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| Environmental Technology Listing |
Title of Listing: | | Recycle of Metal and Cyanide Ions |
Category: | | Treatment Technologies |
Subcategory: | * | Soil, All Listings |
Media: | | Soil, Sludge |
Contaminants: | | Metals compelled with cyanide: nickel chloride (NiCl2), cadmium sulfate (CdSO4), copper sulfate (CuSO4), ferrous nitrite (Fe(NO3)3), zinc sulfate (ZnSO4), mixtures of all F007, F008, F009, F010, F011, F012 wastes. |
Web Site: | | |
Email: | | 73554.1354@compuserve.com |
Technology Description: | |
CHEMICAL TREATMENT - OTHER
Our premise is based on currently used processing methods and new technology. A metal contaminated site is excavated the same way precious metals are mined. The dirt is piled on a liner or pad. Cyanide is sprayed on the dirt and collected when it reaches the liner. The metal-cyanide solution is stripped of the cyanide and the metals are filtered.
Recycle of metal and cyanide ions by means of Acidification- Volatilization and Recovery (AVR) is a viable method to reduce the cost of cleanup. The above-ground process begins when the solution or slurry is pumped into the stripping column. Acid is then metered into the column forming HCN. HCN gas is swept into adsorption column of caustic thereby making sodium cyanide available for reuse. System is closed loop with double wall constructed for potential gas entrapment. Monitors and alarms are placed at critical points.
Cyanide solution of complexed metal is "uncomplexed" or broken making processing of the metals much simpler and cost-effective. Process can be batch or continuous. Companies who make cyanide use a continuous process. Residual cyanide in soil is oxidized.
AVR Technology is superior to oxidizing or hypochloriting metal-cyanide solutions from a technical, environment and economic point of view.
Separation of metal cations leads to the more efficient removals in uncomplexed form. Dependent on the effluent, efficiencies of 97.3 to 100 percent were achieved.
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Performance Status/
Limitations: | |
Performance Status:
AVR technology has been used for many years in other countries. Currently several gold mining operations are using this technology in New Zealand and Canada. Most laboratory analyses of cyanide concentrations use technology similar to this process.
Limitations:
The waste must be pumpable. The process is based on liquid flowing down a packed column against a counter-current flow of air sweeping gas to an adsorption column. The process is applicable only for sludge containing cyanide.
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Topics
Chemicals, Inorganics/Metals, Technologies, Treatment/Remediation
Additional Topics/Tags/Keywords
Acidification-Volatilization and Recovery |
Organization: | | VIKING INDUSTRIES |
Address: | | 911 G. Samsonite Boulevard
| Phone: | Description | Number |
City: | | Murfreesboro | | Primary | (615) 890-1018 |
State/Province/Territory: | | TN | 2. | | |
Zip/Postal Code: | | 37130 | 3. | | |
Country: | | United States | 4. | Fax: | (615) 890-9932 |
Branch Locations: | |
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