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含砷的金矿石常用作熔炼过程中的熔剂或是进行浸出处理以提取金。主要目的是降低被处理物料中的砷含量和碎解矿石晶格 ,并因此而解离出金。为使含砷的化合物在有黄铁矿存在的条件下达到硫化 ,以及在有苏打 (碳酸钠 )存在的条件下使含砷的金矿石和精矿氧化 ,作者已制定出一些工艺规程。本文分析了含砷的金精矿分解和氧化焙烧的实验室和半工业试验的结果。在真空条件下进行分解焙烧过程中 ,砷就以元素砷和硫化物砷形式被挥发。这一处理过程虽能大大减轻对环境的不利影响 ,但却需要采用费用很高的工艺设备。在只有着有限数量氧气的气相中进行焙烧 ,就有可能使砷以氧化物和硫化物形式挥发 ,并且这一过程可在流化床焙烧炉中进行。在存在有碳酸钠的条件下对精矿进行氧化焙烧时 ,就能生成一些水溶性的化合物 ,并能使所有的砷和硫实际上都留在焙砂中
Arsenic-bearing gold ore is commonly used as a flux in the melting process or leaching to extract gold. The main purpose is to reduce the arsenic content in the material being processed and to disintegrate the ore lattice and thus to dissociate the gold. In order to achieve sulfurization of arsenic-containing compounds in the presence of pyrite and the oxidation of arsenic-bearing gold ores and concentrates in the presence of soda (sodium carbonate), the authors have developed a number of procedures. This article analyzes the results of laboratory and semi-industrial tests of the decomposition and oxidation roasting of arsenic-bearing gold concentrates. Arsenic is volatilized as elemental arsenic and sulfide arsenic during calcination under vacuum. Although this process can greatly reduce the negative impact on the environment, but it requires the use of expensive process equipment. It is possible to volatilize arsenic in the form of oxides and sulfides by firing in the gas phase with only a limited amount of oxygen, and this process can be carried out in a fluidized bed roaster. When the concentrate is oxidatively roasted in the presence of sodium carbonate, some water-soluble compounds are produced and all of the arsenic and sulfur are actually retained in the calcine