(北京有色金属研究总院，北京 100088)
摘 要: 采用TG-DTA热分析法、 X射线衍射法对黄金洞 焙砂的结构进行了研究，结果表明， 黄金洞焙砂中仍含有8%的硫， 并以单质硫， Fe1-xS, Fe1-xS和FeS2等形式存在。 由于硫化物包裹的金不能暴露于氰化液中，以及这些物质的存在会大量消耗氰化过程中所需要的氧， 因而导致黄金洞焙砂浸金率低。 而此焙砂分别经300 ℃， 580 ℃焙烧处理后， 焙砂氰化浸金率相应地提高到91.7%和93％。因此黄金洞焙砂浸金率低的原因是脱硫阶段氧化气氛不足， 脱硫不完全，是焙砂欠烧而非过烧造成的。
关键字: 黄金洞焙砂 成分 含硫量 氰化浸金
（Beijing General Reseach Institute of Nonferrous Metals, Beijing 100088, P. R. China）
Abstract:The phase structure and thermal properties of calcine of a gold mine in Huangjindong, Pingjiang, Hunan, were studied by means of TG-DTA and X-ray diffraction. The experimental results showed that the calcine contained 8% sulphur in the forms of S, Fe1-xS, Fe1-x S and FeS2. The sulphur and sulfide had a deleterious effect on the cyanidation of auriferous calcines because they tended to cover the gold and the gold could not contact with cyanide solution. After the calcine was roasted at 300 ℃ and 580 ℃, the gold leaching rate reached 91.7% and 93% respectively. The low gold leaching rate of Huangjindong calcine was due to the removal of sulphur in an anoxic atmosphere and in an incomplete reaction, and the calcine was under roasting not over roasting.
Key words: gold calcine component sulphur content gold leaching rate
