一种粗铋中铜砷碲铅的协同除杂方法
By employing melting and pre-oxidation, synergistic slag formation and impurity removal, and vacuum distillation, the problem of synergistic deep removal of multiple impurities in crude bismuth was solved, achieving efficient bismuth recovery and an environmentally friendly refining process, resulting in high-purity refined bismuth products and high recovery rates.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANDONG HUMON SMELTING
- Filing Date
- 2026-04-30
- Publication Date
- 2026-07-17
AI Technical Summary
Existing crude bismuth refining processes are lengthy, cause serious environmental pollution, make it difficult to remove multiple impurities in a coordinated and deep manner, and result in low bismuth recovery rates. Traditional methods also have difficulty separating lead and bismuth, which have similar properties, leading to low comprehensive utilization of resources.
The method employs melting and pre-oxidation, synergistic slag formation and impurity removal, and vacuum distillation. It utilizes composite impurity removal agents such as iron powder, bismuth phosphate, and sodium sulfide to carry out a pre-oxidation reaction in an inert atmosphere to generate FeS heterogeneous crystal nuclei. Combined with phosphate slag formation and the flux calcium metaborate, copper, arsenic, tellurium, and lead are removed simultaneously, and then purified further through vacuum distillation.
It achieves efficient and synergistic deep removal of copper, arsenic, tellurium, and lead, and effective recovery of silver, shortening the production cycle, improving the recovery rate and purity of bismuth, reducing environmental pollution, and meeting the requirements of the national standard Bi9995 grade.