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Impact of Higher Temperature on Quartz Moulding Sand with Gypsum Binders

Paduchowicz P., Stachowicz M., Granat K.

Archives of Foundry Engineering

2018

Vol. 18, iss. 1

81--86

This paper presents initial findings from research into the possibility of using gypsum binders in quartz moulding sand that could be used in the production of casting moulds and cores. For the purposes of the research two commercial types of gypsum were used as binders: building gypsum and gypsum putty. Dry components of moulding sand i.e. medium quartz sand and gypsum were mixed in proportion of 89/11 parts by weight. In order to achieve bonding properties for the binders, 5 parts by weight of water was added to the mixture of dry components. After 24 hours of adding water and mixing all the components, the moulding sand, naturally hardened, was subjected to high temperature. The moulding sand thus produced, i.e. with cheap and environmentally-friendly gypsum binders, was eventually analysed after heating (at temperatures of 300oC, 650oC and 950oC) and cooling in order to determine changes in the following parameters: LOI – loss on ignition, chemical composition and pH. Moreover, investigated were bonding bridges, before and after the moulding sand was roasted. The research results revealed differences in the structure of bonding bridges and the occurrence of automatic adhesive destruction for both types of gypsum binders. For two types of moulding sands under the investigation of the LOI exceeded 2.59wt.% (with building gypsum) or 2.84wt.% (with putty gypsum) and pH increased to ca. 12 as a result of increasing roasting temperature from 300oC to 650oC. Next, roasting at 950oC decrease value of LOI in both types of moulding sands. Moulding sand with builoding gypsum roasted at 950oC revealed a return to the value of pH parameter measured prior to annealing.

Gładzie na bazie spoiwa gipsowego

Hynowski M., Czernik S.

Materiały Budowlane

2016

nr 10

10--11

Technologia wykonywania gładzi gipsowych

Czernik S.

Izolacje

2013

R. 18, nr 11-12

46--48

W artykule omówiono rodzaje dostępnych na rynku tynków wewnętrznych z uwzględnieniem wyrobów przeznaczonych do uzyskania gładkiej powierzchni – gładzi gipsowych. Opisano sposób przygotowania podłoża oraz zaczynu gipsowego. Przedstawiono szczegóły różnych metod aplikacji oraz sposoby oceny jakości wykonanej gładzi.

The article discusses the available in the market types of plaster for use in interiors taking into account the products designed to achieve a smooth surface – gypsum plaster. The method of surface and gypsum slurry preparation is described. Details of various application methods and ways to assess the quality of plaster were presented.