User:Dhatfield/Sandbox Two - product formula

Two product formula

To derive the two-product formula, define mass balances and recovery. 1 F= C+U Feed (tph) = Coarse (tph) + Underflow (tph) 2 Ffi=Cci+Uui Mass balance for each size fraction i. 3 Reci=Cci/Ffi Recovery defined for each size fraction i.

Multiply (1) by ui and subtract from (2): 5 Fui=Cui+Uui 2 Ffi=Cci+Uui 6 Ffi-Fui=Cci-Cui+Uui-Uui

Factor (6): 7 F(fi-ui)=C(ci-ui)

Solve (7) for C/F: 8 C/F=(fi-ui)/(ci-ui)

Substitute (8) into (3): 9 Reci=ci(fi-ui)/fi(ci-ui) Two-product formula

Example equations

The derivative term is given by:

$D_{\mathrm {out} }=K_{d}{\frac {de}{dt}}(t)$

where

$D_{\mathrm {out} }$: Derivative term of output

$K_{d}$: Derivative gain, a tuning parameter

$e$: Error $=SP-PV$

$t$: Time or instantaneous time (the present)

Slurry calculations

To determine the percent solids (or solids fraction) of a slurry from the density of the slurry, solids and liquid:

$\mathrm {\%solids} =100*{\frac {\rho _{solids}(\rho _{slurry}-\rho _{liquid})}{\rho _{slurry}(\rho _{solids}-\rho _{liquid})}}$

where

$\rho _{solids}$ is the solids density

$\rho _{slurry}$ is the slurry density

$\rho _{liquid}$ is the liquid density.

Flow from % solids

$\rho _{slurry}={\frac {M_{slurry}}{Q_{slurry}}}$

$\phi _{sl}={\frac {M_{s}}{M_{sl}}}$