Abstract

The chemical and physicochemical characteristics of brown coals from the Arkhara–Boguchan deposit were studied. These coals have increased ash content (to 18.7%) and high aluminum and silicon contents (to 30.5 and to 69.5%, respectively) and the main petrographic components—vitrinite (42%) and semivitrinite (46%). Separate combustion products (slag, fly ash, and sludge) were obtained by burning a bulk sample of 270 kg in the Amur Experimental Technological Complex. In the course of this study, the noble metals Au, Ag, and Pt, which were represented by two morphological types, were detected in all of these fractions. The first type of massive lumpy individuals, often with a noticeable treatment in an aqueous medium, was characterized by a high gold content (>80%), sizes from 2.0 × 1.6 to 115.0 × 160.0 μm, and the presence of impurity elements. According to their characteristics (fineness, composition of impurity elements, etc.), they largely reflected the mineral specialization of ore materials in source areas. The second form of the release of noble metals was loose agglomerates consisting of Au and Ag grains with various concentrations in a temperature range of 600–800°C. The ability to concentrate the grains of noble metals of various genetic natures allows one to consider this interval as the initial stage of gold preservation in fly ash from volatilization by a gas stream.

中文翻译：

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Arkhara-Boguchan矿床（阿穆尔河地区）的煤燃烧产物中的贵金属形态特征

摘要

研究了Arkhara–Boguchan矿床中褐煤的化学和物理化学特征。这些煤具有较高的灰分含量（至18.7％）和较高的铝和硅含量（分别至30.5和69.5％）以及主要的岩相成分-镜质体（42％）和半镜质体（46％）。通过在阿穆尔实验技术园区内燃烧270千克的大块样品，获得了单独的燃烧产物（炉渣，粉煤灰和污泥）。在本研究过程中，在所有这些馏分中都检测到了以两种形态类型表示的贵金属Au，Ag和Pt。第一类块状块状个体，通常在水性介质中经过明显处理，其特征是金含量高（> 80％），尺寸从2.0×1.6到115.0×160.0μm，并且存在杂质元素。根据它们的特性（细度，杂质元素的组成等），它们在很大程度上反映了源区矿石材料的矿物专长。贵金属释放的第二种形式是在600-800°C的温度范围内由各种浓度的Au和Ag晶粒组成的疏松附聚物。浓缩具有各种遗传性质的贵金属颗粒的能力使人们可以将这一间隔视为由气流挥发而使粉煤灰中金的保存的初始阶段。贵金属释放的第二种形式是在600-800°C的温度范围内由各种浓度的Au和Ag晶粒组成的疏松附聚物。浓缩各种遗传性质的贵金属晶粒的能力使人们可以将这一间隔视为由气流挥发而使粉煤灰中金的保鲜的初始阶段。贵金属释放的第二种形式是在600-800°C的温度范围内由各种浓度的Au和Ag晶粒组成的疏松附聚物。浓缩具有各种遗传性质的贵金属颗粒的能力使人们可以将这一间隔视为由气流挥发而使粉煤灰中金的保存的初始阶段。