The results of studies on the processing of gibbsite-kaolinite bauxite are presented. The developed technology includes preliminary chemical activation and thermal transformation during enrichment to obtain a concentrate suitable for processing by the Bayer method. As a result of the chemical activation of gibbsite-kaolinite bauxite in a …
Aluminum-silicates such as pyrophyllite, illite, kaolinite and chlorite are impurity minerals in diasporic-bauxite, it being necessary to remove these silicate minerals to improve the mass ratio ...
This paper presents a potential condition to separate kaolinite through flotation when it is present in bauxite ore. This research anticipates a Brazilian industry …
Request PDF | Removal of aluminosilicates from diasporic-bauxite by selective flocculation using sodium polyacrylate | The flocculation of fine diaspore, kaolinite, illite and pyrophyllite and ...
Aluminum-silicates such as pyrophyllite, illite, kaolinite and chlorite are impurity minerals in diasporic-bauxite, it being necessary to remove these silicate …
The most effective way to remove both kaolinite and goethite is by washing, followed by attrition scrubbing and desliming through removal of clay-rich super fines in …
Request PDF | On Nov 11, 2013, A.E.C. Peres and others published Kaolinite removal from bauxite by flotation. | Find, read and cite all the research you need on ResearchGate
Selective flocculation is a new method to solve the problem of China's bauxite de-silication besides flotation and reverse flotation. The method of selective flocculation of bauxite using hydrolyzed polyacrylamide as flocculant was experimented and evaluated. The results of diaspore and kaolinite single mineral settling tests show …
Leaching Kinetics Both bauxite and activated bauxite begin to dissolve upon contact with the alkaline solution (4 M and 8 M NaOH), the main elemental (Si, Al, Ti and Fe) concentrations in the liquor are shown in Fig. 1.The solution silicate dissolution -precipitation pattern is seen Fig. 1a, which is similar to that of pure kaolinite or metakaolin.
The appropriate and economical conditions for removing the impurities were found to be calcining the bauxite at 550 °C, and leaching it with a sulfuric acid solution of 1.2 mol/L, sulfuric acid ...
Bauxite, the principal ore of aluminum is a potential low-cost sorbent for treating heavy metal-contaminated water. We studied the ability of raw bauxite to adsorb Pb 2+, Cu 2+, and Co 2+ ions in natural waters and the dependency of the adsorption efficiency on the metal concentration in water, contact time, the 'type' of bauxite, and …
Significant interest has been demonstrated for the removal of kaolinite from bauxite ore by flotation. The reverse flotation of kaolinite from bauxite ore at low pH with dodecylamine hydrochloride ...
The reactive silica in the bauxite, mainly kaolinite, reacts with the sodium hydroxide to form the sodium metasilicate solution. Once sufficiently supersaturated, the …
Kaolinite (Al 2 Si 2 O 5 (OH) 4) is the major mineral phase in kaolin ores and is often found, as gangue mineral, in bauxite and iron ores. Direct and reverse flotation are normally applied to recover kaolinite from kaolin ores and kaolin-washing tailings as well as to remove kaolinite gangue from bauxite and iron ores [1], [2], [3], [4].
Alumina is produced from bauxite, which contains a mixture of various oxides, such as aluminum (Al), iron (Fe), silicon (Si), and titanium (Ti). Bauxite can also be considered a source of several other valuable metals, such as scandium (Sc), vanadium (V), and gallium (Ga). The composition and mineralogy of alumina determine their …
Over a billion tons of high-sulfur bauxite has not been utilized effectively currently in China, because the pyrite existing in the bauxite poses a range of hazards during the Bayer process. A novel idea was …
This paper presents a potential condition to separate kaolinite through flotation when it is present in bauxite ore. This research anticipates a Brazilian industry requirement, considering the tendency towards the need for aluminosilicates removal from bauxite ores, as has already occurred in China. Kaolinite is the most abundant aluminosilicate, and …
The most effective way to remove both kaolinite and goethite is by washing, followed by attrition scrubbing and desliming through removal of clay-rich super fines in hydro-cyclone. Processing of bauxite for smelter grade alumina is quite sensitive to bauxite recovery and total cost for processing of ore, particularly in wet beneficiation.
A new chemical pre-desilication process of kaolinite in diasporic bauxite in alkali solution at atmospheric pressure was proposed. The dissolution kinetics and mechanism were studied by chemical ...
In Bayer process, kaolinite is also dissolved with the digestion of the alumina hydrate-containing ores in caustic solution, resulting in a large amount of SiO2 entering the solution.
Virtually each bauxite contains more or less amount of clay minerals, mainly kaolinite (Al 2 (OH) 4 (Si 2 O 5) or Al 2 O 3 ·2SiO 2 ·2H 2 O). The kaolinite content in bauxites ranges from 0.1 to 15% with an average [ 5 ] of 4–8%; kaolinite is the …
since the peak related to the mineral kaolinite (2 θ = 14.30) is more intense in CAB when compared with CB. These results are associated with the distribution of the layers in the
This paper presents a potential condition to separate kaolinite through flotation when it is present in bauxite ore. This research anticipates a Brazilian industry require - ment, considering the tendency towards the need for aluminosilicates removal from bauxite ores, as has already occurred in China. Kaolinite is the most abundant alumi-
for Kaolinite Removal from Amazonian Bauxite Allan Suhett Reis, Geraldo Magela Pereira Duarte, Eslyn Neves, Geovan Oliveira, and Thiago Jatobá Abstract Bauxite is the main ore for metallic aluminum production, consisting of aluminum and iron oxides and kaolinite, a clay mineral commonly found in Amazonian bauxites, as the main carrier of ...
Efforts to remove reactive silica from bauxite ore prior to shipment have largely focused on gravitational methods such as washing, screening and the use of hydrocyclones. The …
Aluminum-silicates such as pyrophyllite, illite, kaolinite and chlorite are impurity minerals in diasporic-bauxite, it being necessary to remove these silicate minerals to improve the mass ratio of Al 2 O 3 /SiO 2 of diasporic-bauxite for the Bayer process. A new quaternary ammonium salt (DTAL) has been shown to be efficient in the flotation of …
Bauxite is the main raw material in primary aluminum production and its reactive silica content and mass ratio of Al 2 O 3 to SiO 2 (A/S) has a critical role in the economic viability of Bayer process. As a major source of the reactive silica, clay impurities should be removed from the ore as much as possible by a beneficiation method such as …
Of particular interest is the development of flotation for the removal of kaolinite from low grade bauxite ores. An important result of recent bauxite flotation research was the opening in 2002 of the first bauxite mineral processing plant in China (and in the world) which uses direct flotation to prepare a bauxite concentrate for the …
Bauxite is widely used to produce alumina. There are many bauxite resources with high iron content. These resources could not be processed and utilized efficiently due to the high concentration of iron (Fe). The alkaline leaching process has been proposed to remove iron from these bauxite resources. Therefore, in this study, the …
Semantic Scholar extracted view of "Reverse flotation for removal of silicates from diasporic-bauxite" by Yunfan Wang et al.
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 …
