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Cyanide Monitoring Applications

  • Cyanide Treatment with Hydrogen Peroxide

    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).

    By USP Technologies based in Atlanta, GEORGIA (US) (USA).

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    Applications and Air Pollutants Removed in the Metal Mining Industry

    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.   

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

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    Gas Detection Solutions for Gold Refining

    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.

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

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    Measurement solution for carbon fibre manufacture

    Carbon fibre is a unique material and is found in many high-tech industries such as sports car manufacture, wind turbine blade construction and sports equipment. The production of carbon fibre from acrylic fibre involves the baking of the fibre in ovens, which gives emissions of gas species including Hydrogen Cyanide (HCN). Protea’s range of gas analysers can provide a solution for the periodic or continuous measurement of gases from carbon fibre production in order to give reportable emissions values as required by legislation.

    By Protea Limited based in Middlewich, UNITED KINGDOM.

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