Iron Removal from Low-Grade Pyrophyllite Ore by Microwave Irradiation and Dry Magnetic Separation
Source abstract
Abstract
Owing to its unique properties, pyrophyllite is an economical alternative to many minerals in different applications. The presence of iron-bearing minerals in Saudi pyrophyllite hampers its industrial uses. The aim of this study was to examine the removal of iron from Saudi low-grade pyrophyllite ore using two approaches. The first approach involves dry high-intensity magnetic separation, whereas the second approach involves microwave pretreatment of the ore before dry magnetic separation. For the first approach, the studied operating parameters were roll speed; feed rate, field intensity, and feed particle size. For the alternative approach, microwave treatment followed by dry magnetic separation, the microwave irradiation time and the magnetic field intensity were studied. The results show that the combined microwave treatment and dry separation method could provide high-purity pyrophyllite for filler industries. Microwave irradiation for 30 min was optimal to change impurity phases (i.e., pyrite, hematite) into ferromagnetic phases in microwave-treated pyrophyllite samples. At a magnetic field intensity of 2000 Gauss, the 30 min microwave-irradiated pyrophyllite sample achieved an iron recovery of 11.2% in non-magnetic fractions, with a removal efficiency of 89% with an alumina recovery of 91.31%.
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Research context
OpenAlex topics: Minerals Flotation and Separation Techniques · Metal Extraction and Bioleaching · Bauxite Residue and Utilization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Mining Engineering Department, King Abdulaziz University, Jeddah P.O. Box 80204, Saudi Arabia
Environmental Studies Department, National Authority of Remote Sensing and Space Sciences, El-Nozha El-Gedida, Cairo P.O. Box 1564, Egypt
Saudi Mining Polytechnic, Arar P.O. Box 215, Saudi Arabia
Geological Research Authority of Sudan, Ministry of Minerals, Khartoum P.O. Box 410, Sudan
Funding
Deanship of Scientific Research (DSR), King Abdulaziz University
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