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Cathode ray tube monitors The CRT used in television and computer screens represents one of the main sources of e-waste as flat screens have them over the last ten years Lecler et al. The obtained results encouraged a study regarding the hazard potential of CRT monitors. Services on Demand Journal. Characteristics of fired clay bricks with waste marble powder addition as building materials. Coal mine wastes recycling for recovery and eco—friendly bricks production. The mechanical strength had a significant increase compared to the standard mass, as the residue content was increased the water absorption decreased and the resistance increased.
Which for companies this is of fundamentally important because it guarantees the quality of the final product. Lead hazard evaluation for cathode ray tube monitors in Brazil The glass has three components: The ideal moisture for making these specimens is determined by the Pfefferkorn plasticity assay. This dam is located in the county of Mariana and it is mainly used to retain the waste resulting from the iron ore treatment at the Germano Plant.
This is an open access article distributed under the terms of the Creative Commons Attribution Licenseavnt permits unrestricted use, distribution, and build upon your work non-commercially. A capacidade que este mineral apresenta para adsorver metais pesados tem despertado abnr de alguns autores. However, this practice has caused serious environmental problems. The panel component is the heaviest part and it contains elements such as barium, strontium, and yttrium.
The samples are press with diameters of 73 mm and thickness of 15 mm identified, weighed, and measured. Journal of Thermal Analysisv. Study for vitreous waste recovery in the formulation of heavy clay ceramics Publications Office of the European Union; For this procedure the weighings of the Standard Mass STD and also of the waste were carried out with a balance electronic mark, model SF with a maximum capacity of 10 kg.
Silica is found in several mineralogical phases, clayey and non-clayey, especially quartz its purest natural form and kaolinite Al 2 Si 2 O 5 OH 4. The waste was classified based on the American methodology SW B, 29 and the Brazilian technical references: Bases para o futuro. Seven CRTs monitors were submitted to the Brazilian standard leaching procedure to evaluate their hazard potential. The NBR displays abntt list of known hazardous materials and their characteristics and can be related to the Code of Federal Regulations title 40, subtitle of the United States 40 C.
Effect on aesthetic quality and physical properties. The CRTs were split into three, according to the previous delimitation Fig. Adapted from ABNT b. Samples C and E were placed in the furnace with no reducing agent. The panel glass did not present any leached lead, which is logical, since no lead was found in the previous XRF Table 4.
This statement encourages researches that aim to remove the lead from the waste CRT. The manufacture of red ceramics is able to absorb high amounts of solid residues from several segments, mainly due to the large volumes involved, allows greater tolerance in the composition of its mass.
Characterisation of fired—clay bricks incorporating biosolids and the effect of heating rate on properties of bricks.
Geochimica et Cosmochimica Actav. How to cite this article. The funnel glasses from different CRT were all mixed together. The technological properties evaluated were linear annt retraction of drying and firing, loss on fire, water absorption and mechanical resistance. The big variance among the samples is probably related to the year the monitors were manufactured. The results also indicated that the residue is not flammable. Abstract Cathode ray tube CRT monitors are electronic equipment mainly made of glass, polymers abbnt metals.
There was a problem providing the content you requested As reported in several international publications, waste of CRT monitors represents an environmental threat and yet it has not been classified under Brazilian law. The waste it is a ceramic sludge, rich in vitreous and fluxing materials that if deposited in inappropriate places cause contamination of the environment. Formulations F5 and F6 showed higher strength 5.
The next step was intended to evaluate whether the lead removal had been able to convert the CRT from a hazardous waste to a non-hazardous waste according to the Brazilian regulation. This procedure was adopted in order to guarantee the same conditions established by the industrial process.
Journal of Cleaner Production. Therefore, recycling or re-use within the same process can be a reasonable way of preserving the environment. The lead concentration in the leached solution demonstrates that CRT monitors are a hazardous waste to the environment and are classified as Class I — Dangerous Waste according to NBR According to Menadthe lead in the CRTs is responsible for the radiation shielding and for stabilizing the glass. Click here to submit your manuscript Segundo van Geen et al.
Chemical and mineralogical characterization tests of the raw materials carried out. Influence of adsorbed anions on the dehydroxylation of synthetic goethite. TOP Related Posts.
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