![]() ![]() Feldspar rocks may be successfully replaced by LCD waste glass. The densification of green body, cleanability and the stain resistance of polished sintered ceramic tiles is influenced by particle size distribution of used feldspar rocks. Suitable choice of feldspar rock can significantly affect the properties of the ceramic body, firing temperature and soaking time. Feldspar rocks are usually used as a source of alkali oxides (Na 2O, K 2O) and alumina (Al 2O 3)for the preparation of glazes. The plagioclase series follows according to percentage of anorthite in parentheses. Solid solutions between K‐feldspar and albite are called alkali feldspars, and solid solutions between albite and anorthite are plagioclase feldspars. Pure feldspars are divided into potassium feldspars (orthoclase, microcline), sodium feldspars (albite) and calcium feldspars (anorthite). Feldspar rocks are a mixture of pure feldspars, quartz and mica especially from the mineralogical point of view. įeldspar rocks are used in the fine ceramic industry as a fluxing agent to form a glassy phase for accelerating of sintering process. Typical properties of porcelain body are low porosity (below 0.3%), high mechanical strength (bending strength over 40 MPa, Young Modulus over 60 GPa), firing temperature about 1300☌ and high whiteness and translucency. Traditional raw material mixture for whiteware (porcelain) production covers kaolin or/and kaolin clay, quartz and feldspar rock at a composition about 50:25:25 wt.%. Whiteware is a traditional ceramic material used to make pottery and porcelain. ![]()
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