scholarly journals An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 57 ◽  
Author(s):  
Siwei Li ◽  
Jian Pan ◽  
Deqing Zhu ◽  
Zhengqi Guo ◽  
Yue Shi ◽  
...  
Keyword(s):  
Iron Ore ◽  
Sodium Aluminate ◽  
Raw Material ◽  
High Alumina ◽  
Pig Iron ◽  
Alkaline Leaching ◽  
Solid Ratio ◽  
Ore Pellets ◽  
Aluminum Iron ◽  
High Aluminum

In this study, a novel process was established for extraction of Fe and Al from a complex high aluminum iron ore (33.43% Fetotal and 19.09% Al2O3). The main steps in the proposed process included pre-reducing high alumina iron ore and subsequent smelting to produce pig iron and rich-alumina slag, followed by alkaline leaching of the slag to obtain sodium aluminate solution and a clean slag. When smelting the pre-reduced high alumina iron ore pellets at 1625 °C for 30 min with a slag basicity of 0.40, the pig iron yielded 97.08% Fe and extracted 0.13% Al2O3, together with an iron recovery of 94.54%. In addition, more than 68.93% Al2O3 was recovered by leaching the slag, which was achieved by firstly roasted the slag at 900 °C for 2 h and then alkaline leaching at 95 °C for 2 h with a liquid-to-solid ratio of 10 mL/g. In addition, the alkaline leaching slag could potentially be used as raw material for construction purpose, which mainly consisted of SiO2 and CaO.

Reduction of Composite Pellet Containing Indonesia Lateritic Iron Ore as Raw Material for Producing TWDI

2013 ◽  
Vol 281 ◽  
pp. 490-495 ◽  
Author(s):  
Adji Kawigraha ◽  
Johny Wahyuadi Soedarsono ◽  
Sri Harjanto ◽  
Pramusanto
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Raw Material ◽  
Pig Iron ◽  
Blast Furnace Process ◽  
Composite Pellet ◽  
Furnace Process ◽  
Iron Phase ◽  
Reductive Atmosphere ◽  
Reduced Pellets

Blast furnace process is still an important process for producing pig iron. The process needs high grade iron ore and coke. The two materials can not be found easily. In addition blast furnace process needs cooking and sintering plant that produces polluted gases. Utilization of composite pellet for pig iron production can simplify process. The pellet is made of iron ore and coal. In addition the pellet can be made from other iron source and coal. This paper discusses the evolution of phase during reduction of composite pellet containing lateritic iron ore. Fresh iron ore and coal were ground to 140 mesh separately. They were mixed and pelletized. The quantity of coal added was varied from 0 %, 20 % and 29 % of pellet weight. Pellets were heated with 10 °C/minute to 1100 °C, 1200 °C, 1300 °C and 1350 °C in a tube furnace and temperature was held during 10 minutes. Heated pellets were analyzed with XRD equipment. XRD of reduced pellets showed that iron phase change with coal and temperature. Lack of coal during heating results the re-oxidation of iron phases. This process is due to replacement of reductive atmosphere by oxidative atmosphere.

scholarly journals Enhancing the Reduction of High-Aluminum Iron Ore by Synergistic Reducing with High-Manganese Iron Ore

Metals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 15 ◽  
Author(s):  
Xianlin Zhou ◽  
Yanhong Luo ◽  
Tiejun Chen ◽  
Deqing Zhu
Keyword(s):  
Iron Ore ◽  
Reduction Process ◽  
Innovative Technology ◽  
Low Grade ◽  
Manganese Ore ◽  
Iron Ores ◽  
High Manganese ◽  
Aluminum Iron ◽  
High Aluminum

How to utilize low grade complex iron resources is an issue that has attracted much attention due to the continuous and huge consumption of iron ores in China. High-aluminum iron ore is a refractory resource and is difficult to upgrade by separating iron and alumina. An innovative technology involving synergistic reducing and synergistic smelting a high-aluminum iron ore containing 41.92% Fetotal, 13.74% Al2O3, and 13.96% SiO2 with a high-manganese iron ore assaying 9.24% Mntotal is proposed. The synergistic reduction process is presented and its enhancing mechanism is discussed. The results show that the generation of hercynite (FeAl2O4) and fayalite (Fe2SiO4) leads to a low metallization degree of 66.49% of the high-aluminum iron ore. Over 90% of the metallization degree is obtained by synergistic reducing with 60% of the high-manganese iron ore. The mechanism of synergistic reduction can be described as follows: MnO from the high-manganese ore chemically combines with Fe2SiO4 and FeAl2O4 to generate Mn2SiO4, MnAl2O4 and FeO, resulting in higher activity of FeO, which can be reduced to Fe in a CO atmosphere. The main products of the synergistic reduction process consist of Fe, Mn2SiO4, and MnAl2O4.

Non-isothermal reduction characteristics of roasted high alumina iron ore pellets

2017 ◽  
Vol 56 (2) ◽  
pp. 148-155 ◽  
Author(s):  
Zuo Liang Zhang ◽  
Ren Chen ◽  
Ye Sun ◽  
Ya-Dong Zhu ◽  
Xiao-Liang Li ◽  
...  
Keyword(s):  
Iron Ore ◽  
High Alumina ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Isothermal Reduction ◽  
Reduction Characteristics

scholarly journals A POSSIBILITY OF SYNTHESIS OF HIGH-ALUMINA CEMENTS FROM DIFFERENT RAW MATERIALS

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Dragica Lazić ◽  
Dragana Kešelj ◽  
Jelena Penavin Škundrić ◽  
Ljubica Vasiljević ◽  
Janko Mikić
Keyword(s):  
Solid Phase ◽  
Raw Materials ◽  
Xrd Analysis ◽  
Sodium Aluminate ◽  
Raw Material ◽  
Al2o3 Content ◽  
High Alumina ◽  
Aluminate Solution ◽  
Tricalcium Aluminate ◽  
Materials Used

Calcium aluminate cements with high Al2O3 content are synthesized from different raw materials. Raw materials used in the synthesis include: lime, tricalcium aluminate hexahydrate, aluminum hydroxide and sodium aluminate solution. The preparation of raw material mixture for sintering was performed in two ways: the first method of preparation of a raw material mixture was by mixing powdered components (Al(OH)3 and CaO, Al(OH)3 and 3CaO·Al2O3·6H2O), another method included stirring into the liquid phase (NaAlO2, CaO and Al (OH)3) for a certain period of time at the temperature of 90°C, whereby the obtained solid phase was used as raw material for sintering. Chemical and mineralogical analysis (XRD) were performed on the cements obtained in synthesis. Based on chemical analysis it was concluded that the cements obtained were CAC 70 and CAC 80, as the Al2O3 content in these cements ranged from 70 to 75.37% for the first type, while the second type had a range of 77-79%. XRD analysis showed that the dominated minerals in cement CAC 70 were CaO• Al2O3 and CaO • 2Al2O3, and in cement CAC 80, mineral CaO • 2Al2O3, which is consistent with the findings published on these cements.

scholarly journals The transition to the production of non-bentonite highly basic iron ore pellets on a flux bond is a real solution to the complex problems of raw material preparation and the blast furnace process

2019 ◽  
pp. 2-5
Author(s):  
Zh.V. Svyrydenko ◽  
M.V. Yagolnik ◽  
V.M. Zakharchenko
Keyword(s):  
Iron Ore ◽  
Raw Materials ◽  
Bentonite Clay ◽  
Raw Material ◽  
Practical Significance ◽  
Blast Furnaces ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Output Increase ◽  
Technical And Economic Indicators

Purpose. Show the possibility of producing bentonitic iron ore pellets with basicity of 0.6-1.2 on a flux bond. Methodology. Testing the properties of the flux binder in the production of pellets at different stages of technology. Analysis of the properties of the obtained pellets and technical and economic indicators of the operation of the firing conveyor machine during the periods of pellet production using bentonite clay and using a flux bond. Results. The advantages of the flux ligament compared to the bentonite are shown. The characteristics of the experimental pellets are given and the economic efficiency of using this technology is proved (bentonite output, increase in iron content, as well as the productivity of roasting machines up to 10%). The scientific novelty of the work lies in the fact that the formation mechanism and the rate of hydration of the flux bond as well as the time of formation of the colloidal binder solution have been clarified. A method of preparing a binder flux has been developed, which allows taking into account all the features of the raw materials and the existing products in the agglomeration factories. The practical significance lies in the possibility of introducing a technology for the production of pellets on a flux bundle in the conditions of any mining plant, which allows: to get rid of the use of bentonite clay, to increase the productivity of kiln machines, to reduce the consumption of limestone and coke in blast furnaces, to increase the productivity of blast furnaces. Il 3. Tab. 3. Bibliogr .: 3 titles. Keywords: non-bentonitic pellets, flux binder, efficiency.

Effect of Reduced Flux Iron Ore Pellets on Removal of Impurities from Pig Iron During Induction Melting: A New Phenomenon

JOM ◽  
2017 ◽  
Vol 70 (6) ◽  
pp. 977-981 ◽  
Author(s):  
Raj Kumar Dishwar ◽  
Shavi Agrawal ◽  
A. K. Mandal ◽  
G. S. Mahobia ◽  
O. P. Sinha
Keyword(s):  
Iron Ore ◽  
Induction Melting ◽  
Pig Iron ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Removal Of Impurities

scholarly journals Microstructural Characterisation of Archeologic Finds Discovered at the Ironworks in Mădăraș

2019 ◽  
Vol 2 (2) ◽  
pp. 79-86
Author(s):  
Enikő Bitay ◽  
László Márton ◽  
János Talpas
Keyword(s):  
Chemical Composition ◽  
Iron Ore ◽  
Raw Material ◽  
16Th Century ◽  
Pig Iron ◽  
Microstructural Characteristics ◽  
Ground Plan ◽  
Iron Supply ◽  
Eds Analysis ◽  
Microstructural Characterisation

Abstract In the middle of the 16th century the ironworks of Mădăraș was one of the important centres of iron production. During its one and a half century lifespan its output provided a significant part of Transylvania’s iron supply. While it operated it used up the entire raw material extracted in the iron ore mines of the Felcsík basin. This study presents the reconstructed ground-plan of the ironworks, its layout on the shores of the Mădăraș creek, and the chemical composition and microstructure of the samples discovered during exploration of the location by means of XRF analysis, EDS analysis and metallography. The analysis of the pig iron, the steel and the slag although performed on individual samples, still provides a good approach regarding the products of the ironworks, their chemical composition and microstructural characteristics.

Non-isothermal reduction kinetics of roasted high alumina iron ore pellets

2020 ◽  
Vol 117 (5) ◽  
pp. 505
Author(s):  
Zuoliang Zhang ◽  
Ye Sun ◽  
Ren Chen ◽  
Lingling Li ◽  
Biao Tang
Keyword(s):  
Iron Ore ◽  
Kinetic Mechanism ◽  
Reaction Rate Constant ◽  
Isothermal Kinetics ◽  
High Alumina ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Isothermal Reduction ◽  
Co Reduction ◽  
Kinetics Of

Non-isothermal reduction of roasted Guangxi high alumina iron ore pellets with CO and H2 was conducted with NETZSCH STA 409C/CD. Non-isothermal kinetics analysis was carried out and kinetics data were obtained. Compared with the possible common mechanisms function in solid state reaction about the correlation coefficient(r), the optimal equations for CO reduction and H2 reduction were determined. Furthermore, the Arrhenius plots for CO and H2 reduction were clarified when the kinetic mechanism functions were determined. The results show that the activation energy values of CO and H2 reduction are 295.82 kJ ∙ mol−1, and 185.42 kJ ∙ mol−1, respectively. Obviously, when the temperature is higher than 1357 K, the level of the reaction rate constant of H2 reduction higher than that of CO reduction increases sharply, that is the capacity of H2 reduction is better than that of CO reduction in certain conditions.

scholarly journals Material composition and characteristics of bentonite clays used as a binder in the production of iron ore pellets

2020 ◽  
Vol 76 (1) ◽  
pp. 30-40 ◽  
Author(s):  
F. M. Zhuravlev ◽  
E. V. Chuprinov ◽  
V. P. Lyalyuk ◽  
D. A. Kassim ◽  
I. A. Lyakhova
Keyword(s):  
Alkaline Earth ◽  
Iron Ore ◽  
Raw Material ◽  
Chemical Compositions ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Exchange Complex ◽  
Bentonite Clays ◽  
In Cis

In the production of iron ore pellets, binding additives are used, in particular, bentonite clays. At present, instead of alkaline bentonite clays used before, the alkaline-earth bentonite clays modified by soda ash are used, supplied from abroad. There is a whole number of bentonite clays deposits in Russia and Ukraine having reserves of the raw material accounting hundreds of million tons, which are not used in the industry because of absence of planned and proper studies of their applicability for pellets production. The analysis of chemical composition carried out and requirements to rheological characteristics of bentonite clays used in the iron ore pellets production at steel-works of Russia and Ukraine determined. Indicators of swelling and water absorption of mono-ionic forms of bentonite of some deposits in water of various hardness presented. Quality of pellets with bentonites, having different exchange complex when using technical water of various hardness considered. Analysis of mineralogical and chemical compositions, as well as value and content of exchange complex of alkaline-earth bentonite clays of Cherkassk deposition, Ukraine, accomplished. The deposition has the largest reserves of such clays in CIS. It was shown, that clays suitable for pellets production, are located near the earth surface. Comparative analysis of strength indicators of pellets, produced with bentonite application with alkaline and alkaline-earth complexes, carried out. It was shown, that despite the low swelling of alkaline-earth bentonites, the quality of pellets, produced with those bentonites is sometimes a little lower, but under definite conditions does not yield to the quality of pellets with alkaline bentonites at the same their consumption.

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