EP0064793B1
A process for preparing shaped articles from waste gypsum from wet-process phosphoric acid production comprises: (1) mixing wet calcium sulfate hemihydrate with 0.5-20% by wt. of calcium hydroxide or calcium oxide, (2) adjusting the total water content of said mixture to 20-40% by wt., if necessary, and (3) molding shaped articles from said mixture by compression molding.
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Five Stages of Gypsum Production Process
Small plants can produce a few tonnes daily with manual technologies, and large-scale operations can support thousands of tonnes daily with sophisticated equipment. Nevertheless, they all go through the same basic 5 steps or …
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Artificial aging of gypsum binder in terms of thermodynamics
The studied thermodynamic analysis of the process has showed that the most significant change of the primary structure of gypsum stone occurs under the conditions of aging.
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I. The European Gypsum Industry: Background
VI. Natural Gypsum Production 1 Global output of gypsum rose from about 42Mt in 1960 to a peak of around 112Mt in 1999, an average annual growth rate of around 2.6%. World output then declined to around 108Mt in 2001 before rising to 111Mt in 2003. World production of gypsum and anhydrite is concentrated in North America, Western Europe and Asia.
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Gypsum products and process of manufacture
United States Gypsum Company: Gypsum wallboard and process for making same US4018963A (en) * : : Taisei Kensetsu Kabushiki Kaisha: Large lightweight gypsum article and a process for the production thereof US4187130A (en) * : : H. H. Robertson Company
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Gypsum Manufacturing Process & Gypsum Processing Equipment
The gypsum manufacturing process may vary slightly depending on the specific product being produced and the manufacturer's equipment and methods. Nonetheless, the …
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Application of phosphogypsum for the improvement of eco …
Phosphogypsum (PG) is a waste obtained in the phosphoric acid (PA) manufacturing process, produced in large quantities, especially from the soil fertilizer industry. Alternatively, in the disposal of these materials in landfill, several investigations have applied PG as a substitute for natural gypsum in the production of Portland cement to ...
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METHOD OF PROVIDING DRY ADDITIVES FOR A …
board manufacturing process. BACKGROUND [0002] Gypsum board is commonly employed in drywall construction of interior walls and ceilings and also has other applications. Generally, these gypsum boards are formed from a gypsum slurry including a mixture of calcined gypsum, water, and other additives. In certain gypsum board manufacturing
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Waste-derived synthetic gypsum could replace the real thing
as i remember the gypsum plant in Newington, NH gets a lot of wall board & somehow they process it. Worzel August 2, 2021 02:18 PM @paul314 Yes, especially reinforced concrete which often ends up ...
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Review of gypsum reinforced composites as building materials
The utilization of gypsum reinforced composites as building materials has garnered considerable attention owing to their exceptional amalgamation of mechanical strength, fire resistance, and versatile applications. This review initiates by introducing gypsum as a pivotal mineral in construction, subsequently exploring the concept of composite materials and …
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What is Synthetic Gypsum?
Synthetic gypsum is the name used to classify a variety of by-products that can serve as an alternative to natural gypsum. The most common gypsum by-product is FGD gypsum, formed from coal-fired power plants, though synthetic …
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Engineering Solid Mechanics
But, on the other hand, high dispersion of precursors is a key factor for producing artificial gypsum stone using the powder-reaction mechanism, which has proven its effectiveness (Petropavlovskii et al., 2021; Petropavlovskaya et al., ... technical and economic indicators of the entire production process, and, in particular, will reduce energy ...
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Factsheet on: What is Gypsum?
quantity. World production of Titanium Dioxide is approximately 4 mio tonnes/year, of which about one-half is produced by the Sulphate process, the other half by the Chloride process. Only the Sulphate process outputs Gypsum, of which a maximum of about 50%, is the so called 'White Gypsum', which can be considered for use by the Gypsum ...
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Activated gypsum and its production process
The present invention is mainly aimed at providing a method for making activated gypsum by using industrial gypsum, which is characterized by that the industrial gypsum is calcined which made into anhydrous gypsum, and the activity of anhydrous gypsum can be raised, and said invented activated gypsum is superior to natural gypsum in properties, can be used for …
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Synthetic Gypsum Processing Equipment
EQUIPMENT. FEECO provides a variety of equipment and services for all types of synthetic gypsum. From initial feasibility testing, to process scale-up and the manufacture of custom synthetic gypsum processing equipment, we can …
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CN1188747A
A process for producing series of gypsum products with waste dregs from production of citric acid includes such technological steps as dewatering the waste dregs to obtain plaster, baking, grinding to obtain beta-type plaster, sieving by 1-8 cu.cm, high-pressure digestion, drying, grinding to obtain alpha-type gypsum, and low-temp drying (or natural drying) to obtain setting retarder, …
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11.16 Gypsum Manufacturing
Gypsum is calcium sulfate dihydrate (CaSO4 2H2O), a white or gray naturally occurring mineral. Raw gypsum ore is processed into a variety of products such as a portland cement additive, …
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Plastic molds for artificial stone | Molds for decorative stone, gypsum
Do-it-yourself production of artificial stone means: no transportation costs, low cost, pleasure from ease of manufacture and excellent end result. The process of making tiles from plaster or concrete is extremely simple: place the molds for artificial stone on a flat surface, lubricate the molds with a release agent, and leave to dry for 3-5 ...
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FGD Gypsum Production Process
Utilities that produce panel-grade synthetic gypsum beneficially reuse FGD sludge rather than landfilling the material. A multistage production process is necessary to transform the SO 2 in …
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GB1007898A
GB1007898A GB3843561A GB3843561A GB1007898A GB 1007898 A GB1007898 A GB 1007898A GB 3843561 A GB3843561 A GB 3843561A GB 3843561 A GB3843561 A GB 3843561A GB 1007898 A GB1007898 A GB 1007898A Authority GB United Kingdom Prior art keywords slurry phosphoric acid line calcium sulphate hydration Prior art date …
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Artificial Neural Networks in Manufacturing Processes: Monitoring …
MONITORING AND CONTROL ISSUES Most of manufacturing process have the characteristics of uncertain, time-varying, highly nonlinear and complex system. ... "Predictive Control shape classification method using neural network in high of Quality in a Batch Manufacturing Process Using Artificial frequency electric resistance welding", J. KSPE, Vol ...
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Synthetic Gypsum Manufacturing Plant Report 2024: Project …
IMARC Group's report, titled "Synthetic Gypsum Manufacturing Plant Project Report 2024: Industry Trends, Plant Setup, Machinery, Raw Materials, Investment …
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Cement: History, Types, Manufacturing Process
There exists evidence indicating that the Minoans residing in Crete employed crushed potsherds as an artificial pozzolan in the production of hydraulic cement. ... To effectively control the process, a retarding agent called gypsum (CaSO 4.2H 2 O) is commonly employed. This substance is added in a proportion of approximately 2% of the total ...
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Synthetic Gypsum in Construction: Types, Production, and Benefits
Production of Synthetic Gypsum. The creation of synthetic gypsum is a sophisticated process that begins with the capture of industrial by-products. One of the most …
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Influence of the Calcination Temperature of Synthetic Gypsum on …
The paper assesses the influence of the calcination temperature of synthetic gypsum binder on the binding properties of innovative gypsum pastes, as well as on masonry and plastering mortars. The calcination process of gypsum binder was carried out at four different temperatures ranging from 170 to 190 °C. The specimens for testing were prepared on the …
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Making Gypsum Board
ASTM standards govern the manufacture of gypsum board and set strict criteria for strength, water resistance, and other characteristics. To produce gypsum board, crushed natural gypsum or synthetic gypsum is heated or calcined to …
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Securing gypsum demand in cement industry by gypsum by …
The latest literature reviews [[30], [31], [32]] have previously provided a comprehensive overview of the state-of-the art based on the utilization of gypsum resources, including PG and FGDG, in various cementitious materials including cement, plaster and bricks.Moreover, the performance of PG and FGDG in cementitious materials has …
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Essential Raw Materials for Gypsum Board Production
This includes the incorporation of recycled gypsum into the production process. Recycling gypsum not only reduces landfill waste but also lowers material costs and conserves resources. In our recent survey conducted among professionals in the construction and manufacturing sectors, we gathered insights on the essential raw materials and trends ...
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The Rise of Synthetic Gypsum in Modern Construction
Synthetic gypsum, also known as desulfurized gypsum or flue-gas desulfurization (FGD) gypsum, is a byproduct of the flue-gas desulfurization process in coal-fired power plants.
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