Glass-ceramics obtained by the recycling of end of life cathode ray tubes glasses

Andreola, F.; Barbieri, Luisa; Corradi, A. Bonamartini; Lancellotti, Isabella; Falcone, Roberto; Hreglich, Sandro

doi:10.1016/j.wasman.2004.12.007

Cited by 96 publications

(49 citation statements)

References 1 publication

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“…Bhd., where funnel glass is commercially produced from recycled cullets. The empirical formulae of the funnel and neck glasses were 51.6SiO 2 ·23.1PbO·7.7K 2 26) Sample preparation for funnel glass has been described elsewhere.…”

Section: Methodsmentioning

confidence: 99%

“…12) The surface area (SA) of the sample was approximately 400 mm 2 and the volume of the leaching solution (V) was 40 cm 3 , giving an SA/V ratio of 10 m…”

Section: Methodsmentioning

confidence: 99%

“…These materials are recycled to produce new CRT glass; however, with the advent of flat-panel displays, demand for CRTs is decreasing along with any initiatives for their reuse. New uses of CRT cullet are being investigated, such as in bricks and tiles, 1) glass ceramics, 2) high-strength mortars 3) and X-rayshielding cement. 4) In some cases, the Pb component of CRT glass makes it difficult to treat the waste as a recyclable resource.…”

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: Methodsmentioning

confidence: 99%

“…12) The surface area (SA) of the sample was approximately 400 mm 2 and the volume of the leaching solution (V) was 40 cm 3 , giving an SA/V ratio of 10 m…”

Section: Methodsmentioning

confidence: 99%

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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“…One of them is to use it in the manufacturing of other monitors but the method becomes useless due to the low demand of CRT monitors [13]. Another method involve using these materials as flux in glass and ceramics industry [14][15][16][17].These technologies limit the content of toxic oxides, mainly PbO. As a result, a separation of glass waste containing lead is required.…”

Section: Introductionmentioning

confidence: 99%

Study of (Pb, Ba) - CRT glass waste behavior as a partial aggregate replacement in cement mortars

Hornea¹,

Gorea²,

Har³

2017

Studia UBB Chemia

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This study investigates the usability of the cathode ray tube (CRT) glass waste in a binder system. The raw materials -glass waste, river sand and cement were characterised. CRT waste was added in the amount of 30, 40 to 50 weight percent, as replacement for river sand. Glass chemical composition shows a high content in lead and alkaline oxides. Mortar prisms were prepared and kept under humid conditions. The mechanical properties were studied after 7, 28 and 90 days respectively. SEM with additional EDS was used in order to investigate the microstructure of the samples. All the samples containing glass waste achieved higher compressive strength than the control mortar. After 14, 28 and 42 days of maintaining the mortar in water no evidence of Pb was detected in the solutions.

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“…Many studies have been carried out on the recycling of scrap CRT glass to manufacture other products, such as foam glass (Méar et al, 2006a(Méar et al, , 2006cBernardo and Albertini, 2006), ceramic glaze (Andreola et al, 2005b(Andreola et al, , 2007Bernardo, 2007), flux (Andreola et al, 2008), fine aggregate in cement mortar (Ling and Poon, 2011), crystalline silicotitanate (Chen et al, 2010), and so on. These solutions would be sufficient if there were not potential environmental risks from the lead remaining in the products made from waste CRT glass.…”

Section: Introductionmentioning

confidence: 99%

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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Glass-ceramics obtained by the recycling of end of life cathode ray tubes glasses

Cited by 96 publications

References 1 publication

Leaching behavior of cathode ray tube (CRT) glasses

Leaching behavior of cathode ray tube (CRT) glasses

Study of (Pb, Ba) - CRT glass waste behavior as a partial aggregate replacement in cement mortars

Lead recovery from cathode ray tube funnel glass with mechanical activation

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