Separation of silica from bauxite via froth flotation
— This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. …
Implementation of reverse flotation method to reduce …
This paper reports a study that implements reverse flotation method to separate silica from West Kalimantan bauxite ores. The study is aimed to find the good process condition to obtain low-silica bauxite as the feed for the Bayer process. The experiments were carried out in a 1 L of flotation cell tank.
High silica bauxites
High Silica Bauxite Processing High silica bauxites - detailed process review, ... flotation process and removed from the rest of the ore. Unfortunately this liberation does
Leaching Kinetics of Thermally-Activated, High Silica Bauxite
— World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.
An environmentally friendly design for low-grade diasporic-bauxite …
— 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 ...
Kaolinite removal from bauxite by flotation:
— By reverse flotation of the ore, a high-grade bauxite concentrate with A/S ratio 8.54 was obtained, however the Al2O3 recovery remained low at 42.87%. ... It was deduced that the separation of ...
Study on New Desilication Technology of High Silica Bauxite
— : There are abundant diasporic bauxite resource in China. The gravity separation and flotation process are utilized for treating this kind of ore. When the ore grinding fineness is -200 mesh 80%, the qualified bauxite concentrate can be obtained, and it contains Al 2 O 3 71.62%, SiO 2 8.94%, and its Al 2 O 3 recovery rate is 75.43%, A/S …
Flotation techniques for separation of diaspore from bauxite …
High content of silica results in high soda consumption, which limits the use of high-silica bauxite in the production of Bayer alumina. In this work,the main flotation parameters of high silica … Expand. Save. Improved Flotation of Oolitic Hematite Ore Based on a Novel Cationic Collector.
Economic Processing of High Silica Bauxites
High silica bauxites are usually considered to be those with reactive silica contents 1 in excess of ~8% by weight of the bauxite. "Economic processing" is meant to imply production of alumina ...
Reduction of Reactive Silica from Bauxite
— The bauxite from Pará-Brazil is a mixture of minerals where gibbsite (Al(OH)3), kaolinite (Al4[Si4O 10](OH)8), quartz, hematite, goethite, rutile and octahedrite are the most important minerals.
The processing of high silica bauxites
— This paper reports a study that implements reverse flotation method to separate silica from West Kalimantan bauxite ores. The study is aimed to find the good …
THE FLOTATION OF MARGINAL GIBBSITIC BAUXITE …
been on the average of 25% when treated by grinding and desliming but these high grade reserves are being depleted. The utilization of marginal quality bauxite ores has been ... Ore characterization indicates that gibbsite is the major aluminum mineral while kaolinite is the predominant silica gangue mineral. Bench flotation tests using ...
Flotation of low-grade bauxite using organosilicon cationic …
— The effect of pH value on bauxite flotation was studied and the results are shown in Fig. 7. It can be seen from Fig. 7 that increasing the pH value from 7.5 to 11 improves the recovery of the concentrate greatly and the A/S first increases and then decreases. ... The processing of high silica bauxitesâ€"Review of existing and potential ...
Implementation of Reverse Flotation Method to Reduce …
— World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.
Effect of Ultrasonic Pre-Treatment on the Reverse Flotation …
— Cationic reverse flotation of kaolinite from bauxite is an alternative to adequate high silica bauxites to the specifications of the Bayer process. However, the presence of clay minerals influences the slurries rheology decreasing the flotation performance. The objective of this work was to investigate the use of ultrasonic pre …
Effect of Thermal Activation Temperature on Pre-desilication …
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 silica, and low A/S ratio. After thermal activation, the content of alumina and silica had a certain increase, but the A/S ratio of low-grade bauxite only had a little fluctuation.
A review of pretreatment of diasporic bauxite ores by flotation …
— Semantic Scholar extracted view of "A review of pretreatment of diasporic bauxite ores by flotation separation" by B. Gibson et al. ... Synchronous Desulfurization and Desilication of Low-Grade and High-Sulfur Bauxite by a Flotation Process. Chai Wencui ... 2019; The existence of sulfur and silica in bauxite influence the product quality of ...
Effect of Thermal Activation on Phase Transformation and …
— Alumina industry is an important portion of the national economy. However, with the gradual decrease of high-grade bauxite and the increasing demand for aluminum resources, the efficient and comprehensive utilization of low-grade bauxite became more important [1, 2].Due to the low mass ratio of alumina-silica (A/S), low-grade bauxite was …
Experimental Investigation on Desiliconization of Low …
Desiliconization experiments were carried out during the process of one roughing-one cleaning direct flotation in this work using diasporic high-silica bauxite as experimental …
Investigation of Flotation Behaviors of Refractory High-Silica Bauxite
High content of silica results in high soda consumption, which limits the use of high-silica bauxite in the production of Bayer alumina. In this work,the main flotation parameters of high silica bauxite (A/S 5.0) including particle size, pulp pH, collector dosage and dispersant dosage were studied. With an optimal condition of 33% solid density, particle size of -74 …
Extraction of alumina and silica from high-silica …
In this paper, a novel process is proposed to extract Al 2 O 3 and SiO 2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na 2 CO 3 followed by two-step leaching with water and sulfuric …
Separation of silica from bauxite via froth flotation
— Low-grade bauxite resources are abundant in China. However, the high content of silica can not meet the production requirments of alumina. Desiliconization experiments were carried out during the…
Leaching Kinetics of Thermally-Activated, High Silica Bauxite …
— Currently, bauxites with a high amount of reactive silica (about >8 %) and an A/S ratio of less than 6 are currently considered to be uneconomic to treat with the conventional Bayer process . Many approaches have been proposed to upgrade bauxites, for example by screening, flotation, magnetic separation and thermo-chemical methods …
A study of bauxite tailing quality improvement by …
— Reverse flotation has been applied to process high silica bauxite in order to increase the bauxite quality, particularly for Chinese diaspore [4]. ... Figure 4 shows the XRD pattern of (a) concentrate and (b) tailings of batch reverse flotation of washed bauxite tailings. Overall, both of concentrate and tailings contain similar minerals ...
High silica bauxites
Flotation could be used to remove quartz from lateritic bauxites, but in this case the fraction of the reactive silica removed compared to the cost of the treatment
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 too …
Synchronous Desulfurization and Desilication of Low …
and High-Sulfur Bauxite by a Flotation Process Wencui Chai, Guihong Han, Yanfang Huang, Yijun Cao, and Jiongtian Liu Abstract The existence of sulfur and silica in bauxite influence the product quality of Bayer alumina. The synchronous desulfurization and desilication of low-grade and high-sulfur bauxite through reverse flotation processes
Mechanochemical Activation of Bauxite | SpringerLink
— Separation of silica from bauxite via froth flotation. Minerals Enginnering, (2009), v. 22, n° 04, p. 315–318,. Google Scholar P. Smith. The processing of high silica bauxites — Review of existing and potential processes. ... Mechanochemical treatment of high silica bauxite with lime. Minerals Engineering, vol. 15, p.211–214, 2000 ...
Progress in flotation de-silica
— In this work,the main flotation parameters of high silica bauxite (A/S 5.0) including particle size, pulp pH, collector dosage and dispersant dosage were studied. With an optimal condition of 33% ...
Leaching kinetics of thermally-activated, high silica bauxite
Thermal activation of bauxite has been proposed to enable removal of organic carbon and reducing boehmite digestion temperature. However, there is limited published research about how thermally activated bauxite behaves at pre-desilication (<100 °C) conditions. Combining x-ray diffraction and scanning electron microscopy energy dispersive …
A study of bauxite tailing quality improvement by reverse flotation
— These fine particles are believed to have high content of silica which is detrimental to the process. ... to recover alumina content from washed bauxite tailing. The reverse flotation experiments ...
Advances in Beneficiation of Low-Grade Bauxite | SpringerLink
— Aluminum industries use bauxite as the major raw material . Bauxite containing less than 50% Al 2 O 3 is called low-grade bauxite ore, which is generally used for the production of aluminum appliances such as abrasives, ceramics, and refractories . The presence of impurities, including silica, iron oxides, and calcium contribute to the …
A review of pretreatment of diasporic bauxite ores by flotation …
— However, oleic acid collectors are still widely used in bauxite flotation as the most commonly used collectors (Deng et al., 2015;Wang et al., 2017) due to their low cost, high collection capacity ...
Beneficiation of Bauxite Ore Characterized by Low …
Flotation is particularly suitable for diasporic ores with a ... For this study, four low-grade, high-silica-containing bauxite samples were collected from different bauxite mines in Odisha. A petrographic study was carried out to understand the mineral composition of bauxite. The texture of the ore was
Synchronous Desulfurization and Desilication of Low-Grade and High
The existence of sulfur and silica in bauxite influence the product quality of Bayer alumina. The synchronous desulfurization and desilication of low-grade and high-sulfur bauxite through reverse flotation processes were studied using modified starch as depressants in this work. The effects of depressant dosage, modified depressant dosage and collector …