Calculation of Blending Efficiency for Base Mix Pile

(not verified)
Posted in: , on 22. Sep. 2007 - 14:02

Dear Sir,

I want to know what is the way of calculating of blending efficiency for single material such as iron ore fines or base mix pile using twin boom stacker & barrel type reclaimer ina pile volume of 300m *27m* 10.5m. Where input parameters are Fe,Sio2 considered.

With regards,

U. Goswami

Re: Calculation Of Blending Efficiency For Base Mix Pile

Posted on 26. Sep. 2007 - 05:40

Assessment of blending bed

For Assessing the homogenizing performance of a blending bed, following parameters will be considered. Four of these are introduced as estimated values of the statistical variance.

Sa: Overall variance of the input variations

Sb: Overall variance of the output variations

So: Variance of the output variations within the reclaimed slice. ( is very small)

Sx: Variance of the averages of the slices. (is very small for a good homogeneous pile)

Other Parameters are

N: the Number of Layers

T: the quantity of material per layer

t: the quantity of material per reclaimed slice

The homogenizing effect can be estimated in advance. For estimating the output variations the following relation is available:

Sx = Sa/Sq.Rt. of N

Theoretically, high homogenizing effects can be attained by making the number of layers large enough i.e. using very thin layers.

* Cement Engineers' Handbook Originated by Otto Labahn Fourth English Edition by B. Kohlhaas ISBN 3-7625-0975-1

In a iron ore pellet plant based on receipt of concentrate from two locations, a 40,000 T stckpile made by chevron stacking method required 400 layers for getting acceptable variance in Al2O3 & SiO2.

In a cement plant using neighbourhood limestone diposit with some variation in CaCO3 content, a 36000 T stockpile made by chevron stacking method required 90 layers for getting acceptable variance in CaCO3 content.

vinayak sathe 15, Rangavi Estate, Dabolim Airport 403801, Goa, India

Calculation Of Blending Efficiency

Posted on 20. Feb. 2008 - 05:24

Dear Sir,

We can consult book Edited by Dr. Wohlbier.... Stackin, blending & reclaiming. The chapter written by Mr. Gerstel.