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MPT721S - Mineral Processing Techniques and Applications 324 - 2nd Opp - Nov 2022 |
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nAm I BIA un IVERSITY
OFSCIEnCEAno TECHnOLOGY
FACULTY OF ENGINEERING
DEPARTMENT OF MINING AND PROCESS ENGINEERING
QUALIFICATION : BACHELOR OF ENGINEERING IN METALLURGY, CHEMICAL
ENGINEERING & MINING ENGINEERING
QUALIFICATION CODE: BSc.
COURSE CODE: MPT721S
LEVEL: 7
COURSE NAME: MINERAL PROCESSING
TECHNIQUES AND APPLICATIONS 324
SESSION: OCTOBER 2022
DURATION: 3 HOURS
PAPER: THEORY
MARKS:100
SECOND OPPORTUNITY QUESTION PAPER
EXAMINER(S)
Dr. Clement K. Owusu
Mr. Thomas Moongo
MODERATOR:
Prof. Godfrey Dzinomwa
INSTRUCTIONS
1. Answer all questions.
2. Read all the questions carefully before answering.
3. Marks for each question are indicated at the end of each question.
4. Please ensure that your writing is legible, neat and prese_n~ple._-:--.~- , .
PERMISSIBLE MATERIALS
-- .- -
1. Examination paper.
THIS QUESTION PAPER CONSISTS OF 3 PAGES (Including this front page)
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Question 1
a. During a routine check at the plant, it was observed that the oxygen and
cyanide concentration were far below the set point. The oxygenation and
cyanide supply system when checked was functioning very well. A check from
the mineralogical data supplied by the geologist revealed the presence of iron
and copper sulphide minerals. As a metallurgist on site discuss the possible
cause for observed drop in oxygen and cyanide concentration. What will the
effect when the problem is not rectified?
(10 marks)
b. Mention five (5) operating variables that regulate the flotation minerals
(10marks)
c. Tin ore assaying 10% Sn is fed to a concentration plant at the rate of 100
tons/hr. If the grades of concentrate and tailing are 40% Sn and 1 % Sn, calculate
the recovery of tin and tin lost in tailing in tons/hr.
(15 marks)
Question2
a. Develop a simple beneficiation flow chart for uraninite
(15 marks)
b. Explain the following terms as applied in froth flotation
i. Entrainment
(2 marks)
ii. Induction time
(2 marks)
iii. Contact time
(2 marks)
tea c. 100 g of graphite with 60% carbon is to aflotation ceJiJn llie-labor~t~y. -By-- --·
using proper reagents 50 g of concentrate assaying 90% carbon -is obtained.
Calculate the percentage recovery, ratio of concentration and ratio of enrichment,
(10 marks)
- •.:.-.:.;-:::.::.~:-.:._.-._-:-:_:-:_:-:.-- -----~-..-:-.=--=--=---:-,:--=-·..-:._ .... ·- - -- - --- --,:_--- -·..•·- -- - --·- -· ·- --· ----·~~~---- - ··--=-=-~·---~-·---·-
- ----·---·----_--_-·
----------
- - --
2
-- ~--- --· - -·
-- -
~- .-.-.:._. _ -.:.. -:-. ~ .-...
.·.:. -::· :...-- ~--;-_:·-.
- .. --
-----
-
-.
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Question 3
a. Mention 3 purposes for thickening in the minerals industry (6 marks)
b. Explain briefly the mode of operation of a dense medium cyclone (DMC)
(support with a diagram)
(5 marks)
c. Dense medium separation of diamondiferous ore was carried out to evaluate
the economic cut point. The various floats and sinks fractions after the test work
were assayed for diamond content and the distribution of diamond in the
various density fractions is presented in the table below.
Specific
gravity of
test
-2.65
+2.65-2.70
+2.70-2.75
+2.75-2.80
+2.80-2.85
+2.85-2.90
+2.90-2.95
+2.95-3.00
+3.00
Nominal
SG
1.325
2.675
2.725
2.775
2.825
2.875
2.925
2.975
Fractional
weight
(wt.%)
1.5
9.29
26.11
19.67
11.91
10.92
7.87
2.55
10.18
Cum. (%wt)
Assay
(Carats/Hundred
tonnes
0.008
0.040
0.036
0.042
0.172
0.340
0.371
1.300
7.800
Wt%*
Assay
Cum
(wt%*Assay
Assay
i. Complete the above table
ii. What is the cut point density?
iii. Estimate Calculate Ep
(8 marks)
(3 marks)
(12 marks)
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End_____________
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