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The mixing efficiency is a measure of the quality of the mixing operation and one of the quality indicators of the mixture. The iron , fixed carbon, calcium oxide, silica, moisture and particle size in the mix are typically determined.
There are two calculation methods for mixing efficiency:
(1) Calculate the mixing efficiency of the mixture.
Where K 1 , ... K n — the uniformity coefficient of each sample;
C 1 ... C n ——— the content of a certain measurement item in each sample taken, %,
C———The average content of a certain test item in this group of samples, %.
After the uniformity coefficient is obtained, the mixing efficiency of the mixture is calculated as follows:
The closer the mixing efficiency is to 1, the better the mixing effect.
(2) Calculate the average uniformity coefficient. First, the uniformity coefficient of each sample is obtained according to the formula (1), and then the average uniformity coefficient of a set of samples is obtained.
Where K 2 --- the average uniformity coefficient, the closer to zero, the better the mixing effect;
K d ——— greater than 1 in the uniformity coefficient of each sample,
K s ——— less than 1 in the uniformity coefficient of each sample,
n———Number of samples.
Both of the above methods can be used, but the second method is more comprehensive because all values ​​of a set of samples are taken into account. The first method is to calculate the maximum and minimum values ​​in a set of samples, so it is not accurate.
Example: Calculate the mixing efficiency of fixed carbon in the mixture. Take five trials in turn, and test their fixed carbon content as follows:
Sample No. 1 2 3 4 5
Content% 3.4 3.5 3.21 2.92 4.38
Method 1: The content of fixed carbon in the mixture was 3.48% of the average of the five samples.
The uniformity of the fixed carbon distribution in each sample is:
In the same way, the mixing efficiency of the mixture of iron, calcium oxide, silicon dioxide, moisture and particle size can be calculated.
The globing efficiency is expressed in terms of the particle size composition of the mixture.
The following is a secondary mixer and the measurement result of a sintering plant pelletizing efficiency, which is the ratio of ingredients concentrate 58.65%, 5.034% China copper concentrate, blast furnace dust 6.55%, 12.19% limestone, 3.74% lime , white ash 3.74%, dolomite 2.79%, coal 6.7%.
1) The effect of one mixing is obvious, and the efficiency of secondary mixing is improved but not significant. 2) After double mixing, the pelleting efficiency is improved, and the 2~0 mm fraction is significantly reduced after the second mixing, indicating that the secondary mixing mainly plays a role in pelletizing. The 2 to 0 mm rise before the second mixing was caused by the mixing of the returning water and the transport and fragmentation. 3) After the second mixing, although the level of 2 to 0 mm is reduced, the content is still as high as 28.23%, indicating that the secondary mixing time is insufficient.
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