Phase transition and dissolution behavior of Ca/Mg-bearing silicates of steel slag in acidic solutions for integration with carbon sequestration

2022 ◽  
Author(s):  
Xiaohui Mei ◽  
Qing Zhao ◽  
Yi Min ◽  
Chengjun Liu ◽  
Henrik Saxén ◽  
...  
Keyword(s):  
Phase Transition ◽  
Carbon Sequestration ◽  
Steel Slag ◽  
Dissolution Behavior ◽  
Acidic Solutions

scholarly journals A Review on the Effect from Steel Slag on the Growth of Microalgae

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 769
Author(s):  
Qing Yu ◽  
Tian-Ji Liu ◽  
Shuang Cai ◽  
Fu-Ping Wang ◽  
Di Gao ◽  
...  
Keyword(s):  
Developing Countries ◽  
Steel Slag ◽  
Metallurgical Industry ◽  
Utilization Rate ◽  
Dissolution Behavior ◽  
Broad Application ◽  
Acidic Solutions ◽  
Comprehensive Utilization ◽  
Pre Treatment ◽  
Application Prospects

As a by-product from the metallurgical industry, steel slag contains a large amount of metal elements. In many developing countries, the output of steel slag is huge and the comprehensive utilization rate is low, hence the development of a novel application method for steel slag is of great significance to increase its utilization rate to improve the environment. This paper reviewed the dissolution behavior of Fe, P, Ca and silicate of steel slag under seawater and acidic solutions as an application in the cultivation of different microalgae, such as diatoms, spirulina, and chlorella. This review clarifies that proper pre-treatment of steel slag can effectively increase the dissolved elements of steel slag in the solution and provide more nutrients for the growth of microalgae. Microalgae cultivated with steel slag as a nutrient can be used to produce biodiesel which has a very broad application prospects for cleaner production and environmental protection.

scholarly journals Solid Form and Phase Transformation Properties of Fexofenadine Hydrochloride during Wet Granulation Process

Pharmaceutics ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 802
Author(s):  
Suye Li ◽  
Hengqian Wu ◽  
Yanna Zhao ◽  
Ruiyan Zhang ◽  
Zhengping Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Water Content ◽  
Scale Up ◽  
Small Scale ◽  
Dissolution Behavior ◽  
Wet Granulation ◽  
Water Addition ◽  
Granulation Process ◽  
And Performance

The quality control of drug products during manufacturing processes is important, particularly the presence of different polymorphic forms in active pharmaceutical ingredients (APIs) during production, which could affect the performance of the formulated products. The objective of this study was to investigate the phase transformation of fexofenadine hydrochloride (FXD) and its influence on the quality and performance of the drug. Water addition was key controlling factor for the polymorphic conversion from Form I to Form II (hydrate) during the wet granulation process of FXD. Water-induced phase transformation of FXD was studied and quantified with XRD and thermal analysis. When FXD was mixed with water, it rapidly converted to Form II, while the conversion is retarded when FXD is formulated with excipients. In addition, the conversion was totally inhibited when the water content was <15% w/w. The relationship between phase transformation and water content was studied at the small scale, and it was also applicable for the scale-up during wet granulation. The effect of phase transition on the FXD tablet performance was investigated by evaluating granule characterization and dissolution behavior. It was shown that, during the transition, the dissolved FXD acted as a binder to improve the properties of granules, such as density and flowability. However, if the water was over added, it can lead to the incomplete release of the FXD during dissolution. In order to balance the quality attributes and the dissolution of granules, the phase transition of FXD and the water amount added should be controlled during wet granulation.

Solid phase extraction based on the phase transition of poly(N-isopropylacrylamide): the extraction behaviour of lanthanide(iii) ions in highly acidic solutions

2018 ◽  
Vol 3 (1) ◽  
pp. 48-54 ◽  
Author(s):  
Ki Chul Park ◽  
Haruka Tateno ◽  
Takehiko Tsukahara
Keyword(s):  
Phase Transition ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phase Extraction ◽  
Acidic Solutions ◽  
Extraction Behaviour

The extraction of the complex of Ln(iii) ions and CMPO onto the PNIPAAm solid phase formed by phase transition was achieved in highly acidic solutions.

Mechanochemical Processing of Ultrafine Steel Slag Powders

2013 ◽  
Vol 763 ◽  
pp. 211-215 ◽  
Author(s):  
Xiao Yu Li ◽  
Tian Cheng Liu ◽  
Jing Ouyang ◽  
Hua Ming Yang
Keyword(s):  
Phase Transition ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Mechanochemical Processing ◽  
Ultrafine Powders ◽  
X Ray Diffraction ◽  
Mechanical Grinding ◽  
X Ray ◽  
Mineral Phases

Mechanical grinding of steel slag is investigated and characterized using X-ray diffraction and size analyzer. The results indicate that the obtained ultrafine powders contain active mineral phases suitable for ordinary Portland cement (OPC)-Ca(OH)2, 2CaO·SiO2, 2CaO·Fe2O3. We have proved and first pointed out that the steel slag induces phase transition during grinding process and the Blaine specific surface is related to the fineness of powders and the phase transition of Ca(OH)2 in powders system. The ground ultrafine steel slag powders are applied for the high-performance concrete.

Dissolution behavior of MgO–pyrochlore composites in acidic solutions

2009 ◽  
Vol 394 (1) ◽  
pp. 39-45 ◽  
Author(s):  
P. Xu ◽  
K. Holliday ◽  
K.R. Czerwinski ◽  
J.C. Nino
Keyword(s):  
Dissolution Behavior ◽  
Acidic Solutions

scholarly journals Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1801
Author(s):  
Shuo Zhao ◽  
Zushu Li ◽  
Renze Xu ◽  
Darbaz Khasraw ◽  
Gaoyang Song ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Steel Slag ◽  
Laser Scanning Confocal Microscopy ◽  
Dissolution Time ◽  
Dissolution Behavior ◽  
Scanning Confocal Microscopy ◽  
Composite Oxides ◽  
Secondary Refining ◽  
High Temperature Furnace ◽  
Effective Removal

Al2O3, Al2O3·TiN, Al2O3·MgO, and CaO·2Al2O3 are four different types of inclusions in high Al steels. To improve the steel cleanness level, the effective removal of such inclusions during secondary refining is very important, so these inclusions should be removed effectively via inclusion dissolution in the slag. The dissolution behavior of Al2O3, Al2O3·TiN, Al2O3·MgO, and CaO·2Al2O3 in CaO-SiO2-Al2O3-MgO slags, as well as the steel-slag reaction, was investigated using laser scanning confocal microscopy (LSCM) and high-temperature furnace experiments, and thermodynamic calculations for the inclusion in steel were carried out by FactSage 7.1. The results showed that Al2O3·TiN was observed to be completely different from the other oxides. The composite oxides dissolved quickly in the slags, and the dissolution time of the inclusions increased as their melting point increased. SiO2 and B2O3 in the slag were almost completely reacted with [Al] in steel, so the slags without SiO2 showed a positive effect for avoiding the formation of Al2O3 system inclusions and promoting inclusions dissolution as compared with SiO2-rich slags. The steel-slag reaction was also found to influence the inclusion types in steel significantly. Because of the rapid absorption of different inclusions in the slag, it was found that the dissolution time of inclusions mainly depends on the diffusion in the molten slag.

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