Manufacture of ammonium sulfate from gypsum - Google Patents
ammonium sulfate is manufactured from gypsum by a continuous process in which an aqueous flow of material is continously recycled along a predetermined closed circuit defined by a
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Preparing process of ammonia sulfate - Google Patents
A low cost process for preparing ammonium sulphate is characterized in that land plaster with the granularity of 150 to 200 mesh is added into ammonia which contains CO2 and has the
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US8758719B2 - Process for converting FGD gypsum to ammonium
A continuous countercurrent flow process for converting FGD gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the...
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Ammonium sulfate preparation from phosphogypsum waste
2017年1月1日 Ammonium sulfate is prepared by stirring a definite amount of impure or purified phosphogypsum with a suitable amount of ammonium carbonate powder which is suspended
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Red gypsum utilization and acidic wastewater treatment based on
2019年11月15日 The carbon dioxide and ammonia water react with red gypsum to manufacture ammonium sulfate and solid phase products. And solid phase products neutralize pickling
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Utilization of natural gypsum for the preparation of ammonium
2023年1月6日 Ammonium sulfate was prepared by adding a fixed amount of natural gypsum with an appropriate quantity of ammonium carbonate in distilled water at varying temperatures for different contact...
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MANUFACTURE OF AMMONIUM SULFATE FROM GYPSUM
A fresh aqueous gypsum slurry comprising a dis persion of finely divided gypsum in an ammonium sulfate 20 solution is continuously introduced into the flowing mate rial and
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Phosphogypsum Two-Step Ammonia-Carbonation Resulting in
2021年10月18日 Two synthesis methods were used for the conversion of phosphogypsum to ammonium sulfate and calcium carbonate: (i) Two-step method: it consists of reacting
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Kinetics of the conversion reaction of gypsum with ammonium
2018年5月7日 The reactivity of flue gas desulphurization gypsum with ammonium carbonate has been studied in the temperature range (20–50) °C. Mechanism of this reaction was suggested
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Fabrication of a highly permeable composite nanofiltration membrane
2019年1月15日 This result confirmed the successful fabrication of high-performance NF membrane via IP technique by using mixed TAC/TMC as the organic phase monomers. Table 2. Pure water permeability and salt rejection of the PA-TFC NFMs. a. Membranes PWP (L m −2 h −1 bar −1) Salt rejection (%) Na 2 SO 4 MgSO 4 NaCl;
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Glycine-induced synthesis of vaterite by direct aqueous mineral ...
2022年4月15日 Climate change is urgently calling for rapid methods to capture atmospheric carbon dioxide (CO2). CO2 can be sequestred into gypsum from gas desulfurization by carbonation to produce calcium carbonate (CaCO3). However, CaCO3 is produced as a mixture of polymorphs including calcite and vaterite polymorphs, which limits applications. Therefore,
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Fabrication of graphene oxide/ammonium molybdophosphate
6 天之前 Efficient separation of radioactive cesium ions (Cs +) from complicated aqueous environmental media has attracted considerable interest, especially seawater.Ammonium molybdophosphate (AMP) is regarded as a promising adsorbent for Cs +, but its fine powder dramatically inhibits the potential for practical applications.Herein, graphene oxide (GO) was
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Fabrication of B-type carbonate apatite blocks by the ... - PubMed
Diametral tensile strength of the CO3Ap block was approximately 1-3 MPa. Based on the results obtained, it was therefore concluded that gypsum-calcite was a good candidate for the fabrication of CO3Ap blocks, coupled with the advantage that the composite can be molded to any shape by virtue of the setting property of gypsum.
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Desulfurization gypsum carbonation for CO2 sequestration by
2023年2月1日 Desulfurization gypsum sample (20 g) was added into 250 mL of conical flask, followed by addition of a certain amount of ammonium chloride solution in set concentration. The conical flask was placed in a constant temperature water bath shaker for rotation at 180 rpm, letting it react at a certain temperature for a period of time before draining and filtering ( Eq.
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Transformation of 3DP gypsum model to HA by treating in ammonium
DOI: 10.1002/JBM.B.30609 Corpus ID: 12371407; Transformation of 3DP gypsum model to HA by treating in ammonium phosphate solution. @article{Lowmunkong2007TransformationO3, title={Transformation of 3DP gypsum model to HA by treating in ammonium phosphate solution.}, author={Rungnapa Lowmunkong and Taiji Sohmura and Junzo Takahashi and Yumiko Suzuki
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Production, characterisation, and application of titanium gypsum:
2024年1月1日 Titanium gypsum (TG) is a industrial gypsum produced during the manufacture of titanium dioxide (TiO 2) by the sulphuric acid process, after neutralisation of the acid waste solution with lime or calcium carbide slag (Zapata-Carbonell et al., 2019, Zhai et al., 2020).At present, every 1 ton of TiO 2 produced in China generates about 6 ton of TG (Ma, 2022a, Su
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Applications of Gypsum and Ammonium Sulfate Change Soil
2020年6月15日 Applications of Gypsum and Ammonium Sulfate Change Soil Chemical Properties of a Salt-Affected Agricultural Soil June 2020 Journal of Agricultural Science 12(7):1
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Fabrication of calcite blocks from gypsum blocks by
2017年3月1日 Fig. 2 displays typical SEM images of the four types of samples with photographs in Fig. 1.The fractured surface of the set gypsum block [CaSO 4 2H 2 O (0 d)] possessed the typical morphology of set gypsum; in other words, precipitated CaSO 4 2H 2 O crystals interlocked with one another [Fig. 2 (a)]. When the set gypsum was heated at 800 °C, the
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Fabrication of a Novel Nanofiltration Membrane with Enhanced ...
It is known that the polyamide (PA) barrier layer’s inherent microstructure and surface physicochemical properties of thin film composite nanofiltration membrane are crucial for its separation performance. Herein, we designed and synthesized a new zwitterionic aromatic diamine monomer 3-(4-(2-((4-aminophenyl)amino)ethyl)morpholino-4-ium)propane-1-sulfonate
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Ammonium sulfate preparation from phosphogypsum waste
2017年1月1日 Ammonium sulfate is found in the most everyday applications because of their unique chemical and physical properties. Ammonium sulfate is used in the agricultural fertilizer as a source of nitrogen and sulfur for plant nutrients (Schwenke McMullen, 2009).Ammonium sulfate is a mixed fertilizer which contains nitrogen and sulfur nutrients (FAO, 2003, Tisdale,
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FR2516073A1 - Procede de fabrication de granules de nitrate d'ammonium
dans le cadre d'un procede pour la fabrication de granules de nitrate d'ammonium ayant des teneurs en azote d'au moins 25 en poids et contenant eventuellement du carbonate de calcium, on ajoute du gypse a la pate malaxee qui contient du nitrate d'ammonium, a une temperature de 120 a 160c, et on abandonne le melange pendant 5 a 20 minutes a cette temperature, avant
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Fabrication of Hydroxyapatite Block from Gypsum Block Based
Fabrication of Hydroxyapatite Block from Gypsum Block Based on (NH4) 2HPO4 Treatment Yumiko SUZUKII1,2, Shigeki MATSUYA1, Koh-ichi ... Key words : Hydroxyapatite, Gypsum, Ammonium phosphate INTRODUCTION Hydroxyapatite (HAP, Cam (PO4 ) 6 (OH) 2 ) has been used widely in medical and dental fields as a bone substitute ...
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2009年8月1日 Europe PMC is an archive of life sciences journal literature.
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Fabrication - Dome Technology
Dome Technology offers structural-steel systems as part of its services. With a fabrication shop on the same campus as corporate construction headquarters, it’s easy for engineers and construction managers to work closely with team members who build features like stair towers, work towers, conveyor supports, handrails, and walkways.
MoreFabrication of freeform bone-filling calcium phosphate ceramics
Transformation of gypsum model fabricated by three-dimensional printing (3DP) into hydroxyapatite (HA) by treating in ammonium phosphate solution is possible. However, 3DP powder supplied by the manufacturer contains unknown additives which may be ... (POP) powder was used for fabrication in the present study. For accurate ...
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WO2021239764A1 - Procédé pour la fabrication d'une
La présente invention concerne un procédé pour la fabrication d'une composition solide, particulaire, homogène et non explosive comprenant du nitrate d'ammonium. Le procédé comprend les étapes consistant à utiliser une masse fondue de nitrate d'ammonium ; ajouter de l'oxyde de zinc et une matière de charge qui est un composé choisi dans le groupe constitué
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Fabrication of carbonate apatite blocks from set gypsum based
2014年3月8日 Request PDF Fabrication of carbonate apatite blocks from set gypsum based on dissolution-precipitation reaction in phosphate-carbonate mixed solution Carbonate apatite (CO3Ap), fabricated by ...
MoreFabrication of a highly permeable composite nanofiltration membrane
2019年1月15日 This result confirmed the successful fabrication of high-performance NF membrane via IP technique by using mixed TAC/TMC as the organic phase monomers. Table 2. Pure water permeability and salt rejection of the PA-TFC NFMs. a. Membranes PWP (L m −2 h −1 bar −1) Salt rejection (%) Na 2 SO 4 MgSO 4 NaCl;
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FR973296A - Perfectionnements dans la fabrication du sulfate d ...
FR973296A FR973296DA FR973296A FR 973296 A FR973296 A FR 973296A FR 973296D A FR973296D A FR 973296DA FR 973296 A FR973296 A FR 973296A Authority FR France Prior art keywords gypsum manufacture ammonium sulphate sulphate ammonium Prior art date 1941-08-23 Legal status (The legal status is an assumption and is not a legal conclusion.
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