Aiming to explore a sustainable process for tungsten extraction from wolframite concentrate, the digestion behavior and mechanism of wolframite in HCl solution at atmospheric pressure were firstly investigated in this work. The results showed that the digestion efficiency of wolframite reached 99.3% at the optimum condition: particle size of D(95) = 20 μm, stirring intensity of 250 r/min, reaction temperature of 90 °C, HCl stoichiometric ratio of 3.0, liquid to solid ratio of 3:1, and duration of 4 h. In the initial stage of digestion, tungsten was mainly dissolved into HCl solution, when the tungsten dissolution reached balance, solid H₂WO₄ layers were formed on the particle surface. The accumulation of Fe²⁺ and Mn²⁺ in HCl solution reduced the digestion efficiency of wolframite. The process of atomization-oxidative thermal decomposition is feasible for the recovery of Fe and Mn and recycling of HCl from the mother solution of digestion. Additionally, it was showed that the digested product had an excellent leachability of tungsten in NH₃·H₂O solution with WO₃ leaching efficiency above 99.5%, and the (NH₄)₂WO₄ solution was qualified for ammonium paratungstate (APT) production. The wrapping of wolframite by quartz, as well as the solid H₂WO₄ layers covering on wolframite particles, is a crucial factor for the incomplete digestion. This work has the potential to develop a novel technique for tungsten extraction from wolframite concentrate bypassing the alkali leaching process.

为了探索从黑钨矿精矿中提取钨的可持续工艺，本工作首先研究了大气压下黑钨矿在 HCl 溶液中的消化行为和机理。结果表明，在最佳条件下，黑钨矿的消化效率达到99.3%：粒径D(95)=20 μm，搅拌强度250 r/min，反应温度90 ℃，HCl化学计量比3.0，液体与固体的比例为 3:1，持续时间为 4 小时。在消解初期，钨主要溶解在HCl溶液中，当钨溶解达到平衡时，颗粒表面形成固体H ₂ WO ₄层。^{Fe 2+}和Mn ²⁺的积累在 HCl 溶液中降低了黑钨矿的消化效率。雾化-氧化热分解工艺对消化母液中Fe、Mn的回收和HCl的循环利用是可行的。此外，经消解后的产物在NH ₃ ·H ₂ O溶液中对钨的浸出性能优良，WO ₃浸出率在99.5%以上，(NH ₄ ) ₂ WO ₄溶液可用于仲钨酸铵(APT)。生产。石英包裹的黑钨矿，以及固体H ₂ WO ₄覆盖在黑钨矿颗粒上的层，是消化不完全的关键因素。这项工作有可能开发一种绕过碱浸过程从黑钨矿精矿中提取钨的新技术。