Method for preparing calcium sulfate whiskers
Existing gypsum fiber technology of preparing is raw material with the plaster of paris, belongs to Mineral Transformation method.The gypsum fiber quality product that the method is produced depends on raw materials for production, and the diameter of whisker depends on the impact of grind size.Product purity and whiteness affect …
Preparation and applications of calcium carbonate whisker with a
Calcium carbonate (CaCO 3) whisker is used as efficient filler in many applications.. CaCO 3 whisker helps to reduce the cost of reinforced composites as compared to other fibers.. Different basic preparation methods for the production of CaCO 3 whisker are discussed.. CaCO 3 whisker is effectively utilized in friction materials and …
Preparation of α-hemihydrate gypsum whiskers from
The production of α-HH whiskers can be achieved using industrial by-product gypsum. Consequently, utilizing PG as the foundational material for generating α-HH whiskers …
Study on performance and function mechanisms of whisker modified …
With increased whisker content, the expanded diameter decreased from 185 mm to 155 mm, which closely coincides with a previous . Conclusion. In conclusion, ACSW and CW were used to improve the performances of FGD gypsum. And the influence of whisker type and dosage on the mechanical properties of the composites were focused on.
Why are fiber reinforcements widely used than whisker
Hi Murali. By default, whisker reinforcements are more expensive than fiber reinforcements. The physical properties of the whisker are closely matched to their theoretical physical properties ...
CN104911688B
The invention belongs to whisker preparing technical field, more particularly to a kind of method that one step hydro thermal method prepares anhydrous calcium sulfate whisker, including step：A, gypsum is placed in water, is configured to the first suspension, add crystal control agent thereto under agitation, form slurry；Wherein, the solid mass ratio …
Preparation, Characterization, and Formation Mechanism of …
Calcium sulfate hemihydrate whiskers were synthesized successfully via one-step hydrothermal crystallization method using phosphogypsum at 130 °C for 240 min with an initial slurry mass fraction of 2.5wt%. The phase compositions, microstructures, thermal properties and molecular structures of asprepared samples were analyzed by …
Calcium sulfate whisker one-step preparation using semi-dry flue …
Calcium sulfate whiskers were prepared under hydrothermal conditions by a one-step method using semi-dry flue gas desulfurization ash with iron ore sintering as the raw material. The effects of temperature, time, speed, and other factors on the calcium sulfate whiskers morphology and growth rule were systematically studied in a high …
Calcium sulfate whisker one-step preparation using semi-dry flue …
Calcium sulfate whiskers (CSWs), single-diameter fibrous sub-nanomaterials, are widely used in reinforcing fillers, friction materials, filters, paint, and …
Resource utilization of flue gas calcium-based desulfurization …
gories: desulfurization gypsum and desulfurization ash. Desulfurization gypsum is mainly produced in the wet desulfurization process, and its main component is calcium sulfate dihydrate. Desulfurization gypsum has the same properties as natural gypsum and can be widely used in building materials, agriculture, material synthesis, soil, and
Materials | Free Full-Text | A Simple and Efficient Method for
A simple and efficient approach for the high-purity CaSO4·2H2O (DH) whiskers and α-CaSO4·0.5H2O (α-HH) whiskers derived from such phosphogypsum (PG) was proposed. The impact of different experimental parameters on supersaturated dissolution–recrystallization and preparation processes of α-CaSO4·0.5H2O was …
Coatings | Free Full-Text | Effect of Polyethylene-Grafted Maleic
Semidry desulfurization and wet desulfurization in a furnace are usually used in the circulating fluidized bed boiler in the power production of thermal power plants, and these two approaches lead to high calcium content in the fly ash and bottom slag of circulating fluidized beds and produce abundant flue-gas desulfurized (FGD) gypsum …
Influence of modified calcium sulfate hemihydrate whisker on the
The effects of the MCSHWs on the properties of different types of gypsum matrices were investigated. The conclusions of this study can be summarized as follows: (1) The calcium alginate produced from C 6 H 9 O 7 Na and gypsum deposited on the surface of CSHWs coarsened the whisker surface, resulting in strong bonding between the …
Mechanical Properties and Microstructure of Calcium Sulfate Whisker
This study aims to investigate the effect of calcium sulfate whisker (CSW) on the properties and microstructure of cement-based composites. Further, nanosilica (NS) was used as a comparison. The results show that the compressive strength and fracture toughness of cement-based composites increased by 10.3% and 10.2%, respectively, …
Research on the physical properties of calcium sulfate whisker …
In this investigation, softwood pulp and bleached wheat straw pulp were used as raw materials, and Calcium Sulfate Whiskers (CSW) were used as fillers. Based on the structural properties and characteristics of CSW, the printing properties of the paper with CSW, such as whiteness, opacity, pH value, uniformity, Z-direction tensile strength and surface …
One-step synthesis of nanoscale anhydrous calcium sulfate …
New methods of anhydrous gypsum whiskers even nano-whiskers had faced many challenges now. In this study, acetic acid and dilute sulfuric acid formed …
Nanomaterials | Free Full-Text | The Generation …
Calcium sulfate whiskers, also known as gypsum whiskers, are loose, needle-like white fibers with an aspect ratio of 30 to 70 and an average length of 30 to 150 microns . There are three types of …
A Feasible Route for Preparation of Calcium Sulfate …
Calcium sulfate whiskers (CSWs) were synthesized using purified flue-gas desulfurization (FGD) gypsum as raw materials using a hydrothermal method, where the filtrate was recycled back to the …
Preparation of gypsum with high purity and whiteness from
Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, whiteness, and application range of PG. This ...
A facile method of transforming FGD gypsum to α …
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 …
Gypsum whisker, its preparation method and application
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, hydrothermal …
Effect of Ammonium Chloride Solution on the Growth of Phosphorus Gypsum
Figure 4 shows that whiskers grew in different ammonium chloride concentrations, which were 0.5, 1.0, 2.0, and 3.0 mol/L ammonium chloride solutions, respectively. The whisker growth was needle shaped and it can be seen that the growth of the whisker in the 1 mol/L ammonium chloride solution was noticeable with length 355 …
CN2639318Y
The plaster whisker reaction still is a particular device for plaster whisker production. By constant heat source putting in and putting out, the temperature and pressure requirements for material slurry reaction are satisfied. ... gypsum still still body crystal whisker Prior art date Legal status (The legal status is an assumption ...
Study on surface modification of CaSO4 whisker and mechanism …
Based on the mechanism of whisker strengthening cement, this study used ethyl orthosilicate (TEOS) to modify CaSO 4 whisker (CSW) to improve the mechanical properties of cement matrix. The designed structure and morphology of modified CaSO 4 whisker (MCSW) were characterized by means of FTIR, SEM, XRD, contact angle and …
Influence of modified calcium sulfate hemihydrate whisker on the
Calcium sulfate whiskers (CSWs) are columnar crystalline synthetic microfibers with excellent heat resistance, high elastic modulus, and good processability [20], [21].CSWs not only offer the advantages of a fiber and inorganic filler, but also have the same chemical composition as that of the gypsum matrix, which results in good …
China Caso4 Whisker Manufacturer, Gypsum Whisker, …
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 …
Overview of conversion steps of corn grain to lactic acid.
Such technique realized the high-value utilization of industrial by-product gypsum, guided the HHG whisker preparation via the green and convenient method and reduced the environmental hazards. View
Structural characteristic and formation mechanism of hemihydrate
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).
CN102212884A
The industrial residue gypsum is that what to be generated by chemical reaction in the industrial production is the industrial by-products of main component with calcium sulfate.In the production process of the plain chemical fertilizer of phosphorus and compound manure, various additives, can produce in the process of desulfurated plaster that …
Calcium Sulfate Hemihydrate Whiskers Obtained from Flue Gas …
Abstract: As a recycled material, flue gas desulfurization gypsum has been used to prepare calcium sulfate hemihydrate whisker (CSHW) through hydrothermal synthesis for several decades. However, the subsequent utilization of this resultant material has not yet received considerable attention. In the present research, CSHW was successfully synthesized at …