公开(公告)号：US20240010507A1

公开(公告)日：2024-01-11

申请号：US17626805

申请日：2021-09-18

Applicant: Beijing University of Technology

Inventor： Dean Pan ,  Guanjun Li

IPC: C01D3/10 ,  B01D11/04 ,  B01D9/00

CPC classification number: C01D3/10 ,  B01D11/0492 ,  B01D9/0018 ,  B01D11/0488

Abstract: The invention belongs to the field of bromine recovery from waste circuit board, and particularly relates to a method for recovering high-purity sodium bromide from bromine-containing crude salt. The invention mainly includes the steps of acidification oxidation, multi-stage extraction, and cooperative back extraction. Compared with traditional chlorine oxidation and single urea back extraction technology, the acidification oxidation process can be effectively controlled by reasonable adjustment of the added amount of hydrochloric acid and sodium chlorate, and the tail gas can be absorbed and reused to avoid secondary pollution and resource waste. At the same time, urea is used with sodium carbonate for cooperative back extraction to achieve a high back extraction rate which greatly reduces the amount of urea, and obtains high-purity sodium bromide crystals. The efficient recovery of bromine resources in bromine-containing crude salt is realised. The benefits of the invention are: high product purity, simple operation, environmental friendliness.