Waste-bearing decorative glazes for facade ceramics

Abstract

Glaze compositions are obtained based on slime from acid sewage regeneration at the Dyat'kovskii Crystal Works, and the technology of producing tinted glass ceramic coatings for facade brick is developed. The main physicotechnical and color characteristics of considered glazes are presented.Contemporary construction industry has a wide range of strong wear-resistant and durable facade ceramic products for public and residential buildings. However, in a market economy when supply exceeds demand a consumer gives preference to materials that combine diverse structural-texture specifics and coating colors. Such decorative properties can be achieved by varying the heat treatment procedure and the redox condition of synthesis and firing [1], as well as by using the controlled crystallization method involving titanium-bearing components [2]. At the same time, several other urgent problems can be solved: utilization of constantly accumulating industrial waste that is toxic for the ambient medium, expansion of the list of available materials for the glass industry, and assisting the commercial activity of companies.The purpose of the present study is to develop decorative glass coatings for facade ceramics based on a frit containing a resource-saving component, namely, slime of acid sewage regeneration from the Dyat'kovskii Crystal Works.For the synthesis of glass coatings we chose the system SiO 2 -Al 2 O 3 -B 2 O 3 -Na 2 O, which is one of the main systems for producing white enamels and(or) glazes with different degrees of opacification and luster. Considering a substantial glass-formation area in the specified system [3], the weight contents of SiO 2 , Al 2 O 3 , B 2 O 3 , and Na 2 O were constantly maintained at 50.0, 3.0, 9.5, and 15.5%, respectively, while varying the RO : TiO 2 ratio, which is the deciding factor in the formation of dull and(or) transparent coatings ( Table 1).The initial materials for melting glazes were quartz sand VS-030 (GOST 22551-77), alumina, boric acid, soda, titanium white, and acid sewage regeneration slime from the Dyat'kovskii Crystal Works. Slip was prepared using bentonite clay, technical borax, and color pigments 16/4744, 10/185, 12/350, 11/201, 18/995, and CuCl 2 produced by Intercolor (Italy).Glasses were melted in a laboratory electric furnace in alundum crucibles of capacity 100 cm 3 at a temperature of 1300°C exposing the melt for 30 min at the maximum temperature. Melted glass was granulated in water.Slip was prepared by moist grinding of components in a ball mill to a residue of 0.1% on a No. 0063 sieve. To produce glass coatings, a slip of moisture 53 -68%, density 1480 -1730 kg/m 3 , and flow rate of 14 -18 sec from a viscosimeter of diameter 4 mm was deposited on the facade surface of a ceramic substrate (red facade brick) by casting. Coatings were dried at 120 ± 5°C, firing was performed in a SNOL-1 electric laboratory furnace in a temperature interval of 900 -1150°C for 15 min.All coatings had good strength of adhesion to the substrate. At the same time the quality, colo...

Lustrous wrappings: Complex color and collaborative practices in the contemporary ceramic facade

“…25 The library of glaze tests was originally commissioned by Aberdeen Art Gallery in Scotland in 2017, with a subsequent web resource that displays the experiments alongside the glaze recipes. Research in waste product recycling confirms the potential for incorporating reclaimed materials and industrial waste in the production of glazes 26 . Nevin Yalçın and Vahdettin Sevinç report on the successful production of glazes from bauxite waste materials.…”

“…Research in waste product recycling confirms the potential for incorporating reclaimed materials and industrial waste in the production of glazes. 26 Nevin Yalçın and Vahdettin Sevinç report on the successful production of glazes from bauxite waste materials. In the making of aluminum, approximately 35%-40% of processed bauxite goes to waste as red mud and has serious issues for long term storage and environment.…”