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Toxic Metal 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).

  • Laser & Plasma Cutting

    Laser & Plasma Cutting fumes are Unbreathable. Using laser or plasma cutting equipment on either metals or plastics introduces several known carcinogens, such as fused silica and ethyl acrylate, into the air. Occupational Health and Safety organizations recommend reducing personal exposure to the lowest level feasible. Hand held plasma cutting provides metalworkers with a quick and fast way to cut large sheets of metal material. However, plasma and oxy cutting generate a large amount of sparks, slag and fume which can contain different pollutants depending on the type of material being cut. Diversitech's line of downdraft tables incorporating the plasma cutting kit are designed to extinguish the sparks and slag, using heavy duty steel bar grating and a gravel filled baffle tray while the blower pulls away all of the toxic plasma cutting fumes. When considering how to capture and filter the fumes generated from large CNC plasma cutting and laser cutting machines, a large central dust

    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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    Waste recovery for energy & utilities

    In order to stay competitive and to be seen as being environmentally responsible, energy and utility companies are always looking for alternative routes to generate power. One method of doing this is by leveraging waste to energy incineration plants linked to the processing municipal solid waste. During this incineration process, APC residues, which are a mixture of fly ash, organic pollutants (including dioxins and furans), are generated and are classified as hazardous waste and have a detrimental environmental impact. This fly ash is subject to Air Pollution Control as it is contaminated with extremely high concentrations of heavy metals and toxic compounds like dioxins, linked to cancer and other health problems. Tetronics offers valuable waste recovery plants that can eliminate the hazardous element within the fly ash while generating an inert building aggregate with the remaining material.

    By Tetronics (International) Limited based in Swindon, UNITED KINGDOM.

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    PTR-MS systems for petrochemical industry

    Process monitoring in the petrochemical industry. Monitoring of syngas and other gas processes for safety, quality assurance and process optimization.

    By Ionicon Analytik Ges.m.b.H. based in Innsbruck, AUSTRIA.

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    Metal Stabilization

    In-situ geochemical fixation using a chemical reductant such as Remotox (calcium polysulfide) converts the soluble toxic metals into insoluble non-toxic compounds. Remotox has proven to be effective under a wide range of conditions. It is considered more stable and persistent than other reductants in subsurface environments, and is relatively safe to handle in the field and easy to apply.

    By Graus Chemicals, LLC based in Glendale, ARIZONA (USA).

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    Waste recovery for mining wastes

    Mining waste typically arises from the limitation of the installed technologies of an operation, e.g. where fines cannot be tolerated. They are associated with mine workings and often contain valuable and/or hazardous materials. The hazardous content, which are often the valuable fractions within this waste are typically metals. Spread of metal toxicants in association with tailings particles, through a combination of wind dispersion or if washed into the soil or rivers, can have a highly damaging effect on the environment. Crucially, as time moves on, the mine tailing of one generation become the resource of the next.

    By Tetronics (International) Limited based in Swindon, UNITED KINGDOM.

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