With the evolving landscape of gold mineral resource development and utilization, the easily treatable gold resources are continuously decreasing, while refractory gold minerals are becoming the most important resources in the field of gold extraction. In these original ores, most of the gold is encapsulated in the lattice of pyrite and arsenopyrite, resulting in difficulty of gold transfer into the solution during the leaching process. The most effective method to solve the problem of insufficient contact between gold particles and leaching reagent is oxidation pretreatment before leaching. Different from traditional high-temperature roasting, concentrated sulfuric acid was used as both an oxidant and leaching agent in a sulfide-encapsulated refractory gold ore to decompose the pyrite in the curing environment to expose the gold and improve the leaching efficiency. The experimental results showed that under the conditions of liquid solid ratio 3:1, curing temperature 240 °C and the reaction time 1.5 h, the weight loss rate and iron removal rate of the ore sample reached the highest value of 60.01% and 99.68%, respectively. The main phase of curing residue was Fe₂(SO₄)₃, and silica was nearly the only phase after washing. At the same time, by combining the sodium thiosulfate system gold leaching method, the gold leaching rate increased from 3.67% to 81.30% before and after pretreatment with concentrated sulfuric acid.

随着金矿资源开发利用格局的不断演变，易加工金资源不断减少，而难处理金矿正成为金矿开采领域最重要的资源。在这些原矿中，大部分金被包裹在黄铁矿和毒砂的晶格中，导致浸出过程中金难以转移到溶液中。解决金颗粒与浸出剂接触不充分问题最有效的方法是浸出前进行氧化预处理。与传统的高温焙烧不同，在硫化物包裹的难处理金矿石中，浓硫酸同时作为氧化剂和浸出剂，在固化环境中分解黄铁矿，使金暴露出来，提高浸出效率。实验结果表明，在液固比3:1、熟化温度240℃、反应时间1.5 h条件下，矿样的失重率和除铁率分别达到最高值，分别为60.01%和99.68%。 ， 分别。固化残渣的主要相是Fe ₂ (SO ₄ ) ₃，洗涤后二氧化硅几乎是唯一的相。同时，结合硫代硫酸钠体系浸金法，浓硫酸预处理前后金浸出率由3.67%提高到81.30%。