The importance of ore raw materials basicity in terms of their comprehensive quality evaluation

2020 METAL 2020 Conference Proeedings   unpublished
Basicity is one of the key chemical criteria in evaluating the properties of ore raw materials. The alkaline character of the blast furnace charge affects the efficiency of the iron production process in the blast furnace. The basicity of the raw ore material also affects the cost of the process, which may require additional basic additives. However, raw ore materials can be evaluated according to a range of criteria, which may be physical, chemical, economic or technological in character. In
more » ... ch category, many other criteria can be identified. Metallurgical companies have long endured problems in selecting suitable raw ore types and other input sources. Complications generally arise because of the wide spectrum of criteria, but also their varying character, which is difficult to uniformly assess. The range of criteria can be evaluated in categorically different units, which is then difficult to compare at an overall level. The significance and influence of basicity in relation to other key criteria in assessing ores was experimentally assessed in this research. The overall quality of the selected ores was also assessed under this task. Ore quality was analysed according to key criteria, which vary in character. Research was conducted at the company TŘINECKÉ ŽELEZÁRNY, a.s. The article discusses the results of research on the significance of basicity in the assessment criteria structure for ores and demonstrates the possibility of assessing ores using mathematical tools. 1. (6) Alkalinity can then be assessed for any input raw material. It is critical that the overall ratio of alkaline and acidic components is at least equal. In terms of the produced blast furnace slag, alkalinity values fall in the interval 0.8-1.2. The content of alkaline and acidic components themselves, which were given as CaO, MgO, SiO2, and Al2O3, constitute the overall slag content 94-96% [4], [5] . EXPERIMENTAL WORK The research conducted at the company TŘINECKÉ ŽELEZÁRNY, a.s., assessed the significance of basicity according to a defined set of criteria. At the same time, the overall quality of three selected ores was evaluated. The raw ore materials originated from the Kursk, Krivoy Rog, and Kovdor deposits. Six key criteria were selected for the assessment: K1 -Fe content (%) K2 -Basicity (-) K3 -Homogeneity of lumpiness (%) K4 -Moisture content (%) K5 -Reducibility (%) K6 -Strength (%)
doi:10.37904/metal.2020.3644 fatcat:q5gtx3tuuvbzvfsa7ti2sfjwka