羰基精炼镍和贵金属的富集与提取

Carbonyl Refining Nickel and Extraction of Precious Metals

针对中国镍冶金过程的３种中间产品中含金和铂族金属在０ｘ％，００ｘ％，０００ｘ％，研究了镍羰化的条件。在Ｐｃｏ≈１００００ｋＰａ、１６０±１０℃，２ｄ内镍的羰化率＞９７％。考察贵金属在羰化过程中的行为。用化学分析和Ｘ光荧光光谱分析镍羰化物热分解的镍铁粉中，贵金属含量皆小于分析灵敏度，这表明贵金属在上述羰化过程中无损失，全都富集在羰化残渣（铜渣）中，品位提高３～４倍。并讨论铜渣的物质组成和各种处理方法。最后指出含贵金属００２５％是铜渣中贵贱金属的等值点。贵金属含量超过此点则铜渣处理工艺的选择应以富集提取贵金属为主要目的。采用加压硫酸浸出—电积工艺最佳。

Carbonyl conditions for three kinds of nickel metallurgical intermediates containing 0 x%,0 0x%, 0 00x%, of precious metals from China were tested. Over 97% of nickel was extracted as carbonylation within 2-day at Pco ≈10000 kPa and 160±10℃. Behaviour of precious metals in carbonyl process was investigated. The contents of PMs in decomposed nickel-iron powder by chemical and X-radiation fluoro scopy spectrum analyses were below analysis sensitivity. It demonstrated the PMs were not lest in above carbonyl process and concentrated in residue. Contents of PMs in residue have been increased by 3～4 time. The composition and treatment technology of cupper residue were discoursed. Content 0 025% of PMs in residue is balance point of base metals and PMs value. Over 0 025%,the treatment technology of residue is obliged to effective extract PMs. Pressure sulphate leaching-electrowinning technology is best process.