Irreversible reaction

Desilication (kaolinite to sodalite-type desilication product)

3Al2Si2O5(OH)4+8NaOHDSP+9H2O

Direction
Irreversible
Processes
1
Stated as
Fixed conversion
Element balance
Checked: balances
As the processes state itStoichiometry, conversions, heats of reaction and catalyst windows are taken from each process's files with their provenance. The build checks only that each process's equation balances in every element, from the process's own component formulas; it does not check the numbers. A process's design maturity applies to them.

Species

SpeciesNameCASRoleCoefficient
Al2Si2O5(OH)4Kaolinite1318-74-7reactant-3
NaOHSodium hydroxide1310-73-2reactant-8
DSPDesilication product, carried as hydroxysodalitenone (not merged across processes)product1
H2OWater7732-18-5product9

In the processes

  • Alumina by the Bayer process (3000 t/d smelter-grade alumina, concept)Concept · not reviewed

    DESIL · Desilication (kaolinite to sodalite-type desilication product)3 Al2Si2O5(OH)4(s) + 8 NaOH(aq) → Na8Al6Si6O24(OH)2(s) + 9 H2O(l)

    Stated as
    Fixed conversion
    Phase
    mixed
    Element balance
    Balances in every element
    Conversion
    100 % of Kaol (assumed: D-004: reactive silica fully converted in pre-desilication and digestion; DSP carried as hydroxysodalite (Na/Si 1.33), the anions of real Bayer sodalite (carbonate, sulfate, chloride) not carried)

Sources

What the processes cite for this reaction, each source once: for the reaction itself, its conversion, its heat of reaction or its catalyst. As the processes write them; DOIs, US patent numbers and web addresses are linked.

  1. D-004: reactive silica fully converted in pre-desilication and digestion; DSP carried as hydroxysodalite (Na/Si 1.33), the anions of real Bayer sodalite (carbonate, sulfate, chloride) not carried

    For the conversion · cited by Alumina by the Bayer process (3000 t/d smelter-grade alumina, concept)