قائمة الطعام
In diasporic bauxite flotation, the minerals involved all contain broken Al–O bonds, although aluminosilicates also contain broken Si–O bonds. The challenge for flotation separation in this type of flotation systems is that the separation has to be based on subtle differences on the fractured surfaces among various minerals.
This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. Tailings from an industrial plant have undergone attrition scrubbing and desliming; the quartz …
A review of pretreatment of diasporic bauxite ores by flotation separation | Semantic Scholar. DOI: 10.1016/J.MINENG.2017.09.009. Corpus ID: 103558055. A …
Abstract. Effective desulfurization of high-sulfur bauxite is one of the major problems in the alumina production industry. To overcome this, a novel nanoparticle collector (NC) to improve the ...
The effect of Al3+ in backwater on the flotation of diaspore bauxite was investigated by micro-flotation tests and the underlying mechanisms were investigated by inductively coupled plasma (ICP) measurement, zeta potential measurements, solution chemistry analyses, and synchrotron near edge X-ray absorption fine structure …
In view of the fact that there is direct flotation process as well as reverse flotation process in bauxite separation practice, and the two different flotation methods also have an effect on the minerals separation degree, both direct flotation and reverse flotation were simultaneously investigated in the separation of diaspore and kaolinite …
Bauxite concentrate with an aluminum-to-silicon (A/S) mass ratio of 6.37 and a 77.63wt% recovery rate were achieved via a flow sheet consisting of "fast flotation …
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 …
Although there are few studies about flotation separation of quartz from gypsum, there are a large number of studies about the cationic collectors for quartz including ... Mechanism of reverse flotation desilication for bauxite by quaternary ammonium salt collector. Nonferrous Met., 24 (2014), pp. 2872-2878. View in Scopus …
The open-circuit flotation results also show that a bauxite concentrate with m(Al2O3)/m(SiO2) over 9.3 and Al2O3 recovery over 76% can be obtained from diasporic-bauxite ore.
Under the closed-circuit flotation flowsheet of "one roughing-two cleaning-three scavenging", aluminum concentrate with a yield of 85.91% and sulfur content of 0.56% were obtained using a ...
In addition, PAM could cause the unselective flocculation of diaspore and kaolinite, reducing the separation efficiency of bauxite flotation. Hexametaphosphate was able to improve the performance ...
At last, the closed-circuit flotation separation of bauxite was studied. In this closed circuit experiment, the concentrate grade of Al 2 O 3 is 69.07%; the Al to Si mass ratio is 9.66; and Al 2 O 3 recovery can reach 71.73%. It is confirmed that the combined use of Gemini cationic collector and the starch depressant has the superior separation ...
Therefore, the purpose of flotation separation of diaspore and kaolinite can be realized through the above adjustment. 4. Conclusion. ... The research conclusions of this study reveal the microscopic mechanism of diasporic bauxite flotation from a novel perspective, and provide strong theoretical support for the development of diasporic …
The bauxite Fe O content was reduced from 7.66%. to 4.81-5.03%. In addition, the flotation performance decreased by diminishing the pH from 9.5 to 8.5 or increasing. the pH to 10.5. The milling ...
Fig. 4 indicated that bauxite concentrates with an Al 2 O 3 to SiO 2 mass ratio greater than 10 could be obtained by using DDGS collector under pH 9.5–11, and the flotation recovery of Al 2 O 3 was above 72%. DDGS was further confirmed to be a superior cationic collector for reverse flotation separation of diasporic bauxite.
Packing the medium in the collection zone of a column can improve bauxite flotation performance and enhance the separation of aluminum minerals from silicon …
The major type of bauxite in China is low-grade diasporic bauxite, which is mainly composed of diaspore and kaolinite. Separation of silicate minerals by flotation technology can meet the requirements of Bayer process, but Na +, K + and Cl − deriving from mineral dissolution and entrainment in flotation water will inevitably mix in the …
Effect of Pulp pH. Pulp pH is an important parameter in the flotation of high-sulfur bauxite, which would influence the surface charge and floatability of minerals [].The Effect of pulp pH on the sulfur content in the concentrate and Al 2 O 3 recovery was investigated and shown in Fig. 4.The flotation conditions were fixed as TMBI dosage …
The flotation separation mechanism of DDAA and CTAB were studied by Fourier transform infrared spectroscopy, zeta potential analysis, X-ray photoelectron spectroscopy and adsorption amounts. ... A review of pretreatment of diasporic bauxite ores by flotation separation. Miner. Eng., 114 (2017), pp. 64-73. View PDF View article …
Cell column integration separation technology represents a new approach for the separation of middle-to-low-grade bauxite ore. Keywords: bauxite; separation; …
As a result, the separation efficiency of bauxite flotation was increased. Fig. 10 b presents the flotation recovery of diaspore and kaolinite as a function of hexametaphosphate in presence of 1 mg·L-1 PAM. As can be seen, with an increase in hexametaphosphate concentration, diaspore and kaolinite displayed totally different …
The existence of sulfide minerals (mainly pyrite) limits the use of high-sulfur bauxite in the production of Bayer alumina. In this work, the reverse flotation desulfurization using 2-mercaptobenzimidazole (MBI) as the collector was studied by L 9 (3 4) orthogonal tests.The interaction mechanisms of MBI with pyrite were investigated by …
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 …
A high sulfur content is one of the challenges in the processing of refractory bauxites in China. The high carbon content of bauxite makes it more difficult to deal with. Desulfurization and decarbonization are the critical issues in the efficient exploitation of high-sulfur bauxite resources. An experimental study on the removal of sulfur and …
The results of XRF of flotation products show that increasing of alumina content and decreasing of silica content. The optimum pH range of bauxite flotation using DDA and AERO 3000C as collectors can be achieved at pH 4 – 10. From the results, flotation performance using DDA is better than AERO 3000C because get higher Al 2 O …
Closed-circuit flotation tests showed that reverse flotation de-silicating can be achieved by a new reagent scheme (DTAL, SFL and MIBC) to obtain a bauxite concentrate (A/S > 10, Al2O3 recovery ...
Solution chemistry of flotation separation of diasporic bauxite. H. Yue. Published 2001. Chemistry, Materials Science. The Chinese Journal of Nonferrous Metals. The crystal …
The Al/Si mass ratio of bauxite for feeding the Bayer process has to be more than 8. The Al/Si in diaspore is less than 6 and has to pretreat before feeding to the process. Flotation has been typically used to increase the mass ratio of Al/Si diaspore ores. This study reviewed how different flotation factors can effect on upgrading diaspore.
Bauxite ore can be extracted from ore washing, flotation, magnetic separation, and chemical and physical methods to extract metal aluminum. Among them, flotation is a more commonly used method in bauxite beneficiation process in recent years. Ore washing is a simple and effective method to increase the aluminum-silicon …
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