The invention belongs to the field of building materials, are related to II type anhydrous gypsum fast hydration exciting agent of one kind and fast hydration method, and exciting agent includes following each substance: activity excitant, dihydrate gypsum crystal seed, aqueous solution.Fast hydration method includes the following steps: Step 1: the …
anhydrous gypsum main body Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active Application number JP2005366427A Other languages
Background technique [0002] In the production process of building gypsum powder, the newly calcined building gypsum powder often contains a certain amount of over-burned type III anhydrous gypsum and under-burned dihydrate gypsum. Type III anhydrous gypsum will be deformed under the action of steam or water. It is quickly …
Method for determining content of type III anhydrous gypsum in building gypsum. ... Currently, the alcohol method used in the detection of type III anhydrite is used by many people. Accepted, but this method takes a long time, and high-concentration alcohol is flammable and explosive, which increases safety hazards, and the samples after ...
Anhydrous gypsum, phosphogypsum technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium sulfate, etc., can solve the problems of high raw material cost, impact on performance, large product fluctuation, etc. The effect of resource utilization, stable performance and stable quality
The invention belongs to the technical field of building materials, and particularly relates to phosphorus II type anhydrous gypsum-based masonry mortar. The masonry mortar comprises phosphorus II type anhydrous gypsum, cement, slag, fly ash, potassium sulfate and water. The phosphorus II type anhydrous gypsum-based masonry mortar of the …
3. type II anhydrous gypsum exhibits high strength, excellent water resistance, che mical corrosion resistance, and toughness. Moreover, its production capacity is significantly h igher than that of
In the building materials, the industrial byproduct gypsum is mainly used in the production of cement retarders, gypsum slats, gypsum bricks, gypsum blocks, etc. …
Gypsum (calcium sulfate dihydrate, Fluka, 99.9% purity) samples were dehydrated at temperatures from 85 up to 800 °C 25 g of substance was weighed in corundum crucibles of 60 ml size and dehydrated in two different furnace types to cover the complete temperature range.The furnaces were calibrated with thermo elements.
The invention relates to a cooling device for an industrial byproduct II type anhydrous gypsum powder production line, which is particularly suitable for primary cooling of high-temperature gypsum. The technical scheme adopted by the invention is as follows: the cooling device comprises a first cooling chamber and a second cooling …
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The prepared phosphorus-based II-type anhydrous gypsum cementing material has the flexural strength of 2-13MPa, the compressive strength of 5-40MPa and the hydration rate of more than or equal to 80 percent. According to the activation method provided by the invention, the phosphogypsum is subjected to calcination, grinding, aging and ...
Anhydrite is an anhydrous calcium sulfate (CaSO4). It is a member of the orthorhombic crystal system, exhibiting three directions of perfect cleavage coincident with the three planes of symmetry. Unexpectedly, it is not isomorphous with its mineral brothers: baryte (barium sulfate) and celestine (strontium sulfate)…
The method comprises the following three steps: for quickly finishing the phase component analysis for the building gypsum, by utilizing the principle that the building gypsum loses the adhered water at 50 plus/minus 5 DEG C, loses all the crystal water above 180 DEG C and can have hydration reaction with water, the anhydrous gypsum in the ...
Anhydrous gypsum (calcium sulfate) has a density of approximately 2.96 grams per cubic centimeter (g/cm³). Hydrated gypsum (CaSO4·2H2O) is less dense due to the presence of water molecules within its structure. ... Karst topography is a unique type of landscape characterized by the dissolution of soluble bedrock, typically limestone, but ...
Gypsum is an evaporite mineral most commonly found in layered sedimentary deposits in association with halite, anhydrite, sulfur, calcite, and dolomite. Gypsum (CaSO 4. 2H 2 O) is very similar to Anhydrite …
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PROBLEM TO BE SOLVED: To improve fluidity of anhydrous gypsum powder obtained by heat treatment of a waste gypsum board, by adding only water or a relatively small amount of cement or the like. SOLUTION: This method for improving fluidity of gypsum powder includes: spraying water of 15 to 30 wt.% to type II anhydrous gypsum powder …
In general, the hemihydrate gypsum produced is often a mixture of hemihydrate gypsum and type III anhydrite. Type III anhydrous gypsum, also known as dehydrated hemihydrate gypsum, has the same crystal phase structure as the original hemihydrate gypsum. Type III anhydrous gypsum will quickly hydrate into …
Gypsum is softer, whereas anhydrite is a hard crystal. The hardness rating of gypsum is about 2, while If we look at its hardness rating of anhydrite, then it is 3.5. The density of gypsum is about 2.33g/cc, whereas the density of anhydrite is 3.2g/cc. Gypsum has a monoclinic structural form, while anhydrite has an orthorhombic structural form.
At this time, the high-dissolution rate gypsum may be hemihydrate gypsum, type III anhydrous gypsum, or anhydrous gypsum with a specific surface area of 8000Blaine or more. Type: Application Filed: August 19, 2009 Publication date: September 8, 2011 ...
The invention provides an anhydrous gypsum self-leveling material, a preparation method and application thereof, wherein the self-leveling material comprises the following components in parts by weight: 4000-6000 parts of type II anhydrous gypsum; 2000-3000 parts of admixture; 2000-3000 parts of aggregate; 3-50 parts of a water reducing agent; …
Type III anhydrous gypsum can quickly absorb moisture in the air and transform into hemihydrate gypsum during the aging process. Because this hemihydrate gypsum is formed twice, compared with the hemihydrate gypsum formed once, it has fewer surface cracks and lower dispersion, and the specific surface area is relatively …
The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was …
Type III anhydrous gypsum is also called dehydrated hemihydrate gypsum, and its crystal phase structure is the same as the original hemihydrate gypsum. Type III anhydrous gypsum will quickly hydrate into hemihydrate gypsum when it encounters moisture in the air. Since this unstable phase inevitably exists in the production of semi …
type anhydrous gypsum slurry thin plate Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number JP14176375A Other languages Japanese (ja) Other versions ...
In general, the hemihydrate gypsum produced is often a mixture of hemihydrate gypsum and type III anhydrite. Type III anhydrous gypsum, also known as dehydrated hemihydrate gypsum, has the …
type anhydrous gypsum production gypsum otu Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number JP14176475A
The invention belongs to the technical field of building materials and relates to industrial solid waste resource utilization, in particular to an excitation modification method of phosphorus II type anhydrous gypsum. The invention takes phosphogypsum as a raw material, and the activity of II-type anhydrous gypsum is excited and modified by …
At calcination temperatures above 350℃, type III anhydrous gypsum transforms into type II anhydrous gypsum or natural anhydrite characterized by dense and stable crystalline phase with potential ...
With natural anhydrite (type II anhydrous gypsum) from Hanshan Country of Anhui Province as major raw materials, the preparation and application of anhydrous plaster gypsum are investigated. The ...
Figure 3 illustrates the conversion conditions for these three types of anhydrous gypsum. When the temperature of PG calcination exceeds 200℃, type III anhydrous gypsum is initially formed ...
The invention belongs to the technical field of building materials, and particularly relates to a phosphorus II type anhydrous gypsum-based wall thermal insulation material. The wall heat-insulating material comprises phosphorus II type anhydrous gypsum, water, cement, slag, an activating agent, vitrified micro bubbles, polymer fibers, a waterproof agent and …
A measurement method, anhydrous gypsum technology, applied in the field of building material analysis, can solve problems such as long time required, unfavorable sample recycling, increased safety hazards, etc. ... [0005] To control the content of type III anhydrite in building gypsum, the first thing we need to do is to quantitatively test and ...
