Separation of Dolomite from Phosphate at Low Cost and Reduced Environmental Impact
April 29-May 4, 2018
Magnesium (MgO) in phosphate rock causes numerous problems in the phosphoric acid manufacturing process, including reducing filtration capacity, increasing sulfuric acid consumption, and making it difficult to meet product grade. MgO-containing minerals are fully dissolved and usually coexist in phosphoric acid by acid hydrolysis reaction to form Mg(H2PO4)2. This makes it extremely difficult to separate the dissolved Mg from phosphoric acid. Therefore, it makes both economic and technological sense to remove dolomite from phosphate prior to acidulation. Except for limited use of heavy media gravity separation, flotation is the main technology currently practiced for separation of dolomite from phosphate. Because fine grinding is required to liberate dolomite for flotation separation, use of mechanical flotation cells is very expensive due to energy cost, long flotation time and high reagent use.
Recent development efforts have resulted in industry acceptance of an innovative flotation device, the packed flotation column (PFC), thus realizing its six (6) main advantages:
- low energy use
- long separation zone
- small footprint
- reduced water use
- high throughput
- effective for very fine particles
Please click Additional Files below to see the full abstract.
Wending Xiao, Dapeng Zhang, and Patrick Zhang, "Separation of Dolomite from Phosphate at Low Cost and Reduced Environmental Impact" in "Beneficiation of Phosphates VIII", Dr. Patrick Zhang, Florida Industrial and Phosphate Research Institute, USA Professor Jan Miller, University of Utah, USA Professor Laurindo Leal Filho, Vale Institute of Technology (ITV), Brazil Marius Porteus, Foskor-Mining Division, South Africa Professor Neil Snyders, Stellenbosch University, South Africa Mr. Ewan Wingate, WorleyParsons Services Pty Ltd., Australia Prof. Guven Akdogan, Stellenbosch University, South Africa Eds, ECI Symposium Series, (2018). http://dc.engconfintl.org/phosphates_viii/20