公开(公告)号：US11970441B2

公开(公告)日：2024-04-30

申请号：US16977107

申请日：2018-12-07

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Hong Zhong ,  Xiaoping Huang ,  Shuai Wang ,  Zhanfang Cao

IPC: C07C333/04 ,  B03D1/012 ,  C07C329/14

CPC classification number: C07C333/04 ,  B03D1/012 ,  C07C329/14 ,  B03D2201/02 ,  B03D2203/02

Abstract: The invention belongs to the field of mineral flotation collector materials, and particularly discloses a method for preparing thionocarbamate. In the preparation process, xanthate and 2-haloethanol are esterified to obtain O-alkyl-S-hydroxyethyl xanthate, and then O-alkyl-S-hydroxyethyl xanthate and fatty amine are reacted to obtain a mixture of thionocarbamate and 2-mercaptoethanol. The mixture of thionocarbamate and 2-mercaptoethanol is washed with alkali, and the oil phase and water phase are separated. The oil phase and water phase are thionocarbamate and 2-hydroxyethylthiolate, respectively, and 2-mercaptoethanol is obtained by washing with an acid. 2-alkylthioethanol is obtained by reacting 2-hydroxyethanethiolate with alkyl halide, and then with carbon disulfide and alkali to prepare O-alkylthioethyl xanthate. Thionocarbamate, 2-mercaptoethanol and O-alkylthioethyl xanthate prepared by this method possess high yield and high purity. The process is green and environmentally friendly, and is beneficial to the industrialization of co-production.

公开(公告)号：US10737280B2

公开(公告)日：2020-08-11

申请号：US16361156

申请日：2019-03-21

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Guangyi Liu ,  Yaoguo Huang ,  Longqun Ma ,  Xiaoxue Niu ,  Jun Liu ,  Hong Zhong ,  Zhe Hu

IPC: B03D1/02 ,  B03D1/012

Abstract: The present invention relates to an azolethione flotation collector and application thereof. According to the application, an azolethione compound such as a 1,3,4-thiadiazole-2-thione compound, a 1,3,4-oxadiazole-2-thione compound, a 1,2,4-triazole-3-thione compound or a 1,2,4,5-tetrazole-3-thione compound is used as a mineral flotation collector to be applied to ores containing copper, zinc, lead, nickel, cobalt, platinum, palladium, silver or gold minerals to realize flotation recovery of valuable metal minerals. Compared with common flotation collectors in the existing technologies, the flotation collector of the present invention can effectively improve enrichment and recovery of copper, zinc, lead, nickel, cobalt, platinum, palladium, silver or gold minerals.

公开(公告)号：US12054452B2

公开(公告)日：2024-08-06

申请号：US17005324

申请日：2020-08-28

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Hong Zhong ,  Xin Ma ,  Shuai Wang

IPC: C07C329/16 ,  B03D1/002 ,  B03D1/14

CPC classification number: C07C329/16 ,  B03D1/002 ,  B03D1/14 ,  B03D2201/007 ,  B03D2201/02 ,  B03D2203/02

Abstract: A method for preparing xanthate by a slurry method includes steps of: adding a mixture of dichloromethane and carbon disulfide as a reaction solvent in a slurry reactor, and then adding alcohol and caustic alkali to react with carbon disulfide under less than 1 atm to remove heat released by the reaction by evaporating the solvent; performing vacuum distillation after the reaction to remove the solvent and water, so as to obtain the xanthate; transporting the xanthate to a granulation equipment for granulating, and then drying in a drying equipment to obtain a product. The method is performed in a system formed by a reaction equipment, a solvent recovery equipment, the granulation equipment, and the drying equipment, wherein a main equipment of the reaction system is a slurry reactor. The method has advantages of high efficiency, low energy consumption, good safety, environmental friendliness, convenient operation and the like.