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首页> 外文会议>International Biohydrometallurgy Symposium, IBS-2001 Sep 16-19, 2001, Ouro Preto, Minas Gerais, Brazil >Experimental study of corrosion of two stainless steels during the oxidative bacterial dissolution of chalcopyrite using mass loss and electrochemical techniques
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Experimental study of corrosion of two stainless steels during the oxidative bacterial dissolution of chalcopyrite using mass loss and electrochemical techniques

机译：利用质量损失和电化学技术研究黄铜矿氧化细菌溶解过程中两种不锈钢腐蚀的实验

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Corrosion problems have been encountered in reactors used in pilot plants for the development of different bacterial leaching (bioleaching) processes. A large part of this corrosion is attributable to bacterial activity, i.e. biocorrosion, and basic information is needed for a better understanding and control of this phenomenon. The bioleaching solution associated with the presence of bacteria is highly acidic and requires the use of highly corrosion resistant steel. The selection of materials for the manufacture of industrial bioleaching reactors is difficult and random. Consequently, it is now essential to study the behavior of selected stainless steels during bioleaching in order to determine their potential suitability for industrial use. The main objective of the present study was to compare the respective resistance of two such steels to various types of corrosion and determine which of the steels is most appropriate for manufacturing reactors at industrial scale. The corrosive medium was a solution generated during the bioleaching of a chalcopyrite where a extreme thermophilic bacterial population was used (Sulfolobus-like organisms). The cultures were maintained at a temperature of 78℃, agitated by a propeller and aerated by air injection. Metal coupons and electrodes were made out of two grades of stainless steel (American Iron and Steel Institute (AISI) 304L and 316L) and their corrosion during their immersion in the bioleaching solution was monitored by methods based on the weight loss of the coupons and on the electrochemical behavior of the stainless steel electrodes. By combining the weight loss and electrochemical results, it has been possible to show that i) the two stainless steels behave slightly differently and not very satisfactorily, with a corrosion-erosion rate of more than 50 mm/yr, ii) the samples left for less than one month in the corrosive-erosive medium were not affected seriously by localized corrosion, iii) the AISI 316L grade would appear to be slightly nobler, and this fact gives a slight choice for the construction of industrial bioleaching reactors.
机译：在中试工厂用于开发不同细菌浸出（生物浸出）工艺的反应器中已经遇到腐蚀问题。这种腐蚀的很大一部分归因于细菌活性，即生物腐蚀，需要基本信息以更好地理解和控制这种现象。与细菌存在有关的生物浸出溶液是高酸性的，需要使用高度耐腐蚀的钢。用于制造工业生物浸出反应器的材料的选择是困难且随机的。因此，现在有必要研究生物浸出过程中所选不锈钢的行为，以确定其潜在的工业用途。本研究的主要目的是比较两种这种钢对各种类型腐蚀的抵抗力，并确定哪种钢最适合工业规模的反应器制造。腐蚀性介质是在黄铜矿的生物浸出过程中产生的溶液，其中使用了极端嗜热的细菌种群（类似硫磺菌的生物）。将培养物保持在78℃的温度下，通过螺旋桨搅拌并通过空气注入充气。金属试样和电极由两种等级的不锈钢制成（美国钢铁协会（AISI）304L和316L），并根据试样的重量损失和不锈钢电极的电化学行为。通过将重量损失和电化学结果结合起来，有可能表明：i）两种不锈钢的性能略有不同，但不是很令人满意，腐蚀腐蚀速率大于50 mm / yr，ii）剩下的样品用于在腐蚀性侵蚀介质中不到一个月的时间不会受到局部腐蚀的严重影响； iii）AISI 316L等级似乎稍高一些，这一事实为工业生物浸出反应器的建造提供了一些选择。

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