US 12,351,473 B1
Process method for preparing magnesium oxide from dolomite
Yongzhen Wang, Taiyuan (CN); Chong Zhang, Taiyuan (CN); Deyin Wang, Taiyuan (CN); and Xiaomin Wang, Taiyuan (CN)
Assigned to Taiyuan University of Technology, Taiyuan (CN)
Filed by Taiyuan University of Technology, Taiyuan (CN)
Filed on Jan. 3, 2025, as Appl. No. 19/008,700.
Claims priority of application No. 202410578967.1 (CN), filed on May 10, 2024.
Int. Cl. C01F 5/06 (2006.01); B01D 11/02 (2006.01)
CPC C01F 5/06 (2013.01) [B01D 11/0288 (2013.01); C01P 2002/72 (2013.01); C01P 2006/80 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A process method for preparing magnesium oxide from a dolomite, comprising the following steps:
S1, calcining the dolomite to obtain a calcined dolomite;
S2, hydrating the calcined dolomite according to a solid-liquid ratio, controlling a hydration temperature and a hydration time, filtering, washing, and drying after a hydration to obtain a hydration product; wherein the solid-liquid ratio of the calcined dolomite is 0.5-2 g/L, the hydration temperature is 40-90° C., the hydration time is 0.5-1.5 h, and a stirring speed of the hydration is 30-90 r/min;
S3, using a sodium hydroxide solution to adjust a pH value of a complex solution to 8-10; wherein a complexing agent is at least one of ethylenediaminetetraacetic acid disodium, triethanolamine, oxalic acid, and citric acid; and
S4, performing a complexation reaction by mixing a hydration product in the step S2 with the complex solution in the step S3, controlling a complexation temperature and a complexation time, obtaining the magnesium oxide by filtering, washing, and drying after the complexation reaction is completed, wherein the complexation temperature is 40-90° C., the complexation time is 10-40 min, and a stirring speed of the complexation reaction is 30-90 r/min.