sulfuric acid from fluorogypsum
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US5174972A - Fluorogypsum waste solidification material ...
A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until the ...
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Fluorogypsum waste solidification material - AZAR; DAVID G.
1990-6-18 A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until the ...
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UG-Mat Sulfate Wastes Recycled Materials Resource Center
Fluorogypsum is generated during the production of hydrofluoric acid from fluorspar (a mineral composed of calcium fluoride) and sulfuric acid. Fluorogypsum is discharged in slurry form and gradually solidifies into a dry residue after the liquid has been allowed to evaporate in holding ponds.
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Estimating Sulfate Effective Diffusion Coefficients of ...
2019-12-12 Fluorogypsum (FG) is generated as a by-product of the combi-nation of fluorspar with sulfuric acid. Approximately 894,000 t of FGareproducedeachyearintheUS.(Lassenetal.1992).TheEPA has determined that the chemical concentrations in FG are not ex-pected to pose a risk to human health and the environment (USEPA 1990).
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Use of Fluorogypsum to Reduce Subsoil Acidity in a ...
Fluorogypsum is a by-product produced from the manufacture of hydrofluoric acid from fluorospar and sulfuric acid. It is composed of calcium, sulfate and water. In addition to supplying nutrients, gypsum has been shown to reduce the level of exchangeable acidity in the subsoil
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Synergistic effects of rubber-tire-powder and
2021-6-1 The reaction between sulfuric acid (H 2 SO 4) and fluorite (CaF 2) generates HF and CaSO 4, as indicated by Eq. : (2) C a F 2 + H 2 S O 4 → C a S O 4 + H F. This fluorogypsum has always H 2 SO 4 remaining adsorbed on the surface and its acidic pH must be neutralized for use in
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Gypsum - Nature's Way Resources
2014-3-19 This is produced from neutralization of waste sulfuric acid by limestone or lime in pickle production. Generally it is pure gypsum with a few trace elements. Titanogypsum. Byproduct from manufacturing titanium dioxide. Borogypsum. Byproduct from manufacturing boron containing compounds. Fluorogypsum
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(PDF) Enhanced Performance of Stabilized By-Product
2005-12-1 During the manufacturing process of hydrogen fluoride, fluorspar reacts with sulfuric acid to form hydrogen fluoride gas and calcium sulfate or gypsum (fluorogypsum, CaSO 4 ⅐ 2H 2 O) (16)(17)(18).
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(PDF) Production of calcium sulphate alpha-hemihydrate ...
The gypsum obtained from citric acid, hydrofluoric acid, titanium dioxide and phosphoric acid manufacturing processes is called as citrogypsum (Kostić et al., 2000), fluorogypsum (Garg Pundir ...
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US5174972A - Fluorogypsum waste solidification material ...
A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until the ...
Read More
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UG-Mat Sulfate Wastes Recycled Materials Resource Center
Fluorogypsum is generated during the production of hydrofluoric acid from fluorspar (a mineral composed of calcium fluoride) and sulfuric acid. Fluorogypsum is discharged in slurry form and gradually solidifies into a dry residue after the liquid has been allowed
Read More
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Fluorogypsum waste solidification material - AZAR; DAVID G.
1990-6-18 A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until the ...
Read More
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Estimating Sulfate Effective Diffusion Coefficients of ...
2019-12-12 Fluorogypsum (FG) is generated as a by-product of the combi-nation of fluorspar with sulfuric acid. Approximately 894,000 t of FGareproducedeachyearintheUS.(Lassenetal.1992).TheEPA has determined that the chemical concentrations in FG are not ex-pected to pose a risk to human health and the environment (USEPA 1990).
Read More
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Use of Fluorogypsum to Reduce Subsoil Acidity in a ...
Fluorogypsum is a by-product produced from the manufacture of hydrofluoric acid from fluorospar and sulfuric acid. It is composed of calcium, sulfate and water. In addition to supplying nutrients, gypsum has been shown to reduce the level of exchangeable acidity in the subsoil
Read More
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Synergistic effects of rubber-tire-powder and
2021-6-1 The reaction between sulfuric acid (H 2 SO 4) and fluorite (CaF 2) generates HF and CaSO 4, as indicated by Eq. : (2) C a F 2 + H 2 S O 4 → C a S O 4 + H F. This fluorogypsum has always H 2 SO 4 remaining adsorbed on the surface and its acidic pH must be neutralized for use in
Read More
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Development of new pH-adjusted fluorogypsum-cement
2019-12-12 2019-12-12 the reaction of the alkali materials with the residual sulfuric acid in the slurry FG. Blends of pH-adjusted FG with other cementitious materials (e.g., Portland cement, fly ash, lime, and/or ground granulated blast furnace slag) have recently attracted the attention of researchers for use as pavement base materials [14–16], as a non-structural
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Thermoplastic railroad cross-ties - Compositech, L.L.C.
Fluorogypsum may also be obtained by various processes such as a byproduct produced from the reaction of fluorspar with sulfuric acid in the production of hydrofluoric acid, see Azar Fluorogypsum Waste Solidification Material U.S. Pat. No. 4,935,211 issued
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(PDF) Enhanced Performance of Stabilized By-Product
2005-12-1 During the manufacturing process of hydrogen fluoride, fluorspar reacts with sulfuric acid to form hydrogen fluoride gas and calcium sulfate or gypsum (fluorogypsum, CaSO 4 ⅐ 2H 2 O) (16)(17)(18).
Read More
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(PDF) Production of calcium sulphate alpha-hemihydrate ...
The gypsum obtained from citric acid, hydrofluoric acid, titanium dioxide and phosphoric acid manufacturing processes is called as citrogypsum (Kostić et al., 2000), fluorogypsum (Garg Pundir ...
Read More
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Preliminary Laboratory Evaluation of By-Product Gypsum
2004-2-27 fluoride) reacts with condensed sulfuric acid (H 2SO 4) to form HF gas and calcium sulfate or gypsum (CaSO 42H 2O), i.e., fluorogypsum. One possible application for the use of FG is in highway construction. As a low-cost recycled material, the Louisiana Department of Transportation and
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Background Document for Capacity Analysis for Land ...
2016-3-27 Fluorspar and Hydrofluoric Acid Raw fluorspar ore is crushed, ground, and concentrated. Acid grade fluorspar (a pure form of concentrate) is mixed with sulfuric acid in a heated retort kiln, reacting to produce hydrogen fluoride gas and fluorogypsum. The gas is cooled, scrubbed, and condensed, and sold as either hydrofluoric acid solution
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Chapter Nine - Manufacturing and Construction
The fluorogypsum byproduct (RMRC 2008; TFHRC 2009) is the result of combining fluorspar and sulfuric acid and is discharged in slurry that solidifies over time in the holding ponds, and then must be crushed and separated if the byproduct is to be used.
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Gypsum - Nature's Way Resources
2014-3-19 This is produced from neutralization of waste sulfuric acid by limestone or lime in pickle production. Generally it is pure gypsum with a few trace elements. Titanogypsum. Byproduct from manufacturing titanium dioxide. Borogypsum. Byproduct from manufacturing boron containing compounds. Fluorogypsum
Read More
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Development of new pH-adjusted fluorogypsum-cement
2018-9-10 A composition with 62% pH-adjusted fluorogypsum, 35% fly ash, and 3% Portland cement was selected based on strength and volumetric expansion properties to conduct additional experimental studies to quantify its modulus of elasticity, Poisson’s ratio, setting times, density, void contents, and curing time effects on strength and volumetric ...
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Modification of waste fluorgypsum and its applications as ...
2011-10-5 The waste fluorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy (SEM) and eight-channel micro-calorimeter (TAM Air) were employed to analyze the changes in morphology and study the application performance of the modified fluorgypsum, respectively.
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Rule 3745-51-04 - Ohio Administrative Code Ohio Laws
2020-10-5 (x) Fluorogypsum from hydrofluoric acid production. (xi) Process wastewater from hydrofluoric acid production. (xii) Air pollution control dust or sludge from iron blast furnaces. (xiii) Iron blast furnace slag. (xiv) Treated residue from roasting or leaching of chrome ore.
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Use of By-Product Phosphogypsum In Road Construction
tilizers. Of the several di~ rent phosphori acid production proce ses, the wet process is the most frequently used (1). In the wet proce s finely ground phosphate rock aioF~(P0~)6, is dis olved in pho phoric acid to form a monocalcium phos phate solution. Sulfuric acid, which i added to the slurry.
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261.4 a-b - labtrain.noaa.gov
2001-12-9 (7) Spent sulfuric acid used to produce virgin sulfuric acid, unless it is accumulated speculatively as defined in §261.1(c) of this chapter. (8) Secondary materials that are reclaimed and returned to the original process or processes in which they were generated where they are reused in the production process provided:
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GYPSUM - Nature's Way Resources
2014-3-19 Fluorogypsum - is a byproductof producinghydrofluoric acidfromfeldspars Manyothertypesexist suchas Citrogypsum, Kevlargypsum,etc. DrywallGypsum Drywallor sheetrock consistsof gypsumwith a thinpaperbacking.It may containverysmall amountsof otheringredients fromimpurities such as calciumcarbonate (CaCO3),calciumhydroxide (Ca(OH) 2),
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