Yellow phosphorus tail gas purifying method

• Main Authors: WANG ZHENGQIANG, XIE HAOJIANG, XU HUIYUAN
• Format: Patent
• Language: Chinese; English
• Published: 28.05.2021
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a yellow phosphorus tail gas purifying method which comprises the following steps: S1, removing dust particles in yellow phosphorus tail gas by adopting a metal film filtering device to obtain dust-removed tail gas; s2, sequentially carrying out normal-temperature water washing and low-temperature water washing on the dedusting tail gas to cool the dedusting tail gas to obtain cooled tail gas and crude phosphorus ; s3, oxidizing the cooled tail gas by adopting hydrogen peroxide to obtain oxidized tail gas; s4, absorbing the oxidized tail gas by adopting a copper sulfate solution to obtain absorbed tail gas; and S5, re-absorbing the absorbed tail gas by using liquid caustic soda to obtain purified tail gas. The method has the advantages that the treatment cost is low, and the purified tail gas can reach a high-quality index and can completely meet the requirement that the tail gas can be used as raw materials of carbon-1 products such as formic acid and sodium formate or can be used as