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秘鲁某复杂多金属金精矿有价元素综合回收试验研究

Experimental study on comprehensive recovery of valuable elements from complex polymetallic gold concentrate in Peru

  • 摘要: 针对秘鲁某复杂多金属金精矿有价元素采用单一直接氰化、焙烧—氰化等工艺难以有效回收与综合利用的技术瓶颈,采用直接氰化浸出金银—氰化尾渣铅锌混合浮选—铅锌尾矿活化浮选铜联合工艺流程,并对铅锌混合浮选矿浆浓度、活化剂用量等条件进行优化。试验结果表明:直接氰化金、银浸出率分别达到96.50 %和90.20 %;氰化尾渣铅锌混合浮选闭路试验获得的铅锌精矿产率为7.69 %,铅、锌品位分别为23.60 %、26.50 %,铅、锌回收率分别达到76.90 %、78.37 %;铅锌尾矿活化浮选铜获得的铜精矿产率为8.05 %,铜品位15.23 %,铜回收率为90.81 %;氰化尾渣中未浸出的金、银部分富集于铅锌精矿、铜精矿中,有利于火法熔炼过程中的有效回收,同时硫精矿硫品位达到44.38 %,满足硫铁矿制酸原料的要求。该技术方法实现了复杂多金属金精矿的综合回收,为同类型金精矿的资源化与高值化利用提供了新的技术途径。

     

    Abstract: To address the technical bottleneck posed by the difficulty in effectively recovering and comprehensively utilizing valuable elements from a complex polymetallic gold concentrate in Peru using individual processes such as direct cyanidation and roasting−cyanidation, a combined flowsheet was developed, consisting of direct cyanidation leaching of gold and silver, bulk flotation of lead and zinc from the cyanidation residue, and copper flotation from the lead-zinc tailings after activation. Conditions including the pulp concentration for lead-zinc bulk flotation and the activator dosage were optimized. The results show that the gold and silver leaching recoveries obtained by direct cyanidation are 96.50 % and 90.20 %, respectively. The closed-circuit lead-zinc bulk flotation test on the cyanidation residue produces a lead-zinc bulk concentrate with a yield of 7.69 %, Pb and Zn grades of 23.60 % and 26.50 %, respectively, and Pb and Zn recoveries of 76.90 % and 78.37 %, respectively. Copper flotation from the lead-zinc tailings after activation produces a copper concentrate with a yield of 8.05 %, a Cu grade of 15.23 %, and a Cu recovery of 90.81 %. The unleached gold and silver in the cyanidation residue are partly enriched in the lead-zinc bulk concentrate and the copper concentrate, facilitating their effective recovery during pyrometallurgical smelting. Meanwhile, the sulfur grade of the sulfur concentrate is 44.38 %, meeting the requirements for pyrite feedstock used in sulfuric acid production. This process enables the comprehensive recovery of valuable elements from the complex polymetallic gold concentrate and provides a new technical approach to the resource recovery and high-value utilization of this type of gold concentrate.

     

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