Abstract

The results are presented for the thermodynamic simulation of reductive roasting of ferromanganese ore with a high phosphorus content in the presence of solid carbon. The simulation has been performed using a TERRA software package. An effect of the process temperature in the range of 950–1300 K at a carbon content amounting to 8.50–8.85 g per 100 g of ore exerted on iron, manganese and phosphorus reduction has been studied. At such parameters of the system, iron can be reduced into the metallic state both by solid carbon and by carbon monoxide CO, whereas manganese can be reduced only to produce manganese oxide MnO. The level of phosphorus reduction depends on the amount of a reducing agent. With the carbon excess in respect to the carbon amount required for the reduction of iron, the entire amount of phosphorus is transferred into metal at a temperature of 1150 K. At a temperature below 1150 K and such amount of carbon, phosphorus cannot be reduced. The process of solid-phase iron reduction from manganese ore with retaining manganese in the oxide phase has been studied under laboratory conditions. Experimental results for the direct reduction of these elements with the use of carbon and those for indirect reduction thereof with the use of carbon monoxide CO are presented. The experiments have been performed using a laboratory Tamman furnace at a temperature of 1000–1300°C and at a holding time of 1 and 3 h. The study results on the phase composition of the reduction products, as well as on the chemical composition of the phases, are considered. It is confirmed that selective solid-phase iron reduction with the use of solid carbon into the metallic state is quite possible. Iron under the studied conditions can be reduced by carbon monoxide CO and is transferred into the magnetic fraction. After the magnetic separation of the products of ore reductive roasting with the use of solid carbon and carbon monoxide CO, the obtained nonmagnetic fraction contains manganese, silicon and calcium oxides. The results of this work could be used for the development of theoretical and technological foundations of the processing of ferromanganese ores that cannot be processed by means of existing technologies.

中文翻译：

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通过还原铁锰矿石确定选择性铁回收的条件

摘要

给出了用于在固态碳存在下高磷铁锰矿还原焙烧的热力学模拟结果。使用TERRA软件包进行了仿真。研究了在每100克矿石中碳含量为8.50-8.85克的过程温度在950-1300 K范围内对铁，锰和磷还原的影响。在该系统的这种参数下，铁可以通过固态碳和一氧化碳CO还原成金属态，而锰只能还原成氧化锰MnO。磷还原的水平取决于还原剂的量。相对于还原铁所需的碳量而言，碳过量了，整个磷的量在1150 K的温度下转移到金属中。在温度低于1150 K的情况下，这样的碳量无法还原磷。在实验室条件下，已经研究了将锰矿保持在氧化物相的状态下从锰矿石中还原固相铁的过程。给出了使用碳直接还原这些元素的实验结果以及使用一氧化碳CO间接还原这些元素的实验结果。实验是使用实验室的Tamman炉在1000–1300°C的温度下以及1和3 h的保持时间下进行的。考虑了关于还原产物的相组成以及相的化学组成的研究结果。可以肯定的是，使用固态碳选择性地将固相铁还原成金属态是很有可能的。在研究的条件下，铁可被一氧化碳CO还原并转移到磁性部分中。在使用固体碳和一氧化碳CO进行矿石还原焙烧产品的磁分离后，获得的非磁性馏分包含锰，硅和钙的氧化物。这项工作的结果可用于发展锰铁矿石加工无法通过现有技术进行加工的理论和技术基础。在使用固体碳和一氧化碳CO进行矿石还原焙烧产品的磁分离后，获得的非磁性馏分包含锰，硅和钙的氧化物。这项工作的结果可用于发展锰铁矿石加工无法通过现有技术进行加工的理论和技术基础。在使用固体碳和一氧化碳CO进行矿石还原焙烧产品的磁分离后，获得的非磁性馏分包含锰，硅和钙的氧化物。这项工作的结果可用于发展锰铁矿石加工无法通过现有技术进行加工的理论和技术基础。