The gypsum whisker dry method transformation method is simplified in production process and equipment, single in heat source, high in efficiency, and low in energy consumption, a transformed product is uniform in crystalline form, high in the ratio of length to diameter, high in crystal strength, and good in toughness.
Semantic Scholar extracted view of "Calcium sulfate whisker prepared by flue gas desulfurization gypsum: A physical–chemical coupling production process" by Jing Gao et al.
The present invention relates to a gypsum whisker. It is a needle alpha-type hemi-hydrated gypsum crystal, its diameter is 2-4 micrometers and its length-to-diameter ratio is 50-100. Its production method uses natural or chemical dihydrated gypsum as raw material, and its process includes the following steps: grinding, preparing slurry material, …
A facile method to transform flue gas desulfurization gypsum (FGD gypsum) to α- calcium sulfate hemihydrate (α-HH) whiskers with high aspect ratios mediated by …
The main aim was to prepare CSH whiskers directly from FGD gypsum, without any purification, using the optimized conditions. This is a facile potential alternative process for large-scale production of CSH whiskers using abundant FGD gypsum as source materials.
In this paper, the solid waste desulfurization gypsum produced by coal-fired power plants was used as raw material to prepare calcium sulfate whiskers with high application prospects.
The solubility characteristics of FGD gypsum and the crystal morphology of whiskers are affected by the anions under the effect of Cu 2+. The effect of anions is stronger than that of Cu 2+, and the adsorption state of Cu 2+ on whisker surfaces is affected by anions (Wang et al., 2020).
In order to obtain hydrophobic whisker for preparing polymeric composite product, the calcium sulfate whisker (CSW) prepared from flue gas desulfurization (FGD) gypsum by hydrothermal synthesis ...
The crystal structure of the FGD gypsum matrix composites was detected using an X-ray powder diffractometer (Bruker D8) in the range of 5°–70° with a scan rate of 10°/min. A scanning electron microscope (QUANTA FEG450) was used to study the crystal morphology and whisker-gypsum interface transition zone of the FGD gypsum matrix …
Li et al. (2017) used desulfurized gypsum as a raw material to investigate the effects of reaction time, temperature, crystal type control agent, sulfuric acid concentration, and other conditions in a sulfuric acid-inorganic salt-water system on whisker nucleation, whisker morphology, and growth process.
This study provided a theoretical basis for the preparation of hemihydrate gypsum whisker and selection of additives and is conducive to phosphogypsum resource utilisation and industrial production of high-value …
Although the preparation of calcium sulfate whiskers using salt gypsum is a valuable concept, the use of untreated salt gypsum—which contains numerous impurity ions (such as Na +, Mg 2+, and K +)—has a considerable impact on the morphologies of the resulting calcium sulfate whiskers, leading to unstable whisker quality [5]. It is therefore ...
The best whisker aspect ratio of phosphogypsum was preferred in 1ýmol/L NH4Cl solution, in which the solubility achieved 6.434ýmg/mL and the aspect ratio reached 69.29. Besides, NH4Cl was found to have a modified effect on gypsum whiskers growth and it can be used to get mesh or dendritic whiskers.
Download Citation | On Jun 1, 2023, Wei Wang and others published Facile preparation of α-calcium sulfate hemihydrate whisker from by-product gypsum in chloride-free salt solution system | Find ...
A facile method to transform flue gas desulfurization gypsum (FGD gypsum) to α- calcium sulfate hemihydrate (α-HH) whiskers with high aspect ratios mediated by cetyltrimethylammonium bromide ...
LAG is the ideal raw material to replace natural gypsum to produce hemihydrate gypsum (HHG) whiskers, realizing the high-value utilization of industrial by …
Fiber gypsum board production process and equipment are characterized in that desulphurization gypsum of a power plant or other natural gypsum is crushed and then placed into a still kettle, a proper amount of crystal modifier is added into the still kettle to realize high-temperature and high-pressure digestion, gypsum liquid slurry alpha is …
The synthesis of hemihydrate gypsum (α-HH) crystals with a low aspect ratio is of great significance to practical production for the effective utilization of flue gas desulfurization (FGD) gypsum.
Alcohol–water solution-mediated transformation of gypsum into α-hemihydrate (α-HH) whiskers provides a green alternative for the high-value-added recycling of flue gas desulfurization (FGD) gypsum. …
Calcium sulfate whiskers (CSWs) were synthesized using purified flue-gas desulfurization (FGD) gypsum as raw materials using a hydrothermal method, where the …
The influence of cement, amount of water/solid (W/S) ratio, water-reducing agent, citric acid content and the hydration age on the gypsum blocks was investigated. The results showed that the optimum W/S ratio, cement content and water-reducing agent are 0.9, 10% and 2 wt% for the calcined gypsum from titanium gypsum, respectively.
Alcohol–water solution-mediated transformation of gypsum into α-hemihydrate (α-HH) whiskers provides a green alternative for the high-value-added recycling of flue gas desulfurization (FGD) gypsum. However, the role of non-lattice cations during the transformation is still unclear. We report an evolution from "boosting–retarding" to …
Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6,10], has …
Gypsum processing description from its geology mineral property to how to extract mineral from rock and placer deposit, related processing plant flow chart and layout design.
The synthesis of FGD gypsum-based material, especially the production of calcium sulfate hemihydrate whisker (CSHW), must be improved to further widen the application value of FGD gypsum and achieve the target resource utilization.
Gypsum whisker preparation is an effective utilization way where the preparation and production can be combined in one process [4, 5]. At present, there have been some research reports on the use of gypsum in the preparation of whisker.
Semantic Scholar extracted view of "Influence of modified calcium sulfate hemihydrate whisker on the physical, mechanical, and microscopic properties of gypsum matrix composites" by Duoming Wang et al.
Alcohol–water solution-mediated transformation of gypsum into α-hemihydrate (α-HH) whiskers provides a green alternative for the high-value-added recycling of flue gas desulfurization (FGD) gypsum. However, the role of non-lattice ...
China Caso4 Whisker Supplier, Gypsum Whisker, Magnesium Salt Whisker Manufacturers/ Suppliers - Shanghai Covio Industry Limited ... Industrial Equipment & Components; Instruments & Meters; Light Industry & Daily Use ... we set up a plant which had 500 tons CaSO4 Whisker integration with testing and R& D. In the expanding …
Semantic Scholar extracted view of "Facile preparation of α-calcium sulfate hemihydrate whisker from by-product gypsum in chloride-free salt solution system" by Wen Wang et al.
In order to obtain hydrophobic whisker for preparing polymeric composite product, the calcium sulfate whisker (CSW) prepared from flue gas desulfurization (FGD) gypsum by hydrothermal synthesis was modified by various surfactants, and the effects of some modification conditions on the hydrophobic property of CSW were …
Liu et al used FGDG as raw material for developing calcium sulfate whiskers. FGD gypsum was milled at various durations to adjust particle sizes. Brunauer-Emmett-Teller analysis and laser particle sizing determined sample characteristics. For CSW synthesis, FGD gypsum slurry was heated and agitated in a high-pressure reactor at …
A Feasible Route for Preparation of Calcium Sulfate Whiskers from FGD Gypsum via Filtrate Recycle under Hydro-Thermal Conditions. Article.
In this thesis, proper amount of whiskers were added to building gypsum used as the basic materials. The gypsum board properties, such as densities and flexural strength etc., were influenced by various whisker content. The results showed that the flexural performance of gypsum board could be enhanced when adding calcium sulfate whisker from a range …
In this paper, calcium sulfate whisker (CSW) was synthesized from flue gas desulfurization (FGD) gypsum using atmospheric acidification method. The in…
This paper reviews the current beneficial applications of titanium gypsum, analyses the practical applications of titanium gypsum in three fields: extraction of useful material, construction material, and soil amendment, and the impact of these applications on the environment, in order to provide a basis for better understanding and application ...
Semantic Scholar extracted view of "Calcium sulfate whisker one-step preparation using semi-dry flue gas desulfurization ash and directional growth control" by Di Zhou et al.
Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was investigated.
In order to obtain hydrophobic whisker for preparing polymeric composite product, the calcium sulfate whisker (CSW) prepared from flue gas desulfurization (FGD) gypsum by hydrothermal synthesis was modified by various surfactants, and the effects of some modification conditions on the hydrophobic property of CSW were …
Key words: crystal /; whisker /; control /; gypsum /; resource; Abstract: At present, the global reserves of gypsum resources are abundant, but the development utilization rate is still in a low level.Especially for the large production and inherent stockpiles of desulfurized gypsum and phosphogypsum, and most of the waste gypsum poses a threat to surface …
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