一种去除二氧化硒中痕量金属杂质的精馏提纯方法
By combining chemical reduction and co-precipitation techniques with back pressure and precipitation maturation steps, the problems of low chemical efficiency and difficult physical separation in the removal of trace metal impurities in selenium dioxide in wet processes have been solved, and stable production of high-purity selenium dioxide has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LUXI LANTIAN HIGH TECH CO LTD
- Filing Date
- 2026-04-07
- Publication Date
- 2026-07-17
AI Technical Summary
Existing wet processes for removing trace metal impurities from selenium dioxide suffer from a mismatch between chemical reactions and physical operations, resulting in low chemical efficiency and difficulties in physical separation. Furthermore, industrial production suffers from impurity contamination and substandard product purity.
Trace metal impurities are reduced to a low oxidation state using chemical reducing agents. Ferric nitrate is added as a sacrificial iron salt auxiliary agent, and a hydrolyzable alkaline precursor is used to generate an alkali in the homogeneous phase, forming a coprecipitated flocculent. Combined with back pressure conditions and precipitation maturation steps, the pH value is ensured to rise slowly and the precipitation is stable. Subsequently, impurities are removed by thermal dehydration.
It achieves efficient removal of trace metal impurities in industrial production, ensuring product purity and recovery rate, avoiding local pH changes and foam entrainment, solving the problem of industrial filter clogging, and realizing stable production of high-purity selenium dioxide.
Smart Images
Figure CN122010062B_ABST