MATERIAL FOR ALUMINUM REFINEMENT, ALUMINUM REFINEMENT, METHOD FOR PRODUCING HIGHLY PURE ALUMINUM AND ELECTROLYTIC CAPACITOR ALUMINUM, AND ELECTROLYTIC CAPACITOR ALUMINUM

Title:

MATERIAL FOR ALUMINUM REFINEMENT, ALUMINUM REFINEMENT, METHOD FOR PRODUCING HIGHLY PURE ALUMINUM AND ELECTROLYTIC CAPACITOR ALUMINUM, AND ELECTROLYTIC CAPACITOR ALUMINUM

Document Type and Number:

Japanese Patent JP2004300571

Kind Code:

A

Abstract:

To effectively remove peritectic-crystal-forming impurities and eutectic-crystal-forming impurities in aluminum refinement.

The raw material used in aluminum refinement comprises a peritectic-crystal-forming element and boron in an amount which is larger by 5 to 80 ppm mass than the total chemical equivalent when the boron is calculated as a metal boride in which the metal is the eutectic-crystal-forming element. The raw material is melted in a melting furnace 1 to form a molten metal. In a reaction chamber 2A, the eutectic-crystal-forming element is reacted with boron in the molten metal to form a metal boride. The formed metal boride and the metal boride formed in the melting step are removed. In refinement chambers 2B, 2C, 2D, and 2E, highly pure aluminum freed of the eutectic-crystal-forming elements including unreacted boron is crystallized by segregation solidification.

Inventors:

YOSHIDA KATSUOKI
MAEDA MASAO
SAKAGUCHI MASASHI

Application Number:

JP2004070896A

Publication Date:

October 28, 2004

Filing Date:

March 12, 2004

Export Citation:

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Assignee:

SHOWA DENKO KK

International Classes:

B22D1/00; C22B9/02; C22B9/05; C22B9/10; C22B21/06; C22C1/02; C22C21/00; H01G9/00; H01G9/055; C22B7/00; (IPC1-7): C22B21/06; B22D1/00; C22B9/05; C22B9/10; C22C21/00; H01G9/00; H01G9/055

Attorney, Agent or Firm:

Hisayoshi Shimizu
Ken Takada
Yoshihito Shimizu

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