Nests belite

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]

Yellow nested belite Coarse quartz, lack of lime diffusion into nest (Dorn, 1985)... [Pg.87]

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]

Large belite nests were shown to be indicative of poor grindability, even though the same clinker may have relatively high porosity. Clusters of belite crystals remained undivided even at the final grinding stage. [Pg.54]

Colorless belite, according to Lee (1983), can occur as very small inclusions in alite and contains very little impurity. Large-crystal, ringlike belite nests (from coarse alkali feldspar) are also colorless because of iron-oxide deficiency. These occurrences of belite, therefore, do not reflect the cooling rate. Consequently, Ono (1978) recommends color observation of roughly 20 pm belite crystals in order to judge the cooling rate. [Pg.60]

Belite nest with dense, thick layer of alite with very porous outermost zones Typical in dust formation (Fundal, 1980)... [Pg.66]

Photograph 7-7 Variation in alite crystal sizes clusters of small crystals (14 pm), noncluster crystals (38 pm). Round belite crystals in nest in upper center. High maximum temperature, long burning time, moderately slow heating rate, quickly cooled, 42 MPa. Gas-fired, dry-process kiln, 770 tons/day. (S A6627)... [Pg.70]

Large densely packed alite crystals Derived from large belite in nests from coarse silica (Long, 1983)... [Pg.74]

Alite more than 20 pm and dense belite nest Numerous quartz grains greater than 100 pm (Tsuboi and Ogawa, 1972)... [Pg.74]

Zones in alite broaden toward nearby belite nests Calcium and silica abundant in nest area (Ono, Kawamura, and Soda, 1968)... [Pg.77]

Belite nests Ash shortage, excessive quartz grain size, presence of feldspar and blastfurnace slag (Gille and others, 1965)... [Pg.83]

Nests of belite Vestigal quartz grain (Kramer, 1960)... [Pg.83]

Pore-oentered belite nests with relatively large, densely paoked crystals, producing large alite at higher temperature if lime is available Coarse quartz in feed (Long, 1982a)... [Pg.83]

Large patches of belite belite nests from coarse quartz Selective reaction of raw mix components clay at lower temperature than that for quartz, muscovite, hornblende, and Ca-feldspars resulting in early nodulation (micronodules) and clinker dust with high lime saturation factor (Fundal, 1980)... [Pg.83]

Belite nests with curved boundaries and very little liquid phase Concentration of siliceous component (lack of lime) (Hofmanner, 1973)... [Pg.83]

Belite nests (loosely packed) with aluminate-rich melt Coarse aluminosilicate grain, perhaps a feldspar (Miller, 1980)... [Pg.84]

Decrease in belite nests Increase in amount of clay or shale in mix (Frederick, 1985)... [Pg.84]

Photograph 7-25 Experimental laboratory burn with raw mix containing marl instead of quartz as a silica source. Resulting belite was well scattered in clinker and, to a minor extent, as nests. 1000°C for 30 min, 1425°C for 10 min. Very rapid temperature change. Average alite size = 20 pm. Clinker courtesy of Joe Garcia, Capitol Cement, San Antonio, Texas. (S A6645)... [Pg.88]

Photograph 7-34 Belite crystals comprising sharply delineated nest around pore (black), probably the site of a coarse quartz grain in the feed. Coal- and coke-fired, dry-process kiln. (S A6654)... [Pg.91]

Photograph 7-37 Bimodal belite in laboratory-burned clinker made from a raw feed containing coarse quartz sand. Large nest of tightly packed belite crystals and much smaller crystals showing wide lamellae. Note gradational color response in nital etch of nest. 55% of the alite crystals were said to be greater than 75 pm. [Pg.92]

Photograph 7-61 Green belite nest in center of broken clinker. Energy dispersive X-ray analysis (EDXA) indicates calcium, silicon, potassium, and traces of chromium, magnesium, aluminum, sulfur, chlorine, and iron. (S A6681)... [Pg.100]

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

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