针对重砂中贵金属与杂质高效分离的难题，采用重砂预处理—硫酸化焙烧—铅物相转化—醋酸浸铅—沉铅液循环浸出—贵金属富集熔炼工艺，系统优化各工艺参数，实现金、银的高效富集与回收。结果表明，硫酸化焙烧（焙烧温度 600 ℃、硫酸用量 0.8 L/kg、焙烧时间 2 h）有效将方铅矿转化为硫酸铅；铅物相转化（转化温度 60 ℃、碳酸钠用量 400 g/kg、反应时间 2 h）及醋酸浸出（浸出温度 70 ℃、醋酸用量 0.6 L/kg、液固比 5∶1、浸出时间 2 h）实现铅的选择性浸出，铅浸出率达90 %以上，浸渣产率为 39.32 %；贵金属富集熔炼获得的合质金中金、银品位分别为 86.43 %和2.29 %，金、银回收率分别为 99.93 %和 98.96 %。该工艺通过多环节协同优化，兼具高效性与工程可行性，为重砂及同类复杂物料的高值化利用提供了可靠技术方案，具有显著的工业应用价值。

To address the challenge of efficient separation of precious metals and impurities in gravity concen‑trate, a process involving gravity concentrate pretreatment-sulfuric acid roasting-lead phase transformation-acetic acidlead leaching-lead‑bearing solution cyclic leaching-precious metal enrichment smelting was developed. The processparameters were systematically optimized to achieve efficient enrichment and recovery of gold and silver. Results showthat sulfuric acid roasting（roasting temperature 600 °C, sulfuric acid dosage 0.8 L/kg, roasting time 2 h）effectivelyconverts galena into lead sulfate; lead phase transformation（conversion temperature 60 °C, Na2CO3 dosage 400 g/kg,reaction time 2 h）and acetic acid leaching（leaching temperature 70 °C, acetic acid 0.6 L/kg, liquid‑solid ratio 5∶1,leaching time 2 h）realize selective lead leaching, with a lead leaching rate exceeding 90 % and a leaching residueyield of 39.32 %. The alloy gold obtained by precious metal enriched smelting contains 86.43 % Au and 2.29 % Ag,with gold and silver recovery rates of 99.93 % and 98.96 %, respectively. This multi‑stage synergistic optimizationprocess combines high efficiency with engineering feasibility, providing a reliable technical solution for high‑valueutilization of gravity concentrate and similar complex materials, and holds significant industrial application value.