Title:
セレン、テルル、および白金族元素の分離回収方法
Document Type and Number:
Japanese Patent JP6810887
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a separation recovery method favorable in separability of tellurium and platinum group elements, high in reaching rate of tellurium and platinum group elements and high in recovery rates thereof.SOLUTION: A separation recovery method for selenium, tellurium and platinum group elements includes: an oxidation-roasting process of selectively volatilizing selenium by heating a roasting raw material under an oxidative atmosphere; an alkali leaching process of leaching tellurium by adding an oxidation-roasting residue to an alkali solution; an alkali fusion process of adding an alkaline material flux to an alkali leaching residue to perform heat-fusion; and a hydrochloric acid oxidation-leaching process of adding an oxidant and hydrochloric acid to an alkali fusion material to leach the platinum group elements. The method is characterized by: making tellurium leach in pH 13 or higher by suspending the oxidation-roasting residue in the alkali solution, and recovering a leachate and a leaching residue including the platinum group elements in the alkali leaching process; and heating the mixture of the alkali leaching residue and the flux at 350-500°C to perform the alkali fusion in the alkali fusion process.SELECTED DRAWING: Figure 1
Inventors:
Shota Nakayama
Ryosuke Sato
Takahiro Uno
Satoru Okada
Ryosuke Sato
Takahiro Uno
Satoru Okada
Application Number:
JP2016201034A
Publication Date:
January 13, 2021
Filing Date:
October 12, 2016
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
C22B11/00; C22B1/02; C22B3/10; C22B3/12; C22B7/04; C22B61/00
Domestic Patent References:
| JP2016160479A | ||||
| JP2004190133A |
Attorney, Agent or Firm:
Hiroshi Chiba