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- W2134859097 abstract "Reports have indicated that calcined topaz might be useful as substitute material for Indian kyanite in high aluminous, mullite-type refractories. Tests were conducted to determine the value of calcining and defluorinating raw topaz. Fifteen tons of minus 1-in. topaz ore were calcined in a 25-ft. rotary kiln of 20-in. in inside diameter, at 2600° to 2950°C., with feed rate of 200 to 400 1b. per hour and feed retention in the kiln of 70 to 120 minutes. The best operating conditions were found to be 2700°F. and a feed rate of 300 1b. per hour at 0.90 r.p.m. of kiln rotation. The average fluorine content was 0.24% and the apparent porosity was 19%. A dust loss of 11% occurred during calcination, but no serious reduction in particle size occurred from the heat-treatment. It seems to be practicable, therefore, to calcine and defluorinate raw topaz in a rotary kiln and to obtain a product suitable for the manufacture of mullite-type refractories." @default.
- W2134859097 created "2016-06-24" @default.
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- W2134859097 date "1944-06-01" @default.
- W2134859097 modified "2023-09-25" @default.
- W2134859097 title "CALCINATION OF TOPAZ ORE IN A ROTARY KILN*" @default.
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- W2134859097 doi "https://doi.org/10.1111/j.1151-2916.1944.tb14888.x" @default.
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