Extraction of Valuable Metals From Spent Hydrodesulfurization Catalyst By Two Stage Leaching Method

Wadood T. Mohammed; Nada S. Ahmedzeki; Mariam F. AbdulNabi

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Publication Date

Fri Dec 30 2011

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Volume

12

Issue Number

4

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Extraction of Valuable Metals From Spent Hydrodesulfurization Catalyst By Two Stage Leaching Method

spent HDS catalyst

sodium carbonate

sulfuric acid

leaching

valuable metals

Wadood T. Mohammed

Nada S. Ahmedzeki

Mariam F. AbdulNabi

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Spent hydrodesulfurization (Co-Mo/γ-Al2O3) catalyst generally contains valuable metals like molybdenum (Mo), cobalt (Co), aluminium (Al) on a supporting material, such as γ-Al2O3. In the present study, a two stages alkali/acid leaching process was conducted to study leaching of cobalt, molybdenum and aluminium from Co-Mo/γ-Al2O3 catalyst. The acid leaching of spent catalyst, previously treated by alkali solution to remove molybdenum, yielded a solution rich in cobalt and aluminium.

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Publication Date

Sun Dec 01 2002

Journal Name

Iraqi Journal Of Physics

Preparation of thin films of SiCN from gas-phase reaction induced by TEA-CO2 laser and study of their optical properties

laser

Magda Ali

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In this paper, silicon carbonitried thin films were prepared by the method of photolysis of the silane (SiH4) and ethylene (C2H4) gases, with and without ammonia gas (NH3), which is represented by the ratio between the (PNH3) and (PSiH4 + PC2H4 + PNH3), (which assign by the letter X), X has the values (0, 0.13, 0.33). This method carried out by using TEA-CO2 laser, on glass substrate at (375 oC), deposition rate (0.416-0.833) nm/pulse thin film thickness of (500-1000) nm. The optical properties of the films were studied by using Absorbance and Transmittance spectrums in wavelength range of (400-1100) nm, the results showed that the electronic transitions is indirect and the energy gap for the SiCN films increase with increasing of nitrog

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Publication Date

Thu May 01 2025

Journal Name

Process Safety And Environmental Protection

Electromembrane extraction of Cadmium (II) using a novel design of electrochemical cell with a flat sheet supported liquid membrane

Noor R.

Hussain M.

Ali H.

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(5)

(6)

Publication Date

Sun Mar 01 2015

Journal Name

Spectrochimica Acta Part A: Molecular And Biomolecular Spectroscopy

Effect of solvents on the extraction of natural pigments and adsorption onto TiO2 for dye-sensitized solar cell applications

Mahmoud A.M.

Abu Bakar

Abd. Amir H.

Norasikin A.

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(134)

(125)

Publication Date

Sun Feb 05 2023

Journal Name

Engineering, Technology & Applied Science Research

Performance Evaluation of Emulsion Liquid Membrane on Chlorpyrifos Pesticide Removal: Stability, Mass Transfer Coefficient, and Extraction Efficiency Studies

Farrah Emad

Ahmed A.

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Emulsion Liquid Membrane (ELM) is an emerging technology that removes contaminants from water and industrial wastewater. This study investigated the stability and extraction efficiency of ELM for the removal of Chlorpyrifos Pesticide (CP) from wastewater. The stability was studied in terms of emulsion breakage. The proposed ELM included n-hexane as a diluent, span-80 as a surfactant, and hydrochloric acid (HCl) as a stripping agent. Parameters such as mixing speed, aqueous feed solution pH, internal-to-organic membrane volume ratio, and external-to-emulsion volume ratio were investigated. A minimum emulsion breakage of 0.66% coupled with a maximum chlorpyrifos extraction and stripping efficiency were achieved at 96.1% and 95.7% at b

(7)

Publication Date

Mon May 01 2017

Journal Name

Desalination And Water Treatment

Cadmium removal from simulated chloride wastewater using a novel flow-by fixed bed electrochemical reactor: Taguchi approach

Abbas H.

Sawsan A.M.

Ali H.

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(10)

(7)

Publication Date

Fri Dec 30 2022

Journal Name

Journal Of The College Of Education For Women

Mechanisms of Including the Skills of 21st Century in the Educational Competencies of the Basic Education Stage: Kingdom of Bahrain as an Example

Mechanisms

Educational competencies

basic education stage

21st century skills

Nouf Al-Moray

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The study aims to set an image to the mechanisms of the skills of the 21st century in the educational competencies of the basic education stage. To achieve this aim, a qualitative research design has been adopted in its analytical content analysis way. The study has arrived to the following conclusions: the availability of: the communicative and team work skills with a percentage of 25.9%, linguistic competency with a percentage of 24.6%, the skills of local and global citizenship, creativity, and problem solving with a percentage of 13.6%, critical thinking with a percentage of 10.38%, technological culture with a percentage of 5.8%, pioneerism and initiativeness with a percentage of 10.38%, technological culture with a percentage of

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Publication Date

Fri Nov 20 2020

Journal Name

Solid State Technology

Building A Psychological Flow Scale In The Rhythmic Gymnastics Lesson For Third-Stage Students Of The College Of Physical Education And Sciences

Nuha

Mohameed

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In this study, the two researchers try to identify the degree of psychological flow among third-stage students in the College of Physical Education and Sports Sciences / University of Baghdad, by constructing a psychometric flow meter for third-stage students in the College of Physical Education and Sports Sciences / University of Baghdad, and the research sample reached 123 female students They represent 100% of the research community, and after conducting the scientific foundations for building the scale, the two researchers reached the final version of the psychometric flow scale with 21 items with four axes.

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Publication Date

Tue Nov 09 2021

Journal Name

Journal Of Accounting And Financial Studies ( Jafs )

Financial technology as one of the recovery strategies of the Iraqi banking sector in the post-Covid-19 stage: An exploratory study

digital transformation

financial technology

recovery from COVID-19 in banking

أ.د. ابتهاج اسماعيل

أ.د. فيحاء عبد الله

م. م. زينب جمعه

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The research aims to employ one of the most important strategies for recovery from the crisis of the Covid-19 pandemic, which ravaged the economies of the entire world and its various sectors, including the banking sector, through financial technology that is based on digital transformation to achieve financial sustainability and the creation of innovative financial value chains in light of the decline in the banking sector as a result of The negative effects of the Covid-19 pandemic, be guided by the relevant international accounting standards to control the risks associated with financial technology. To recover from the Covid-19 crisis, the research came out with a set of recommendations, most notably financial technology from

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Publication Date

Fri Sep 15 2023

Journal Name

Journal Of Baghdad College Of Dentistry

FEM: Mono-implant cement retained crown with two different adhesive materials

FEA

mono-Implant

cement

adhesive

all-ceramic

stress

deformation

Shahad M

Saja A

Raad S

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Background: The finite element method (FEM) is expected to be one of the most effective computational tools for measuring the stress on implant-supported restorations. This study was designed using the 3D-FEM to evaluate the effect of two adhesive luting types of cement on the occlusal stress and deformation of a hybrid crown cemented to a mono-implant. Materials and Method: The mono-screw STL file was imported into the CAD/CAM system library from a database supported by De-Tech Implant Technology. This was to assist in the accurate reproduction of details and design of a simulated implant abutment. Virtually, a digital crown was designed to be cemented on an abutment screw. A minimum occlusal thickness of 1mm and marginal fitting of 1.2

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(2)

Publication Date

Mon Jan 01 2024

Journal Name

Anais Da Academia Brasileira De Ciências

Morphological study for Accipitrid birds (Accipitridforms, Accipitridae) in Iraq; part two

A part two of Accipitridae Family members that belong to three genera: Circus

Gyps

and Neophron were documented as morphometrics

distribution ranges

and conservation status were reviewed and comprehensively discussed. A total of 29 voucher specimens belong to six species which are conserved in the “Iraq Natural History Research Center and Museum INHM” as follow: Marsh Harrier Circus aeruginosus (Linnaeus

1758)

Hen Harrier Circus cyaneus (Linnaeus

1766)

Montagus Harrier Circus pygargus (Linnaeus

1758)

Pallid Harrier Circus macrourus (Gmelin

1770)

Egyptian vulture Neophron percnopterus (Linnaeus

1758)

and Griffon vulture Gyps fulfus (Hablitz

1783). The results revealed significant criteria about near threatened NT species IUCN and Birdlife International listed as Pallid Harrier Circus macrourus

and Endangered (EN) species as Egyptian vulture Neophron percnopterus globally decreasing population trend.

HIND D.

KHALIDA I.

AFKAR M.

SUHAD Y.

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