This study examines the impact of regrinding on the interfacial properties of sulfide minerals and the flotation performance of weathered copper–porphyry tailings. The feed material is characterized by a low copper grade (0.17%) and a high proportion of oxidized species (53.84%), which contribute to its inherent chemical stability and poor flotation kinetics. The findings indicate that regrinding serves a dual role: facilitating the liberation of mineral intergrowths and inducing mechanical surface renewal. This renewal is characterized by a significant decrease in the oxidation–reduction potential (ORP) and an intensification of the surface reactivity. Experimental results identify an optimal grinding fineness of 77%–81% passing −0.045 mm, yielding a copper recovery of 16.26% in the absence of a sulfidizing agent. The integration of sodium sulfide (400 g/t) with regrinding significantly enhances recovery to 36.37%, driven by the establishment of a reducing environment (ORP ≈ −150 mV) and the chemisorption-mediated activation of mineral surfaces. While ultrafine grinding (90%–100% passing −0.045 mm) further increases recovery to 51.47%, it is accompanied by deleterious sliming effects and a subsequent loss of process selectivity. The study confirms that mechanical surface rejuvenation and the optimization of electrochemical conditions are critical for improving the processing efficiency of anthropogenic resources, providing a theoretical framework for establishing rational beneficiation regimes.

This study examines the impact of regrinding on the interfacial properties of sulfide minerals and the flotation performance of weathered copper-porphyry tailings. The feed material is characterized by a low copper grade (0.17%) and a high proportion of oxidized species (53.84%), which contributes to its inherent chemical stability and poor flotation kinetics. The findings indicate that regrinding serves a dual role: facilitating the liberation of mineral intergrowths and inducing mechanical surface renewal. This renewal is characterized by a significant decrease in the oxidation-reduction potential (ORP) and an intensification of the surface reactivity. Experimental results identify an optimal grinding fineness of 77-81% passing -0.045 mm, yielding a copper recovery of 16.26% in the absence of a sulfidizing agent. The integration of sodium sulfide (400 g/t) with regrinding significantly enhances recovery to 36.37%, driven by the establishment of a reducing environment (ORP ≈ -150 mV) and the chemisorption-mediated activation of mineral surfaces. While ultrafine grinding (90-100% passing -0.045 mm) further increases recovery to 51.47%, it is accompanied by deleterious sliming effects and a subsequent loss of process selectivity. The study confirms that mechanical surface rejuvenation and the optimization of electrochemical conditions are critical for improving the processing efficiency of anthropogenic resources. providing a theoretical framework for establishing rational beneficiation regimes.

На фоне истощения богатых природных рудных источников и ужесточения экологических требований переработка техногенных отходов, в том числе лежалых хвостов, приобретает все большую значимость. Разработка эффективных методов селективного извлечения меди из окисленных минеральных форм представляет собой важную задачу, поскольку традиционные флотационные схемы обладают низкой эффективностью при переработке окисленных руд. В статье приведены результаты испытаний по применению селективного реагента в сочетании с ксантогенатом (слабым и сильным собирателем) для обогащения окисленной части медных хвостов. Исследования проведены на окисленной части лежалых хвостов с содержанием меди 0,142% со степенью окисленности 65,49%. В ходе экспериментов была определена оптимальная доза реагента и условия флотации, обеспечивающие повышение извлечения меди до 38,56% Бай табиғи кен көздерінің сарқылуы және экологиялық талаптардың күшеюі жағдайында техногендік қалдықтарды, оның ішінде ұзақ уақыт жатып қалған қалдықтарды, қайта өңдеу қазіргі таңда өзекті мәселенің бірі. Тотыққан минералды формалардан мысты бөліп алудың тиімді әдістерін әзірлеу маңызды, себебі дәстүрлі флотациялық тәсілдер тотыққан кендерді өңдеуде тиімсіз. Мақалада мыс қалдықтарының тотыққан бөлігіне селективті реагент пен ксантогенаттықолдану бойынша зерттеу нәтижелері ұсынылған. Зерттеулер мыс мөлшері 0,142%, тотығу дәрежесі 65,49% болатын қалдықтардың сынамасында жүргізілді. Эксперименттер барысында реагенттің оңтайлы дозасы және флотацияның тиімді шарттары анықталды. Анықталған параметрлер негізінде мысты бөліп алу көрсеткіші 38,56%-ға дейін жоғарылады Against the background of the depletion of high-grade natural ore resources and the tightening of environmental regulations, the processing of technogenic waste, including long-term accumulated tailings, is gaining increasing importance. Developing efficient methods for the selective recovery of copper from oxidized mineral forms remains a critical challenge, as conventional flotation schemes show low efficiency when treating oxidized ores. This paper presents the results of a study on the effect of combining a selective reagent with a xanthate (weak and strong collectors) on the oxidized fraction of copper-bearing tailings. The research was conducted on the oxidized portion of tailings containing 0.142% copper with an oxidation degree of 65.49%. During the experiments, the optimal reagent dosage and flotation conditions were determined, which enabled an increase in copper recovery up to 38.56%