(1. 湖南城市學院 化學與環(huán)境工程學院，益陽 413000；
2. 中南大學 冶金與環(huán)境學院，長沙 410083；
3. 河南中原黃金冶煉廠有限責任公司 河南省黃金資源綜合利用重點實驗室，三門峽 472000)
摘 要: 采用水合肼和鹽酸羥胺復合還原沉金后液得到鉑鈀精礦，其中硒和碲總含量達到71.15%，金、鉑和鈀總含量達到3.65%，從鉑鈀精礦中分離硒碲對富集及回收貴金屬金鉑鈀具有重要意義。熱力學分析表明：在堿性條件下，采用雙氧水作為氧化劑，可以將硒和碲氧化為高價態(tài)的離子化合物被浸出，金、鉑和鈀留在固相中。采用雙氧水氧化堿浸分離鉑鈀精礦中硒碲，實驗結果表明其適宜反應條件為：雙氧水用量為250 mL/L，NaOH濃度為5 mol/L，反應溫度為85 ℃，液固比為5:1(mL/g)，反應時間為2 h，在此適宜條件下，硒和碲的浸出率分別為82.49%和92.45%，金、鉑和鈀均未被浸出。氧化堿浸后渣中貴金屬總含量達到23.18%，相對鉑鈀精礦富集6.35倍。
關鍵字: 沉金后液；鉑精礦；鈀精礦；硒；碲；氧化堿浸；熱力學
（1. School of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, China;
2. School of Metallurgical and Environmental, Central South University, Changsha 410083, China;
3. Henan Province Key Laboratory of Gold Resource Utilization, Henan Zhongyuan Gold Smelter Co., Ltd., Sanmenxia 472000, China）
Abstract:Platinum and palladium concentrate is obtained from precipitated gold solution reduced by hydrazine hydrate and hydroxylamine hydrochloride. The total content of selenium and tellurium reaches up to 71.15%, and that of gold, platinum and palladium reaches 3.65% in platinum and palladium concentrate. Therefore, the separation of selenium and tellurium from platinum and palladium concentrate is important for the enrichment and recovery of precious metals. Thermodynamic analysis shows that in an alkaline environment, using hydrogen peroxide as oxidant, Se and Te can be oxidized to soluble ionic compounds with a higher valence state, while Au, Pt and Pd stay in the solid phase stably. Oxidative alkaline leaching experimental results show that the suitable conditions for the separation of selenium and tellurium from platinum and palladium concentrate are as follows: the amount of hydrogen peroxide is 250 mL/L, NaOH concentration is 5 mol/L, leaching temperature is 85 ℃, liquid-solid ratio is 5？1(mL/g) and reaction time is 2 h. Under the suitable conditions, the leaching rates of selenium and tellurium are 82.49% and 92.45%, respectively, while the gold, platinum and palladium are not leached out. The precious metals are enriched, and its total content is 23.18% in oxidative alkaline leaching residue, which is 6.35 times higher than that in the platinum and palladium concentrate.
Key words: precipitated gold solution; platinum concentrate; palladium concentrate; selenium; tellurium; oxidative alkaline leaching; thermodynamic
