Existence Forms of Magnesium Oxide in Steel Slag by Chemical Phase Separation

2010 ◽  
Vol 177 ◽  
pp. 481-484 ◽  
Author(s):  
Zhao Feng Li ◽  
Zong Hui Zhou ◽  
Li Fu Shan
Keyword(s):  
Salicylic Acid ◽  
Phase Separation ◽  
Magnesium Oxide ◽  
Potassium Hydroxide ◽  
Sucrose Solution ◽  
Steel Slag ◽  
Methanol Solution ◽  
Silicate Phase ◽  
Chemical Phase ◽  
Complex Forms

Magnesium oxide solid dissolved in silicate phase, mesophase and RO-phase which are the major constituents of steel slag. The MgO exists in the steel slag with complex forms, which results in the bad soundness of the steel slag. In this paper, the silicate phase and mesophase were separated by salicylic acid methanol solution and potassium hydroxide-sucrose solution respectively and were studied combining with the XRD and SEM. The results show that the silicate phase and mesophase can be fully dissolved, however, the RO phase is not influenced by the two solutions in this process. The content of magnesium oxide existed in different minerals can be detected by chemical analysis. It can be found that the magnesium oxide mainly exists as RO-phase in steel slag, and some of them exist as free state, while only a small quantity of solid dissolve in the silicate phase and mesophase.

Extraction of the RO Phase from Steel Slag

2017 ◽  
Vol 898 ◽  
pp. 2470-2475 ◽  
Author(s):  
Su Ping Cui ◽  
Xue Li Wang ◽  
Jian Feng Wang ◽  
Hui Liu
Keyword(s):  
Salicylic Acid ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Steel Slag ◽  
Converter Steel ◽  
Dissolution Time ◽  
Chemical Components ◽  
Silicate Phase ◽  
Dissolution Temperature

Through the XRD and XRF analysis of the converter steel slag, we can identify the chemical components and the mineral phase and ensure the extraction method of RO phase from steel slag. The possibility of the extraction of silicate phase from steel slag with Salicylic acid ethanol (SAE) solution was studied firstly. Then, the effect of dissolution temperature of steel slag, dissolution time of the samples, concentration of salicylic acid and specific surface area of steel slag on the extraction mass of silicate phase were analyzed by orthogonal experiment, and the optimum experiment conditions of the extraction of silicate phase from steel slag with SAE solution were concluded. Finally, the RO phase was obtained by the extraction and separation of the intermediate phase from steel slag using potassium hydroxide-sucrose (KOSH) solution. The effect of extraction was determined by detecting the chemical and mineral composition of the extracted residue with XRD and XRF. The results show that the SAE solution can be used to extract the silicate phase from steel slag and the best extraction conditions were 40 degrees of dissolution temperature, 3 h of solution time, salicylic acid concentration 0.2 g/ml and the specific surface area of steel slag 600 m2/kg. Then the intermediate phases (mainly C2F) from steel slag were extracted by KOSH solution, which can get a relatively pure RO phase. The experiment provides a basis for further exploring the cause of the difference in activity of RO phase and improving the utilization ratio of steel slag.

scholarly journals Comparison of the Cerumenolytic Activities of New and Currently Used Agents

2021 ◽  
pp. 014556132098606
Author(s):  
Nguyen Quynh Anh ◽  
Pawin Numthavaj ◽  
Thongchai Bhongmakapat
Keyword(s):  
Salicylic Acid ◽  
Sodium Bicarbonate ◽  
Potassium Hydroxide ◽  
Glycolic Acid ◽  
Statistical Significance ◽  
In Vitro Study ◽  
Distilled Water ◽  
Moderate Amount ◽  
All Solutions

Objectives: This study compared the cerumen dissolution activities of 7.5% sodium bicarbonate, 5% potassium hydroxide, 10% lactic acid, 3% salicylic acid, 10% glycolic acid, and distilled water. Methods: An in vitro study was conducted with 36 cerumen samples. The cerumenolytic activities of the 6 agents were assessed by recording the degree of cerumen disintegration using digital photography at 15 minutes, 30 minutes, 1 hour, 2 hours, and 12 hours. The undissolved cerumen that remained after 12 hours was removed from the solutions and weighed after drying. Results: Potassium hydroxide showed the fastest cerumenolytic activity, dissolving a moderate amount of cerumen at 30 minutes, while glycolic acid and salicylic acid caused no visible changes in the cerumen samples. Samples treated with potassium hydroxide and sodium bicarbonate exhibited higher degrees of disintegration compared to samples treated with distilled water (odds ratio and 95% CI: 273.237 [0.203-367 470.4] and 1.129 [0.002-850.341], respectively). The greatest reduction in cerumen weight was associated with the use of sodium bicarbonate; however, this result did not reach statistical significance. Conclusions: Among the solutions tested, 5% potassium hydroxide showed the fastest dissolution activity, yielding moderate disintegration within only 30 minutes. In terms of residual cerumen weight within 12 hours, all solutions exhibited equivalent effectiveness in the disintegration of cerumen.

scholarly journals New Mixed Ligand Cobalt(II), Nickel(II) and Copper(II) Complexes of 2,2'-Bipyridine-3,3'-Dicarboxylic acid (bpdc) with 2-Mercapto-5-Phenyl-1,3,4-Oxadiazole (phozSH) and Their Antioxidant activity

2020 ◽  
Vol 36 (05) ◽  
pp. 834-842
Author(s):  
Rezan Ali Saleh ◽  
Hikmat Ali Mohammad ◽  
Salim Najm Aldin Saber
Keyword(s):  
Antioxidant Activity ◽  
Metal Ions ◽  
Dicarboxylic Acid ◽  
Potassium Hydroxide ◽  
Electronic Spectroscopy ◽  
Conductivity Measurement ◽  
Mixed Ligand ◽  
Methanol Solution ◽  
Dpph Method ◽  
Colored Complexes

The mixing of one mole of 2,2'-bipyridine-3,3'-dicarboxylic acid (bpdc) with two mole of potassium hydroxide (KOH) in methanol were refluxed for (half hour), followed by addition of one mole methanol solution of MCl2.nH2O (where M=Co, Ni or Cu). The mixture was refluxed for (2 hours) to give colored complexes of the metal ions of [M(bpdc)(H2O)4]. The [M(bpdc)(H2O)4] were reacted with one mole of 2-Mercapto-5-phenyl-1,3,4-oxadiazole (phozSH) producing the colored mixed ligand complexes with general formula [M(bpdc)(phozSH)(H2O)3] in which the metal ions coordinated to the ligand through O-atoms of carboxyl group in (bpdc) and N-atom of (phozSH) ligand. The ligands and complexes are well identified by using Furrier transform infrared spectroscopy, 1H-NMR, 13C-NMR, Electronic spectroscopy, CHNS analysis, Melting point, conductivity measurement. The Antioxidant activity were screened for all the complexes by the use of 2, 2-diphenyl-1-picrylhydrazyl (DPPH) method.

A Comparative study between topical 15% potassium hydroxide and 20% Salicylic acid in treatment of multiple palmoplantar warts

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Wafa Sleman Elmoalef ◽  
Mahira Hamdy Elsayed ◽  
Rania Mahmoud Elhusseiny
Keyword(s):  
Salicylic Acid ◽  
Patient Satisfaction ◽  
Human Papillomavirus ◽  
Side Effects ◽  
Clinical Improvement ◽  
Potassium Hydroxide ◽  
Benign Neoplasms ◽  
Significant Treatment ◽  
Acid Therapy ◽  
Plantar Warts

Abstract Warts are one of the most common benign neoplasms. Warts are induced by over 100 types of human papillomavirus (HPVs) and can affect any race. Various treatments were considered to treat warts, of which topical salicylic acid and KOH are the most commonly used choices. Aim of the study To compare between the efficacy, safety and recurrence rate of topical 15% potassium hydroxide (KOH) and 20% Salicylic acid in the treatment of multiple palm plantar warts. Patients and methods study included 40 patients complaining of multiple palmar and/or planter warts 2 lesions at least. Each patient was treated by: Salicylic acid 20% used on one lesion and topical 15% KOH preparation used on another lesion. Assessment of patients’ response was done through clinical and dermoscopic examination. Results Salicylic acid results revealed that 5% of the treated lesions showed Clinical improvement without dermoscopic clearance, 40% showed Clinical clearance with dermoscopic remnants while 55% showed Clinical and dermoscopic clearance. KOH treated warts showed 5% of the treated lesions had clinical improvement without dermoscopic clearance, 25% showed clinical clearance with dermoscopic remnants while 70% showed clinical and dermoscopic clearance. Conclusion KOH therapy as well as patient satisfaction showed higher significant treatment response compared to salicylic acid therapy with less encountered side effects.

Chemical phase separation in carbon doped YBa2Cu3O6+x: a 63,65Cu NQR study

1997 ◽  
Vol 289 (1-2) ◽  
pp. 77-84 ◽  
Author(s):  
B. Grévin ◽  
Y. Berthier ◽  
I. Monot ◽  
J. Wang ◽  
F. Weiss
Keyword(s):  
Phase Separation ◽  
Carbon Doped ◽  
Chemical Phase
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