复杂卡林型金矿选冶联合工艺的研究与探索

Research and exploration on the combined technology of beneficiation and metallurgy for complex Carlin type gold deposits

某低品位超大型难处理金矿属于卡林型金矿,金品位偏低,矿石难选,采用常规的选矿工艺及预氧化技术处理,综合经济效益不理想。某研究院对该原料在实验室开展了工艺矿物学研究及浮选、直接氰化浸出、焙烧-氰化浸出、生物预氧化-氰化浸出等探索性试验,试验结果表明,采用抑砷浮硫技术不能实现该矿的硫砷分离,原因是毒砂粒度过细,且毒砂与黄铁矿伴生和共生,当上浮黄铁矿时,毒砂与黄铁矿连体被连带上浮进入精矿。在此基础上,研究院提出了联合选冶工艺方案"预氧化-矿石脱泥-硫砷共浮-抑硫浮砷-流态化焙烧-氰化浸出",该方案能够实施的关键技术是抑硫浮砷技术与原矿脱泥技术。目前,抑硫浮砷试验已有成功报道,矿石脱泥的方法有旋流器脱泥和浮选脱泥,未来,此联合选冶工艺的实施将会大幅降低此类难选冶金矿的综合选冶成本,并可实现异地制酸和冶炼,充分体现矿石的资源价值。

A low grade super large refractory gold deposit belongs to Carlin type gold deposit. The gold grade is low and the ore is difficult to separate. The comprehensive benefit is not ideal by using conventional beneficiation process and pre-oxidation technology. A research institute carried out process mineralogy research on the raw material and exploratory tests such as flotation,direct cyanide leaching,roasting-cyanide leaching,and biological preoxidation-cyanide leaching in the laboratory. The test results show that the separation of sulfur and arsenic in the mine cannot be realized by using arsenic-suppressing and sulfur-floating technology. The reason is that the particle size of arsenopyrite is too fine,and arsenopyrite and pyrite are associated and symbiotic. When pyrite is floated,the association of arsenopyrite and pyrite is floated into the concentrate. On the research basis,the research institute proposed a combined beneficiation-metallurgy process scheme ‘preoxidation-ore desliming-sulfur arsenic coflotation-sulphurization-arsenic flotation-boiling roasting-cyanidation leaching’. The key technologies that the scheme can implement are sulfur-sulphurization-arsenic flotation technology and raw ore desliming technology. At present,the experiment of sulfur suppression and arsenic flotation has been successfully reported. The methods of ore desliming include cyclone desliming and flotation desliming. In the future,the implementation of this combined beneficiation and smelting process will greatly reduce the comprehensive beneficiation and smelting cost of such refractory gold ores.