Gas-phase reduction of iron and chrome from chromites

20th International Scientific and Research Conference "Metallurgy: Technologies, Innovation, Quality. Metallurgy-2017"

Zayakin, O.V.^1 ; Zhuchkov, V.I.^1

Institute of Metallurgy, Ural Branch, Russian Academy of Science, 101 Amundsena street, Ekaterinburg

620016, Russia^1

关键词: Chromium carbide;    Chromium reduction;    Consumption rates;    Gas phase reduction;    Gaseous reducing agent;    Reduction process;    Temperature growth;    Thermogravimetric method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/411/1/012032/pdf
DOI  :  10.1088/1757-899X/411/1/012032

来源: IOP

【 摘 要 】

This paper focuses on studies of iron and partially chromium gas-phase reduction from chrome ore raw material of the Kempirsay Massif. The studies were carried out using a thermogravimetric method in a CO flow followed by chemical analysis of the samples. It is shown that: depending on the time of the samples exposure at the CO consumption rate 75 m3 / h and the temperature of 1200 ° C, basic reduction processes take place in the first 20 minutes of exposure; with temperature growth from 1000 to 1400 ° C and an exposure time of 20 minutes, the degree of Fe and Cr reduction from the considered samples increases from 13 to 37%. Gaseous reducing agent and low temperatures contribute to a greater reduction of iron rather than chromium. Gaseous CO is a good iron reducing agent (with a small excess it allows to obtain a high degree of iron reduction) and a weak chromium reducing agent (the degree of chromium reduction is 14% with the multiple excess of CO and on condition of the chromium carbides formation).