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首页> 外文期刊>Minerals Engineering >Reduction of preg-robbing activity of carbonaceous gold ores with the utilization of surface blinding additives
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Reduction of preg-robbing activity of carbonaceous gold ores with the utilization of surface blinding additives

机译：用表面致盲添加剂的利用率降低碳质金矿石的抢劫活性

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摘要

The carbonaceous matter present in some gold ores adsorbs the gold cyanide complexes from the leached solution and transport them to tailings, resulting in loses and preventing the recovery of the metal - a phenomenon known as preg-robbing. The present work aims at evaluating the capacity of 8 blinding additives to deactivate/passivate the carbonaceous matter present in mineral coals and in gold ores. Initially, adsorption experiments with 3 mineral coals at different levels of maturation (anthracite, bituminous and lignite) were carried out to simulate the complex carbonaceous matrix of the gold ores. The coal presenting the best adsorptive capacity was selected for the experiments with the blinding additives. Different concentrations of additives (562-28,125 g/t(coal)) and conditioning times (5, 30 and 120 min) were investigated. The blinding additives presenting satisfactory results were used in the deactivation/passivation carbonaceous gold ore experiments. Adsorption experiments showed that the anthracite coal adsorbed gold cyanide while bituminous and lignite coal failed to do so. It is believed that the difference in the adsorptive capacity presented by the mineral coals owes to the structure of the carbonaceous material, and also that the anthracite coal structure is similar to what is found in the carbonaceous gold ores presenting preg-robbing activity. The deactivation/passivation experiments indicated that the additives A1, A2, A3, A4 and A5 suppressed the adsorptive capacity of the anthracite by 60-85% in concentrations varying from 562 to 28,125 g/t(coal) respectively. The additive presenting the best performance was A2. Experiments with a carbonaceous gold ore indicated that the use of 350 and 1000 g/t(goal) (ore) of additive Al presented the best recoveries, 90.12 and 90.69%, resulting in the lowest presence of gold contents in the tailings, 1.17 and 1.25 g/t respectively. These values are very close to what was reported for CIL leaching (89.89% and 1.30 g/t) and considerably higher than values observed in the conventional leaching (83.79% and 2.10 g/t). Despite presenting the best deactivation/passivation performance when used with the anthracite coal, additive A2 did not reduce the preg-robbing activity of the carbonaceous matter of the ore, resulting in an increase in gold content in the tailing. The use of additives in the industrial process will demand a simpler and less expensive operational facility and the performance will be similar to the CIL technique.
机译：一些金矿中存在的碳质物质从浸出的溶液中吸附金氰化物复合物并将它们运送到尾矿，导致损伤并防止金属的回收 - 一种称为Preg-Robbing的现象。目前的工作旨在评估8个致盲添加剂的能力，使矿物煤和金矿中存在的碳质物质存在/钝化。最初，进行了在不同成熟水平（无烟煤，沥青和褐煤）的3种矿物煤的吸附实验，以模拟金矿的复杂碳质基质。选择具有最佳吸附能力的煤进行致盲添加剂的实验。研究了不同浓度的添加剂（562-28,125g / t（煤））和调理时间（5,30和120分钟）。呈现令人满意的结果的致盲添加剂用于停用/钝化碳质金矿石实验中。吸附实验表明，无烟煤吸附金氰化物，而沥青和褐煤煤未能这样做。据信，矿物煤所呈现的吸附能力归因于碳质材料的结构，以及含有无烟煤结构类似于呈现Preg-Robbing活性的碳质金矿中的发现。去激活/钝化实验表明，添加剂A1，A2，A3，A4和A5分别将无烟煤的吸附容量抑制了60-85％，分别从562-28,25g / t（煤）变化。呈现最佳性能的添加剂是A2。碳质金矿石的实验表明，使用350和1000g / t（靶）（矿物）的添加剂Al呈现最佳回收率，90.12和90.69％，导致尾矿中的金含量最低，1.17和分别为1.25克/吨。这些值非常接近报告的CIL浸出（89.89％和1.30g / t），并且在常规浸出中观察到的值相当高（83.79％和2.10g / t）。尽管在与无烟煤煤一起使用时呈现最佳停用/钝化性能，但添加剂A2没有减少矿石的碳质物质的Preg-Robbing活性，导致拖尾的金含量增加。在工业过程中使用添加剂将需要更简单，更便宜的运营设施，性能与CIL技术类似。

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