Research of metallurgical properties of high-ash coal for the production of ferro-alloys

Abstract

In laboratory conditions researches on studying of metallurgical properties of high-ash reducing agents on the example of stone coals of the Borly Deposit are carried out. Physical and chemical characteristics of the studied coals are determined: strength, density, porosity, electrical resistivity and reactivity. A comparative analysis of the properties of coal with known reducing agents of ferroalloy production: Magnitogorsk and Chinese cokes, Angarsk and Leninsk-Kuznetsk semi-coxes. It was found that the studied coals have high values of electrical resistivity and reactivity, providing intensive reduction of oxides of charge materials, as well as contributing to a more complete use of the furnace power. Indications of mechanical strength test coal meet the requirements for carbon-containing raw materials used for the production of ferroalloys according are 50-60%. The main strength characteristic of carbon reducing agents used in the Ferroalloy industry is their structural strength, the values of which should be within 45-55% according. The structural strength of the coal under study is quite high and is 81.35 % and close in value to the Magnitogorsk coke 87.5 %. Indicators of reactivity is of 8.61 ml/g∙s and comparable with the values of Leninsk-Kuznetsk of 8.02 ml/g∙s and the Angarsk 9,80 ml/g∙ s semi-coxes. In general, the metallurgical properties of high-ash Borlin coals are within acceptable limits and fully meet the requirements for reducing agents used in the production of ferroalloys.