Two-Step Roasting for High-Purity Perrhenic Acid Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing perrhenic acid from rhenium sulfide lack a pyrometallurgical process that effectively removes impurities, particularly sulfur and other metals like zinc and bismuth, resulting in low-purity products.
Innovation Solution
A two-step roasting process is employed, where the first step generates sulfur oxide for discharge and leaves rhenium oxide as a residue, and the second step further separates rhenium oxide from impurities, allowing for the production of high-purity perrhenic acid through the dissolution of rhenium oxide in water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-step roasting process is used to convert rhenium sulfide to rhenium oxide, then the process is simple and fast, but the purity of the resulting rhenium oxide is low due to remaining impurities
Solution Approach 1:
The roasting process is divided into two distinct steps: first roasting to convert rhenium sulfide to rhenium oxide while removing sulfur, and second roasting to further purify the rhenium oxide by removing remaining impurities. This segmentation allows each step to be optimized for its specific purpose, achieving high purity without excessive complexity.
Solution Approach 2:
The first roasting step performs preliminary conversion of rhenium sulfide to rhenium oxide and removal of sulfur before the second roasting step. This preliminary action prepares the material for the final purification step, ensuring that the second step can focus on removing remaining impurities efficiently.
2Manufacturing precision
If hydrometallurgical process is used to produce perrhenic acid from crude rhenium sulfide, then the process can achieve high purity, but the process complexity and cost increase
Solution Approach 1:
The invention replaces complex hydrometallurgical processes with a pyrometallurgical approach using two roasting steps. Instead of using complex chemical extraction and purification procedures, the process uses thermal oxidation to convert rhenium sulfide to rhenium oxide and then to perrhenic acid, simplifying the overall process while maintaining high purity.
3Object-generated harmful factors
If roasting is performed at high temperature to gasify sulfur oxide, then sulfur removal is effective, but energy consumption increases
Solution Approach 1:
The roasting process is segmented into two steps with different temperature requirements. The first step uses moderate temperature to convert rhenium sulfide to rhenium oxide, while the second step uses higher temperature to gasify sulfur oxide and remove impurities. This segmentation allows energy to be applied efficiently at each stage rather than requiring continuously high temperature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process achieves high-purity perrhenic acid production, suitable for further conversion into valuable compounds like ammonium perrhenate, with improved purity and reduced impurity content compared to single-step roasting methods.
Implementation Method 1
a step for performing a first roasting process of rhenium sulfide under an oxygen-containing gas to generate rhenium oxide and sulfur oxide
Implementation Method 2
the sulfur oxide being gasified for discharge
Implementation Method 3
a step for dissolving the gasified rhenium oxide into water while water-cooling to obtain the aqueous solution of perrhenic acid
Data Source
AI summary
A method allowing production of high-purity perrhenic acid from rhenium sulfide by applying pyrometallurgical process is provided. A method for producing an aqueous solution of perrhenic acid, comprising: 1) a step for performing a first roasting process of rhenium sulfide under an oxygen-containing gas to generate rhenium oxide and sulfur oxide, the sulfur oxide being gasified for discharge and the rhenium oxide being obtained as a roasted residue; 2) a step for performing a second roasting process of the roasted residue under an oxygen-containing gas to collect gasified rhenium oxide; 3) a step for cooling and solidifying the gasified rhenium oxide, or a step for dissolving the gasified rhenium oxide into water while water-cooling to obtain the aqueous solution of perrhenic acid; and 4) in case where the rhenium oxide is solidified, a step for dissolving the solidified rhenium oxide into water, or heating and gasifying the solidified rhenium oxide and then dissolving the gasified rhenium oxide into water, to obtain the aqueous solution of perrhenic acid.