CRT Glass Research Articles

Effect of Disagglomeration on the Recovery of Abrasives from Waste Sludge

ABSTRACT Effect of disagglomeration with different type of mill on recovery of abrasives was investigated. To evaluate an effect of disagglomeration on recovery of abrasive from waste sludge, disagglomerated waste sludge by different mills were air classified and yield of fine particles product were calculated. The results suggested that pin mill and jet mill are effective for disagglomeration of waste sludge. Pumice, garnet and rouge powders were easily recovered by air classification after disagglomeration by pin mill for the recycling of them as a abrasive powders in polishing procedure of CRT glass. Comparing to raw abrasive powders, shapes and mineralogical properties were very similar to those of new ones. These results suggest that the recycled abrasive powders can be used as an abrasive powders.

Recycling of EOL CRT glass into ceramic glaze formulations and its environmental impact by LCA approach

Recycling of EOL CRT glass into ceramic glaze formulations and its environmental impact by LCA approach

Recycling of EOL CRT glass into ceramic glaze formulations and its environmental impact by LCA approach

Background, Aims and Scope The interest in recycling materials at the end of their life is growing in the industry in general. As regards the Wastes of Electrical and Electronic Equipment (WEEE), an appreciable increase of these materials has been noticed in the last decades, 117 · 103 tons of WEEE have been produced in Italy in 2002 according to Ecohitech [1] and the increase in this kind of waste is three times higher than that of the municipal waste according to the FISE ASSOAMBIENTE report [2]. Within WEEE, End-of-Life Cathode Ray Tube (EOL CRT) glass, the main part of TV sets and PC monitors, is here analysed using both a technical approach to establish a possible reuse of the glass in a open-loop recycling field (ceramic industry) and a methodology (LCA) capable of providing environmental evaluations.

Recent Advances in Strenthening Glass Material for CRT

The important thing in order that the CRT still shines brightly for the coming digital era might be to realize a super-lightweight and ultra thin CRT, keeping its advantages such as high image quality and low cost. One of the reasons that CRT is heavy and fragile is due to the high density of CRT glass resulted from its high X-ray absorption ability. However, it might become an impetus for realizing such an innovative CRT by introducing new CRT glass with lower density and lower brittleness. This could be possible if a new electron gun with excellent focusing characteristics even at very low accelerating voltages would be developed. In addition, we have had some advances in strengthening glass material such as field-assisted chemical tempering and improvement of the mechanical strength of a crystalline solder glass. These also will produce a possibility to innovate CRTs.

13.2: Impact behavior of CRT bulbs with tempered panel glass

AbstractThe mechanical behavior at the impact of a tempered CRT bulb is discussed. The surface strength of a glass bulb is able to be improved by tempering, but excessive tempering causes self‐crack propagation and degrades implosion‐proof characteristics. From our several impact tests and experiments, the most desirable intensity range of tempering for CRT glass bulbs has been found.

Computer monitor recycling: a case study

The total number of computer monitors being scrapped per year worldwide is predicted to rise to 30 million units by the year 2005. Monitors contain significant quantities of lead (in the solder and CRT glass) and polybrominated flame retardants, which are potentially hazardous if released to the environment. A recent study investigated the possibility of cost-effectively recycling monitors.

中性子放射化法によるギプス用セッコウ中のウラン濃度の定量

Concentrations of uranium were measured, by neutron activation analysis, in gypsum used in a plaster cast. The gypsum samples were powdered and mixed thoroughly using an agate mortar. Measurements of uranium were made by detecting γ-rays from 239U, since those from 239Np (a daughter nuclide of 239U) cannot be detected because of the high background of bremsstrahlungs due to β-rays from 32P produced by an (n, p) reaction of 32S in gypsum. The results of these measurements showed the concentration of uranium to be 0.0358±0.0030ppm, which was much lower than that in other samples such as CRT glass and concrete blocks measured previously. This lower concentration probably results from the fact that the gypsum used in the present study was manufactured as a by-product of phcsphatic fertilizer from phosphate rock.

Mass spectrometric evaluation of the desorption properties of some glasses under high applied voltage conditions

The manufacture of vacuum devices such as lamps, electronic tubes and displays requires a careful evaluation of the desorption properties of glasses under specific operating conditions. An exceedingly high gas load can detrimentally affect the vacuum and reduce the overall device performances. In the present study, the effects of the application under vacuum of high voltages (3–9 kV) on a CRT and two soda lime glasses were investigated, as a function of the glass temperature (60–100 °C). Outgassed species were collected by a quadrupole mass spectrometer which was mounted with the ion source close to and in direct view of the sample, to minimize the reactive gas species loss due to surface interactions and recombination. The release of oxygen and oxygenated gases from soda lime glasses upon high voltage application was measured, providing some evidence that electrolytically induced ionic transport phenomena take place through the glass network under these conditions. A comparatively lower outgassing rate from the CRT glass was measured.

The X-ray and -ray absorption coefficients of a number of glasses

From published data, the X-ray absorption coefficients of a number of glasses have been computed over a wavelength range of 0.01-1.0 A. The glasses are clear white plate, ceria stabilized plate, 1060 CRT glass, light barium crown 541595, lead plate glass and double extra dense flint glass 927210. The mass absorption coefficients for most oxides used in glassmaking are plotted as a function of wavelength, and a method of calculating the absorption coefficient of any glass from its composition and this graph is presented. Lead equivalents for the γ-ray region of some glasses are given as a function of glass density. The glasses considered are ceria stabilized plate; the barium series 541595, 572577, 612585 and 623603; and the lead series 653335, 700303, 748278, 801255, 927210 and lead plate glass. (The numbers given are the type reference numbers given in the catalogue of Chance optical glass.)