Portland cement manufacture using municipal solid waste incineration ash

Patent metadata

Field	Value
Publication number	US-2021078902-A1
Application number	US-202017025205-A
Country	US
Kind code	A1
Filing date	Sep 18, 2020
Priority date	Sep 18, 2019
Publication date	Mar 18, 2021
Grant date	—

Abstract

Various examples related to portland cement manufacturing using municipal solid waste incineration (MSWI) ash are provided. In one example, a method includes providing a raw kiln feed including MSWI to a kiln, forming ash-amended clinker (ACK) by heating the raw kiln feed in the kiln, and preparing ash-amended cement (AAC) from the ACK. The MSWI bottom ash can make up about 5% by mass or less of the raw kiln feed. The ACK can have a chemical composition that meets ASTM C150/ASTM C595, and the AAC can include arsenic, barium, copper, and lead consistent with defined Soil Cleanup Target Levels. In another example, a system includes a kiln, a kiln feed system that supplies raw kiln feed including MSWI bottom ash to the kiln, and a finish mill that grinds ACK formed by heating the raw kiln feed in the kiln to form AAC.

First claim

Therefore, at least the following is claimed:

1 . A method for portland cement manufacturing, comprising:
providing a raw kiln feed to an industrial cement production kiln, the raw kiln feed comprising municipal solid waste incineration (MSWI) bottom ash from a refuse derived fuel, where the MSWI bottom ash makes up about 5% by mass or less of the raw kiln feed; forming ash-amended clinker (ACK) by heating the raw kiln feed in the industrial cement production kiln; and preparing ash-amended cement (AAC) from the ACK formed in the industrial cement production kiln.

2 . The method of claim 1 , wherein the MSWI bottom ash is subjected to a metals recovery process for recovery of ferrous and non-ferrous metals.

3 . The method of claim 2 , wherein the MSWI bottom ash is filtered to remove large particles.

4 . The method of claim 1 , wherein the industrial cement production kiln is a dry process kiln.

5 . The method of claim 1 , wherein the raw kiln feed comprises a combination of coal ash, bauxite ore, iron slag, limestone, sand and the MSWI bottom ash.

6 . The method of claim 1 , wherein the ACK comprises a chemical composition for the formation of portland cement that meets ASTM C150/ASTM C595.

7 . The method of claim 1 , wherein the AAC is prepared from the ACK using a finish mill with addition of gypsum.

8 . The method of claim 1 , wherein the raw kiln feed comprises about 5% by mass of the MSWI bottom ash.

9 . The method of claim 1 , wherein the raw kiln feed comprises about 2.8% by mass of the MSWI bottom ash.

10 . The method of claim 1 , wherein the AAC comprises arsenic (As), barium (Ba), copper (Cu), and lead (Pb) consistent with defined Soil Cleanup Target Levels (SCTL).

11 . The method of claim 1 , wherein the MSWI bottom ash comprises unwashed MSWI bottom ash.

12 . A system for portland cement manufacturing, the system comprising:
an industrial cement production kiln; a kiln feed system that supplies raw kiln feed comprising municipal solid waste incineration (MSWI) bottom ash from a refuse derived fuel to the industrial cement production kiln, where the MSWI bottom ash makes up about 5% by mass or less of the raw kiln feed; and a finish mill that grinds ash-amended clinker (ACK) formed by heating the raw kiln feed in the industrial cement production kiln to form ash-amended cement (AAC).

13 . The system of claim 12 , wherein the AAC is formed from the ACK by the finish mill with addition of gypsum.

14 . The system of claim 12 , wherein the industrial cement production kiln is a dry process kiln.

15 . The system of claim 12 , wherein the ACK from the industrial cement production kiln is cooled prior to grinding by the finish mill.

16 . The system of claim 12 , wherein the raw kiln feed comprises a combination of coal ash, bauxite ore, iron slag, limestone, sand and MSWI bottom ash.

17 . The system of claim 12 , wherein the MSWI bottom ash is subjected to a metals recovery process for recovery of ferrous and non-ferrous metals prior to being added to the raw kiln feed.

18 . The system of claim 17 , wherein the MSWI bottom ash is filtered to remove large particles.

19 . The system of claim 12 , wherein the MSWI bottom ash comprises unwashed MSWI bottom ash.

20 . The system of claim 12 , wherein the ACK comprises a chemical composition for the formation of portland cement that meets ASTM C150/ASTM C595.

Assignees

• Univ Florida

Inventors

• Ferraro Christopher C
• Townsend Timothy G
• Clavier Kyle A

Classifications

• C04B7/28

  from combustion residues, {e.g. ashes or slags from waste incineration}({C04B7/243} , C04B7/26 take precedence) · CPC title

• Y02P40/10

  Production of cement, e.g. improving or optimising the production methods; Cement grinding · CPC title

• F27B3/18

  Arrangements of devices for charging · CPC title

• F27B3/24 Primary

  Cooling arrangements · CPC title

• C04B28/14

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title