Title:
高品位石膏の製造方法
Document Type and Number:
Japanese Patent JP6742596
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing gypsum extremely less in fluorine amount and heavy metal amount from a sulfuric acid waste liquid of a nonferrous smelting.SOLUTION: There is provided a manufacturing method of gypsum having an aluminum melting process for adding metal aluminum or metal aluminum-containing article to a waste water containing hydrofluoric acid, sulfuric acid and copper and arsenic to melt the metal aluminum, generating a fluoroaluminate ion by a reaction of molten aluminum and fluorine in a liquid and reducing copper and arsenic in the liquid by melting the metal aluminum, a copper arsenic separation process for solid liquid separating reduced copper and arsenic, and a gypsum generation process for generating gypsum by adding a neutralizer containing calcium to a separated liquid content and remaining the fluoroaluminate ion in the liquid, and preferably gypsum having fluorine content of 0.2 mass% or less and arsenic content of 0.1 mass% or less and containing practically no copper is manufactured.SELECTED DRAWING: Figure 1
Inventors:
Daisuke Haraguchi
Hiroshi Hayashi
Hiroshi Hayashi
Application Number:
JP2016167596A
Publication Date:
August 19, 2020
Filing Date:
August 30, 2016
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
C01F11/46; C02F1/70; C22B3/44; C22B3/46; C22B15/00
Domestic Patent References:
| JP50160191A | ||||
| JP2015020103A | ||||
| JP2012012230A | ||||
| JP2003137545A | ||||
| JP47034198A | ||||
| JP60228627A |
Foreign References:
| US5531903 |
Attorney, Agent or Firm:
Hiroshi Chiba