(1. 北京科技大學 土木與環(huán)境工程學院，北京 100083；
2. 中國科學院 過程工程研究所 生化工程國家重點實驗室，北京 100190)
摘 要: 將鎳磁黃鐵礦與(NH4)2SO4混合后在高溫下焙燒，考察(NH4)2SO4用量、浸出溫度、浸出時間和稀硫酸浸出液的pH值對焙燒產(chǎn)物中金屬元素浸出率的影響，并在氨水−(NH4)2SO4混合溶液中浸出焙燒產(chǎn)物。結(jié)果表明：在不同情況下，Ni和Cu的浸出率較高，Mg和Fe的浸出率較低；氨性溶液有利于Ni和Cu的浸出，總氨濃度為7 mol/L時，Ni和Cu的浸出率分別為89.56%和79.35%；低pH值的稀硫酸溶液有利于Mg和Fe的浸出，pH值為0.5時，Mg和Fe的浸出率分別為61.39%和62.56%。由掃描電鏡−能譜分析和XRD分析可知，礦樣中Ni和Cu大部分被浸出；由于焙燒產(chǎn)物中部分Mg和Fe以鐵酸鈣和硅酸鎂等形態(tài)存在，Mg和Fe的浸出率較低。
關鍵字: 鎳磁黃鐵礦；硫酸銨；焙燒；浸出；能譜
（1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. National Key State Laboratory of Biochemical Engineering, Institute of Process Engineering,
Chinese Academy of Science, Beijing 100190, China）
Abstract:Nickel pyrrhotite blended with ammonium sulfate was roasted at elevated temperature. The effects of amount of ammonium sulfate, leaching temperature, leaching time and pH value of sulfuric acid leaching solution on leaching rates of metal elements in roasted products were investigated. The roasted products were also leached with a mixed solution containing ammonia and ammonium sulfate. The results show that the leaching rates of Ni and Cu are higher, and the leaching rates of Mg and Fe are lower under different conditions. The ammonia solution is beneficial to leaching Ni and Cu. When the total ammonia concentration is 7 mol/L, the leaching rates of Ni and Cu are 89.56% and 79.35%, respectively. The sulfuric acid solution with low pH value is beneficial to leaching Mg and Fe. When the pH value is 0.5, the leaching rates of Mg and Fe are 61.39% and 62.56%, respectively. The SEM-EDS and XRD analysis shows that most of Ni and Cu are leached out. The leaching rates of Mg and Fe are lower because of undissolved magnesium silicate and calcium ferrite in the roasted products.
Key words: nickel pyrrhotite; ammonium sulfate; roast; leaching; power spectrum
