锑对难处理金矿石(金精矿)焙烧—氰化浸金的影响

用难处理金矿石和精矿,分别进行了焙烧—焙砂氰化浸金试验、焙烧—焙砂中加入三氧化二锑的氰化浸金试验、加入三氧化二锑焙烧—焙砂氰化浸金试验、精矿湿法浸锑之后焙烧—焙砂氰化浸金试验。试验结果表明,焙砂中加入三氧化二锑不影响氰化浸金,但是焙烧之前加入三氧化二锑焙烧后焙砂的氰化浸金试验指标明显低于未加三氧化二锑焙烧后的焙砂氰化浸金试验指标。此外,精矿湿法浸锑之后焙烧的焙砂氰化浸金的指标明显有改善。由此分析,三氧化二锑不对氰化浸金产生不利影响。锑对焙烧后焙砂氰化浸金的不利影响主要源于锑化合物的熔点低,易于加大焙烧过程中的"二次包裹金"的作用,从而导致金浸出指标下降。锑是难处理含金矿物原料焙烧—焙砂氰化浸金的主要干扰元素之一。

Modelling and process optimisation of antimony removal from a complex copper concentrate

The modelling and optimization for the alkaline sulphide leaching of a complex copper concentrate containing 1.69% Sb and 0.14% Sn were studied.Response surface methodology,in combination with central composite face-centred design（RSM-CCF）,was used to optimise the operating parameters.The leaching temperature,sulphide ion concentration and solid concentration were chosen as the variables,and the response parameters were antimony and tin recovery,and the time required to achieve 90% Sb dissolution.It was confirmed that the leaching process was strongly dependent on the reaction temperature as well as the sulphide ion concentration without any significant dependence on the solid concentration.Furthermore,a mathematical model was constructed to characterise the leaching behaviour.The results from the model allow identification of the most favourable leaching conditions.The model was validated experimentally,and the results show that the model is reliable and accurate in predicting the leaching process.