The Al/Si ratio in bauxite before feeding to the process must be enriched to more than eight by reducing impurities (mainly aluminosilicates). Therefore, diasporic bauxite ores (Al/Si < 6) have to be upgraded by pretreatment methods to meet the required quality for the Bayer process. Flotation separation (direct or reverse) followed by ...
In this paper, the effect of about ten kinds of additives on Bayer digestion of diasporic bauxite has been investigated. The experiment results has showed that mineral additives such as dolomite, chlorite, medicinal stone, magnesite have a great influence upon the alumina extraction efficiency of diasporite and the scaling property of slurry. ...
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 …
Unlike bauxite ores found in other countries, more than 99% of the bauxite ores in China are diasporic-characterized by tough processing demands, high alumina and silica content, and low alumina to silica mass ratios (hereafter referred to as A/S). In 2003 China's bauxite mineral reserves stood at 2.545 Gt (Luo, 2006). Among these ores ...
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 ...
The XRD pattern of the diasporic bauxite is presented in Fig. 1. The aluminum-bearing minerals in the diasporic bauxite were diaspore (63.4 ± 4.0 wt%) and kaolinite. Thermal decomposition behavior of diasporic bauxite. The thermal behavior of diasporic bauxite without Na 2 CO 3 (B/N = 1/0) was analyzed by TGA-DSC, as shown …
1. Introduction. In China, the main type of bauxite resource is diasporic-bauxite in which the principal valuable mineral is diaspore [1].This type of bauxite contains large amounts of clay minerals such as kaolinite, illite, and pyrophyllite [2], which results in high Al 2 O 3 content and SiO 2 content, but a low mass ratio of Al 2 O 3 to SiO 2 (A/S) …
S. Orhon, Prospecting Report on the Alanya—Maşatdağı Bauxite Deposit (Etibank ATGB Bauxite Prospec. Exploration Department, 1978) [in Turkish]. Exploration Department, 1978) [in Turkish]. S. Temur, S. M. M. Karadağ, F. Arık, and A. Öztürk, Geological and Geochemical Study of Maşatdağı Bauxites, Selcuk Univ. Science Foundation ...
Yin Zhonglin et al. "Study Of The Effects Of Mgo Existing In Lime On Bayer Digestion Process Of Disporic Bauxite", Light Metals 1994, 167–171. Google Scholar Yin Zhonglin and Gu Songqing. "The Influence Of Lime Addition Amount On Scaling Rate In Preheating Process Of Diasporic Bauxite Slurry", Light Metals 2001, 139–142
DOI: 10.1016/J.MINENG.2017.09.009 Corpus ID: 103558055; A review of pretreatment of diasporic bauxite ores by flotation separation @article{Gibson2017ARO, title={A review of pretreatment of diasporic bauxite ores by flotation separation}, author={Borbor A.K.K. Gibson and Darius G. Wonyen and Saeed Chehreh Chelgani}, journal={Minerals …
12. Tao Jiang, et al, Desilication from diasporic bauxite by roasting-alkali leaching process (I), The Chinese Journal of Nonferrous Metals, 2000, 10 (4), 534-538. 13. Tao Jiang, et al, Desilication from diasporic bauxite by roasting-alkali leaching process (II), The Chinese Journal of Nonferrous Metals, 2000, 10 (6), 899-903. 14.
The results demonstrate that the aluminum-bearing minerals in diasporic bauxite are diaspore and kaolinite, which are converted into Na 2-x Al 2-x Si x O 4 after calcination with Na 2 CO 3 at 700-1100 °C. ... As the mass ratio of bauxite to Na 2 CO 3 is 1, Na 1.95 Al 1.95 Si 0.05 O 4 is primarily formed at 900-1000 °C, which has excellent ...
1. Introduction. Even though China contains rich bauxite resources, most of them are diasporic - characterized as tough processing, good crystalline state, compact structure and the low mass ratio of Al to Si [[1], [2], [3]].Diasporic bauxite requires greater temperatures and operating pressure, compared to gibbsitic bauxite or boehmitic …
For low grade diasporic bauxite with an Al 2 O 3 to SiO 2 mass ratio below 8, a sintering process (Jiang et al., 2002) or a combination of sintering and Bayer process (Chen and Peng, 1997) can be used. The sintering process is extremely energy-intensive and environmentally unfriendly, incurring a high alumina production cost.
The feasibility of an integrated technological route for stepwise recovery of valuable components from low-quality diasporic bauxite ores was investigated, and the following conclusions were obtained: 1. The pre-desilication results showed that the removal of silica reached 73.92%, and A/S increased to 9.25 under the condition of sodium ...
The principles of a hydrochemical path for processing low grade diasporic bauxite, laboratory digestion results from processing three low-grade diasporic bauxites, along with industrial test results are presented in this article. The reactions of Si-minerals during hydrochemical treatment
This study has systematically explored various effective flotation factors (particle size, surface electrical charge, collectors, de-pressants, dispersants, …
diasporic bauxite, and m (g) is the mass of the ore powder. 3 Thermal decomposition behavior of silicon-rich diasporic bauxite The main phases of aluminum in the silicon-rich diasporic bauxite are kaolinite and diaspore. Both phases decomposed below 750 °C and the phase transformation routes were reported previously. The reactions occur as ...
The 57 Fe Möss spectra of the high-grade diasporic karst-type bauxite are presented in Fig. 4 and the resulting Möss parameters from the best fits of these spectra using the IMSG code (Douvalis et al., 2010) are listed in Table 2. The spectra were analyzed using a combination of two quadrupole split doublets and two magnetically ...
The main mineral of Greek karst-type bauxite is a novel type of Fe-Cr-diaspore. [6] Fe 3 + and [6] Cr 3 + substitute for [6] Al 3 + in the diaspore structure. Anatase & rutile that are detectable in microscale also form mineral nanoparticles.. Apart from Fe 3 + ions in diaspore, iron is also present as Fe oxide nanomineral.. Ore nanogeoscience …
Diasporic bauxites A and B were respectively sourced from Guangxi and Guizhou Provinces. The bauxites were prepared for 24 h in an oven at 100 °C, ground, and then sieved through a 160-mesh screen.Samples were chemically analyzed using inductively coupled plasma spectroscopy (Intrepid II XSP, USA) as shown in Table …
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.
The separation of Al from the silicon-rich diasporic bauxite is of great significance in alumina production. Herein, we proposed a low-temperature ammonium sulfate roasting-water leaching process to extract aluminum from silicon-rich diasporic bauxite. Parameters including roasting temperature, dosage of ammonium sulfate, …
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 ...
DOI: 10.1016/j.ijmst.2021.11.002 Corpus ID: 244079127; Interactions between bubble and particles of key minerals of diasporic bauxite through the extended DLVO theory @article{Zhang2021InteractionsBB, title={Interactions between bubble and particles of key minerals of diasporic bauxite through the extended DLVO theory}, author={Ningning …
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 …
Characterization of the Sulfur-Bearing Diasporic Bauxite. The chemical compositions of low- and high-sulfur diasporic bauxite, Al concentrate and S concentrate are given in Table I. It is seen that the high-sulfur diasporic bauxite contains 54.63% Al 2 O 3, 14.53% Fe 2 O 3, 8.25% SiO 2 and 4.49% S T. Accordingly, the A/S ratio of the …
A new approach was applied to processing high iron diasporic bauxite which involves firstly pre-processing at low temperature with high αK liquor and then digesting at high …
The Al/Si ratio in bauxite before feeding to the process must be enriched to more than eight by reducing impurities (mainly aluminosilicates). Therefore, diasporic …
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 kaolinite …
1.. IntroductionThere are plenty of bauxite resources in China. However, more than 90% of the bauxite in China is of diasporic characteristics with low ratio of aluminum oxide to silica(A/S: 4–6) [1], [2].It cannot satisfy the basic condition (A/S > 8) to produce alumina(Al 2 O 3) through Bayer process [3], [4].Therefore, some complex flow …
The point of A in Fig. 2(a) Table 1 Chemical composition of kaolinite-rich diasporic bauxite (wt.%) Al2O3 SiO2 TiO2 Fe2O3 CaO LOI Others 63.85 12.84 2.93 3.64 0.60 14.14 2.00 Fig. 1 XRD pattern of kaolinite-rich diasporic bauxite Table 2 Mineralogical composition of kaolinite-rich diasporic bauxite (wt.%) Diaspore Kaolinite …
A technical route has been proposed to upgrade diasporic bauxite ores for iron and alumina enrichment based on reductive roasting, followed by magnetic …
The research conclusions of this study reveal the microscopic mechanism of diasporic bauxite flotation from a novel perspective, and provide strong theoretical …
Diasporic bauxite represents one of the major aluminum resources. Its upgrading for further processing involves a separation of diaspore (the valuable mineral) from aluminosilicates (the gangue minerals) such as kaolinite, illite, and pyrophyllite. Flotation is one of the most effective ways to real …
Diasporic bauxite represents one of the major aluminum resources. Its upgrading for further processing involves a separation of diaspore (the valuable mineral) from aluminosilicates (the gangue minerals) such as kaolinite, illite, and pyrophyllite. Flotation is one of the most effective ways to realize the upgrading. Since flotation is a …
With the shortage of bauxite resources and the lower grade of bauxite produced in China, a new alumina production process is being studied and developed to deal with the …
