Flue gas desulfurization FGD gypsum is an inevitable industrial solid waste originated from the process of calcium based wet flue gas desulfurization in thermal power plants and some chemical plants in order to reduce the emission of SO 2 pollution gas [1] [2] In China the total product of FGD gypsum has reached 550 million tons by 2016 [4] and the FGD
This study explored the production of a medium low strength α hemihydrate gypsum α HH from phosphogypsum using an autoclaved method The influence of slurry concentration spreading thickness crystallizing agents slurry pH autoclaving temperature and autoclaving time on the properties of α HH was investigated The energy consumption of
According to the amount of crystalline water gypsum can also be categorised into dihydrate gypsum hemihydrate gypsum and anhydrous gypsum Hemihydrate gypsum can be further classified as alpha gypsum and beta gypsum [26] which are considerably different in physical performance The alpha gypsum is well crystallised and has high strength
Gypsums played a vital role in the building materials and gypsum whiskers were fiber like crystals with small diameters and high aspect ratios which performed lightweight high strength and green The traditional methods of anhydrous gypsum whiskers through high temperature mostly involve high energy consumption and have potential environmental
At 10% anhydrous gypsum addition M5 the flexural strength increases by 45% as compared to control sample Basically the anhydrous gypsum enhances the flexural strength of hardened composite mortar by the formation of sulfoaluminate hydrates during the early ages of hydration Download Download full size image; Fig 6
On the other hand the PG was converted into anhydrous gypsum and hemihydrate gypsum during the calcination process and the The chemical composition of PG was similar to that of natural gypsum; its main component was gypsum dihydrate The strength increase rates of F1 at 28 and 90 days relative to its 7 days strength were 337% and
Natural Gypsum 1 Mineral Planning Factsheet Gypsum Continuous miner Barrow upon Soar Mine Leicestershire This factsheet pro vides an overview of the gypsum sup ply in the UK It is one of a series on economically important minerals that are extracted in Britain and it is primarily intended to inform the land use planning process January
with natural lime that essentially forms according to the same laws as natural Gypsum but in a speeded up process taking only a few hours FGD Gypsum is an important supplement to the supply of natural Gypsum This synthetic Gypsum has a higher purity Gypsum content of 96% than most natural Gypsum 80% This
The compressive strength of one selected mix proportion FG 4550 which contains the highest dosage of FGD gypsum 45 wt % is much the same as those containing the highest dosage of GGBS
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 physical properties and mechanical properties ventilation property and respiratory capability of anhydrous plaster gypsum with different properties are detected by
The high sulfate resistant HSR Class G oil well cement clinker and natural dihydrate gypsum from Shandong Zhongchang Cement Special Plant China were used Hemihydrate gypsum reduces compressive strength at early ages and promotes strength after 28 days Anhydrous gypsum decreases the compressive strength of cement paste
The optimal dosage of anhydrous gypsum was found as 5% by weight of the binder at which bulk density compressive and flexural strengths of mortar were maximum and the total porosity and water
The sustainability of gypsum products during their life cycle is considered A sustainable life cycle includes the energy efficiency of different manufacturing technologies for gypsum products the use of industrial wastes containing calcium sulphate dihydrate as substitutes for natural gypsum and recycling of the wastes from gypsum based construction
This study explored the production of a medium low strength α hemihydrate gypsum α HH from phosphogypsum using an autoclaved method The influence of slurry concentration spreading thickness crystallizing agents slurry pH autoclaving temperature and autoclaving time on the properties of α HH was investigated The energy consumption of
Strength and tensile bonding strength shrinkage rate is reduced by more same as natural gypsum with higher purity and smaller particle size Since desulfurized gypsum contains water it with anhydrous ethanol for hydration perform the following treatments on the sample after 3 days of hydration 1 X ray diffraction XRD sample and
When gypsum is heated at about 150 160 °C it loses approximately three quarters of its water in a partial dehydration process and becomes hemihydrate gypsum CaSO 4 •½H 2 O or calcined gypsum; it is also known as beta gypsum alpha gypsum is made by processing batches of gypsum under elevated pressure Calcined gypsum or beta gypsum is
Natural gypsum is one of the earliest artificial materials used by human beings It is often used in building materials agriculture chemical industry medical treatment and other realms Research indicates that appropriately processed industrial by product gypsum can effectively substitute for natural gypsum [8]
PG is mainly CaSO 4 ·2H 2 O DH and thus its application in the construction industry as a substitute for natural gypsum is considered one of the most promising solutions to solve the solid waste problem [16] [17] However impurities especially phosphate impurities contained in PG seriously restrict the utilization of PG in the field of building materials
Gypsum Gypsum is a mineral that can be found in nature in two different forms namely as anhydrous calcium sulphate CaSO 4 and dehydrated calcium sulphate CaSO 4•2H 2 O A certain amount of water of crystallization is present in the crystals in the second case which distinguishes the two forms [47]
dihydrate gypsum with original chemical composition These phenomena are called dehydration and hydration respectively At room temperature dihydrate gypsum is a stable phase but with the increase of temperature and different external conditions various variants of hemihydrate gypsum and anhydrous gypsum can be obtained
Gypsum CaSO4·2H2O is the most common sulfate mineral on Earth and is also found on Mars It is an evaporitic mineral that predominantly precipitates from brines In addition to its precipitation in natural environments gypsum also forms an undesired scale in many industrial processes that utilize or produce brines Thus better insights into gypsum
Basic properties of blast furnace slag cement mortar and concrete are investigated by adding inorganic activators The result of this research concludes that slag cement mixed with suitable activator agents such as lime gypsum and limestone powder could accelerate the compressive strength and tighten pore structure at early age The addition of activator into
As for the 3 day compressive strengths there exist 30% increase in the compressive strength of E specimen containing a % addition of gypsum 24% increase in compressive strength for F specimen with % of slacked lime addition and 13% increase for G specimen containing % limestone powder addition
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