Details

Autor(en) / Beteiligte

• Ruan, Shufeng
• Qiu, Dingfan
• Wang, Chengyan
• Jie, Xiaowu
• Zhang, Yonglu
• Yao, Zhichao
• Chen, Yongqiang

Titel

Microwave Pyrolysis Pretreatment of High Arsenic Refractory Gold Sulfide Concentrates in Nitrogen Atmosphere: Process Optimization and Mechanism Study

Ist Teil von

• JOM (1989), 2022, Vol.74 (1), p.167-177

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The process optimization and mechanism of microwave pyrolysis in a nitrogen atmosphere were studied to improve the gold leaching rate for high-arsenic-refractory gold sulfide resources, mainly containing minerals of elemental sulfur, dense pyrite, and arsenopyrite. The decomposability was evaluated using thermodynamic and thermogravimetric analyses. Faster microwave heating characteristics were confirmed under a nitrogen atmosphere. The main factors affecting microwave pyrolysis were pyrolysis temperature, time, and protective nitrogen temperature. The optimum conditions for the four variables were determined to remove 97.96% of As and 50.43% of S. The arsenopyrite first formed pyrite through a shrinking nuclear process in the presence of sulfur. The decomposition of pyrite and pyrrhotite is random. Many pores and cracks are formed to expose the locked gold for leaching. The gold leaching rate reached 95.36% with sodium cyanide and a small amount of lead nitrate; this rate was much higher than that observed before pretreatment (38.65%).