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method of preparing of gypsum

method of preparing of gypsum

US4443261A - Method of preparing gypsum articles -

Method of preparing gypsum articles Download PDF Info Publication number US4443261A. US4443261A US06/416,024 US41602482A US4443261A US 4443261 A US4443261 A US 4443261A US 41602482 A US41602482 A US 41602482A US 4443261 A US4443261 A US 4443261A Authority US United States Prior art keywords potassium plaster calcium sulfate

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Method of preparing gypsum mortar with modifiers and ...

The method of preparing gypsum mortar involves obtaining a certain amount of dry components containing gypsum plaster; preliminary dissolution of the modifier and plasticiser in water to obtain a solution, where the modifier is selected from a group comprising potassium phosphonate and carbonate; and mixing the said solution with the dry ...

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Method of preparation of gypsum cement-puzzolan mix

FIELD: construction. SUBSTANCE: method of obtaining of gypsum cement-puzzolan mix includes hydroactivation of portland cement with surfactants for 1 min. with the subsequent adding of gypsum and puzzolan component and repeated hydroactivation

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Method of preparing gypsum articles - Tenax Maskin AB

Method of preparing gypsum articles . United States Patent 4443261 . Abstract: Plaster products can be prepared from calcium sulfate dihydrate by adding to a water slurry of calcium sulfate dihydrate a potassium salt, especially potassium hydrogen-carbonate or potassium tetraborate but, in the first place, potassium sulfate, including a carrier ...

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LIGHTWEIGHT GYPSUM BASED MATERIALS: METHODS

2016-10-4  The main methods of the preparation of gypsum-based lightweight materials are described and com - pared. Gypsum can be lightened indirectly by the lightweight filler or directly.

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Lightweight Gypsum Based Materials: Methods of Preparation ...

method, the aerated autoclaved concrete (AA C) is produced. 2 Al + 3 Ca (OH) 2 + 6 H 2 O → 3 CaOAl 2 O 3 6H 2 O + 3 H 2 (5) Reaction (5) could not be used for the foaming of gypsum

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Method of preparing water-resistant gypsum binder

In the method of preparing water-resistant gypsum binder, which involves mixing ground gypsum dihydrate with an additive and subsequent thermal treatment of the mixture until conversion of the gypsum dihydrate to hemihydrate, the additive used is microsilica and amphoteric hydroxide. Before thermal treatment, the mixture is pressed at pressure ...

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Lightweight Gypsum Based Materials: Methods of Preparation ...

2017-2-1  The lightweight gypsum materials can be used in a similar way as an aerated autoclaved concrete (AAC), whose energy consumption at production is several times higher. The main methods of the preparation of gypsum-based lightweight materials are described and compared. Gypsum can be lightened indirectly by the lightweight filler or directly.

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GYPSUM SET ACCELERATOR AND METHOD OF PREPARING

2018-3-12  A modified gypsum set accelerator and a method of preparing the same is provided, which includes dry loose finely ground particles of a mixture of ground dry calcium sulfate dihydrate and a grinding aid selected from one or more of beta-naphthalene sulfonate formaldehyde condensate, trimetaphosphate phosphate salt, tripolyphosphate salt, tetra-pyrophosphate salt, and pregelatinized

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Standard Test Methods for Chemical Analysis of Gypsum

2015-2-21  1 These test methods are under the jurisdiction of ASTM Committee C11 on 7. This will be the weight of the dried sample. Gypsum and Related Building Materials and Systems and are the direct responsi-bility of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products. Current edition approved Dec. 10, 2001. Published February 2002.

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Lightweight Gypsum Based Materials: Methods of Preparation ...

2017-2-1  The lightweight gypsum materials can be used in a similar way as an aerated autoclaved concrete (AAC), whose energy consumption at production is several times higher. The main methods of the preparation of gypsum-based lightweight materials are described and compared. Gypsum can be lightened indirectly by the lightweight filler or directly.

Get Price

Lightweight Gypsum Based Materials: Methods of Preparation ...

method, the aerated autoclaved concrete (AA C) is produced. 2 Al + 3 Ca (OH) 2 + 6 H 2 O → 3 CaOAl 2 O 3 6H 2 O + 3 H 2 (5) Reaction (5) could not be used for the foaming of gypsum directly ...

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Method of preparation of gypsum cement pozzolan mix ...

2014-4-14  (22) 14.04.2014 (45) 20.05.2015 (57) Method of obtaining of gypsum cement-puzzolan mix includes hydroactivation of portland cement with surfactants for 1 min. with the subsequent adding of gypsum and puzzolan component and repeated hydroactivation within 2 min., in the rotor and pulsation device with a shaft speed of rotation no less than 5000 rpm, the surfactant is a mix of polymeric ...

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Preparation Method and Application of Gypsum Whisker

Gypsum whisker is a environmental-friendly material with high mechanical property and high cost performance, which can be used in the fields of composite materials, paper making, catalysis and ...

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US Patent for Methods of preparing gypsum wallboards ...

Methods of preparing gypsum wallboards containing styrene butadiene latex additive . Jan 7, 2003 - National Gypsum Properties, LLC. Gypsum wallboard compositions are disclosed which contain functionalized styrene butadiene latex polymers. Methods for the use of the compositions in the manufacture of wallboard panels and sheets is presented.

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CN101798240A - Method for preparing urea gypsum fertilizer ...

The invention discloses a method for preparing a urea gypsum fertilizer by ball milling of gypsum, which is characterized by comprising the following steps: preparing urea gypsum from hypsum and urea, and exceeding 1 to 2 weight percent of the use amount of Ca2SO4.2H2O in a stoichiometric ratio of the Ca2SO4.2H2O to CO(NH4)2 in reaction; converting the Ca2SO4.2H2O content in the gypsum into ...

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Gypsum set accelerator and method of preparing same ...

2018-10-25  (22) 12.03.2018 (43) 25.10.2018 (57) A modified gypsum set accelerator and a method of preparing the same is provided, which includes dry loose finely ground particles of a mixture of ground dry calcium sulfate dihydrate and a grinding aid selected from one or more of beta-naphthalene sulfonate formaldehyde condensate, trimetaphosphate phosphate salt, tripolyphosphate salt, tetra

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Preparation of α-hemihydrate gypsum from

2021-8-15  Preparation of α-hemihydrate gypsum (α-HH) from phosphogypsum (PG) by atmospheric hydrothermal method has a good application prospect due to the mild reaction conditions, the solution medium and modifier are important factors to control the formation and growth of α-HH crystals.

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Method Statement-Gypsum Board Installation to Wall

2021-2-10  Purpose of the Method of Statement. The Objective of this Method Statement is to describe the steps involved in gypsum board installation to the wall as drywall and partition all following approved shop drawings, ensuring safety, perfection and durability.

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IV. METHODS OF SAMPLE PREPARATION AND X-RAY

2007-5-24  SAMPLE PREPARATION The method of sample preparation is nondestructive (except for grinding) and the sediment fractions can be recovered for further testing or refinement. An excep-tion to this is that calcite, aragonite and, to some extent, dolomite, gypsum, and anhydrite are dissolved in the decalcification process.

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Proper Preparation of Gypsum Concrete Substrates Prior to ...

2020-5-21  There are several methods of moisture testing of gypsum underlayment. The oldest method is the use of a 24” X 24” (609mm X 609mm) mat or taped down plastic. Another method is the use of a moisture meter with needle probes (shown). The reading should be 5% or less for glued down materials.

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Preparation of Gypsum-Concrete Substrates - Stover's ...

2015-6-24  Preparation of Gypsum-Concrete Substrates Gypsum-concrete has been a growing segment for underlayment for the past three decades. It can be found in many residential and few commercial applications. My sources tell me there is over a billion square feet in use today. Gypsum underlayment is mostly found in multiple-use dwellings. Normally, it is installed over a wood subfloor and is usually ¾ ...

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Preparation Method and Application of Gypsum Whisker

Gypsum whisker is a environmental-friendly material with high mechanical property and high cost performance, which can be used in the fields of composite materials, paper making, catalysis and ...

Get Price

Lightweight Gypsum Based Materials: Methods Of Preparation ...

The lightweight gypsum materials can be used in a similar way as an aerated autoclaved concrete (AAC), whose energy consumption at production is several times higher. The main methods of the preparation of gypsum-based lightweight materials are described and compared. Gypsum can be lightened indirectly by the lightweight filler or directly.

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Preparation of sulfoaluminate cementitious material using ...

2020-6-5  The production of titanium dioxide (a necessary industrial color additive) can generate massive amount of titanium gypsum, a hard-to-treat solid waste. Diverse metallic impurities, heavy metals and reddish color in titanium gypsum make it difficult to be used in building materials like other by-product gypsums. As a result, most of titanium gypsum in China is just stored and has caused serious ...

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Standard Test Methods for Chemical Analysis of Gypsum and ...

C317/C317M Specification for Gypsum Concrete. C778 Specification for Standard Sand. C842 Specification for Application of Interior Gypsum Plaster. D1193 Specification for Reagent Water. D1428 Test Method for Test for Sodium and Potassium In Water and Water-Formed Deposits by Flame Photometry. D2013 Practice for Preparing Coal Samples for Analysis

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A New Preparation Method of Microfauna from Gypsum ...

Evaporitic gypsum deposits represent an important paleoenvironmental record of the Miocene Badenian of the Carpathian Mountains belt. In this study, we developed a nontoxic method to concentrate calcareous microfossils from gypsum (CaSO42H2O), by treating the sulfate with ammonium acetate. We applied the newly developed method to gypsum collected from the Evaporitic Formation outcropping ...

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US Patent for Methods of preparing gypsum wallboards ...

Methods of preparing gypsum wallboards containing styrene butadiene latex additive . Jan 7, 2003 - National Gypsum Properties, LLC. Gypsum wallboard compositions are disclosed which contain functionalized styrene butadiene latex polymers. Methods for the use of the compositions in the manufacture of wallboard panels and sheets is presented.

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Modification of Gypsum Products (Part II): The Effect of ...

2017-10-11  Microwave Drying Method of Gyp-sum Products: The microwave oven used in this study was (Panasonic NN-MX 36 WF, Japan). All samples (40 with and without additives) dried by this method were placed in the microwave oven after two hours from the start point of mixing. Modification of Gypsum Products (Part II): The Effect of Drying Methods on The

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Preparation of Calcium Sulfate Whisker by Atmospheric ...

Preparation of calcium sulfate whisker by atmospheric acidification method from flue gas desulfurization gypsum Hongjuan Sun a,b *, Daoyong Tan a , Tongjiang Peng a,b , Yaqin Liang a,b

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