The system NiSO4—CaSO4—H2O

Campbell, A. N.; Yanick, Nicholas S.

doi:10.1039/tf9322800657

Cited by 11 publications

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“…However, at higher concentrations his solubility is much too high. This is due to the method of calcium analysis used by Campbell et al 16 4 Harkins et al, 6 and Mutalala et al 17 are in good agreement with one another (Figure 10).…”

Section: Resultssupporting

confidence: 62%

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Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Wollmann

Voigt

2008

J. Chem. Eng. Data

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The search for literature data in the ternary systems M 2+ , Ca 2+ + SO 4 2-+ H 2 O (M ) Mg, Mn, Co, Ni, Cu, Zn) revealed a lack of data. A reason might be the difficulties of Ca analysis at high concentrated bivalent metal solutions. The solubility of gypsum was determined in MSO 4 solutions (M ) Mg, Mn, Co, Ni, Cu, Zn) over a broad concentration range at T ) 298.15 K and T ) 313.15 K. With increasing magnesium and heavy metal sulfate, respectively, the gypsum solubility decreases to a minimum and rises afterward to a maximum at about 1.2 mol MSO 4 /kg. Above that concentration, the solubility of gypsum decreases again until saturation with MSO 4 . At both temperatures and in the whole concentration range, no double salt formation was noticed. With increasing temperature, the solubility of gypsum increases also.

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Section: Resultssupporting

confidence: 62%

“…Molal solubility m of gypsum in nickel sulfate solution at T ) 313.15 K. Filled square, this study; triangle, Campbell et al16 at T ) 318.15 K; half-filled symbol, invariant point. Vertical lines indicate uncertainty at 95 % confidence limit.…”

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confidence: 97%

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Wollmann

Voigt

2008

J. Chem. Eng. Data

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“…There are many solubility reports [24,35,36] While Azimi and Papangelakis [36] reported the solubility of anhydrite in the CaSO 4 + NiSO 4 + H 2 O system at 150 and 175 °C (see Fig. 14), data near 100 °C are still unknown, and they are necessary for control of the purification process by crystallization.…”

Section: Caso 4 + Niso 4 + H 2 So 4 + H 2 O Systemmentioning

confidence: 97%

Solubility phenomena involving CaSO4 in hydrometallurgical processes concerning heavy metals

Zeng

Wang

2011

Pure and Applied Chemistry

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Deposit of CaSO 4 in hydrometallurgical processes involving heavy metals usually decreases production quality and harms the production process. To avoid its formation at false time and sites, a sound understanding of the solubility behavior of CaSO 4 in the quaternary systems CaSO 4 + H 2 SO 4 + (heavy metal)SO 4 + H 2 O over large ranges of temperature and concentration is a prerequisite. Up to now, although a large amount of solubility data has been reported in these systems, little information is available on the solubility of anhydrite, especially at salt concentrations near saturation points. In this paper, we introduce the effect of CaSO 4 in hydrometallurgical processes involving heavy metals, review published solubility data of calcium sulfate and its hydrate in relevant systems, and report our newly determined solubility results involving anhydrite in the quaternary systems CaSO 4 + H 2 SO 4 + MSO 4 + H 2 O (M = Cu,Zn,Mn) at 348.1 and 363.1 K. Based on the newly obtained data some application examples were given. On account of the complexity of the solubility phase diagram of these quaternary systems, where the calcium sulfate solubility is a function of its crystal type, temperature, compositions of sulfuric acid, and heavy metal sulfate, a complete solubility phase diagram is not available until some basic data measurement, for instance, water activity at temperatures higher than 298 K, and final modeling has been finished.

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“…Several manganic dithiocarbamates have been prepared which are very similar t o the corresponding ferric compounds. 28 Evidence is given for the view that Re,O, is thc highest oxide of rhenium stable under ordinary condition^.^^ Further work has been published on the oxides and other compounds of ter-,30 q ~a d r i -, ~~ q ~i i n q u e -, ~~ s e ~a -, ~~ and septa-33 valent rhenium, but much of this is in the nature of confirmation of earlier work. Some thermochemical measurements have been made on a few of the septavalent compounds .…”

Section: Group V Imentioning

confidence: 81%

“…-115" it changes into the ordinary form with partial decomposition ; 97% of the theoretical yield of hydrogen peroxide is said to be obtained when hydrazobenzene in alcoholic solutions is converted into azobenzene by the action of gaseous oxygen. 28 The vapour pressures of normal hydrogen (the mixture of orthoand para-hydrogen which is in equilibrium at room temperature) and of para-hydrogen have been measured up to 1 atm. The normal b. p.'s have been determined as -252.754" and -252.871" r e s p e ~t i v e l y .…”

Section: Atmentioning

confidence: 99%

Inorganic chemistry

Bassett¹

1932

Annu. Rep. Prog. Chem.

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The system NiSO₄—CaSO₄—H₂O

Cited by 11 publications

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Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility phenomena involving CaSO4 in hydrometallurgical processes concerning heavy metals

Inorganic chemistry

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The system NiSO4—CaSO4—H2O

Cited by 11 publications

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Solubility of Gypsum in MSO4 Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility of Gypsum in MSO4 Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility phenomena involving CaSO4 in hydrometallurgical processes concerning heavy metals

Inorganic chemistry

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The system NiSO₄—CaSO₄—H₂O

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K

Solubility of Gypsum in MSO₄ Solutions (M = Mg, Mn, Co, Ni, Cu, Zn) at 298.15 K and 313.15 K