Leaching behavior of CRT funnel glass

Yamashita, Masaru; Wannagon, Anucha; Matsumoto, Sachiko; Akai, Tomoko; Sugita, Haruo; Imoto, Yukari; Komai, Takeshi; Sakanakura, Hirofumi

doi:10.1016/j.jhazmat.2010.08.002

Cited by 37 publications

(19 citation statements)

References 23 publications

(30 reference statements)

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“…The lines on these figures are drawn as a visual aid. The results for funnel glass at 248 and 364 days was on the extension line of the previous results 12) again. Alkali and Pb elements were soluble in comparison to other elements.…”

Section: Leaching In Acidic Solutionsupporting

confidence: 89%

“…The experimental conditions agree with those reported in our previous study. 12) After the test in alkaline condition at pH 11.0, the leachant solution was acidified with one drop of HCl so as to dissolve all hydroxide precipitates after removal of the sample from the vessel. We measured the weight of the sample before and after the test and calculated the total mass loss (ML) from the weight change.…”

Section: ¹1mentioning

confidence: 99%

“…We have studied funnel glass leaching 12) and made the following observations. Under acidic conditions, leaching starts via ion exchange between alkali and hydronium ions in a diffusioncontrolled reaction; this mechanism is similar to that observed for other types of Pb glass.…”

Section: Introductionmentioning

confidence: 99%

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Leaching behavior of cathode ray tube (CRT) glasses

Yamashita

Matsumoto

Akai

et al. 2014

J. Ceram. Soc. Japan

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The leaching behavior of cathode ray tube (CRT) funnel and neck glasses were compared in 0.001 N HCl and 0.001 N NaOH at 70 and 90°C. We measured the weight loss and leached amount of each component and observed the surface changes by scanning electron microscopy (SEM). In acid solution funnel glass showed t 1/2 -dependent leaching, whereas neck glass only demonstrated congruent dissolution after 8 weeks. In basic solutions leaching behavior was almost equivalent for both types of glass. Dissolution halted after one or two weeks as a result of the deposition of a protective layer. This layer was formed by saturation of Pb and was subsequently dissolvable by refreshing the leachant solution.

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Section: Leaching In Acidic Solutionsupporting

confidence: 89%

Section: ¹1mentioning

confidence: 99%

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Leaching behavior of cathode ray tube (CRT) glasses

Yamashita

Matsumoto

Akai

et al. 2014

J. Ceram. Soc. Japan

Self Cite

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“…One research study reported on the leaching behavior of CRT funnel glass pieces of a given size and protective layer formed during the leaching process (Yamashita et al, 2010). However, to the best of our knowledge, the structural changes in activated CRT funnel powder after leaching has not been reported.…”

Section: Characterization Of Samples After Acid Leachingmentioning

confidence: 95%

Lead recovery from cathode ray tube funnel glass with mechanical activation

Yuan

Zhang

et al. 2012

Journal of the Air & Waste Management Association

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In the disposal of electronic waste, cathode ray tube (CRT) funnel glass remains an urgent environmental problem because of its high lead content. This research developed mechanical activation as a pretreatment process, and it proved to be an effective method for extracting lead from CRT funnel glass. The effects of mechanical activation on the structural changes of CRT funnel glass were investigated using X-ray diffraction (XRD), particle size analysis, specific surface area (SSA), and a scanning electron microscope (SEM). Nitric acid leaching behaviors of the activated CRT funnel glass were studied by varying several parameters: leaching time, liquid-to-solid ratio, acid concentration, and heating temperature, as well as various conditions of activation. The lead recovery rate was observed to increase rapidly, particularly with increases in activation time and leaching temperature, but to vary relatively less under other experimental parameters. Under the optimal leaching conditions, the lead recovery rate for funnel glass activated for 2 hr at the rotational speed of 500 rpm (by ball mill) reached 92.5%, compared with 1.2% from the unactivated sample.Implications: CRT funnel glass containing lead has become a serious environmental problem facing the whole world. In order to dispose of CRT funnel glass, some technologies have been developed. However, these technologies are associated with higher operation and maintenance costs. In this study, mechanical activation was introduced to change the physicochemical properties of CRT funnel glass, which can transform the glass into an easily dissolved one. Under atmospheric pressure leaching conditions, good recovery rate for lead can be achieved and the residue has wide uses. The process can be applied to treat other leaded glass or leadcontaining wastes.

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“…The high lead content of the CRT glass and the numerous difficulties involved in lead removal have left landfilling as the only viable disposal option. However, leaching of lead from the CRT glass might result in contamination of the ground water and soil, and therefore (Yamashita et al 2010), landfilling of this type of waste has been banned (Yot and Méar 2009;Yamashita et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Removal of lead from cathode ray tube funnel glass by chloride volatilization

Grause

Yamamoto

Kameda

et al. 2013

Int. J. Environ. Sci. Technol.

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Cathode ray tube funnel glass is an environmentally problematic relict of old television sets. In particular, landfilling of this material is strongly discouraged because of its high lead content. However, recovery of this toxic lead could prevent its release into the environment and allow its reuse. In this research, lead was separated from the glass matrix by a chloride volatilization process. Melting of the funnel glass together with CaCl 2 resulted in the volatilization of 80 % of lead at 1,000°C. The use of NaCl as a chlorination agent yielded less volatile lead, while poly(vinyl chloride) and gaseous HCl proved to be ineffective chlorination agents. The differences in the chlorination agent efficiencies could be attributed to differences in the corresponding formation of silicates. Energy-dispersive X-ray spectroscopy showed that diffusion plays an important role in the volatilization of PbCl 2 .

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Leaching behavior of CRT funnel glass

Cited by 37 publications

References 23 publications

Leaching behavior of cathode ray tube (CRT) glasses

Leaching behavior of cathode ray tube (CRT) glasses

Lead recovery from cathode ray tube funnel glass with mechanical activation

Removal of lead from cathode ray tube funnel glass by chloride volatilization

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