Method for recovering silver from waste silver catalyst
A silver catalyst and slagging agent technology, applied in the field of silver recovery, can solve the problems of large environmental pollution, high silver content, and reduced silver recovery rate
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0023] Example one
[0024] Waste silver catalyst used in ethylene oxidation to ethylene oxide, carrier is α-Al 2 O 3 , The silver content is 16.84%, and the alumina content is 83.16%. First grind the waste silver catalyst to 100 mesh, take 500 grams of the ground waste silver catalyst, add 420 grams of lime (CaO), mix thoroughly, put it in a graphite crucible, heat it in a silicon-molybdenum rod high-temperature box-type electric furnace, and increase the temperature. The temperature is kept at 1500°C for 5 hours, and then cooled to normal temperature. The slag phase is separated from the metallic silver phase to obtain 83.27 grams of silver. The recovery rate of silver is 98.9% and the purity of silver is greater than 99.8%.
Example Embodiment
[0025] Example two
[0026] Take 500 g of the waste silver catalyst that has been ground in Example 1, add 420 g of lime (CaO), mix well, put it in a graphite crucible, and heat it in a silicon-molybdenum rod high-temperature box-type electric furnace. After hours, cooling to room temperature, the slag phase is separated from the metallic silver phase, and 83.52 grams of silver is obtained. The silver recovery rate is 99.19%, and the silver purity is greater than 99.8%.
Example Embodiment
[0027] Example three
[0028] Take 500 g of the waste silver catalyst that has been ground in Example 1, add 420 g of lime (CaO), mix it thoroughly, put it in a graphite crucible, and heat it in a silicon-molybdenum rod high-temperature box-type electric furnace. After hours, cooling to normal temperature, the slag phase is separated from the metallic silver phase, and 83.73 grams of silver is obtained. The silver recovery rate is 99.44%, and the silver purity is greater than 99.8%.
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap