Abstract
The article presents research data on manufacturing and application of metalized ore-coal pellets in synthetic pig iron smelting. A technology of pellets metallization by means of solid-phase reduction of iron from oxides using hematite-magnetite iron ore and low-caking coal as raw materials is described. Industrial testing of replacing 10, 15, and 20% of waste metal by the metalized ore-coal pellets in the coreless induction furnace IST-1 is described. Optimal temperature and time conditions of feeding the metalized pellets into the furnace in smelting pig iron of SCh-40-60 grade are determined.
Highlights
Iron and steel companies suffer from a scarcity of burden materials and they have to find new sources of raw materials
Characteristics of conventional smelting using metalized ore-coal pellets in the furnace charge are shown in table 5
The experiments show that when batches of pellets are fed into the melting pot filled with melted metal to 60%, the pellets are entrained deep into the melting bath (Figure 3)
Summary
Iron and steel companies suffer from a scarcity of burden materials and they have to find new sources of raw materials. The use of natural gas provides obtaining materials with high percentage of metallic iron (more than 85%) and low percentage of gangue material. In this process, gas consumption is as high as 300 – 400 m3 per a ton of the metalized material. There are a number of researches focusing on solid-phase reduction of iron from oxides using coal but a commonly accepted scientifically based technology has not been developed. Conditions of induction smelting are good for the use of metalized materials containing solid carbon which in its turn can take part in postreduction of iron oxides and act as a carburizing agent. Development of a technique for using metalized ore-coal pellets in induction smelting is an important task for researchers
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