Reuse of ornamental rock-cutting waste in aluminous porcelain

Silva, M.A.; Paes, Herval Ramos; Holanda, José Nilson França de

doi:10.1016/j.jenvman.2010.10.060

Cited by 19 publications

(12 citation statements)

References 23 publications

(20 reference statements)

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“…The apparent density was measured by the Archimedes method. The volume electrical resistivity measurements, determined by the method of two points, were performed by using a digital multimeter with 8 1/2 digits (3458A model, Argilent Technologies), a programmable voltage source (52620G model, Tektromix P), and two conductive plates involving the specimens that were painted with silver conductive ink 8 . X-ray diffraction analysis was carried out on fired specimens in order to qualitatively evaluate the mineral phases.…”

Section: Resultsmentioning

confidence: 99%

“…The aluminous porcelain formulations consist mainly of a mixture of clay (kaolin and/or plastic clay), fluxing material (feldspars), and filler (alumina) 5,8 . After firing at high temperature, the aluminous porcelain is characterized by a highly dense microstructure composed of mullite and alumina particles embedded in an abundant glassy matrix.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of Lead Containing TV Tube Glass Waste in Aluminous Porcelain

2017

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The aim of this work was to study the incorporation of lead containing TV tube glass waste as a method to provide alternative raw material for aluminous electrical porcelain. For this purpose, aluminous porcelain formulations containing up to 30 wt.% of TV tube glass waste as a replacement for traditional flux material (sodium feldspar) were pressed and fired in air at 1300 ºC using a fast-firing cycle (< 60 min). X-ray diffraction (XRD), scanning electron microscopy (SEM), linear shrinkage, apparent density, water absorption, and electrical resistivity have been carried out. The results indicated that the aluminous porcelain pieces containing up to 30 wt.% of TV tube glass waste rich in PbO with water absorption between 0.42 and 0.45% and volume electrical resistivity between 1.91 and 2.93 x 10 11 Ω.cm have high potential to work as electrical insulator material. This use of lead containing TV tube glass waste can contribute greatly to reducing the environmental impacts related to it, and also save the sources of non-renewable raw materials used in the electrical porcelain sector.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Incorporation of Lead Containing TV Tube Glass Waste in Aluminous Porcelain

2017

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“…Also, this residue may cause serious human health problems, such as silicosis. Currently, the granite waste is mainly used in civil construction to produce materials in the form of mortar, bricks and tiles 11,12 . However, new applications for this waste are necessary due to the high produced volumes and the average growth of world production estimated at 6% per year 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Recovery of Steelmaking Slag and Granite Waste in the Production of Rock Wool

Alves¹,

Espinosa

Tenório

2015

Mat. Res.

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Steelmaking slag and residues from granite cuttings are industrial wastes with considerable production, however limited applications. This work studied an inertization and recovery process of such wastes as raw materials into production of rock wool (i.e. a thermo-acoustic insulator with growing market). Several batches were produced aiming the chemical proprieties of a currently marketed rock wool. Mixtures were casted at temperatures of 1400-1500 °C, then quenched in water and also poured into a Herty Viscosimeter. Produced materials with thickness smaller than 500µm were characterized by chemical analyses, XRD, SEM, EDS and DTA. ThermoCalc software was used to simulate the cooling curves of rock wools. Results showed that incorporation of wastes does not affect the main qualities of rock wool, the thermal insulation and prevention of fire spread. Raw material batches of rock wools may assimilate up to 66% of granite waste, or 53% steelmaking slag, or 70% combining both materials.

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“…In Brazil, in 2007, approximately 1.8 million tons of wastes was generated by this sector (Silva et al 2011). In this step, the waste is composed of water, lime, steel shot and rock particles.…”

Section: Introductionmentioning

confidence: 99%

“…After drying, this residue becomes dust, and it is classified as hazardous waste because of the amount of soluble iron. Generally, it is deposited in outdoor piles or in rivers, without any type of treatment (Silva et al 2011;Binicia et al 2008). The presence of iron in the granite waste is a consequence of the cutting process, where steel shots, a source of iron, are frequently added during this stage.…”

Section: Introductionmentioning

confidence: 99%

Iron recovery from the waste generated during the cutting of granite

Junca

Oliveira

Espinosa

et al. 2013

Int. J. Environ. Sci. Technol.

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Metallic iron is present in the waste left when granite blocks are cut. Thus, the purpose of this study was to characterize this waste using chemical and particle size analyses. To achieve this, X-ray diffraction and scanning electron microscopy coupled with electron back-scattered diffraction were used. To find the method with the best metallic iron recovery from the waste of ornamental rock, three distinct methods were examined: magnetic separation, table concentration and cyclone processing. The first method involved three steps: (1) use of a wet high-intensity magnetic separator, where only the equipment's remaining magnetic field was present; (2) the material from the first step was then submitted to separation again, this time using a magnet for rare earth particles; and (3) this material after two separation processes was finally submitted to ferromagnetic separation. The second method used a concentration table set at various inclinations, oscillation frequencies and wash flow rates. Meanwhile, for the third method, the cyclone tests, only the water pressure was varied. After each test, a chemical analysis was performed to determine the metallic iron present in each sample. The tests revealed that magnetic separation presents the best results. Using this technique, a ferrous concentrate with 93 % metallic iron content and a granite concentrate with only 0.6 % metallic iron were obtained. On the other hand, in the table concentrator tests, the ferrous concentrate only had a metallic concentration of 13.6 %. In separation by the cyclone processing, the product barely contained metallic iron (7.2 % maximum).

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Reuse of ornamental rock-cutting waste in aluminous porcelain

Cited by 19 publications

References 23 publications

Incorporation of Lead Containing TV Tube Glass Waste in Aluminous Porcelain

Incorporation of Lead Containing TV Tube Glass Waste in Aluminous Porcelain

Recovery of Steelmaking Slag and Granite Waste in the Production of Rock Wool

Iron recovery from the waste generated during the cutting of granite

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