Customer case aboutbehavior of sio in the leaching process of alumina clinker

behavior of sio in the leaching process of alumina clinker

Behavior of SiO 2 in the leaching process of alumina

2008-10-1  It is essential for alumina production by alkaline process to know the behavior of minerals containing Al and Si in basic solution, and the behavior of SiO 2 in the process of clinker leaching is an important portion. To study the behavior of SiO 2 in the process of high concentration clinker leaching, experiments were carried out in home-made reactors.

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Behavior Of SiO2 in the leaching process of alumina

It is essential for alumina production by alkaline process to know the behavior of minerals containing Al and Si in basic solution, and the behavior of SiO2 in the process of clinker leaching is an...

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Behavior of SiO2 in the leaching process of alumina clinker

Behavior of SiO2 in the leaching process of alumina clinker with high concentration.

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(PDF) Behavior of SiO2 during leaching process of alumina

Bin Chen,Xiaobin Li,Guihua Liu Behavior of SiO2 in the leaching process of alumina clinker with high concentration [期刊论文] 北京科技大学学报(英文版) 2008(05) 10.

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Decomposition Property of γ-2CaO·SiO 2 during Leaching

Although γ-2CaO·SiO 2 is more stable than β-2CaO·SiO 2, it will still be decomposed by sodium carbonate solution during alumina leaching process, and this will cause the occurrence of secondary reaction. The effect of liquid-solid ratio, caustic alkali, and temperature on decomposition property of γ-2CaO·SiO 2 are studied. The secondary reaction mechanism is discussed by XRD analysis.

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The Sintering and Leaching of Low-Grade Diasporic

Both clinkers sintered by the real bauxite and simulated bauxite at 1350 °C when the molar ratio of CaO to Al 2 O 3 decreased to 1.4 were produced, the alumina leaching rates of which reached over 90% in sodium carbonate liquor. The main phases in the clinkers after sintering are 12CaO•7Al 2 O 3, γ-2CaO•SiO 2 and 2CaO•Fe 2 O 3.

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氧化铝熟料溶出过程二次反应的热力学讨论 buct.edu.cn

Abstract: Thermodynamic computations and discussion of some reactions involved in the clinker leaching process are described. The stability of 2CaO·SiO 2 in sodium aluminate liquor, the reactions between calcium silicate and sodium aluminate liquors, the reactions between hydrogarnet and NaOH and Na 2 CO 3,and the hydration of 2CaO·SiO 2 have all been analyzed in thermodynamic terms.

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Efficient separation of alumina and silica in reduction

2019-2-26  traditional roasting−leaching process. On the contrary, the efficient separation of alumina and silica in kaolin can be reached by fully converting kaolinite into insoluble hercynite and soluble free silica, namely quartz solid solution and cristobalite solid solution, during reduction roasting, followed by alkali leaching of the obtained clinker.

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The production of high purity alumina from solid wastes

2014-5-14  NaOH solution was found enough for the leaching process. For the same purpose, the solid to solution ratio of 1:4 was found to be suitable (Table 3). In addition, to avoid time consumption, leaching time for 2 hours was found enough for the leaching process at 100°C (Tables 4, 5). 3.2 Precipitation process

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Artificial neural network prediction of aluminum

2012-10-5  The Bayer process includes the leaching of bauxites in a concentrated so-dium hydroxide (caustic) solution at temperatures ranging from 373 K (100 °C) to 523 K (250 °C), depending on the mineralogical form of the aluminum hyd-roxide in the bauxite. The process

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Behavior of SiO2 in the leaching process of alumina clinker

Behavior of SiO2 in the leaching process of alumina clinker with high concentration. J u n l f n v r i f ce c n e h oo yBe n o r a ie st o in ea dT c n lg i g oU y S i f Vo u e 1 . m be 。.

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(PDF) Behavior of SiO2 during leaching process of alumina

Bin Chen,Xiaobin Li,Guihua Liu Behavior of SiO2 in the leaching process of alumina clinker with high concentration [期刊论文] 北京科技大学学报(英文版) 2008(05) 10.

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Decomposition Property of γ-2CaO·SiO 2 during Leaching

Abstract. γ-2CaO·SiO 2 is one of the main phases of calcium aluminate slag, which is obtained under 1500°C. Although γ-2CaO·SiO 2 is more stable than β-2CaO·SiO 2, it will still be decomposed by sodium carbonate solution during alumina leaching process, and this will cause the occurrence of secondary reaction.The effect of liquid-solid ratio, caustic alkali, and temperature on

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氧化铝熟料溶出过程二次反应的热力学讨论 buct.edu.cn

Abstract: Thermodynamic computations and discussion of some reactions involved in the clinker leaching process are described.The stability of 2CaO·SiO 2 in sodium aluminate liquor, the reactions between calcium silicate and sodium aluminate liquors, the reactions between hydrogarnet and NaOH and Na 2 CO 3, and the hydration of 2CaO·SiO 2 have all been analyzed in thermodynamic terms.

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The Sintering and Leaching of Low-Grade Diasporic

An improved lime-sintering process was developed to produce alumina from low-grade diasporic bauxite in this paper. Both clinkers sintered by the real bauxite and simulated bauxite at 1350 °C when the molar ratio of CaO to Al2O3 decreased to 1.4 were produced, the alumina leaching rates of which reached over 90% in sodium carbonate liquor. The main phases in the clinkers after sintering are

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Efficient separation of alumina and silica in reduction

2019-2-26  leaching process (RRALP). 2 Thermodynamic analysis Although large amounts of alkali leaching results about roasting−leaching process [6,8,18] were published, theoretical analysis of alkali leaching was seldom reported. Besides, the separation of hercynite and free silica in clinker by alkali leaching is not known yet in theory.

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Synthesis and alumina leaching mechanism of calcium

process, but the main phase of the clinker is C4A3S but not 12CaO·7Al2O3, which is consistent with the research of GOODBOY [11]. He found that C4A3S clinker has a good alumina leaching property. It substitutes 12CaO·7Al2O3 as the main phase while the C/A (molar rate between CaO and Al2O3) decreases from 1.71 to 1.33, and a high alumina

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Heavy Metals Leaching Behaviour Assessment of Palm

2018-4-19  526 LEACHING BEHAVIOR ASSESSMENT Leaching behavior of POC was investigated by applying TCLP of USEPA1311, 1992 (Lincoln et al. 2007; Sun et al. 2006). Five grams of POC with particle size less than 9.5 mm (solid sample: solution ratio = 1:20) was added to 100 mL acetic acid at pH of 4.93 ± 0.05 in a covered

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AA35 Comparison of Alumina Production Process from

2020-12-20  digestion efficiency of alumina can reach 86.35 %. Keywords: Low-grade bauxite, Bayer process, Chemical desilication, Wet series process. 1. Introduction A low-grade refractory bauxite, with lower alumina content and higher carbonate and organic carbon content, is difficult for alumina production [1-3]. The exploratory experimental study on

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Artificial neural network prediction of aluminum

2012-10-5  No strong extreme behavior of the variables was detected. Thus, the ob-tained results could be considered as true representatives of the investigated process. The output of the investigated process was the “Al2O3 leaching recovery”, which is presented as Y in the further text, and it refers to the alumina recovery in the digestion process

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Effect of Sodium Carbonate Concentration on Leaching

The effect of sodium carbonate concentration on alumina leaching of low A/S ratio clinkers and SiO2 concentration in leached liquor was studied in this paper. The clinker with the Al2O3/SiO2 mass ratio of 1.0 (the molar ratios of CaO/SiO2 and Na2O/Al2O3 are 2.0 and 1.05) was sintered at 1230°C using AR reagents. The alumina leaching rate and SiO2 concentration in leached liquor increase with

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Synthesis and alumina leaching mechanism of calcium

process, but the main phase of the clinker is C4A3S but not 12CaO·7Al2O3, which is consistent with the research of GOODBOY [11]. He found that C4A3S clinker has a good alumina leaching property. It substitutes 12CaO·7Al2O3 as the main phase while the C/A (molar rate between CaO and Al2O3) decreases from 1.71 to 1.33, and a high alumina

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Heavy Metals Leaching Behaviour Assessment of Palm

2018-4-19  526 LEACHING BEHAVIOR ASSESSMENT Leaching behavior of POC was investigated by applying TCLP of USEPA1311, 1992 (Lincoln et al. 2007; Sun et al. 2006). Five grams of POC with particle size less than 9.5 mm (solid sample: solution ratio = 1:20) was added to 100 mL acetic acid at pH of 4.93 ± 0.05 in a covered

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Chemical Stability and Leaching Behavior of One-Part

The coal fly ash is classified as ASTM class F fly ash or low-calcium fly ash with a total SiO 2, Al 2 O 3, and Fe 2 O 3 of 77.83% (i.e., more than 70% of the total weight according to ASTM C 616-03). The presence of alumina and silica compounds in coal

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Use of Leaching Cake from Refractory Lining of

spent firebrick lining; leaching cake; cement clinker. I. INTRODUCTION The aluminum industry is the largest non-ferrous metallurgy sector. The main industrial method for introducing primary aluminum is electrolysis of alumina-cryolite melts (Hall– Héroult process) [1,

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Extraction of Alumina from Nawan Kaolin by Acid Leaching

ABSTRACT: This paper investigated the production of alumina from Nawan kaolin by acid leaching with sulfuric and hydrochloric acids. Kaolin was calcined at 850°C and was leached with 6 M acid at 90°C, 5M NaOH followed by HCl solutions were added to the leaching liquor, and the precipitated aluminum hydroxide was converted to alumina by calcination at 900°C.

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The production of high purity alumina from solid wastes

2014-5-14  NaOH solution was found enough for the leaching process. For the same purpose, the solid to solution ratio of 1:4 was found to be suitable (Table 3). In addition, to avoid time consumption, leaching time for 2 hours was found enough for the leaching process at 100°C (Tables 4, 5). 3.2 Precipitation process

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Reusing Desulfurization Slag in Cement Clinker

2017-10-6  clinker. The desulfurization slag added can lower the clinkerization temperature and increase the amount of Ca3SiO5 at 1300 C, which may be beneficial to energy conservation in clinker burning. Moreover, reusing desulfurization slag additionally has the potential to reduce the energy needed for clinker

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AA35 Comparison of Alumina Production Process from

2020-12-20  digestion efficiency of alumina can reach 86.35 %. Keywords: Low-grade bauxite, Bayer process, Chemical desilication, Wet series process. 1. Introduction A low-grade refractory bauxite, with lower alumina content and higher carbonate and organic carbon content, is difficult for alumina production [1-3]. The exploratory experimental study on

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Investigation into the question of complex processing of

2020-1-22  Currently, Ural alumina plants operate using a mixture of SUBR and STBR bauxites. In the future they will process only STBR bauxites. Bauxites of the Srednetimanskoe deposit (the STBR bauxite mine) are ore of medium quality; their silicon module is mainly 6–7 units. In connection with this, it is desirable to investigate the behavior of

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