4.010.5Poor-→GoodFlotationFlotation10.0-3.59.53.09.0-2.5H8.52.08.0-PHO.Conductivity-1.57.51.07.060007000400050000100030002000Soda AshDosage [g/t]Effectofsodaash(Na,CO)onpHandconductivityofthedeslimedmarginal oreflotationfeed(B.Nanthakumar,D.Grimmand M.PawlikInt.J.Min.Proc.,92,49-57(2009)NORMAN B.KEEVILINSTITUTE OFMINING ENGINEERINGwww.mining.ubc.ca
Effect of soda ash (Na2CO3 ) on pH and conductivity of the deslimed marginal ore flotation feed (B. Nanthakumar, D. Grimm and M. Pawlik, Int.J.Min.Proc., 92, 49-57 (2009)
39-8min.flotation38-6min.flotation37a36-35-Marginal oreO Soda Ash Only34-eStarch1200g/t33-+Guargum600g/tGuar gum 1200g/t32-3170806040509030CumulativeP,O,Recovery[%]Thegrade vs.recovery plot for the marginal ore, soda ash 3.5kg/t, tall oil800 g/t. (Nanthakumar etal, 2009).NORMAN B.KEEVILINSTITUTE OF MINING ENGINEERINGwww.mining.ubc.ca
The grade vs. recovery plot for the marginal ore, soda ash 3.5 kg/t, tall oil 800 g/t. (Nanthakumar et al, 2009)
Thisexample illustratesthe generalproblem in the flotation with anioniccollectors (fattyacids)intheprocesswaters with high content of Ca2+andMg2+.Yousef at al.showed how to usesoda ash and water glassin the flotationof a phosphate ore inseawater (22ndIMPC,CapeTown,2003).A highabilityofsodium silicate to remove calcium andmagnesiumions from process water wasproven by Li et al., Ind. Eng. Chem. Res.,44,4753-4761（2005)NORMAN B.KEEVILINSTITUTE OF MINING ENGINEERINGwww.mining.ubc.ca
This example illustrates the general problem in the flotation with anionic collectors (fatty acids) in the process waters with high content of Ca2+ and Mg2+ . Yousef at al. showed how to use soda ash and water glass in the flotation of a phosphate ore in seawater (22nd IMPC, Cape Town, 2003). A high ability of sodium silicate to remove calcium and magnesium ions from process water was proven by Li et al., Ind. Eng. Chem. Res., 44, 4753-4761 (2005)
Somelarge depositsof Cu-Mosulfide oresarelocated in arid areaswithvery limitedresourcesoffreshwater (e.g.Atacama DesertinChile)and the flotationin sea waterbecamea veryimportantissue.NORMAN B.KEEVILINSTITUTE OF MINING ENGINEERINGwww.mining.ubc.ca
Some large deposits of Cu-Mo sulfide ores are located in arid areas with very limited resources of fresh water (e.g. Atacama Desert in Chile) and the flotation in sea water became a very important issue
ahuPnCGabumhadorValaAtacamaATOEDesertrhhackt)andeValparait"yJuanFinndndies(cR.)TallardeiPtatattlancaTemwValdviPunrto MorPhw,VdoitsChaArckChonosComodoroRivbdaviaFeTiFEFrdlGN/dGrydend(brNORMAN B.KEEVILINSTITUTE OF MINING ENGINEERINGwww.mining.ubc.ca
Atacama Desert