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Faculté des Sciences appliquées
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Process mineralogy of the new polymetallic ores from Draa Sfar project extension (Morocco)

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Parent, Corinne ULiège
Promotor(s) : Pirard, Eric ULiège
Date of defense : 20-Aug-2019 • Permalink : http://hdl.handle.net/2268.2/8520
Details
Title : Process mineralogy of the new polymetallic ores from Draa Sfar project extension (Morocco)
Author : Parent, Corinne ULiège
Date of defense  : 20-Aug-2019
Advisor(s) : Pirard, Eric ULiège
Committee's member(s) : Ghorbani, Yousef 
Nguyen, Frédéric ULiège
Bastin, David ULiège
Chahid, R. 
Language : English
Number of pages : 224
Keywords : [en] Cu-Pb-Zn polymetallic ores, quantitative mineralogy, process mineralogy, geometallurgy, flotation, laboratory test, laboratory scale, plant scale, sampling, masse balance, size by size study, SEM, liberation degree, mineral associations, sulphide gangue
Discipline(s) : Engineering, computing & technology > Geological, petroleum & mining engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil des mines et géologue, à finalité spécialisée en "geometallurgy (EMERALD)"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] In this project, the ore of the project of expansion of Draa Sfar mine is studied. The deposit is a Cu-Pb-Zn polymetallic Volcanogenic Massive Sulphide. The project extension contains three main ore-types: the polymetallic mineralisation from -1200 m to -1300 m, the polymetallic mineralisation from -1300 m to -1500 m and a copper-rich polymetallic ore. Targeted minerals are galena for lead, chalcopyrite for copper and sphalerite for zinc. The ores of the extension are first studied to determine its quantitative mineralogy. The ores of the deposit extension are compared to the ore that is presently exploited in Draa Sfar. Then, in a second stage, their behaviour is estimated in a laboratory flowsheet similar to the one of the the flotation plant used to process the ore currently extracted from Draa Sfar mine called reference ore. The flowsheet comprises multiple grinding stages in between a lead, a copper and finally a zinc flotation circuits. To fulfil both objectives, the three ores of the extension project and the present ore are sampled and analysed. Then, they are floated in laboratory tests and their products are analysed on bulk and sized samples, SEM is also used. A sampling of the plant is also conducted, but on a too short period to provide reliable results.
Ores of the extension project appear poorer in lead and zinc than reference ore, they are also richer in copper. In the lower part of the deposit, -1200 m, the liberation degree of galena is decreasing and the one of chalcopyrite increasing compared to the reference ore. These characteristics of the future feed of the plant suggest to modify the flowsheet to a copper flotation followed by lead and zinc flotations. At laboratory scale, the reference ore produces lead, copper and zinc concentrates with higher recoveries than in the ores of the extension project. In the lead, copper and zinc circuit, the concentrates are diluted by an entrainment of sulphide and silicate gangue pointing to a lack of selectivity of the three flotation circuits. In the lead circuit, the low recoveries in the concentrates of the ores of the extension project compared to reference ore can be related to a lack of liberation of galena leading to losses to the middling streams of the copper circuit. In the copper concentrate, copper grade is higher in ores from the extension thanks to the coarser liberation of chalcopyrite in the reference.


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Author

  • Parent, Corinne ULiège Université de Liège > Master ingé. civ. mines & géol., à fin. (EMERALD)

Promotor(s)

Committee's member(s)

  • Ghorbani, Yousef Lulea University of Technology
  • Nguyen, Frédéric ULiège Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
    ORBi View his publications on ORBi
  • Bastin, David ULiège Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
    ORBi View his publications on ORBi
  • Chahid, R.
  • Total number of views 38
  • Total number of downloads 7










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