Method for extracting composite aluminum oxide from coal ashes

A technology for compounding alumina and fly ash, applied in alumina/aluminum hydroxide and other directions, can solve the problems of long alloy production process, difficult large-scale application, long production process, etc., to achieve short production process and reduce total social investment , The effect of simplifying the production process

Inactive Publication Date: 2014-12-03
崔佩霞
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Problems solved by technology

[0121] In view of the problems of long production process, high cost, large amount of waste slag, and difficulty in large-scale application existing in the two major technical methods of extracting alumina from fly ash, and the long production process from alumina→electrolytic aluminu

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  • Method for extracting composite aluminum oxide from coal ashes
  • Method for extracting composite aluminum oxide from coal ashes

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Experimental program
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Effect test

Embodiment approach 1

[0189] Implementation plan 1: Production of ZL101 cast aluminum alloy with general-purpose composite alumina

[0190] Assume that the chemical composition of a certain incoming fly ash after removal of impurities such as soil and uniform particle size is as follows:

[0191] Element SiO 2 Al 2 o 3 Fe 2 o 3 MgO CaO Total other impurities Loss on ignition content% 50 28 6 1 6 2 7

[0192] ZL101 cast aluminum alloy is an aluminum-silicon-based alloy with a relatively large amount. According to the national standard GB / T1173, its main chemical composition

[0193] Requirements are as follows:

[0194] Element Si Mg Fe Al Content average % 6.5～7.5 0.25～0.45 0.5～0.9 the remaining

[0195] According to the calculation of material balance, adding 364.6kg of silicon oxide and 18.2kg of magnesium oxide per ton of fly ash can be formulated into composite alumina for the production of ZL101 aluminum alloy. Th...

Embodiment approach 2

[0218] Implementation Scheme 2: Production of 4043 deformed aluminum alloy with high magnesium composite alumina

[0219] Assume that the chemical composition of a certain incoming fly ash after removal of impurities such as soil and uniform particle size is as follows:

[0220] Element SiO 2 al 2 o 3 Fe 2 o 3 MgO CaO Total other impurities Loss on ignition content% 48 28 6 3 6 2 7

[0221] 4043 wrought aluminum alloy is an aluminum-silicon-based alloy with a relatively large amount. According to the national standard GB / T3190, its main chemical composition requirements are as follows:

[0222] Element Si Mg Fe Al Content average % 4.5～6.0 0.8～1.3 0.8 the remaining

[0223] According to the calculation of material balance, 156.3kg of silicon oxide and 67.7kg of magnesium oxide need to be added per ton of fly ash to make composite alumina for the production of 4043 wrought aluminum alloy. The calcula...

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Abstract

The invention belongs to the fields of production aluminum oxide from coal ashes and metallurgy of aluminum and particularly relates to a method for extracting composite aluminum oxide from the coal ashes. The composite aluminum oxide can be used for producing an aluminum-silicon-based alloy as a partial substitute of a main raw material aluminum oxide of an aluminum electrolysis cell. A main scheme of the invention is as follows: optional constituents such as aluminum oxide (Al2O3) and silicon oxide (SiO2) in the coal ashes are not needed to be extracted respectively, only are the unused constituents in the coal ashes removed; or the oxides of some optional constituents are added into constituents of the to-be-produced aluminum-silicon alloy, so that the composite aluminum oxide containing aluminum oxide, silicon oxide and other optional constituents can be obtained; and the composite aluminum oxide can be used for replacing part of the main raw material aluminum oxide of the aluminum electrolysis cell to produce the aluminum-silicon-based alloy. The division for the optional constituents and the unused constituents of the coal ashes can be determined according to the chemical constituents (the chemical constituents of the coal ashes obtained by blending several coal ashes) of the coal ashes and the constituents of the produced aluminum-silicon alloy.

Description

technical field [0001] The invention belongs to the fields of producing alumina from fly ash and aluminum metallurgy, specifically, extracting composite alumina from fly ash, which can be used as a partial substitute for alumina, the main raw material of an aluminum electrolytic cell, for production Al-Si alloy. Background technique [0002] For the convenience of description, the corresponding relationship between the names of substances and molecular formulas mentioned in the article is as follows: [0003] ① Alumina (Al 2 o 3 ), silicon oxide (SiO 2 ), iron oxide (Fe x o y ), calcium oxide (CaO), magnesium oxide (Mg x o y ), titanium oxide (TiO 2 ), rare earth oxides (Re x o y ), sodium oxide (Na 2 O), potassium oxide (K 2 O). [0004] ②Al-Si Alloy = Al-Si-based alloy (that is, an alloy with Al-Si as the base metal and other small amounts of elements). [0005] Fly ash is the ash formed by burning coal powder, coal slime and other fuels discharged from therm...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 崔佩霞杨卫康郭龙
Owner 崔佩霞
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