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CO2 mineralization in AAC blocks, Henan Qiagnai New Materials - Coggle…
CO2 mineralization in AAC blocks
Fundamentals
What is concrete?
Carbonation
Composite material
ITZ
Interface between aggregates and matrix phase
Chemistry/Thermodynamics
CO2 mineralization
Industrial Process
Step-pressure equalising
Cement bin feeder
Filler blender unit
Broken Unit
Brick Machine unit
Pre-Curing room
CO2 curing chamber
Fly Ash + CaO + Slag (CA) + Cement
The mixture is blend at appropriate proportions and bricks are formed in broken units
CO2 provided to curing chamber by a CO2 tanker. Using a gasification pry, the CO2 is recycled
Produces carbonates of Ca or Mg from Carbon dioxide
AAC blocks
Fine agg+Cement+Water+Al Powder +Lime (CaO)
Al + Ca(OH)2 ---> H2.
Porous, hollow, lightweight due to bubbles and microweight of H2
Autoclaving
11A-Tobermorite formed (Ca5Si6O16(OH)2·4H2O or Ca5Si6(O,OH)18·5H2O.)
Stronger and durable (Load bearing)
Tobermorite reacts to form Calcium Carbonate
Neutral
Henan Qiagnai New
Materials