Usage of fly ash from flue gas desulfurization to make compositions for building

• US 10,640,421 B2
• Filed: 08/03/2017
• Issued: 05/05/2020
• Est. Priority Date: 08/04/2016
• Status: Active Grant

• Current Assignee: Chien-Fan Lien, Chin-Tien Lien
• Original Assignee: Chien-Fan Lien, Chin-Tien Lien
• Inventors: Lien, Chin-Tien, Lien, Chien-Fan
• Primary Examiner(s): Mcdonough, James E
• Application Number:
  US15/668,651
• Publication Number:
  US 20180037499A1
• Time in Patent Office: 1,006 Days
• Field of Search: 106638, 106772, 106775
• CPC Class Codes: C04B 11/005 Preparing or treating the raw materials
• CPC Class Codes: C04B 11/06 starting from anhydrite
• CPC Class Codes: C04B 18/08 Flue dust , i.e. fly ash
• CPC Class Codes: C04B 2103/10 Accelerators; Activators
• CPC Class Codes: C04B 2111/0062 Gypsum-paper board like materials
• CPC Class Codes: C04B 2111/28 Fire resistance, i.e. materials resistant to accidental fires or high temperatures
• CPC Class Codes: C04B 2111/60 Flooring materials
• CPC Class Codes: C04B 22/062 of the alkali or alkaline-earth metals
• CPC Class Codes: C04B 22/064 of the alkaline-earth metals
• CPC Class Codes: C04B 22/143 Calcium-sulfate
• CPC Class Codes: C04B 22/147 Alkali-metal sulfates; Ammonium sulfate
• CPC Class Codes: C04B 24/38 Polysaccharides or derivatives thereof C04B24/243 takes precedence
• CPC Class Codes: C04B 28/145 Calcium sulfate hemi-hydrate with a specific crystal form
• CPC Class Codes: C04B 28/165 containing synthetic anhydrite
• CPC Class Codes: C04B 7/02 Portland cement
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

Composition for building materials comprises of fly ash from flue gas desulfurization. The fly ash (β CaSO₄ anhydrite), obtained from circulating fluidized bed flue gas desulfurization, is mixed with binder reactants at a ratio of 9:1. It'"'"'s mainly used for non-structural cement mortar, bricks for paving walkways, brick wall decors, fire-resistant walls for interior partitions, plasterboards and so on. The binder reactants compose of 70% CaSO₄.½H₂O, 10% Na₂SO₄, 10% CaO, 5% NaOH, 0˜5% cement and 0˜5% starch. When the binder reactants are mixed with fly ash and water (30% to 40% of the above total weight), the hydration process of CaSO₄ anhydrite is accelerated.

Claims

1. The binder reactant for reusing a calcium sulfate compound, comprising:

about 70% CaSO₄.½

H₂O, about 10% Na₂SO₄, about 10% CaO, about 5% NaOH, about 0-5% cement, and about 0-5% starch, wherein said binder reactant is mixed with said calcium sulfate compound for reusing said calcium sulfate compound.

2. The binder reactant of claim 1, wherein the calcium sulfate compound is characterized by a fly ash, wherein said fly ash, obtained from circulating fluidized bed flue gas desulfurization, contains substantially β

CaSO₄ anhydrite, and wherein said fly ash is mixed with said binder reactant at a ratio about 9;

1, thereby a mixture is formed.

3. The binder reactant of claim 2, wherein said mixture is mixed with water with weighted percentage essential between 30% and 40%, whereby a hydration process is accelerated.