Mass Balances
ObjectiveProcess parametersEquipment sizing
IntroductionMass in = Mass outMass (solids) = mass (solids in concentrate) + mass (solids in tails)
IntroductionMass in (mineral) = Mass out (mineral)Mass (FeTiO3 Feed) = mass (FeTiO3 in concentrate) + mass (FeTiO3 in tails)
IntroductionMass in (water) = Mass out (water)Mass (water Feed) = mass (water in concentrate) + mass (water in tails)
IntroductionMass in (Si) = Mass out (Si)Mass (Si in Feed) = mass (Si in concentrate) + mass (Si in tails)
Mass BalancesNomenclatureT tph solidsM m3/h slurryW m3/h liquids solids density (t/m3)M = T/s + W
Mass BalancesConcentration termsRD relative density% Sm - % solids by mass% Vs - % solids by volumeg/l grams solid per liter slurryl:s liquid to solid ratiow:s water to solid ratioDifferent ways of describing the same thing
Mass BalancesRD relative densityRD = (T+W)/(M)Units t/m3% Sm - % solids by mass% Sm=T/(T+W)*100% Sv - % solids by volume% Sv=(T/s)/(M)*100
Mass Balancesg/l grams solids per liter slurryg/l=T/M*1000l:s and w:s=W/T
Mass BalancesOpen circuit
Mass BalancesMass balancesOpen circuit exampleFeed 250 tph (dry basis)3% moisture in feeds 2.7 t/m3
Mass Balances
Mass balances (Example)
Mass balances (Example)90t/h solids120 m3/h water30 m3/h water90t/h solids150 m3/h water
Mass Balances
Mass BalancesClosed circuit
Mass BalancesClosed circuit exampleFeed 250 tph3% moistures 2.7 t/m3Circulating load 275 %Mill density 45 %VsCyclone overflow 30 % solids by mass
Mass Balance
Mass Balance
Mass BalancesMixed circuit
Mass BalancesMixed circuitUse similar approach to do mass balance
Mass BalancesMass balancesWiP80F80Are not required to do the mass balance
Mass BalancesCrusher circuits
Mass Balances
Mass Balances
Mass BalancesSame principles applyWater is presentMoistureWashing on screen decks
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