The effects of additions of urea, monobasic ammonium phosphate, dibasic ammonium phosphate, sodium ammonium phosphate, ammonium nitrate, and ammonium chloride on some physical properties of an unfired and a fired illitic shale of high carbonate content were studied. X-ray examination of the Devonian shale showed that illite was the predominant clay mineral; there was also some chlorite. Scum was reduced and a clean surface was produced by additions of ½ to 1% of ammonium phosphate. Urea did not reduce scum. Ammonium nitrate and ammonium chloride increased scum. Fired absorption was increased by monobasic ammonium phosphate, ammonium chloride, and ammonium nitrate, whereas dibasic ammonium phosphate, sodium ammonium phosphate, and urea produced only slight changes. The workability of the tempered shale was decreased by 1% additions of monobasic ammonium phosphate, ammonium chloride, and ammonium nitrate. The presence of the chloride or the nitrate ions caused thixotropy and the p

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physical properties tempered shale thixotropy devonian fired nitrate scum

M. P. BAULEKE C. M. DODD,.Effect of Ammonium Salts on an Illitic Shale. 40 (10),325-334.

M. P. BAULEKE C. M. DODD,"Effect of Ammonium Salts on an Illitic Shale" 40

M. P. BAULEKE C. M. DODD,"Effect of Ammonium Salts on an Illitic Shale"