Upgrading Diasporic Bauxite Ores for Iron and Alumina
A technical route has been proposed to upgrade diasporic bauxite ores for iron and alumina enrichment based on reductive roasting, followed by magnetic separation and alkaline leaching. The thermodynamic analysis revealed that by reductive roasting of the bauxite ore at 980–1100°C, hematite in the ore is transformed to magnetite and …
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Progress in Research and Development of Alumina …
The basis of research and development on new technology and processes for low grade diasporic bauxite in China is still the Bayer process. One way of classifying existing and new technologies and processes for low grade bauxite based alumina production is to divide them into the categories; Pre-process, Mid-process and Post-process. ...
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Iran Removal Studies of Low Grade Diasporic Bauxite by …
In this paper, iron removal studies on high iron diasporic bauxite by thermochemical treatment was investigated for the first time. For this purpose, bauxite samples were …
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Improving Characterization of Low Grade Diasporic Bauxite …
A calcium aluminate (CA) slag of modelled composition, originating from the reductive smelting of Greek bauxite residue (BR) from the Aluminium of Greece facility, was hydrometallurgically treated with a Na2CO3 solution, with a 5% S/L ratio, for Al extraction. 60-minute leaching tests were performed at atmospheric pressure and a temperature …
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The Economical Flexibility for Processing Diasporic Bauxite
In this paper, depending on current diasporic bauxite conditions, the raw material, energy consumption and raw materials & fuel cost are studied for processing different grade diasporic bauxite with different production processes, at same time the raw material, energy consumption and raw materials & fuel cost are discussed at same A/S for ...
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CALCIFICATION
middle-low grade bauxite existing reserves can be acceptable support 20 to 40 years, some unproved reserves can be the 233 supplement in the future [3-4]. How to use the low grade bauxite to produce alumina becomes an urgent problem. Most of the bauxite resources in china are diasporic with Low alumina-silica ratio.
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Investigation of parameters affecting desilication of …
Low grade diasporic bauxite in the Jajarm mine with an A/S (Al 2 O 3 /SiO 2) ratio of 2.3 is not usable in the Bayer process at Jajarm Alumina Complex. Due to the severe …
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New insights into flotation mechanism of diasporic bauxite …
1. Introduction. Bauxite is the main source of aluminum metal, and one of its typical types is diasporic bauxite, of which the valuable mineral is diaspore and the main associated gangues are aluminosilicate minerals such as kaolinite, illite, and pyrophyllite [1].Diasporic bauxite is often of poor quality (the content ratio of alumina and silica is …
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Beneficiation of Aluminum-, Iron-, and Titanium-Bearing
In this study, extraction of aluminum-, iron-, and titanium-bearing constituents from diaspore-type bauxite ores was investigated by stepwise treatment consisting of pre-desilication via alkali-leaching of bauxite ore, extraction of alumina via Bayer process, and recovery of iron from red mud via magnetic separation. The pre …
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The Sintering and Leaching of Low-Grade Diasporic Bauxite …
The A/S ratio of bauxite is 1.99, which belongs to low-grade diasporic bauxite. The composition of main ox ides in the clinkers sintered from both bauxites is listed in Table 2.
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Recovery of Iron from Hematite-Rich Diasporic-Type Bauxite …
A technique has been proposed for recovering iron from hematite-rich diasporic-type bauxite ore in this study. Direct reduction roasting followed by low intensity wet magnetic separation process was carried out. ... Shuhua Ma, Zongguo Wen, et al, "An Environmentally Friendly Design for Low-Grade Diasporic-Bauxite Processing," …
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An environmentally friendly design for low-grade diasporic …
A novel and environmentally friendly design for low-grade diasporic-bauxite processing has been developed. It applies the theory of green design to a fundamental …
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Calcification Transformation of Diasporic Bauxite | JOM
The disposal of red mud, which is a solid waste that is generated during the extraction of alumina from bauxite, is one of major problems faced by the aluminum industry. Alkali in red mud seeping under the soil may pollute land and water. The Northeastern University, China, has proposed a calcification–carbonation method to deal …
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The Hydrochemical Series Process for Low Grade …
The principles of a hydrochemical path for processing low grade diasporic bauxite, laboratory digestion results from processing three low-grade diasporic bauxites, along …
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Discovery and primary study of the lithium content in …
Abstract. Lithium (Li) is a critical metal for global development and modern energy. Emerging sediment hosts, which contain karst-type bauxite deposits, aford a potential …
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Iran Removal Studies of Low Grade Diasporic Bauxite by …
In this paper, iron removal studies on high iron diasporic bauxite by thermochemical treatment was investigated for the first time. For this purpose, bauxite samples were calcined in temperatures between 600 and 1100°C and then leached with hydrochloric acid. Obtained results revealed, in spit of gradual decrease in both iron and aluminum …
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Study on the Occurrence State of Lithium in Low-Grade Diasporic Bauxite
Low-grade diasporic bauxite in central Guizhou Province, China, contains Li that can be exploited and utilized. In this paper, several methods were used to determine the main chemical components in low-grade diasporic bauxite, which were Al2O3, SiO2 and TiO2, and the main minerals were diaspore, boehmite, kaolinite, illite and anatase. …
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A new process for Al2O3 production from low‐grade diasporic bauxite
A new process of Al2O3 production from low-grade diasporic bauxite based on the reactive silica dissolution and stabilization in concentrated NaOH-NaAl(OH)4 solutions is proposed and proved feasible. NaOH and Al2O3 concentrations and leaching temperature were found to be the main factors affecting the leaching process of reactive …
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Flotation techniques for separation of diaspore from bauxite …
The bauxite concentrate with A/S of 9.85 and the recovery of Al 2 O 3 of 70.48% are obtained from the low grade bauxite ore (Al to Si mass ratio of 5.70) at pH …
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Nano-mineralogy and -geochemistry of high-grade diasporic …
DOI: 10.1016/J.OREGEOREV.2016.11.009 Corpus ID: 132032016; Nano-mineralogy and -geochemistry of high-grade diasporic karst-type bauxite from Parnassos-Ghiona mines, Greece @article{Gamaletsos2017NanomineralogyA, title={Nano-mineralogy and -geochemistry of high-grade diasporic karst-type bauxite from Parnassos-Ghiona …
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Improving Characterization of Low Grade Elburz Bauxite …
To increase the proportion of lower grade bauxite in the utilized feed and also the possibility of increasing A/S ratio (Al 2 O 3 to SiO 2 mass ratio) in the plant feed (4.66), some investigations have been carried out on improving A/S ratio of Elburz Bauxite, especially lower grade ones, by gravitational method and flotation. To evaluate heavy …
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Study on the Occurrence State of Lithium in Low-Grade Diasporic Bauxite
Low-grade diasporic bauxite in central Guizhou Province, China, contains Li that can be exploited and utilized. In this paper, several methods were used to determine the main chemical components in low-grade diasporic bauxite, which were Al 2 O 3, SiO 2 and TiO 2, and the main minerals were diaspore, boehmite, kaolinite, illite and anatase.
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A review of pretreatment of diasporic bauxite ores by …
In general, the Al/Si mass ratio for feeding to the Bayer process has to be more than eight (Marino, 2012, Marino et al., 2013). Due to the rapid depletion and limitation of high grade gibbsitic/boehmitic bauxite (Al/Si more than eight), attention has been drawn to the abundant low grade diasporic ores.
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Advances in Beneficiation of Low-Grade Bauxite
low-grade bauxite should be less than 0.5% for the pro-duction of abrasives [1]. Similarly, hematite (Fe 2O 3) content should be as low as 1% for refractory applications. The impurities in the bauxite affect its utilities and lead to an increase in production cost. Additionally, higher concentra-
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Effect of Thermal Activation Temperature on Pre …
variation in the chemical composition of low-grade bauxite under different thermal activation temperatures. It can be seen from Table 1 that the content of alumina and silica were 55.75 and 24.21%, respectively. The A/S ratio of the low-grade bauxite sample was about 2.30, and it was a typical low-grade bauxite with high alumina, high
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Transformation of hematite in diasporic bauxite during reductive Bayer
Trans. Nonferrous Met. Soc. China 27(2017) 2715âˆ'2726 Transformation of hematite in diasporic bauxite during reductive Bayer digestion and recovery of iron Xiao-bin LI, Yi-lin WANG, Qiu-sheng ZHOU, Tian-gui QI, Gui-hua LIU, Zhi-hong PENG, Hong-yang WANG School of Metallurgy and Environment, Central South University, …
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Effect of hydroxamic acid starch on reverse flotation …
It is important to depress diaspore effectively in order to remove silicates from diasporic bauxite. A new water soluble polymer hydroxamic acid starch (HA-starch) was prepared. The effects of the product on the diaspore and kaolinite flotation were investigated and its reactive mechanism was studied by zeta potential measurement and FTIR. The results …
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Nano-mineralogy and -geochemistry of high-grade diasporic …
The Kanirash bauxite deposit belongs to the Iran-Himalayan karst-type bauxite belt, which is situated about 30 km southeast of Mahabad city, northwestern Iran. The bauxite ores are embedded by the ...
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A review of pretreatment of diasporic bauxite ores by …
In this paper, a typical low-grade bauxite in China was taken as the research object, and the thermal activation performance and pre-desiliconization …
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Study on the Occurrence State of Lithium in Low-Grade Diasporic Bauxite
Low-grade diasporic bauxite in central Guizhou Province, China, contains Li that can be exploited and utilized. In this paper, several methods were used to determine the main chemical components ...
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