Patent · US Active

Method of extracting Te and bismuth oxide and recovering byproducts

US8277772B2 · kind B2 · utility

0Cited by

2References

18Claims

0Family size

Assignee

Jun Wang · CN

Inventors

Jun Wang · Nanjing, CN
Xiuzhen Wang · Shanghai, CN
Zexian Song · Chengdu, CN

Key dates

Filing date	Jun 2, 2009
Grant date	Oct 2, 2012
Priority date	—
Expiry date	Sep 22, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A method of extracting Te and bismuth oxide and recovering byproduct comprises: leaching raw materials with a Te content of ≧1.8% by utilizing a leaching system containing H2SO4, Cl−, Br−, NH4+ and NaClO3, reducing leach solution with SO2 gas by precipitation method after separating impurities from it, washing with concentrated hydrochloric acid to obtain tellurium precipitation (18), purifying to obtain Te with a purity of higher than 99.99%. The filtrate produced is used for extracting Bi2O3 with a purity of higher than 99.99% when Bi content in the raw material is ≧2%. Acidic waste solution produced during the process could be returned to the leaching step for recycle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.