محصول

A NOVEL METHOD TO SYNTHESIS OF CALCIUM …

The agitation sulphuric acid leaching method was used at atmospheric conditions to synthesis of CSA powder that was pressed as green body pellets for sintering procedure at a temperature …

Clean and efficient synthesis of LiFePO4 cathode material …

The as-obtained calcium sulfate can be used in many fields, such as pigments in paper coating and adsorbents in environment (Maria et al., 2012, Kumar et al., 2012). ... Synthesis and application of calcium sulphate pigment for paper coating: Potential and prospects. Powder Technol., 218 (2012), pp. 40-45.

Ultrasound-assisted/biosurfactant-templated size-tunable synthesis …

The synthesis was carried out in a 100 ml beaker at a constant rate of 250 rpm.The temperature of the solution was maintained constant at ambient temperature with a deviation of ±0.5 °C by a water bath.The nanosized CaSO 4 were synthesized by a modified in situ deposition technique. Briefly, 11.1 g (0.1 M) CaCl 2 (pH ∼ 6.64) was added into 100 ml double distilled …

Calcium Sulphate Whiskers (CSW) an innovative material for …

Atmospheric and hydrothermal acidification synthesis of CSW. This paper provides a comprehensive review of calcium sulfate whiskers (CSW), focusing on their synthesis …

One-step synthesis of short columnar α-calcium sulfate …

One-step synthesis of short columnar α-calcium sulfate hemihydrate from titanium white waste acid Xiaoxue Hu1, Xunzi Zhang 1, Yiwei Dong 1, Luwei Chen 1, Tingting Yang 1, ChangfengYi 1,2 & Qing ...

Process Synthesis, Design and Techno-Economic …

This work focuses on the design and techno-economic evaluation of an industrial facility for the production of malonic acid. The raw material utilized is commercial glucose syrup with a concentration of 95%. Based on a patent of Lygos, Inc., an innovative biotechnology research company, this study presents a comprehensive synthesis, design, and simulation …

Formation and Morphology of Calcium Sulfate …

Nanosized insoluble metal sulfate aggregates, predominantly CaSO4, have been prepared in a variety of water-in-oil (w/o) microemulsions stabilized by either nonionic or ionic surfactants. Particles were visualized by transmission electron microscopy (TEM) and the identities of the aggregates confirmed by energy-dispersive X-ray analysis (EDXA). BaSO4 …

Shape control synthesis of low-dimensional calcium sulfate

Abstract. Calcium sulfate nanorods, nanowires, nanobelts and sheets had been synthesized via a facile solution reaction of CaCl2 and H2SO4 in mixed solvents of ethanol/N, N …

(PDF) One Pot Synthesis of Calcium Sulfate …

One Pot Synthesis of Calcium Sulfate Hemihydrate from Fishbone-derived Carbon. September 2023; BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS 18(3):398-406; 18(3):398-406;

(PDF) One Pot Synthesis of Calcium Sulfate …

Calcium Sulfate Hemihydrate (CSH) with uniform morphology and high crystallinity were successfully prepared by a precipitation-hydrolysis method in a concentrated sulfuric acid solution...

Synthesis of calcium phosphate/calcium sulphate powder

The typical XRD patterns of the powders synthesized at pH = 4.5 are given in Fig. 11.At 600 °C, the three peaks around 2θ = 29.22 might indicated the appearance of γ-calcium pyrophosphate (γ-CPP). At 800 °C, the peaks of β-TCP and β-CPP were appeared.This supported the analysis of the former part that brushite existed in the as synthesized powders.

Structurally controlled synthesis of calcium sulphate …

All types of gypsum binders are obtained mainly from the natural gypsum and man-made products. As a sustainable analogue of these materials, synthetic gypsum as a product of spent dilute sulphuric acid and calcium carbonate was proposed. We investigated the effect of various technological parameters on the production of calcium sulphate dihydrate particles …

Booklet No. 6 of 8: PRODUCTION OF AMMONIUM …

the form of ground limestone, dolomite or byproduct calcium carbonate from, for example, a nitrophosphate process, to make a product which is known in the indus-try as "Calcium Ammonium Nitrate" (CAN) and then prilled or granulated. Granular products containing ammonium nitrate and either ammonium or calcium sulphate are also manufactured

Structurally controlled synthesis of calcium sulphate …

Next, suspension of calcium sulphate dihydrate is added that acts as an agglomerating agent. The suspension, with constant stirring, is aged for 2.5–4 h in order to increase the calcium sulphate dihydrate particles size. After this time, the suspension is filtered, separating calcium sulphate dihydrate from the bittern.

Ultrasonication assisted and surfactant mediated synergistic approach

When equal amounts of CaCl 2 and Na 2 SO 4 solutions were mixed, calcium sulfate hemihydrates could only be synthesized at temperature above 130 °C [52]. In contrast, in this chemical surfactant templating route, the temperature needed for the synthesis of calcium sulfate is much lower (i.e., 30 °C).

Hydrothermal synthesis of calcium sulfoaluminate–belite …

In the absence of calcium sulfate, C 4 A 3 Ŝ reacts with water forming monosulfoaluminate (C 3 A·CŜ·12H; C 4 AŜH 12) (Winnefeld and Lothenbach, 2010). The formations of these two hydrates contribute different strength development with larger contribution from ettringite than from monosulfoaluminate (Kaprálik and Hanic, 1989, Mehta and ...

Synthesis of calcium sulphate as biomaterial

The most optimum processing parameters for pure II-CaSO4 powder formation is calcined at 500 °C, and the FESEM observation shows that increasing calcination temperatures will contribute to the change of morphology of the CaSO4 Powder as well as its particle size due to necking effect. Calcium sulphate (CaSO4), one of biomaterial with high potential for dental …

Reaction Kinetics The Formation of Calcium Sulfate …

In situ synthesis of hydrophobic calcium sulfate hemihydrate whiskers Nan Jiang, Chao Zhang, Caihong Xue et al.-Micro-environment regulation synthesis of ... Figure 2 Flow sheet. International Conference on Science and Technology 2019 Journal of …

Synergistic preparation and application in PCU of α-calcium sulfate

The α-calcium sulfate hemihydrate whiskers (α-CSHWs) were first prepared using phosphogypsum (PG) and electrolytic manganese residue (EMR) as raw materials for coating urea, demonstrating ...

Hydrothermal synthesis of calcium sulfate whisker from flue …

Preparing calcium sulfate whisker (CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and …

One-Step Synthesis of Calcium Sulfate Hemihydrate …

synthesis of calcium sulphate flowsheet

Synthesis of calcium sulfate hemihydrate whiskers using. For example, the calcium sulfate whiskers with a diameter of 1.0–3.0 μm, a length of 20–80 μm, and an aspect ratio of 10–50 were prepared from the non-sintered raw material, while calcium sulfate whiskers with a diameter of 0.2–0.8 μm, a length of 30–240 μm, and an aspect ratio of 180–360 were produced from …

Precipitated Calcium carbonate production, synthesis and properties

Tajudeen et al. (2019) have made use of carbide waste to produce laboratory chemicals: calcium chloride, calcium tetra-oxo sulphate (VI) and calcium tri-oxo nitrate (V) salts whose purity almost ...

Synthesis of calcium sulfate hemihydrate whiskers using …

For example, the calcium sulfate whiskers with a diameter of 1.0–3.0 μm, a length of 20–80 μm, and an aspect ratio of 10–50 were prepared from the non-sintered raw material, while calcium sulfate whiskers with a diameter of 0.2–0.8 μm, a length of 30–240 μm, and an aspect ratio of 180–360 were produced from sintered raw material.

Synthesis and characterization of nanocrystalline …

Synthesis and characterization of nanocrystalline calcium sulfate for use in osseous regeneration To cite this article: Young Bum Park et al 2011 Biomed. Mater. 6 055007 View the article online for updates and enhancements. Related content Preclinical safety and efficacy evaluation of BioCaS bioactive calcium sulfate bone cement

Synthesis of high-length calcium sulfate whisker, an ideal …

As a byproduct of the industrial synthesis of phosphoric acid, there was a large quantity of phosphor gypsum (PG) accumulation, which needs enormous storage space and endangers the environment. The preparation of calcium sulfate whisker (CSW) from waste PG could solve the large amounts of PG accumul …

Calcium sulphate composition including an additive

the present invention therefore an object of the invention to provide flow agents for calcium sulfate-based compositions that do not have the disadvantages of the prior art, but have an excellent liquefying effect, while maintaining the processability of the calcium sulfate-based materials for a long time and then quickly allow high strength and in particular early strength of …

Laboratory synthesis, spectroscopic characteristics, and …

Calcium sulfate veins have been found in Gale crater and Endeavour crater as indicators of Martian fluid events. The presence of mixed-cation sulfates has been suggested because a wide variety of sulfates containing different cation elements have been detected in in-situ exploration targets (e.g., soils, drilled materials, calcium sulfate veins, and sandstones).

One-step synthesis of short columnar α-calcium sulfate

A green way including one-step preparation and purification stages of α-calcium sulfate hemihydrate (α-HH) from TWWA and lime mud via a neutralization reaction in the …

Microwave-assisted synthesis of cellulose/zinc-sulfate‑calcium …

In this study, zinc-sulfate-calcium-phosphate (ZSCAP) ceramics was prepared by calcination in the presence of microwave irradiation using precursors ZnSO 4:ZnO:CaO:P 2 O 5 in a ratio of 15:30:30:25 (by weight). The calcined ZSCAP ceramics was mixed with microcrystalline cellulose and it was further heated by microwave radiation for the preparation of cellulose/ZSCAP …

Synthesis of calcium sulphate as biomaterial

The obtained fine biocompatible powders of calcium sulfate both after synthesis and after heat treatment at temperature not above 600 °C can be recommended as a filler for producing unique ...