摘要
室温条件下将海绵金用王水溶解形成金氯酸溶液，再用纯净的不含金黄铁矿吸附溶液中的金，烘干后用过氧化氢溶液将其分解，发现溶液中出现粒状、片状及壳皮状金。对溶液中金和铁的含量测定结果表明，随着黄铁矿的分解溶液中铁含量增加，金含量也随之增加，但当溶液中出现小金粒或金片后，溶液中的金含量急剧下降，并保持相对稳定。
As a kind of gold deposits, “gossan”
gold deposits are formed through surface oxidation of primary ore deposits. The experimental
study on the decomposition reaction of gold bearing pyrite at the normal temperature and
pressure was carried out, and the results revealed the relation between the decomposition of
gold bearing pyrite and the activation of gold in this process. The formation of limonite and the
mechanism of gold activation, migration and enrichment have been discussed in this paper.
The experiment was conducted at normal temperature and pressure. First, gold bearing pyrite
was prepared in order that the gold content of pyrite was high enough for the experiment. Gold
was dissolved by aqua regia at normal temperature and pressure to form HAuCl 4 solution.
When pyrite was put into the solution, HAuCl 4 would be absorbed. After filtering and stoving,
the gold bearing pyrite was obtained. Second, the gold bearing pyrite was decomposed by
hydrogen peroxide. Hydrogen peroxide was put into the solution with gold bearing pyrite every
day, and the gold bearing pyrite was decomposed slowly. A few days later, some grained,
schistose and pyrite shaped nuggets were formed in the solution. At the same time, Fe 2(SO
4) 3 decomposed from pyrite was converted into Fe(OH) 3 and then hyposiderite was formed.
Therefore, this experiment simulated the forming process of the “gossan” gold deposits in
the nature. The determination of the Fe and Au content in the solution shows that the Fe and Au
content increases with the decomposition of the gold bearing pyrite. The gold concentration
decreases drastically when the nuggests grow and then keep stable.
出处
《矿床地质》
CAS
CSCD
北大核心
1999年第3期285-290,共6页
Mineral Deposits
基金
国家自然科学基金
关键词
硫化物氧化
吸附
分解
金
黄铁矿
金矿化
sulfide
oxidation, absorption and decomposition, gold, pyrite, hydrodgen peroxide
