Method for recovering and purifying waste sulfuric acid solution
US10689255B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2019 |
| Grant date | Jun 23, 2020 |
| Priority date | — |
| Expiry date | Aug 28, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/901
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for recovering and purifying a waste sulfuric acid solution includes steps of: adding a coupling agent (m) to the waste sulfuric acid solution, and mixing uniformly to obtain a mixture (a); adding a coupling agent (n) to the mixture (a), and mixing uniformly to obtain a mixture (b); and adding a synergistic agent to the mixture (b), thoroughly stirring and filtering to obtain a purified sulfuric acid solution. The method adds the coupling agent and the synergistic agent to the waste sulfuric acid, and a removal rate of the heavy metal ions in the waste sulfuric acid can reach 99%. The purified sulfuric acid solution can be recycled. The method is simple to operate, and can remove a wide variety of heavy metal ions such as copper, zinc, lead, mercury, nickel, iron, cadmium and manganese in the waste sulfuric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.