impli ions of mining gypsum


Posted on November 18, 2018



Gypsum - WikipediaGypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer, and as the main constituent in many forms of plaster, blackboard chalk and wallboard. A massive fine-grained white or lightly tinted variety of gypsum, called alabaster,.impli ions of mining gypsum,The dissolution and conversion of gypsum and anhydrite - Scholar .The presence of common ions in solution (ones which are the same as the dissolving mineral, but introduced from some other source), decreases the solubility of the common mineral. CaZ+ is the common ion for gypsum and calcite and the effect occurs in many karst areas where intercala- ted or adjacent sulphate and.


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Dissolution and conversions of gypsum and. (PDF Download .

widely by karst researchers (see White, 1988;. Ford and Williams, 1989; for a description of. the general concept). The saturation index is. defined as the log of the ratio between the ion. activity product for the mineral dissociation. to the equilibrium constant Kg of the. reaction. For gypsum the saturation index is. SIgyp = log(.

Subsidence resulting from the dissolution of Permian gypsum in the .

The implications both of gypsum dissolution and the forceful expansion of anhydrite by . removal of gypsum and possible subsidence caused by large-scale water abstraction and mine dewatering are also . gypsum solubility may also be increased by the presence of other ions in solution such as chloride (Kempe 1972).

Rate of dissolution of gypsum from different sources and its effect on .

May 22, 1989 . Five sources of gypsum (pure, mined and three industrial) were pressed into pellets and their dissolution rate when suspended in water . the impact of water has potentially serious implications for soil water management ... through the maintenance of an elevated ionic strength' of the solution at the soil.

impli ions of mining gypsum,

The dissolution and conversion of gypsum and anhydrite - Scholar .

The presence of common ions in solution (ones which are the same as the dissolving mineral, but introduced from some other source), decreases the solubility of the common mineral. CaZ+ is the common ion for gypsum and calcite and the effect occurs in many karst areas where intercala- ted or adjacent sulphate and.

use of gypsum to improve physical properties and water relations in .

beneficial effects of gypsum were most striking in a heavier sandy clay loam, but lighter sandy loams also . and reduce soil loss, and that the mechanism is primarily an ionic strength effect. A new approach to .. product phosphogypsum was more effective than mined gypsum in this study due to its finer particle size and.

Dissolution and conversions of gypsum and. (PDF Download .

widely by karst researchers (see White, 1988;. Ford and Williams, 1989; for a description of. the general concept). The saturation index is. defined as the log of the ratio between the ion. activity product for the mineral dissociation. to the equilibrium constant Kg of the. reaction. For gypsum the saturation index is. SIgyp = log(.

Subsidence resulting from the dissolution of Permian gypsum in the .

The implications both of gypsum dissolution and the forceful expansion of anhydrite by . removal of gypsum and possible subsidence caused by large-scale water abstraction and mine dewatering are also . gypsum solubility may also be increased by the presence of other ions in solution such as chloride (Kempe 1972).

impli ions of mining gypsum,

Water Chemistry 4 - Inside Mines

calcite (CaCO3) and gypsum (CaSO4-2H2O) which are common in sedimentary rocks. (line is ~10% of . acid mine drainage because exposure of pyrite to oxygen and water produces sulfuric acid. Sulfate (SO. 4 . From sea water Br- ~65 mg/l (~0.2% of ions by mass). • Br is conservative so Br/Cl ratio is used to trace.

Gypsum as an Agricultural Amendment - Department of Food .

gypsum produced in the United States was used in the wallboard industry and only a small amount was used in agriculture. However, FGD gypsum is suitable for agricultural uses and, similar to mined gypsum, can enhance crop production. As with other fertilizers and agricultural amendments, FGD gypsum must be used.

Sulphate and salt minerals: the problem of treating mine waste

for a cationic resin and sodium hydroxide for an anionic resin. Similar to reverse osmosis, scaling of CaSO4 is common in conventional circuits. To overcome these problems a modified form of ion exchange has been developed to treat Ca- sulphate waters, for example the GYPCIX. (Gypsum Ion Exchange) process offered.

Secular variation in the major-ion chemistry of seawater: Evidence .

ion components. Significant changes in the major-ion chemistry of Cretaceous seawater may have influenced the mineralogy of abiotically precipitated marine . Mineral. Formula. Calcite. CaCO3. Aragonite. CaCO3. Dolomite. CaMg(CO3)2. Magnesite. MgCO3. Gypsum. CaSO42H2O. Anhydrite. CaSO4. Halite. NaCl.

Brazilian coal mining residues and sulphide oxidation by Fenton's .

Feb 15, 2011 . Fenton's reaction is proposed as an accelerated weathering test for sulphides associated with Brazilian Coal Mining Residues (CMR), that are exposed to ... In this step of the oxidation process, gypsum is formed by reaction of the freshly oxidised sulphate species and the calcium ions released by the acid.

Gypsum Literature Review - Standards Oversight Council

Feb 12, 2015 . lower cost (compared to mined gypsum) and the increased supply and distribution of sources near . Gypsum alleviates this issue when its calcium ions displace aluminum ions from the soil's exchange sites. .. desulfurization gypsum: Implication for runoff and nutrient losses associated with broiler litter.

Effect of Mg2+ Ions on the Nucleation Kinetics of Calcium Sulfate in .

May 19, 2010 . Effect of Mg2+ Ions on the Nucleation Kinetics of Calcium Sulfate in Concentrated Calcium Chloride Solutions. Baohong Guan, Liuchun Yang .. Variation of gypsum morphology along deep core SG-1, western Qaidam Basin (northeastern Tibetan Plateau) and its implication to depositional environments.

impli ions of mining gypsum,

Sulfates - Lenntech

Introduction. Sulfate (SO4) can be found in almost all natural water. The origin of most sulfate compounds is the oxidation of sulfite ores, the presence of shales, or the industrial wastes. Sulfate is one of the major dissolved components of rain. High concentrations of sulfate in the water we drink can have a laxative effect.

life cycle analysis of gypsum board and associated finishing products

implications of alternative building or assembly designs. . help users understand the environmental implications of different material mixes or other design ... McKay Settlement. Open-pit mining. Domtar Inc. Windsor. Plaster manufacture. Fundy Gypsum Company Limited. Wentworth and Miller Creek Open-pit mining.

impli ions of mining gypsum,

Sustainable Uses of FGD Gypsum in Agricultural . - PubAg - USDA

The use of gypsum, however, was largely discontinued in the United States due to extraction and transportation cost from mines, primarily in. Nova Scotia (Canada), to markets in the . available Ca and SO4 ions for plant nutrition (Table 1; Shainberg ... Flue Gas Desulfurization Gypsum: Implication for Runoff and Nutrient.

Social and Environmental Impact of the Rare Earth Industries - MDPI

Feb 13, 2014 . Additional rare earth mining comes from ion-adsorbed clay deposits, which are particularly . implications since waste management requires an immediate disposal plan whereas potentially useful material . discharge; gypsum; magnesium-content gypsum and iron phosphor-gypsum (with thorium content).

groundwater management in mining areas - Umweltbundesamt

Dec 22, 2003 . IN MINING AREAS. Proceedings of the 2nd IMAGE-TRAIN. Advanced Study Course. Pécs, Hungary, June 23-27, 2003. EUROPEAN COMMISSION ... The implications of the above for physical hydrogeology of mined ground. Types of Mine .. In water of pH = 3, the activity is 10-3 mole/l hydrogen ions.

Heavy Metals from Acid Mine Drainage in Coal . - Semantic Scholar

Acid drainage is most common problem or associated with almost all mines containing sulphide deposits and coal containing high pyrite. . ecological implications [2, 24-27]. Acid water, also . water and oxygen, oxidation and hydrolysis reactions produce sulphuric acid (H2SO4) and free hydrogen ions (H+), acidifying the.

Groundwater flow and its effect on salt dissolution in Gypsum .

Jan 1, 2013 . Reitman, Nadine Ginsberg, "Groundwater flow and its effect on salt dissolution in Gypsum Canyon watershed, Paradox Basin, ... discussion of the model results and implications of the study, and concluding remarks. ... Nuckolls and McCulley (1987) analyzed Cl/Br and Na/Cl ion ratios and stable isotopes.

Rare Earth Elements in Acid Mine Drainage

Acid Mine Drainage (AMD) may contain REY in concentration various orders of magnitude higher than the . important economic implications, because HREE and MREE are priced higher than. LREE (most traded REE . whereas the rest of production (accounting for 6-7%) comes from ion-adsorption clays deposits (Kinicky.

Anna Szynkiewicz's CV - Department of Earth and Planetary Sciences

geochemical analogue for sulfate-mineral deposition on Mars” – NASA grant awarded to PI-Szynkiewicz . gypsum dunes – implications for Mars analogue studies”. Mar 2008. New Mexico State University . analysis of major cations and anions dissolved in waters using ion chromatography and atomic absorption methods.

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