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Effects of some extracted oxides on silica fume waste for mullite preparation: Physical, mechanical, optical, magnetic, and dielectric properties
In this study, Ceramic pigments on the base waste silica-containing material were obtained. Extracted corundum from alum sludge is mixed with silica fume to prepare mullite. The ions of iron, in the form of hematite (α-Fe2O3), magnetite (Fe3O4), and maghemite (γ-Fe2O3), which were extracted from alu...
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Published in: | Materials chemistry and physics 2022-04, Vol.281, p.125880, Article 125880 |
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description | In this study, Ceramic pigments on the base waste silica-containing material were obtained. Extracted corundum from alum sludge is mixed with silica fume to prepare mullite. The ions of iron, in the form of hematite (α-Fe2O3), magnetite (Fe3O4), and maghemite (γ-Fe2O3), which were extracted from alum sludge are embedded, from 2 to 15 wt%, in the prepared mixtures. The samples are sintered at 1300, 1400, 1500, and 1550 °C to follow the phase compositions. The phase composition, microstructure, physical properties, mechanical properties, magnetic properties, and dielectric properties as well as UV–visible reflectance spectra are determined for the sintered samples. A decrease in apparent porosities (The minimum apparent porosity is about 2%) and an increase in the bulk density (maximum bulk density reaches 2.77 g/cm3) are observed with increasing iron ions and sintering. The strength of the resulting samples increases with an increase in iron ions that enhance the in situ mullite formations, which act as the reinforcement agent of the matrix and form enough liquid phase at 1550 °C. The compressive strength becomes 278 MPa for samples containing high iron ions. Thus, the liquid phase helps in holding a crystalline mass together. The highest saturation magnetization is 2.26 emu/g after sintering at 1500 °C, obtained for the sample containing high amount of iron ions. The presence of high amount of iron oxide enhances the formation of the glassy phase that facilitates the mobile ions to find an easy path to move, thus, increasing the dielectric constant to 16. The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes for building materials.
•This work is succeeded in preparing pigment-mullite materials based on extracted alumina and iron oxide of alum sludge.•A decrease in apparent porosities and an increase in the bulk density are observed with increasing iron contents.•Dielectric constant and compressive strength increased for samples containing high iron ions.•The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes. |
doi_str_mv | 10.1016/j.matchemphys.2022.125880 |
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•This work is succeeded in preparing pigment-mullite materials based on extracted alumina and iron oxide of alum sludge.•A decrease in apparent porosities and an increase in the bulk density are observed with increasing iron contents.•Dielectric constant and compressive strength increased for samples containing high iron ions.•The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes.</description><identifier>ISSN: 0254-0584</identifier><identifier>EISSN: 1879-3312</identifier><identifier>DOI: 10.1016/j.matchemphys.2022.125880</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Alum sludge ; Alumina ; Building materials ; Bulk density ; Compressive strength ; Construction materials ; Corundum ; Dielectric properties ; Ferric oxide ; Glazes ; Hematite ; Iron oxides ; Liquid phases ; Maghemite ; Magnetic properties ; Magnetic saturation ; Mechanical properties ; Mullite ; Optical properties ; Phase composition ; Physical properties ; Pigments ; Silica fume ; Sintering (powder metallurgy) ; Sludge</subject><ispartof>Materials chemistry and physics, 2022-04, Vol.281, p.125880, Article 125880</ispartof><rights>2022 Elsevier B.V.</rights><rights>Copyright Elsevier BV Apr 1, 2022</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c349t-159f8425dcb93285a4f5dfb393b25856eec3a3521cf48915252768afe518dd313</citedby><cites>FETCH-LOGICAL-c349t-159f8425dcb93285a4f5dfb393b25856eec3a3521cf48915252768afe518dd313</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Khattab, R.M.</creatorcontrib><creatorcontrib>Abo-Almaged, H.H.</creatorcontrib><creatorcontrib>Sadek, H.E.H.</creatorcontrib><title>Effects of some extracted oxides on silica fume waste for mullite preparation: Physical, mechanical, optical, magnetic, and dielectric properties</title><title>Materials chemistry and physics</title><description>In this study, Ceramic pigments on the base waste silica-containing material were obtained. Extracted corundum from alum sludge is mixed with silica fume to prepare mullite. The ions of iron, in the form of hematite (α-Fe2O3), magnetite (Fe3O4), and maghemite (γ-Fe2O3), which were extracted from alum sludge are embedded, from 2 to 15 wt%, in the prepared mixtures. The samples are sintered at 1300, 1400, 1500, and 1550 °C to follow the phase compositions. The phase composition, microstructure, physical properties, mechanical properties, magnetic properties, and dielectric properties as well as UV–visible reflectance spectra are determined for the sintered samples. A decrease in apparent porosities (The minimum apparent porosity is about 2%) and an increase in the bulk density (maximum bulk density reaches 2.77 g/cm3) are observed with increasing iron ions and sintering. The strength of the resulting samples increases with an increase in iron ions that enhance the in situ mullite formations, which act as the reinforcement agent of the matrix and form enough liquid phase at 1550 °C. The compressive strength becomes 278 MPa for samples containing high iron ions. Thus, the liquid phase helps in holding a crystalline mass together. The highest saturation magnetization is 2.26 emu/g after sintering at 1500 °C, obtained for the sample containing high amount of iron ions. The presence of high amount of iron oxide enhances the formation of the glassy phase that facilitates the mobile ions to find an easy path to move, thus, increasing the dielectric constant to 16. The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes for building materials.
•This work is succeeded in preparing pigment-mullite materials based on extracted alumina and iron oxide of alum sludge.•A decrease in apparent porosities and an increase in the bulk density are observed with increasing iron contents.•Dielectric constant and compressive strength increased for samples containing high iron ions.•The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes.</description><subject>Alum sludge</subject><subject>Alumina</subject><subject>Building materials</subject><subject>Bulk density</subject><subject>Compressive strength</subject><subject>Construction materials</subject><subject>Corundum</subject><subject>Dielectric properties</subject><subject>Ferric oxide</subject><subject>Glazes</subject><subject>Hematite</subject><subject>Iron oxides</subject><subject>Liquid phases</subject><subject>Maghemite</subject><subject>Magnetic properties</subject><subject>Magnetic saturation</subject><subject>Mechanical properties</subject><subject>Mullite</subject><subject>Optical properties</subject><subject>Phase composition</subject><subject>Physical properties</subject><subject>Pigments</subject><subject>Silica fume</subject><subject>Sintering (powder metallurgy)</subject><subject>Sludge</subject><issn>0254-0584</issn><issn>1879-3312</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNqNUc1uGyEYRFUjxU3yDlS9Zh1-ljXbW2Q5P5Kl5JCcEYaPGmt32QJO7cfIGwdrc-gxJ0Z8880wDEI_KZlTQpub3bzX2WyhH7fHNGeEsTllQkryDc2oXLQV55R9RzPCRF0RIetz9COlHSF0QSmfofeVc2BywsHhFHrAcMhRmwwWh4O3UAYDTr7zRmO3L_N_OmXALkTc77vOFzxGGHXU2YfhN34uzyjc7hr3YLZ6mHAY8-el_jNAwddYDxZbD10xj94UkTBCzB7SJTpzuktw9XleoNe71cvyoVo_3T8ub9eV4XWbKypaJ2smrNm0nEmhayes2_CWb0p-0QAYrrlg1LhatlQwwRaN1A4EldZyyi_Qr0m3WP_dQ8pqF_ZxKJaKNU35ScraE6udWCaGlCI4NUbf63hUlKhTA2qn_mtAnRpQUwNldzntQonx5iGqZDwMBqyPJbaywX9B5QO5-pd4</recordid><startdate>20220401</startdate><enddate>20220401</enddate><creator>Khattab, R.M.</creator><creator>Abo-Almaged, H.H.</creator><creator>Sadek, H.E.H.</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20220401</creationdate><title>Effects of some extracted oxides on silica fume waste for mullite preparation: Physical, mechanical, optical, magnetic, and dielectric properties</title><author>Khattab, R.M. ; Abo-Almaged, H.H. ; Sadek, H.E.H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c349t-159f8425dcb93285a4f5dfb393b25856eec3a3521cf48915252768afe518dd313</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Alum sludge</topic><topic>Alumina</topic><topic>Building materials</topic><topic>Bulk density</topic><topic>Compressive strength</topic><topic>Construction materials</topic><topic>Corundum</topic><topic>Dielectric properties</topic><topic>Ferric oxide</topic><topic>Glazes</topic><topic>Hematite</topic><topic>Iron oxides</topic><topic>Liquid phases</topic><topic>Maghemite</topic><topic>Magnetic properties</topic><topic>Magnetic saturation</topic><topic>Mechanical properties</topic><topic>Mullite</topic><topic>Optical properties</topic><topic>Phase composition</topic><topic>Physical properties</topic><topic>Pigments</topic><topic>Silica fume</topic><topic>Sintering (powder metallurgy)</topic><topic>Sludge</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Khattab, R.M.</creatorcontrib><creatorcontrib>Abo-Almaged, H.H.</creatorcontrib><creatorcontrib>Sadek, H.E.H.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Materials chemistry and physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Khattab, R.M.</au><au>Abo-Almaged, H.H.</au><au>Sadek, H.E.H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of some extracted oxides on silica fume waste for mullite preparation: Physical, mechanical, optical, magnetic, and dielectric properties</atitle><jtitle>Materials chemistry and physics</jtitle><date>2022-04-01</date><risdate>2022</risdate><volume>281</volume><spage>125880</spage><pages>125880-</pages><artnum>125880</artnum><issn>0254-0584</issn><eissn>1879-3312</eissn><abstract>In this study, Ceramic pigments on the base waste silica-containing material were obtained. Extracted corundum from alum sludge is mixed with silica fume to prepare mullite. The ions of iron, in the form of hematite (α-Fe2O3), magnetite (Fe3O4), and maghemite (γ-Fe2O3), which were extracted from alum sludge are embedded, from 2 to 15 wt%, in the prepared mixtures. The samples are sintered at 1300, 1400, 1500, and 1550 °C to follow the phase compositions. The phase composition, microstructure, physical properties, mechanical properties, magnetic properties, and dielectric properties as well as UV–visible reflectance spectra are determined for the sintered samples. A decrease in apparent porosities (The minimum apparent porosity is about 2%) and an increase in the bulk density (maximum bulk density reaches 2.77 g/cm3) are observed with increasing iron ions and sintering. The strength of the resulting samples increases with an increase in iron ions that enhance the in situ mullite formations, which act as the reinforcement agent of the matrix and form enough liquid phase at 1550 °C. The compressive strength becomes 278 MPa for samples containing high iron ions. Thus, the liquid phase helps in holding a crystalline mass together. The highest saturation magnetization is 2.26 emu/g after sintering at 1500 °C, obtained for the sample containing high amount of iron ions. The presence of high amount of iron oxide enhances the formation of the glassy phase that facilitates the mobile ions to find an easy path to move, thus, increasing the dielectric constant to 16. The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes for building materials.
•This work is succeeded in preparing pigment-mullite materials based on extracted alumina and iron oxide of alum sludge.•A decrease in apparent porosities and an increase in the bulk density are observed with increasing iron contents.•Dielectric constant and compressive strength increased for samples containing high iron ions.•The pale browns to dark brown pigments are obtained to be recommended for ceramic paints and colored glazes.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.matchemphys.2022.125880</doi></addata></record> |
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subjects | Alum sludge Alumina Building materials Bulk density Compressive strength Construction materials Corundum Dielectric properties Ferric oxide Glazes Hematite Iron oxides Liquid phases Maghemite Magnetic properties Magnetic saturation Mechanical properties Mullite Optical properties Phase composition Physical properties Pigments Silica fume Sintering (powder metallurgy) Sludge |
title | Effects of some extracted oxides on silica fume waste for mullite preparation: Physical, mechanical, optical, magnetic, and dielectric properties |
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