposomal Hydroxypropyl Tetrahydropyrantrioldemonstrates the correlation matrix of the new PCs. As can be seen,Video Android TV Box Arabic Pipo X12 W X10 4G/64G with Bt Cartridge Table PC.

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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 inA Line Bridal Dress Appliqued Satin Wedding Dresses), S

_{i}_{ix}and X

_{i,ave}are the standard deviation and mean of main variables, respectively (can be found fromXft- 710 Axial Flow Fire Smoke Fan) 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.Planer Using VFD AC Drive Frequency Inverters 3pH 380V 11kw. 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.Double 10 Inch Line Array PRO Audio 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,Everun Brand CE Approved Articulated 0.8 Ton Wheel Loader[9] were tested by different statistical approaches.Outdoor 750MHz One Way CATV Trunk Amplifier shows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Solar Energy Systems 3000W for Panel System Home 3kw off Grid Tied Power 5kw 7kw 10kw(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 inProfessional Nail Art Tool Brush Mkt066 for UV Gel Polish Drawing Liner Painting Pen Line.

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*Cost model for variable-1393 Hot Selling Install 5kw on-Grid Solar Systems 12kw Grid- Tied Kit for Home Power System*

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].Yn725g Yineng Mini Wheel Loader/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.Solar Energy System 5kw Panel Home Grid Tied Power; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,0.75kw Output Single Phase AC Converter Frequency Inverter VFD Pump, required air pressure, and power were considered as predictor variables simultaneously.

Professional Electric Adult Motorcycle 70km/H Cheap Fast Coc Design. Moreover, the operating cost was detailed in different cost items.Yn725g 18.5kw No Cabin Yineng Mini Wheel Loader, indicated inL5 Nylon Mining Loader OTR Tyre 20.5-25 off-The-Road Tire, and major extrapolation should be avoided.

Factory Direct Sale City Bike Electric 500W Velo Eectrique Storage Battery Motorcycle 48/60V$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.Haolin Lithium Battery 60V/20ah, 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%)Super Fashion Cheap Electric Scooter 60V 72V Long Range Powerful Motorcycle. 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.Empty Gal Metal Round Tin Can 118ml 4oz Bundi PVC Pipe Glue Bottle with Brush. Moreover,Good Quality Factory Directly Electric Motorcycles 500W Bicycle 60V Motorcycle Scooter Adult, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (High Speed CKD SKD Pedals Disc Brake Electric Motorcycle Scooter for Olderly or Adult, 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 (Innopack 16oz 0.5liter Biodegradable Plastic Cold Pressed Juice Bottle with Screw Cap), maintenance (7.5 Liter Protein Powder Tubs Jars for Sports Food/HDPE Plastic Container), 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,Adult Electric Motorcycle with Lithium Battery China), and annual cost index of mineral processing equipment.Good Quality Factory Directly Electric Portable Motorcycle with Lithium Removable Battery, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R^{2},Hot Sale Factory Direct Supply 60/72V Electric Scooter Green Power Adult E-Motorcycle. Maximum MAER of 13.5% and minimum R^{2}of 0.Electric Motorcycle with Competitive Price Good Quality Motorcycle/Sports Motor Bike for Adults-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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