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Carbonation of industrial calcium-containing waste for the production of sustainable construction materials
 
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1
Urgench State University named after Abu Rayhan Biruni
 
2
Urgench State University named after Abu Rayhan Beruni
 
3
Tashkent Institute of Chemical Technology
 
4
Deputy Dean of Mamun University
 
5
KRICT Directorate LLC, Tashkent
 
 
Corresponding author
Sherzad Matchanov   

Urgench State University named after Abu Rayhan Biruni
 
 
 
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ABSTRACT
The objective of this experiment is to use waste from sugar processing industries such as defecation sludge, hydrated lime, and pure quick lime in the form of an accelerated carbonation reaction for evaluation of their potential as construction material. The chemical composition of the waste materials was studied in addition to thier changes due to the carbonation reaction as well as the physical and mechanical properties. Various instruments such as XRD, FTIR, DTA/TG were used. Upon forcing carbonation, the compounds of calcium in the waste combined with CO₂ to form stable CaCO₃. From the sample DS-5, it is observed that the carbonated waste contained 42.5% by weight of CO₂. From the most effective sample, it was evident that around 88.5% of the product was converted into marble-like crystals of CaCO₃. We have seen that the samples have achieved compressive strength of 27.5 MPa and water absorption of 3.1%. These observations revealed that through forcing carbonation of defecate, hydrated lime, and quicklime, you can effectively utilize industrial waste, sequestrate CO₂ in minerals and convert the product into secondary raw material for manufacturing building materials. Consequently, the proposed technology not only stimulates waste reutilization and rational consumption but also helps reduce the anthropogenic load on the environment through the mineral binding of CO₂ in the form of CaCO₃. The obtained results may serve as a basis for the creation of ecologically effective and economical building materials using the carbonization of calcium-containing wastes from the sugar industry.
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