SELECTION FOR THE COMPOSITION OF THE CHARGE WITH MINIMAL HEAT CONSUMPTION FOR SMELTING LOW-PHOSPHORUS SLAG
Processy litʹâ, 2021, Tom 145, №2, p.24-31
DOI:
https://doi.org/10.15407/plit2021.03.024Keywords:
low-phosphorus slag, manganese alloys, thermophysical properties, specific heat capacity, thermal conductivity, heat consumptionAbstract
Received 28.08.2021
UDK 669.15-198’162.1:358.953
The use of modern energy and resource-saving technologies in the ferrous alloy industry is important for increasing the efficiency of manganese alloys production, reducing the material consumption of products and saving raw materials. The work proposes a new approach to optimizing the composition of charge components in the smelting of low-phosphorus slag (LPS) due to the choice of charge materials with low specific heat, and considers the possibility of returning to the production of secondary metal-containing materials as substitutes for expensive and scarce charge components.In particular, the issue of increasing the level of use of secondary materials is especially relevant in connection with the growing requirements for environmental safety of production and environmental protection. In particular, in the smelting of LPS it is proposed to use wastes of coal beneficiation in coke production (CBCP) and wastes of secondary aluminium production (WSAP) instead of quartzite and part of coke in the charge. The dependence of thermophysical properties, such as heat transfer, specific heat capacity and thermal conductivity of charge components for LPS smelting in the temperature range 100–1100 0С on the DTVM-1 unit, in which a complex non-stationary method of heat balance in the sample is used, is investigated. The analysis of these dependences makes it possible to find the optimal composition of the charge with minimum heat capacity in order to save energy and with the maximum thermal conductivity in order to improve the technological characteristics of the charge. In the laboratory, a series of LPS melts was carried out to add 9.2–10.3 % of coke-chemical production wastes to the charge and 3.5–3.8 % of wastes from secondary aluminium production. Metallographic studies of samples of low-phosphorus slag from the outer part of the garnish (without lining) showed that LPS consists of rounded grains of manganosite with silicate components.
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