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| Знайдено в інших БД: | Реферативна база даних (2) |
Список видань за алфавітом назв: Авторський покажчик Покажчик назв публікацій  |
Пошуковий запит: (<.>A=Bouabdallah S$<.>) | |||
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Загальна кількість знайдених документів : 3 Представлено документи з 1 до 3 |
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| 1. | 
Bouabdallah S. Iron removal process for high-purity silica production by leaching and magnetic separation technique [Електронний ресурс] / S. Bouabdallah, M. Bounouala, A. Idres, A. Chaib // Науковий вісник Національного гірничого університету. - 2015. - № 5. - С. 47-52. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2015_5_10 Purpose. The preliminary study of El-Aouana (Algeria) sandstone quality improvement aimed to obtain high-purity silica sands without iron oxides to meet the standards of glass manufacturing. Methodology. The sandstone from El-Aouana deposit was crushed and sieved. The mineral was characterized by X-ray diffraction and chemically analyzed by X-ray fluorescence, and atomic absorption spectrophotometry. The material (-250 + 125 mum) was leached with hydrochloric acid. The study of main parameters of the leaching process in different ranges was realized. Thus, magnetic separation by means of the dry high-intensity magnetic separator was employed. Findings. The leaching allows us to reduce the iron content in quartz sand significantly, while wet sieving removes only the fraction of these contaminating minerals (<< 125 mum). The applicability of magnetic separation requires further study and substantiation. Originality. The originality consists in the utilization of hydrochloric acid as the leaching agent. Various preliminary experiments were conducted to determine the conditions of the main experiment. Practical value. The results obtained by leaching method can satisfy the specifications for glass manufacturing. The sandstone enrichment by magnetic separation is practical and simple at minimum cost, but it is not effective for impurities removal. | ||
| 2. |
Chaib A. New condition for separation of orthoclase from quartz by flotation; case of Ain Barbar quarry (Algeria) [Електронний ресурс] / A. Chaib, M. Bounouala, S. Bouabdallah, A. Benselhoub // Науковий вісник Національного гірничого університету. - 2016. - № 6. - С. 67-74. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2016_6_10 Purpose. The preliminary study of Ain Barbar (Algeria) feldspar quality improvement is aimed to obtain high purity of feldspar (orthoclase) without iron oxides and quartz to meet the standards of glass manufacturing and ceramics. Methodology. The feldspar of Ain Barbar quarry was crushed and sieved. The mineral was characterized y X ray diffraction and chemical analyses with X ray fluorescence. The material (-250 + 45 μm) was washed followed by physico-chemical concentration (magnetic separation and flotation) by new condition. The study of the main parameters of magnetic separation and flotation process in different ranges was realized. Findings. Washing and high intensity magnetic separation (12 Ampere) afford to reduce the iron-bearing impurities up to 0,09 % Fe2O3, and the flotation is the best way for the separation of K-feldspar from quartz by appropriate reagents for this purpose (HBr, amine). This method for beneficiation of feldspar ore (orthoclase) assaying on average, 15,16 % Al2O3 70,40 % SiO2, 0,03 % total iron oxides, 13,51 % K2O and 0,14 % Na2O, provided several types of products which can be used in the ceramic and glass making. The most striking result in this experimental study is the depressive effect of HBr on quartz and activation of the orthoclase, HBr addition controls amine adsorption on k-feldspar through adsorption of Br- ions onto mineral surfaces. The use of HBr in flotation was found to increase the K-feldspar (orthoclase) grade in the concentrate. This study clearly demonstrates an effective separation of feldspar (orthoclase) from quartz. Originality. The originality of this study consists in the use of hydrobromic acid as a new reagent to activate orthoclase and depress the quartz in the flotation process, with a comparison of the obtained results with the use of hydrofluoric acid or hydrobromic acid in orthoclase flotation, showing that the use of hydrobromic acid (800 g/t of HBr) gives a concentration of 90 % orthoclase and 8 % quartz with 13,51 % K2O, while in feed it is 56 % orthoclase and 39 % quartz with a K2O content of 7,78 %. On the other hand, the use of hydrofluoric acid (800 g/t HF) provides a concentrate of 80 % orthoclase and 18 % quartz, with a grade of 9,52 % of K2O in the same conditions. Practical value. The results obtained with magnetic separation followed by the flotation method can be suitable specifications for ceramics and glass. Besides, the use of hydrobromic acid is economical and less threatening for the environment in comparison with the use of hydrofluoric acid. | ||
| 3. | 
Bouabdallah S. Recycling of siliceous by-products to reduce their impacts on the environment [Електронний ресурс] / S. Bouabdallah, A. Chaib, M. Bounouala, N. Dovbash, A. Benselhoub, S. Bellucci // Technology audit and production reserves. - 2023. - № 2(3). - С. 31–36. - Режим доступу: http://nbuv.gov.ua/UJRN/Tatrv_2023_2(3)__8 | ||
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