Cyanide Monitoring Applications

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  • Category: Monitoring & Testing ×

  • Subcategory: Cyanide Monitoring ×

Cyanide Treatment with Hydrogen Peroxide

by USP Technologies     based in Atlanta, GEORGIA (US) (USA)

Cyanides are used in a number of chemical synthesis and metallurgical processes (as simple salts or cyanide complexes). As a class, cyanides are highly toxic and must be destroyed or removed from wastewaters prior to discharge. The most common method for treating free or simple cyanide is alkaline chlorination. However, chlorination of cyanide results in highly toxic intermediates (e.g., cyanogen chloride) and, if organic material is present, chlorinated VOC’s. These compounds, together with the residual chlorine, create additional environmental problems. Consequently, there is a growing need for alternative, non-chlorine methods for destroying cyanides. Peroxygen compounds such as hydrogen peroxide, peroxymonosulfuric acid (1), and persulfates (1) are effective alternatives to alkaline chlorination for destroying free and complexed cyanides. The choice of peroxygen system depends on the reaction time available, the desired products (cyanate, or CO2 and NH3), the types of cyanides being treated (free, weak acid dissociable, or inert), and the system economics. Treatment with Hydrogen Peroxide While hydrogen peroxide will oxidize free cyanide, it is common to catalyze the reaction with a transition metal such as soluble copper, vanadium, tungsten or silver in concentrations of 5 to 50 mg/L (2).

Applications and Air Pollutants Removed in the Metal Mining Industry

by Bionomic Industries Inc.     based in Mahwah, NEW JERSEY (USA)

Complete line of wet scrubbers for all metals mining applications. Scrubbers for removal of acid gases, particulate and mists from acidulation, reaction tanks and dryers. Sulfuric acid, sulfur dioxide, ammonia and hydrogen cyanide removal. Control of micron and submicron size particulate metal fumes from rotary furnaces.   

Gas Detection Solutions for Gold Refining

by Boreal Laser Inc.     based in Edmonton, ALBERTA (CANADA)

Hydrogen Cyanide (HCN) is a highly toxic compound that is a byproduct of many industrial processes. Existing HCN point sensors are maintenance intensive, slow to respond and provide limited coverage. Many HCN sensors do not work reliably in hot or cold weather, or in humid environments. Our technology can be used for fixed monitoring applications or for temporary protection of workers during construction projects.

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