Title:
テルルと白金族元素の分離方法
Document Type and Number:
Japanese Patent JP6768218
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for recovering a platinum group metal together with tellurium that prevents shortening of the lifetime of an extraction solvent and efficiently separates tellurium and a platinum group metal.SOLUTION: The method for separating tellurium and a platinum group metal comprises: a step of adjusting a chloride ion concentration in an aqueous solution containing tellurium and a platinum group metal (hereinafter referred to as a treating solution) to not less than 3 mol/L to less than 5 mol/L; a step of mixing the treating solution having a chloride ion concentration adjusted to the above-mentioned range into a dibutyl carbitol liquid as an organic solvent to extract tellurium of the treating solution in the organic solvent; a hydrochloric acid washing step of separating and taking out an organic phase including tellurium and a water phase in which a platinum group metal remains, washing the organic phase using hydrochloric acid having a concentration of not less than 4 mol/L to less than 5 mol/L to migrate the platinum group metal to the hydrochloric acid, mixing hydrochloric acid as a post-washing liquid into the water phase separated from a tellurium extraction step; a step of mixing the organic phase subjected to hydrochloric acid washing into water or hydrochloric acid having a concentration of 2 mol/L or less to back-extract tellurium in the hydrochloric acid; and a step of separating and taking out the water phase in which tellurium is back-extracted from the organic phase.SELECTED DRAWING: Figure 1
Inventors:
Shota Nakayama
Ryosuke Sato
Takahiro Uno
Satoru Okada
Ryosuke Sato
Takahiro Uno
Satoru Okada
Application Number:
JP2017007966A
Publication Date:
October 14, 2020
Filing Date:
January 19, 2017
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
C22B11/00; C22B3/26
Domestic Patent References:
| JP2000239753A | ||||
| JP2005097695A | ||||
| JP2004035969A | ||||
| JP2004238735A |
Attorney, Agent or Firm:
Hiroshi Chiba