Reference

Standard enthalpy of formation of crystalline Mohr's salt

Standard enthalpy of formation of crystalline Mohr's salt. Vasil'ev, V. P.; Vasil'eva, V. N.; Dmitrieva, N. G. (Ivanov. Khim.-Tekhnol. Inst., Ivanovo, USSR). Zh. Neorg. Khim., 23(5), 1278-84 (Russian) 1978. CODEN: ZNOKAQ. ISSN: 0044-457X. DOCUMENT TYPE: Journal CA Section: 69 (Thermodynamics, Thermochemistry, and Thermal Properties) The std. enthalpy of formation was calcd. of cryst. Mohr's salt [10045-89-3] from the exptl. heat of soln. in HClO4 aq. solns. contg. H2O2. The value is DHf0 (298.15) = -93,746 kcal/mol.

Recovery of valuable components in ferrous ammonium sulfate

Recovery of valuable components in ferrous ammonium sulfate. Mori, Tadaaki; Tenma, Satoru; Kawakami, Noboru (Toyo Soda Mfg. Co., Ltd., Japan). Japan. Kokai JP 51141798 6 Dec 1976 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C01C001-24. APPLICATION: JP 75-64846 31 May 1975. DOCUMENT TYPE: Patent CA Section: 54 (Extractive Metallurgy) Fe(NH4)2(SO4)2 [10045-89-3] contg. heavy metal(s) is dissolved in water, treated with alkali to ppt. Cr compds., filtered, treated with O-contg. gas to oxidize Fe, and extd. with an org. solvent. The ext., contg. Fe oxide, is reextd. to recover Fe, and the resulting raffinate is again extd. with an org. solvent to sep. other heavy metals and recover (NH4)2SO4 (I). Thus, Fe(NH4)2(SO4)2, by-product from electrolysis of ferrochromium for Cr manuf., was dissolved in water, and the resulting soln. (pH 1) contg. Cr3+ 0.075, Mn2+ 0.041, Ni 0.029, and Fe(NH4)2(SO4)2.6H2O 210 g/L was mixed with NH4OH to pH 3, filtered to remove pptd. (Cr(OH)3, aerated in a packed tower while adding NH4OH into the soln. for oxidn. of Fe, and extd. with bis(2-ethylhexyl) phosphate-kerosine soln. (II). The ext. was reextd. with 10N H2SO4 to obtain a Fe2(SO4)3 soln. contg. 22.30 g Fe/L. The raffinate was extd. with II to sep. Ni2+ and Mn2+, and the ext. was reextd. with 5% H2SO4 to obtain a I soln., which was concd. to give 55 g I.