research centers


Search results: Found 14

Listing 1 - 10 of 14 << page
of 2
>>
Sort by

Article
ALUMINA RECOVERY FROM IRAQI KAOLINITIC CLAY BY HYDROCHLORIC ACID ROUTE

Authors: Suad I. Al-Sindy --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2006 Volume: 2 Issue: 1 Pages: 67-76
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

The extraction and recovery of alumina (Al2O3) from white kaolinite clay in hydrochloric acid solution was investigated on laboratory scale. The extraction rate was found to increase with calcination temperature (up to a certain limit), calcination time and acid concentration. Under optimum conditions of 720oC calcination temperature for 45 min with 28% HCl, by weight and 45 min leaching time at 100oC, alumina extraction was about 99 % .The recovery of alumina by gas (Hydrogen Chloride) precipitation technique has proven satisfactory and it was of about 93%, with purity of about 99.98% Al2O3.This purity of the produced alumina was found in accordance with that of commercial grade, which is in the range of (99 – 99.5)% Al2O3.

Keywords


Article
EFFECT OF SOME ALKALI ADDITIVES ON THE REDUCIBILITY OF AL-HUSSAINIYAT IRON ORE, FROM IRAQI WESTERN DESERT

Authors: Sahar N. Abdullah --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2009 Volume: 5 Issue: 1 Pages: 119-131
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

The reducibility of Al-Hussainiyat pisolitic iron ore with coke and some alkali carbonate additives was investigated. The variable parameters studied are: temperature, time and type and amounts of alkali additives. Initially a precalcined ore of particle size range (–850 +177) micron mixed with coke (–75) micron was reduced in the temperature range (850 – 1000)° C at variable time (60 – 150) minutes. The effect of alkali carbonates (Na2CO3, K2CO3 and CaCO3) on reducibility was next studied at the same temperature conditions above for (150) minutes. Reduction time and the amount of additive in the coke ore mixture was varied (1 – 5) % of the ore weight.The experimental results show that, reduction temperature, reduction time and additive amount substantially influence the reducibility and higher degree of reduction was accordingly yielded. The best results were obtained at 5% additive at 1000°C .The effect of additives was found in the following order: CaCO3 > K2CO3 > Na2CO3.

Keywords


Article
UPGRADING OF MONTMORILLONITE CLAYSTONE (DIGMA FORMATION) FROM WADI BASHIRA, WESTERN DESERT, IRAQ

Authors: Sahar N. Abdullah --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2010 Volume: 6 Issue: 2 Pages: 149-157
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

Wet beneficiation processing of Wadi Bashira Ca-montmorillonite claystone, which belongs to the Digma Formation, has been studied using tetrasodium pyrophosphate as dispersant agent. The claystone is located in the Western Desert of Iraq. It is of a low grade, associated with different amount of clay and non-clay mineral impurities. Calcite (CaCO3) constitutes the major proportion of these impurities. In this study, the effect of different parameters (slurry solid concentration, dispersant amount and dispersant/ slurry mixing times) on the efficiency of the beneficiation process were investigated and followed through the measurement of CaO% values of the upgraded claystone (concentrate). Gravity and centrifugal sedimentation were tested to separate the impurities from the clay suspension. The process variables were optimized and the yielded claystone was evaluated. It was shown that the beneficiation process was very effective in upgrading the montmorillonite claystone and capable of producing a high grade montmorillonite (89% montmorillonite) with CEC of 85 meq/100 gm.

Keywords


Article
BENEFICIATION OF ATTAPULGITE – MONTMORILLONITE CLAYSTONE BY DISPERSION SEDIMENTATION

Authors: Ala`a M.Kh. Mustafa --- Sahar N. Abdullah --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2008 Volume: 4 Issue: 1 Pages: 117-124
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

The beneficiation of attapulgite – montmorillonite claystone has been studied with dispersion sedimentation technique using polyionic salts as dispersant. The study was performed on attapulgite-rich claystone sample from the Digma Formation ¬exposed in the Western Desert of Iraq. The clayey materials mainly consist of attapulgite and montmorillonite minerals, together with quartz, calcite, dolomite and gypsum as impurities. Calcite represents the major impurity associated with the clay. Type and dosage of dispersant (namely sodium hexametaphosphate, and tetrasodium pyrophosphate) and slurry solid concentration were tested to understand their effect on the beneficiated process. The results showed that tetrasodium pyrophosphate was the best for achieving good beneficiation of attapulgite clay from dilute crude slurry.

Keywords


Article
EVALUATION OF SANDS FROM DIBDIBBA FORMATION IN AL-NAJAF PLATEAU, CENTRAL IRAQ, FOR COLORED GLASS MANUFACTURING

Authors: Baha'a A. Sabbar --- Suhair Z. Abdulla --- Nawfal A. Hammodi --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2010 Volume: 6 Issue: 1 Pages: 139-145
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

Silica sand samples collected from Dibdibba Formation in Al-Najaf Plateau (NW Al-Najaf and Al-Kifil areas). Their chemical properties and grain size distribution were studied and evaluated for possible utilization in colored glass manufacturing. The overall results revealed, that the sands are not suitable, and required upgrading to provide them as raw material acceptable for the glass industry. In this work, techniques involving screening and attrition scrubbing have been utilized for this purpose. The results obtained indicated that the sands can be beneficiated to the grade that satisfies the requirements of colored glass industry.

Keywords


Article
BLOATING CHARACTERISTICS OF LOW GRADE Ca-MONTMORILLONITE CLAYSTONE AND THE EFFECT OF SOME ADDITIVES

Authors: Mayada S. Joodi --- Wasan A. Muslim --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2011 Volume: 7 Issue: 2 Pages: 57-67
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

This study was conducted to assess the bloating characteristics of the calcium montmorillonite claystone from Wadi Bashira in the Iraqi Western Desert and indicate the effect of red kaolinitic claystone and feldspathic sand addition. The materials were formed into pellets, (aggregates) after mixing in different wt% combinations. The results of heat treatment of aggregates formed only from montmorillonite claystone indicated that, bloating incidence occurs at a temperature of (1180 – 1200º C). The bloated aggregates obtained exhibit a considerable low bulk density (1.185) g/cm3¬ and low mechanical strength. All aggregates made from the mixtures (montmorillonite claystone, red kaolinitic claystone with, or without feldspathic sand) showed a good to very good bloating. Also the aggregates made of montmorillonite claystone and feldspathic sand (except that made with 5 wt% feldspathic sand) showed a good bloating. The bulk density of the bloated aggregates obtained was appreciably low (0.54 – 0.7 g/cm3) with water absorption value of (4 – 6.8) %. This suggested that these aggregates can probably used, as lightweight materials in civil works.

Keywords


Article
SODIUM ACTIVATION OF IRAQI HIGH GRADE MONTMORILLONITE CLAYSTONE BY DRY METHOD

Authors: Saly N. Mahdi --- Jassim M. Kshash --- Abdul Wahab A. Al-Ajeel
Journal: Iraqi Bulletin of Geology and Mining مجلة الجيولوجيا والتعدين العراقية ISSN: 18114539 Year: 2013 Volume: 9 Issue: 1 Pages: 65-73
Publisher: Ministry of Industry and Minerals وزارة الصناعة والمعادن

Loading...
Loading...
Abstract

High grade calcium montmorillonite claystone (calcium bentonite) sample from Wadi Bashira region, Western Desert, Iraq, was activated with sodium by a dry grinding procedure and subsequently evaluated for use as drilling fluids to conform API specifications. Sodium carbonate (Na2CO3) was used to do the activation and convert calcium bentonite to its sodium form. This ion exchange was demonstrated by X-Ray diffraction patterns, wherein the main Ca-montmorillonite d (001) peak changed from 13.6 Å to 11.7 Å. The rheological properties of the activated sample were highly improved, but the sample failed to fulfill API drilling mud requirements. It was observed that certain additives (organic sodium salt and/ or Na-CMC) when added with Na2CO3 can improve the rheological properties of the activated bentonite sample so as it can be used as a drilling mud. The amounts of these additives and that of Na2CO3 were optimized and a bentonite having all API specifications was produced. Experimental results showed that an amount, not exceeding 1 wt.% of these additives with 6 wt.% Na2CO3 is optimal. Accordingly, it can be claimed that the application of this method is economically viable compared to wet activation as it saves water, energy and time.

نموذج من أطيان الكالسيوم مونتمورلونايت (الكالسيوم بنتونايت) من منطقة وادي بشيرة في الصحراء الغربية للعراق تم تنشيطه بالصوديوم بطريقة الطحن الجاف وتقييمه لأغراض سوائل الحفر وفق مواصفات API. استخدمت مادة كاربونات الصوديوم (Na2CO3) بنجاح لإنجاز التنشيط وتحويل البنتونايت الطبيعي، الذي هو من نوع الكالسيوم الى نوع الصوديوم. تم ملاحظة هذا التبادل الأيوني من مخطط الأشعة السينية الحائدة، حيث تغيرت قيمة القمة الرئيسية للكالسيوم مونتمورلونايت (001)d من Å13.6 الى Å11.7 ولقد كان هناك تحسن كبير في الخواص التيارية للبنتونايت المنشط، إلا أنها لم ترتقي لمواصفات API المطلوبة لحفر الآبار النفطية. ولكن لوحظ أن بعض المضافات مثل أملاح الصوديوم العضوية مع أو بدون Na-CMC عند أضافتها مع Na2CO3 يمكنها تحسين الخواص التيارية للبنتونايت المنشط وبالتالي يمكن استخدامه في أطيان الحفر. وعليه فقد تم تحديد الكميات المثلى والأنسب من هذه المضافات بالإضافة الى Na2CO3 لإنتاج بنتونايت يلبي متطلبات API. وقد بينت نتائج التجارب إن كمية المضافات بنسبة لا تزيد عن 1% وزناً مع 6% وزناً من كاربونات الصوديوم هي أكثر ملائمة لذلك. وبناءاً على ذلك يمكن القول بأن استخدام هذه الطريقة له مردود اقتصادي عالي بالمقارنة مع طريقة التنشيط الرطب، حيث إنها تؤدي الى ادخار الماء والطاقة والزمن.


Article
Beneficiation of Akashat Phosphate Rocks by Flotation Process
تركيز صخور فوسفات عكاشات بطريقة التعويم

Authors: Hijran Z.Toama --- Abdul-Wahab A. Al-Ajeel --- Haitham H. Waheeb
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2015 Volume: 33 Issue: 9 Part (A) Engineering Pages: 2255-2268
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

In this work, reverse froth flotation technique has been adopted to upgrade the Iraqi phosphate ore from Akashat deposit as an alternative method to the existing calcination method. Prior to flotation experiments, a feed flotation was prepared by washing and desliming operations on 300 and 75 µm ASTM sieve opening to eliminate fine materials. In flotation experiments, the effect of the parameters, collector (oleic acid) quantity, phosphate depressor (sodium sulfate) quantity, solid%, pH value of the pulp (using H2SO4) and flotation time were investigated. The experimental results obtained showed that the flotation method applied has managed to beneficiate Akashat phosphate ore to the acceptable level for commercial utilization. The phosphate concentrate obtained under the optimum conditions (1kg/t of oleic acid ,10kg/t of sodium sulfate, 30% solid concentration, 6.5 pH and 3 minutes for flotation time) containing 32% P2O5, 0.5% MgO and CaO/P2O5 ratio less than of 1.6% with a recovery of 93%.

يتناول هذا البحث دراسة إمكانية تركيز خام الفوسفات العراقي من منجم عكاشات في الصحراء الغربية في محافظة الانبار بأستخدام طريقة التعويم الرغوي العكسي كطريقة بديلة عن الطريقة الحرارية (Calcination) المستخدمة حالياً. تمت عمليات الغسل والغربلة الرطبة للخام قبل اجراء تجارب التعويم للحصول على غذاء تعويم ذو مدى حجمي -300+75)) مايكرون وخالي من الدقائق الناعمة.في تجارب التعويم تم دراسة تأثير بعض المتغيرات المهمة على رتبة P2O5 ونسبة الأسترجاع Recovery) ( وهي كمية حامض الاوليك (Oleic Acid) كمجمع للكالسايت ,كمية كبريتات الصوديوم (Sodium Sulfate) كمغطس للفوسفات , كثافة اللباب , قيم درجة الحموضية (pH) وزمن التعويم .أظهرت النتائج التجريبية التي تم الحصول عليها على إمكانية التعويم الرغوي العكسي في رفع تركيز معدن الفوسفات في خام عكاشات الى المستوى المقبول للأستخدام التجاري حيث تم الحصول على ركاز يحتوي ) (32%P2O5,0.5%MgO,CaO/P2O5 1.57% ونسبة إسترجاع 93% في الظروف المثلى للتعويم وهي:(كمية المجمع 1kg/t ,كمية المغطس 10Kg/t,كثافة اللباب 30%,درجة الحموضية 6.5 (pH) وزمن التعويم 3 دقائق )


Article
Studying the Efficiency of Lime-Soda Sinter Process to Extract Alumina from Colored Kaolinite Ores Using Factorial Technique of Design of Experiments

Authors: Hijran Z. Toama --- Abdul-Wahab A. Al-Ajeel --- Ajheen H. Jumaah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 5 Part (A) Engineering Pages: 500-508
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

As the increasing demand for alumina in recent years with the result diminishing reserve of bauxite, the need to secure a domestic raw material base is driving research in new technologies to process low grade ores into alumina, with the intention that these technologies will lead to a significant reduction of bauxite and alumina transportation costs, allow the extraction of more valuable components from the ore and reduce environmental impact. Clays are types of the low-grade aluminum ores, they're also well abundant which make them a potential substitutes for Bauxite. In this work, lime soda sinter process was adopted for extracting alumina from kaolinitic claystone from Al-Ga'ara formation (Duekhla) quarry in western Iraq. The operation efficiency of sintering was studied in which the whole process has been done with three stages: the sintering process for the raw materials, leaching and carbonizing processes to precipitate and separate the alumina from the leach pregnant solution . Factorial technique of Design of Experiments (DOE) module in Minitab was used as a principal methodology to examine the sintering efficiency over alumina extraction. The results obtained showed that the optimum parameters for the sintering operation were CaO/SiO2 molar ratio of 2.2, Na2O/Al2O3 molar ratio of 1.2, sintering temperature at 1213 °C for 90 min. The sintered materials were leached with sodium carbonate solution, and sodium aluminate solution was obtained. By bubbling carbon dioxide gas into this extract solution aluminum hydroxide [Al(OH)3] has been precipitated and on calcination at 1200 °C for 2 hrs, alpha alumina (α-Al2O3) was obtained with purity of 98.5 %.


Article
Beneficiation of Low Grade Calcium Bentonite Claystone

Authors: Hijran Z. Toama --- Abdul-Wahab A. Al-Ajeel --- Ekhlas M. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 5 Part (A) Engineering Pages: 546-554
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

The beneficiation of Ca-bentonite claystone has been studied with dispersion sedimentation technique using polyionic salts as dispersant.The claystone is located in the Western Desert of Iraq. It is of a low grade, associated with different amount of clay and non-clay mineral impurities. Calcite (CaCO3) constitutes the major proportion of these impurities. Various parameters; solid concentration, dispersant amount (e.g. sodium tripolyphosphate, and tetrasodium pyrophosphate), conditioning time, and centrifugal sedimentation speed and time on the efficiency of the beneficiation process were investigated and followed through the measurement of CaO% and cation exchange capacity (CEC) values of the upgraded claystone concentrate. Centrifugal sedimentation were tested to separate the impurities from the clay suspension. Design experiments by Taguchi method, orthogonal array L16, was used for optimizing the different process parameters of the beneficiation process. Experiments were conducted at different solid concentrations (1, 3, 5, 7) wt.%, dispersion agent amount (0.2, 0.4, 0.6, 0.8) wt.%, conditioning time (5, 10, 15, 20) min, centrifugal sedimentation speed (500, 600, 700, 800) rpm, and centrifugal time (5, 10, 15, 20) min. The optimum beneficiation conditions obtained from the experimental work are, 7 wt.% solid concentration, 0.8 wt.% of dispersant, 15 min conditioning time attachment of the dispersant agent with the bentonite slurry, 800 rpm centrifugal speed, for 10 min time. Under studied condition, tetrasodium pyrophosphate showed better output t for achieving good beneficiation of bentonite clay from dilute crude slurry.

Listing 1 - 10 of 14 << page
of 2
>>
Sort by
Narrow your search

Resource type

article (14)


Language

English (14)


Year
From To Submit

2018 (2)

2017 (1)

2015 (1)

2014 (2)

2013 (1)

More...