Nests free lime

Ono (1995) characterized the alite in raw (poorly) burned clinker in relation to the occurrence of the alite (1) next to free lime and (2) next to a belite nest. Where alite is next to a free lime cluster, the alite is small, isolated and dispersed, separated from free lime, con tains a large amount of melt, is strongly etched, and is heterogeneous and zoned. Alite next to a belite nest is relatively large, connected and welded, touching the belite, contains a small amount of melt, is weakly etched, and is homogeneous and flat (not zoned). [Pg.47]

Ono (1991) listed some of the characteristics of poorly burned clinker free lime greater than 4.5%, tightly packed large free lime nests, belite nests with a surrounding of small alites, high porosity, a loose framework of free lime and alkali aluminate, and a flow pattern of matrix into the free-lime nest. Well-burned clinker was said to contain small free lime and octahedral periclase from dolomite and coarse aluminate and ferrite, resulting from equilibrium crystallization. [Pg.54]

Coarsely crystalline alite surrounded by finer-grained alite and free lime Coarse quartz and locally high lime saturation factor converting previous beiite nest to alite (Miller, 1980)... [Pg.75]

Free-lime nests Local concentration of limestone (Tsuboi and Ogawa, 1972)... [Pg.109]

Free-lime nests Relics of limestone grains (Kramer, 1960) calcite above critical size of 125 pm (Johansen, 1978) coarse calcite (Long, 1984b)... [Pg.109]

Free-lime nests and belite nests Quartz above critical size of 44 pm in feed (Johansen, 1978)... [Pg.109]

Free-lime nests near belite accumulations or many small pores Low burning degree (Gille and others, 1965)... [Pg.109]

Hoop-stress cracks around free lime nests Expansion due to lime hydration, typical for aged clinker (Brugan, 1979)... [Pg.110]

Photograph 7-79 Free-lime nest colored by water etch in polished section. Chemical analysis gave clinker free-lime value of 2.69%. High maximum temperature, moderately long burning time, moderately slow heating rate, moderately slowly cooled, 31 MPa. Gas-fired, dry-process kiln, 3000 tons/day. (S A6697)... [Pg.110]

Photograph 7-81 Free-lime nest from coarse calcite particle in raw feed. Very low liquid phase. Coal- and coke-fired, dry-process kiln. Moderately high maximum temperature, long burning time, moderately fast heating rate, quick cooling rate. (S A6699)... [Pg.111]

Photograph 7-82 Free lime in clinker thin section. Crystals exhibit prominent cubic cleavage characteristic of free lime. An abundance of free-lime nests (some showing original limestone particle outline), anhedral alite, and extremely nonuniform distribution of silicates suggests poorly mixed coarse feed. Dry-process kiln, coal fired. (S A6700)... [Pg.111]

Periclase nest with free lime Coarse dolomitic limestone (Long, 1982a)... [Pg.113]

Open cluster of periclase plus free lime nest with interstitial periclase Large dolomite, depending on local surrounding chemistry (Fundal. 1980)... [Pg.113]

Photograph 8-3 Etch halo around free lime nest observed after NH CI etch ( H in text, Chapter 3). The halo may be the result of etch interference by liquid exuding from the porous free lime crystals and nearby pores. (S A6719)... [Pg.122]

Cauliflowerlike calcium hydroxide crystals (presumably epezite), from hydration of free lime (air slaking), and round, gray periclase crystals in a nest, suggesting coarse dolomite in the feed. (S A6744)... [Pg.135]

Dreizler and Schafer (1990) also stated that the concentration of less active quartz in the coarse fraction of the raw material decreases sinterability, increases energy requirements or free lime, and increases development of belite nests. A chemical method of evaluating the burnability of various particle-size fractions of the feed, involving the calculation of the "weighted mean of the lime saturation standard," along with microscopy of the feeds, was said to be a very cost-effective tool in control of energy consumption and cement quality. For this study, six raw feed size fractions, from <32 to >200 pm, were investigated. [Pg.142]

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