The Kinetics of the 2Al(l)+AlCl&lt;SUB&gt;3&lt;/SUB&gt;(g)=3AlCl(g) Reaction in the Subhalide Process of Aluminium (Study of Extractive Metallurgy of Aluminium (II))

Kikuchi, Takeaki; Kurosawa, Toshio; Yagihashi, Testuo

doi:10.2320/jinstmet1952.33.3_305

Cited by 5 publications

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“…In the previous reports on the production of crude aluminum alloys, the thermal properties of raw aluminous ores(1) (2) and the fundamental problems of carborespect to the subehloride process, many reports have dealt with the equilibrium (6), reaction rate of aluminum (7) and effects of alloying elements on the subchloride reaction (8). Crude alloys obtained from the reduction of bauxite and colloidal earth have properties different from the artificially-made alloys, and relatively few reports (9) have so far been published on the subchloride process using crude alloys.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Aluminum from Crude Aluminum Alloy by the Subchloride Process

1972

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The extraction of aluminum was carried out by the subchloride process.The source material was the crude aluminum alloy prepared from colloidal earth and bauxite by the use of a 70 kVA electric furnace.The extraction ratio of aluminum increased as the size of alloy particles is smaller and the supply of aluminum trichloride is larger, and reached more than 90%Furthermore, its ratio depended not only on the aluminum content in the alloy but also on the Fe/Si ratio. The reaction ratio of aluminum trichloride decreased with increase in its supply and decrease in temperature, but it increased when the reaction zone was extended.The deposited aluminum contained small amounts of silicon and iron, in which the content of silicon was larger than that of iron. The purity of aluminum was higher than 99.6%. Furthermore, the extracted aluminum was melted and made into a thin plate by rolling.

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Section: Introductionmentioning

confidence: 99%

Extraction of Aluminum from Crude Aluminum Alloy by the Subchloride Process

1972

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“…In subhalide refining, AlCl x is produced from AlCl 3 and low-purity Al, and pure Al is then produced by disproportionation of AlCl x . According to previous reports on subhalide refining, the disproportionation reaction is carried out between 1013 K and 1573 K. [33][34][35][36][37][38][39][40][41][42][43] Figure 2(a) shows the partial gas pressure in the Al-Cl system calculated from the thermochemical data 44) under the conditions that the total pressure of the system is 1 atm and metallic Al exists in the system. Below 1100 K, AlCl 3 and its dimer Al 2 Cl 6 are stable in the gas phase.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

New Method for Production of Solar-Grade Silicon by Subhalide Reduction

2009

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In this study, a new method for producing Si, called ''halidothermic reduction'', was investigated with the purpose of producing solar-grade silicon (SOG-Si); by this method, SiCl 4 was reduced by gaseous subhalide used as the reductant. Si was produced by reacting SiCl 4 with Al subhalides, which were produced by reacting AlCl 3 with metallic Al. Fibrous Si with diameters ranging from submicrons to several tens of micrometers was deposited as a result of halidothermic reduction of SiCl 4 by an Al subchloride (AlCl x ) reductant at 1273 K. The size of Si deposits and the reaction rate were increased by simultaneously supplying AlCl 3 and SiCl 4 vapors to a reaction tube holding Al metal. The impurity level of the obtained Si was found to be lower than the detection limit of X-ray fluorescence. Halidothermic reduction is suitable for producing high-purity Si since all reactants and byproducts exist in the vapor phase. Further, this process has high productivity since the overall reaction is a highly scalable metallothermic reduction reaction.

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“…The experimental apparatus is essentially the same as used in the measurement of the reaction rate between pure aluminum and aluminum trichloride (5), and it consists of a trichloride evaporator, a reaction tube, a trichloride condenser and a vacuum pump.…”

Section: Experimental Apparatusmentioning

confidence: 99%

The Effects of Iron, Silicon, Nickel and Copper on the Reaction of Aluminum Subchloride Process

Kikuchi

1972

Trans. JIM

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The effects of iron, silicon, nickel and copper on the reaction of aluminum subchloride process were investigated by the flow method of aluminum trichloride at reduced pressure and in the temperature range of In all cases, the extraction rate of aluminum decreased with increasing contents of alloying elements, and increased as the temperature and supplying rate of aluminum trichloride were raised. The extraction rate of aluminum could be expressed by the following equation including the activity of aluminum and the partial pressure of aluminum trichloride.The contents of silicon and iron in the deposited aluminum were about 0.2% and 0.05%, respectively, and a minute amounts of copper and nickel transfered to the products.In addition, the experimental results were discussed on the basis of thermodynamic calculation.

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The Kinetics of the 2Al(l)+AlCl<SUB>3</SUB>(g)=3AlCl(g) Reaction in the Subhalide Process of Aluminium (Study of Extractive Metallurgy of Aluminium (II))

Cited by 5 publications

References 0 publications

Extraction of Aluminum from Crude Aluminum Alloy by the Subchloride Process

Extraction of Aluminum from Crude Aluminum Alloy by the Subchloride Process

New Method for Production of Solar-Grade Silicon by Subhalide Reduction

The Effects of Iron, Silicon, Nickel and Copper on the Reaction of Aluminum Subchloride Process

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