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toxic metals removal Applications

  • Soldering Fume Extraction

    Soldering fumes are Unbreathable. Soldering enables the joining of metal parts by melting a filler metal to attach wires and other metallic components. The fumes generated from melting solder especially solder containing Lead or Tin present are dangerous and require local ventilation to remove harmful smoke from the work area. Soldering application need to be properly ventilated to prevent toxic fumes from reaching the worker`s breathing zone. There are a number of different industries such as the electronics assembly industry and electronics repair comapnies who must deal with the hazards of solder smoke. Fumes created by automated PCB soldering including wave soldering machines, handheld soldering irons, torch brazing and furnance brazing are often ignored because of the small volume of smoke generated. However, these applications still require careful consideration as dangerous fumes can impair employee’s respiratory tracts depending on the filler metals used. Because manual soldering applications require working with tiny components, workers end up positioning their heads right above toxic rosin or lead solder fumes with a direct exposure into their throat, nasal passages and lungs, and as a result, they can experience respiratory complications. Rosin irritation can cause various side effects and the inhalation of lead fumes is carcinogenic. As lead oxide smoke collects in your lungs, it can be transferred into your bloodstream. Diversitech recommends installing soldering fume extraction equipment to prevent the inhalation of dangerous fumes. These ventilation units will not only protect each person working at a soldering station when installed and positioned correctly, but they will also prevent fumes from contaminating other worker’s lungs.?

    By DiversiTech based in Montreal, QUEBEC (CANADA).

  • 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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