Constituents and Properties of Ammoniated Slurry From Wet-process Phosphoric Acid
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概要
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A large amount of gel-like substance is formed during the ammoniation of wet-process phosphoric acid and affects the production of phosphate fertilizers. The authors have found that the main constituent of the gel-like substance is a compound "S" whose composition has been determined to be (Al,Fe)NH<SUB>4</SUB>HF<SUB>2</SUB>PO<SUB>4</SUB>. Several other compounds, Fe<SUB>3</SUB>NH<SUB>4</SUB>H<SUB>8</SUB>(PO<SUB>4</SUB>)<SUB>6</SUB>·6H<SUB>2</SUB>O, (Fe,Al)NH<SUB>4</SUB>H<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>·1/2H<SUB>2</SUB>O, Fe(NH<SUB>4</SUB>)<SUB>2</SUB>H<SUB>2</SUB>F(PO<SUB>4</SUB>)<SUB>2</SUB>·<I>x</I>H<SUB>2</SUB>O, (NH<SUB>4</SUB>)<SUB>3</SUB>AlF<SUB>6</SUB>, gelatinous silica, <I>etc.</I>, are also formed during the ammoniation and curing of the ammoniated slurry, depending upon pH, atomic ratio of F/(Al+Fe) and temperature. Tests also were made on the properties of the ammoniated slurry; solubility, viscosity, filterability, and the rate of sedimentation. It has been found that the properties vary with the formation of the above compounds. A high-temperature modification of (NH<SUB>4</SUB>)<SUB>2</SUB>HPO<SUB>4</SUB> which is stable above 155°C has been newly found during the tests.
- 公益社団法人 日本化学会の論文
著者
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Akiyama Takashi
Faculty of Science and Engineering, Chuo University
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Ando Jumpei
Faculty of Science and Engineering, Chuo University