Assignment Task: Mineral Processing
Problem 1:
A hydrocyclone is classifying material as shown below:
What % of the feed material will be classified?
Problem 2:
What is circulation ratio and circulating load of a mill if the hydrocyclone underflow is regrind in the mill. The operation parameters of the hydrocyclone are shown below:
Problem 3:
The volume flow rate of pump fed to a hydrocyclone was 129 L/min. Its solid content was held at 32% by volume. Samples of the feed, under flow and over flow streams were taken simultaneously, dried and a size analysis carried out. The results obtained were:
Underflow rate = 30 L/min Overflow rate = 99 L/min
|
Particle Size
|
Feed Mass
|
Underflow Mass
|
Overflow Mass
|
|
|
|
|
|
|
µm
|
%
|
%
|
%
|
|
212
|
2.6
|
6.24
|
0
|
|
|
|
|
|
|
-62
|
8.9
|
18.77
|
0.4
|
|
|
|
|
|
|
-44
|
22.1
|
42.59
|
2.8
|
|
|
|
|
|
|
-16
|
10.8
|
13.99
|
6.8
|
|
|
|
|
|
|
-15
|
7.9
|
7.26
|
8.3
|
|
|
|
|
|
|
-12
|
7.8
|
4.77
|
9.4
|
|
|
|
|
|
|
-10
|
5.8
|
2.57
|
6
|
|
|
|
|
|
|
-8
|
4.8
|
1.22
|
5.7
|
|
|
|
|
|
|
-11
|
6.5
|
0.83
|
10.4
|
|
|
|
|
|
|
-34
|
22.8
|
1.75
|
50.23
|
Draw a partition curve and determine:
a) Cut point(d50)
b) Watersplit
c) Corrected cut point(d50??)
d) Imperfection.
Problem 4:
A hydrocyclone classifier is fed with quartz slurry at the rate of 20.8 t/h from a grinding mill. The underflow is re-circulated. The screen analysis of each stream was determined with the following results:
|
Size
|
Feed Mass
|
Overflow Mass,
|
Underflow Mass
|
|
|
|
|
|
|
µ
|
%
|
%
|
%
|
|
300
|
25
|
0
|
33.2
|
|
|
|
|
|
|
-50
|
15.3
|
0
|
20.3
|
|
|
|
|
|
|
-100
|
11.6
|
0.2
|
15.4
|
|
|
|
|
|
|
-44
|
12.8
|
5.4
|
15.2
|
|
|
|
|
|
|
-31
|
9.6
|
18.3
|
6.7
|
|
|
|
|
|
|
-75
|
25.7
|
76.1
|
9.2
|
Determine:
a) The circulation ratio
b) The efficiency of the cyclone.
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