Merrill–Crowe process
The Merrill–Crowe Process is a separation technique for removing
The solution is separated from the ore by methods such as
Automated membrane filtration offers a cost savings alternative to CCD. Both applications are compared in detail by K. McGrew, 2016.
The gold precipitate (mixed with zinc dust) is then filtered out of the solution, and the zinc dust and gold are mixed with sulfuric acid to dissolve the zinc. The solution is filtered, and the remaining solids are smelted to a gold dore bar. These bars are sent to a refinery to remove the copper and silver, the specific process used depending upon the impurities in the gold.[4]
The basic process was discovered and patented by Charles Washington Merrill around 1900, and later refined by Thomas Bennett Crowe, working for the Merrill Company.[5]
See also
- Other gold cyanidation techniques:
References
- ISSN 0167-4528.
- ^ The Merrill Crowe Recovery Process, Denver Mineral Engineers Inc.
- ^ Wong Wai Leong Eugene/Arun S. Mujumdar, National University of Singapure (March 2009). "Gold Extraction and Recovery Process" (PDF). Archived from the original (PDF) on 2012-08-13.
- ^ Gold Avenue Encyclopaedia, A-Z Glossary Archived 2013-07-07 at the Wayback Machine
- ^ Ryder, David Warren, The Merrill story : (being a record of the life and achievements of Charles Washington Merrill, and a history of the Merrill Company and subsidiaries), Merrill Co., 1958.