One of the cheapest methods of extracting gold is heap leaching. However, the recovery of gold by this method is relatively low, compared with cyanidation of the crushed material, so the search for the ways to intensify leaching and increase gold recovery is an urgent task. Investigations on heap leaching of gold from the gold-bearing ore of the Sari Gunay deposit were conducted using a promising reagent sodium acetate to intensify the heap leaching process. The results of assay-gravimetric, chemical, mineralogical and granulometric analyses of oxidized ore are presented. The average gold content in the ore was 2.90 g/t. According to the electron probe analysis, gold in the ore is present in the form of fine (micron) inclusions in minerals and ore rocks. Comparative studies on heap leaching of gold from the crushed ore with a grain size of –20 + 0 mm with the addition of sodium acetate and without that were carried out. The degree of gold recovery with sodium acetate at a flow rate of 0.5 kg/t was 58.74%, that without sodium acetate was 54.69%, i.e. the addition of the reagent provides an increase in recovery of more than 4%. Leaching with the addition of the reagent also reduces sodium cyanide consumption from 0.65 to 0.59 kg/t. The research results have shown that sodium acetate can be used to intensify the process of heap leaching of gold when the ore size is –20+0 mm.
Over the past century, many problems have been focused on the problems of low leaching rate of gold and methods have been developed to intensify the leaching of gold. Among these methods, the use of hydrogen peroxide to accelerate the leaching of gold is known. In order to intensify the leaching process, the indicators of cyanide leaching of gold from ore using hydrogen peroxide were studied. This article presents the results of assay-gravimetric, chemical, and mineralogical analyses of gold-bearing ore from the Sari Gunay Deposit (Iran). The content of sulfide sulfur ore belongs to the category of low-sulphide, by oxidation of sulphur (50.70%) to the category of oxidized ores. Thermodynamic analysis of possible reactions of ore components with hydrogen peroxide is carried out. Laboratory studies on cyanide leaching of gold have shown that the maximum recovery of gold is 52.92% at a concentration of hydrogen peroxide of 0.5%, the recovery of gold without ore treatment is 52.03%. The results of laboratory and column tests with and without treatment with hydrogen peroxide (H2O2–0.5%) were compared. Treatment of gold-bearing ore with hydrogen peroxide during heap leaching of gold increases gold recovery by 1.2% and amounts to 55.89%, without treatment - 54.69%. This increases the consumption of sodium cyanide by 0.04 kg/t.
Абстракт. Интенсификация добычи металла выщелачиванием-это проведение комплекса организационно-технических мероприятий, направленных на достижение наиболее быстрого и полного извлечения металла из руды. Мероприятия по интенсификации выщелачивания направлены на полную или частичную нейтрализацию причин, вызывающих снижение скорости выщелачивания. Проведены испытания по цианидному выщелачиванию золота из золотосодержащей руды с добавкой ацетата натрия для интенсификации процесса выщелачивания. Представлены результаты пробирно-гравиметрического, химического, минералогического и гранулометрического анализа окисленной руды. По данным электроннозондового анализа золото в руде присутствует в виде тонких (микронных) включений в минералах и рудных пород. Проведено исследование по выщелачиванию измельченной руды крупностью 90% класса-0,074 мм и дробленной руды крупностью-12+0 мм. Выщелачивание измельченной руды крупностью 90% класса-0,074 мм показало, что при добавлении ацетата натрия степень извлечения золота увеличивается на 1,13 % по сравнению с выщелачиванием без добавления данного реагента. При выщелачивании дробленой руды крупностью-12+0 мм с добавкой ацетата извлечение золота увеличивается в среднем на 4 %, и улучшается кинетика растворения золота. Данные исследований доказывают, что ацетат натрия можно использовать для интенсификации золота при крупности руды-12+0 мм и в более крупных классах руды для выщелачивания золота. Ключевые слова: интенсификация процесса выщелачивания, ацетат натрия, выщелачивание, кучное выщелачивание, золото, химический реагент.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.