公开(公告)号：US20210309533A1

公开(公告)日：2021-10-07

申请号：US17351083

申请日：2021-06-17

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Yufeng WU ,  Gongqi LIU ,  De-an PAN

IPC: C01D3/10 ,  C22B1/06 ,  C01D3/18 ,  C22B26/10

Abstract: A method for purifying sodium bromide by the waste circuit board pyrolysis coke, belonging to the field of purifying sodium bromide and high-value utilization, and more particularly, relating to a method for reducing and purifying crude bromine salt enriched from waste circuit board smelting ash by using waste circuit boards pyrolysis coke. The main steps are as follows: carbonization conversion, purification filtration and vacuum exsolution. The pure sodium bromide crystal was obtained by reducing crude bromine salt enriched from waste circuit board smelting ash by using coke in waste circuit board pyrolysis residues, realizing the resource coupling and high-value utilization of the two wastes, avoiding the secondary pollution in the process of recycling the waste circuit boards. It has the characteristics of simple operation, high resource utilization rate and no tail liquid discharge.

公开(公告)号：US20220356067A1

公开(公告)日：2022-11-10

申请号：US17867618

申请日：2022-07-18

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Yufeng WU ,  Gongqi LIU ,  De-an PAN

IPC: C01D3/10 ,  C01D3/16 ,  C22B1/06 ,  C22B26/10

Abstract: A method for producing and purifying sodium bromide using the coke from waste circuit boards pyrolysis residues as reducing agent, belonging to the field of purifying sodium bromide and high-value utilization, and more particularly, relating to a method for reducing and purifying crude bromine salt obtained from waste circuit boards smelting ash by using the coke in waste circuit boards pyrolysis residues. The main steps are as follows: carbonization conversion, water dissolution, filtration, and concentrated crystallization under vacuum heating. The pure sodium bromide was obtained by reducing crude bromine salt enriched from waste circuit board smelting ash by using the coke in waste circuit boards pyrolysis residues, realizing the resource coupling and high-value utilization of the two wastes, avoiding the secondary pollution in the process of recycling the waste circuit boards. It has the characteristics of simple operation, high resource utilization rate and no tail liquid discharge.