从复杂银阳极泥中提取金、钯工艺优化与研究

复杂银阳极泥回收金工艺是通过对其水溶液氯化得到分金液，使用亚钠进行还原得到合格金粉，由于外购原料增多，经水溶液氯化得到的分金液含有铂钯，分金液亚钠还原效率仅能控制在65%左右，需二次亚钠还原回收金。然而，得到的二次金粉中钯含量超标，返工易富集循环，不利于钯回收。本研究改进了复杂银阳极泥氯化分金液在进行亚钠一次还原后提取金、钯的工艺，具体工艺流程：首先，通过小型试验对还原后液开展DBC萃金并提纯金工艺，萃余液在进行传统的提取钯工艺的基础上，采用水合肼还原二氯二氨络亚钯得到钯黑。之后，进行工业扩大试验，确定最佳工艺技术条件。整个工艺过程中，金和钯的直收率分别为99.52%和94.53%，技术指标良好。

Research and Optimization on Process of Extraction Gold and Palladium from the Complex Silver Anode Slime

Extraction gold from the complex silver anode slime is that points of gold liquid can be obtained by chloridizing the aqueous solution of the silver anode slime, and then qualified gold powders are obtained after reducing sodium nitrite.Because of the more outsourcing raw material, obtained the points of gold liquid contain platinum as well as palladium, the efficiency of sodium nitrite reduction of the liquid can only be controlled around 65%, thus sodium nitrite reduction for the second time is required.However, the content of palladium in the gold powders exceed standard, and the reword can lead to enrichment of circulation, which will go against the recycle of palladium.Extraction gold and palladium from the complex silver anode slime after sodium nitrite reduction for the first time.Firstly, on the basis of traditional technology of extraction in raffinate and small text on DBC extraction of gold, and we apply palladium black hydrazine hydrate to reduce two chlorine two ammino and palladium so as to get palladium black.And then Industry expanding test is carried out in order to identify the best condition during the process.Overall, technical indicators are all better, additionally, direct recovery efficiency of gold and palladium are 99.52% and 94.53%, respectively.