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