US 12,392,013 B2
Method and apparatus for sodium slag recovery
Junqing Pan, Beijing (CN); Qiuchen Wang, Beijing (CN); Keyu Wang, Beijing (CN); Yan Chen, Inner Mongolia (CN); and Yanzhi Sun, Beijing (CN)
Assigned to BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY, Beijing (CN); and INNER MONGOLIA RUIXIN CHEMICAL CO., LTD, Inner Mongolia (CN)
Filed by BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY, Beijing (CN); and INNER MONGOLIA RUIXIN CHEMICAL CO., LTD, Inner Mongolia (CN)
Filed on Nov. 28, 2022, as Appl. No. 18/070,250.
Claims priority of application No. 202210394618.5 (CN), filed on Apr. 14, 2022.
Prior Publication US 2023/0332271 A1, Oct. 19, 2023
Int. Cl. C22B 26/10 (2006.01); C22B 1/02 (2006.01); C22B 7/00 (2006.01); C22B 7/04 (2006.01)
CPC C22B 26/10 (2013.01) [C22B 1/02 (2013.01); C22B 7/008 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for sodium slag recovery, the method comprising:
(1) subjecting a liquid sodium slag to a gravity stratification to obtain pure metallic sodium and high calcium content sodium slag;
(2) roasting said high calcium content sodium slag to obtain a roasting slag; and
(3) leaching said roasting slag by using an alkaline liquor to obtain a sodium hydroxide solution and calcium hydroxide,
wherein the gravity stratification in step (1) is a supergravity centrifugation,
wherein a separation factor of the supergravity centrifugation in step (1) is within a range of 500-5,500, and
wherein the time for said supergravity centrifugation is within a range of 1-500 minutes.