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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Optimization of partial extraction chemistry for buffered acetate and hydroxylamine leaches
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Optimization of partial extraction chemistry for buffered acetate and hydroxylamine leaches

机译：缓冲乙酸盐和羟胺浸出部分萃取化学的优化

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摘要

The reaction conditions chosen for most partial geochemical extractions remain largely unjustified in terms of optimizing their ability to isolate element signatures related to the effects of mineralization. This study demonstrates the use of central composite designs to study the effects of variation in temperature, pH and reagent concentrations on metal extraction for a buffered acetate leach and a hydroxylamine leach. These designs have been used on nine soil samples from a traverse over porphyry Cu–Au mineralization in central NSW, Australia. For both leaches, metal extractability varies significantly with reaction conditions and the strongest responses to mineralization are generally provided under a very restricted range of digestion conditions. The optimum extraction conditions at Mandamah for the acetate leach are the low pH of the acetate buffer (3.76) and a high acetate concentration at any temperature. The optimum conditions at Mandamah for the hydroxylamine leach are pH = 0, T = 100°C and a moderate to high hydroxylamine concentration (although not for its ability to reduce metal oxides).
机译：就优化 其分离与矿化作用有关的元素特征的能力而言，大多数局部地球化学 提取所选择的反应条件在很大程度上仍然是不合理的。这项研究表明使用中心 复合材料设计研究温度， pH和试剂浓度变化对缓冲液 乙酸盐的金属萃取的影响浸出和羟胺浸出。这些设计已用于澳大利亚新南威尔士州中部斑岩型铜矿中的9个土壤样品的 。对于两种 浸出物，金属的可萃取性随反应 条件而显着变化，并且通常在非常有限的消化范围内提供对矿化的最强响应 > 条件。在Mandamah中，对于 乙酸盐浸出的最佳提取条件是乙酸盐缓冲液的pH低（3.76） ，并且在任何温度下乙酸盐浓度都很高。 Mandamah中羟胺浸出的最佳 条件为pH = 0，T = 100°C和中等至高浓度的羟胺 （尽管不是还原金属氧化物的能力）。

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  • 来源
    《Geochemistry: Exploration, Environment, Analysis》 |2005年第3期|00000279-00000285|共7页
  • 作者

    I.J. Dalrymple; D.R. Cohen; S.G. Gatehouse;

  • 作者单位

    School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2035, Australia|CSIRO Exploration and Mining, North Ryde, NSW 2121, Australia;

    School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2035, Australia;

    School of Biological, Earth and Environmental Sciences, University of New South Wales, NSW 2035, Australia|Hellman & Schofield Pty Ltd, 6/3 Trelawney Sreet, Eastwood, NSW 2122, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    selective extraction; geochemical exploration; Mandamah; central composite design;

    机译：选择性提取;地球化学勘探;曼达玛中央复合设计;

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