Solubility of Calcium Sulphate in Aqueous Solutions of Sulphuric Acid

Cameron, Frank K.; Breazeale, J. F.

doi:10.1021/j150053a003

Cited by 17 publications

(14 citation statements)

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“…There are a large number of reports [15][16][17][18][19][20] concerning the solubility of calcium sulfate in its three hydrates in the CaSO 4 + H 2 SO 4 + H 2 O system, as shown in Figs. 1-3. Although there are some slight disagreements, the solubility curves of gypsum generally show the same tendency at each temperature; it rises and then falls with increasing H 2 SO 4 content.…”

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

confidence: 99%

“…Wollmann and Voigt [24] applied inductively coupled plasma-optical emission spectroscopy (ICP-OES) to analyze calcium contents and set the equilibrium time from 11 to 50 d, and their reported solubility data for gypsum at 298. 15 Dutrizac and Kuiper [28] studied the solubility behavior of gypsum and anhydrite in quite typical Cu-electrolyte solutions in the temperature range 298-368 K, as shown in Figs. 5 and 6.…”

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

Solubility phenomena involving CaSO4 in hydrometallurgical processes concerning heavy metals

Zeng

Wang

2011

Pure and Applied Chemistry

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“…Christov and N. Moller correlation are taken from Cameron and Breazeale (1903) (25 o -43 o C, gypsum solubility), Marshall and Jones (1966) (25 o -60°C, gypsum solubility; 125°-250 o C, anhydrite solubility; 125°C, metastable hemihydrate solubility), Zdanovskii and Vlasov (1967) (gypsum solubility at 25°C), Zdanovskii and Vlasov (1968a) (gypsum solubility at 10°C) and Zdanovskii et al (1968) (gypsum solubility at 75°C). The data for metastable hemihydrate and metastable anhydrite crystallization from 10 o to 95 o C (Zdanovskii and Vlasov (1967, 1968a, 1968b and Zdanovskii et al (1968)) are not used in evaluating the model parameters.…”

mentioning

confidence: 99%

A chemical equilibrium model of solution behavior and solubility in the H-Na-K-Ca-OH-Cl-HSO4-SO4-H2O system to high concentration and temperature

Christov

Møller

2004

Geochimica et Cosmochimica Acta

115

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“…The measured weight change cannot be attributed to air drying, even assuming a variable air relative humidity when water moves vertically in the piezometer. It might reflect the role of H 2 S gas released by water (as testified by the offensive rotten eggs smell and by the relatively high 20 ppmv hydrogen sulphide gas concentration measured in PZ23 in September 2013; see further on) plus oxygen, that may form a water film of adsorbed sulfuric acid quickly increasing the solubility of Ca-sulphate phases [56][57][58].…”

Section: Idmentioning

confidence: 99%

Evaporite Dissolution Rate through an on-site Experiment into Piezometric Tubes Applied to the Real Case-Study of Quinis (NE Italy)

et al. 2019

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The present paper deals with a field experiments on evaporite rock samples and groundwater investigations in the Quinis test site, a hamlet of the Enemonzo municipality in NE Italy, were sinkholes occurred in the past and are still occurring causing severe damage to the existing infrastructures. The area is characterised by a Carnian evaporitic bedrock made of gypsum and anhydrite mantled by alluvial and colluvial deposits. In order to evaluate the loss of weight and volume of the subcropping evaporites as responsible for sinkholes, a field-experiment was carried out. Inside seven piezometers, at different depths, evaporitic rock samples were exposed to the naturally occurring variable climatic conditions such as degree of humidity, different air flow and hydrodynamic. The rock samples were installed at the beginning of April 2017 in the dry sections of piezometric tubes, in the vadose zone and in the phreatic zone. Data related to water level fluctuations were recorded by using data-logger devices and highlight significant changes in the water table. After 13 months of data recording (May 2018), rock samples were removed, reweighted and the volume loss measured. In addition, water from piezometer-experiment, representative of the groundwater circulation, were collected at different depths. The obtained results indicate that rock sample reduction is dependent on the hydrological regime and water chemistry and not on the number of days during which the samples remained submersed. In particular, the water geochemistry highlights the possible role in gypsum/anhydrite dissolution due to NaCl water admixing in a complex scenario. In additional, the geochemical data highlight the occurrence of some potentially toxic elements (As, Fe, Mn) at concentrations of concern in some water. This approach represents a novel contribution in the study of karst hazard in evaporites adding a tile to the knowledge of the fast evolutionary processes which cause sinkhole formation.

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Solubility of Calcium Sulphate in Aqueous Solutions of Sulphuric Acid

Cited by 17 publications

References 0 publications

Solubility phenomena involving CaSO4 in hydrometallurgical processes concerning heavy metals

Solubility phenomena involving CaSO4 in hydrometallurgical processes concerning heavy metals

A chemical equilibrium model of solution behavior and solubility in the H-Na-K-Ca-OH-Cl-HSO4-SO4-H2O system to high concentration and temperature

Evaporite Dissolution Rate through an on-site Experiment into Piezometric Tubes Applied to the Real Case-Study of Quinis (NE Italy)

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