	US 12,303,915 B2
	Carbamoyl)acetamide compound in flotation of calcium-bearing minerals
Zhiyong Gao, Changsha (CN); Wanjia Zhang, Changsha (CN); Jian Cao, Changsha (CN); Yuhang Yang, Changsha (CN); Wei Sun, Changsha (CN); and Yuehua Hu, Changsha (CN)
Assigned to CENTRAL SOUTH UNIVERSITY, Changsha (CN)
Appl. No. 17/787,970
Filed by CENTRAL SOUTH UNIVERSITY, Changsha (CN)
PCT Filed Jun. 22, 2020, PCT No. PCT/CN2020/097494 § 371(c)(1), (2) Date Jun. 22, 2022, PCT Pub. No. WO2021/128771, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 201911338504.3 (CN), filed on Dec. 23, 2019.
Prior Publication US 2023/0062243 A1, Mar. 2, 2023
Int. Cl. B03D 1/01 (2006.01)

CPC B03D 1/01 (2013.01) [B03D 2201/02 (2013.01); B03D 2203/04 (2013.01)]

12 Claims

1. A method of a flotation separation of calcium-bearing minerals, comprising:

crushing and slurrying the calcium-bearing minerals to be treated to obtain an ore slurry, and

adding a flotation collector into the ore slurry for the flotation separation;

wherein the flotation collector comprises a 2-cyano-N-(substituted carbamoyl) acetamide compound, and the 2-cyano-N-(substituted carbamoyl) acetamide compound is at least one compound having a structural formula as Formula 1;

R is a hydrogen group, a C₁-C₁₅alkyl group, a C₃-C₁₅cycloalkyl group, a propenyl group, an ethynyl group, a phenyl group, a benzyl group, or a benzyloxy group; wherein a substituent group is allowed to be attached to an aromatic ring of the phenyl group, the benzyl group, or the benzyloxy group.