US 12,415,213 B2
Resource recovery method and resource recovery system of desulfurized ash
Rui Mao, Suzhou (CN); Shendong Mao, Suzhou (CN); Fei Wang, Suzhou (CN); and Hang Su, Suzhou (CN)
Assigned to ZHANGJIAGANG HONGCHANG STEEL PLATE CO., LTD., Suzhou (CN); HANGSU SHAGANG GROUP CO., LTD., Suzhou (CN); and INSTITUTE OF RESEARCH OF IRON AND STEEL, JIANGSU PROVINCE/SHA-STEEL, CO., LTD., Suzhou (CN)
Appl. No. 17/766,218
Filed by INSTITUTE OF RESEARCH OF IRON AND STEEL, JIANGSU PROVINCE/SHA-STEEL, CO., LTD., Suzhou (CN); ZHANGJIAGANG HONGCHANG STEEL PLATE CO., LTD., Suzhou (CN); and JIANGSU SHAGANG GROUP CO., LTD., Suzhou (CN)
PCT Filed Dec. 3, 2019, PCT No. PCT/CN2019/122680
§ 371(c)(1), (2) Date Apr. 1, 2022,
PCT Pub. No. WO2021/097912, PCT Pub. Date May 27, 2021.
Claims priority of application No. 201911151098.X (CN), filed on Nov. 21, 2019.
Prior Publication US 2024/0100579 A1, Mar. 28, 2024
Int. Cl. B09B 3/40 (2022.01); B01D 53/50 (2006.01); B01D 53/80 (2006.01); B01D 53/96 (2006.01); B09B 3/70 (2022.01); B09B 101/30 (2022.01); C01B 17/50 (2006.01); C01F 11/08 (2006.01); C22B 1/16 (2006.01)
CPC B09B 3/40 (2022.01) [B01D 53/502 (2013.01); B01D 53/80 (2013.01); B01D 53/96 (2013.01); B09B 3/70 (2022.01); C01B 17/506 (2013.01); C01F 11/08 (2013.01); C22B 1/16 (2013.01); B01D 2251/404 (2013.01); B01D 2251/602 (2013.01); B01D 2251/604 (2013.01); B01D 2257/302 (2013.01); B01D 2258/0283 (2013.01); B09B 2101/30 (2022.01)] 9 Claims
OG exemplary drawing
 
1. A resource recovery method of desulfurized ash, comprising:
a water washing process: washing desulfurized ash with water, a mass ratio of water to desulfurized ash is greater than 20:1, and performing solid-liquid separation to obtain solid residues rich in calcium sulfite and calcium sulfate and a solution rich in calcium hydroxide;
a slurry preparation process: preparing the solution rich in calcium hydroxide into desulfurization slurry; and
a roasting process: roasting the solid residues rich in calcium sulfite and calcium sulfate under the action of a reducing agent to obtain flue gas rich in sulfur dioxide and residues rich in calcium oxide.