Activity magnesium-rich pellet for blast furnace

Abstract

The invention discloses an activity magnesium-rich pellet for a blast furnace. An oblate magnesium pellet is formed by evenly mixing 75-90 percent by weight of light roasting magnesium powder, 1-10 percent by weight of binding agent, 2-15 percent by weight of bone substance agent and 2-15 percent by weight of water and is pressed by mechanical force. A majority of raw materials of the activity magnesium-rich pellet is subjected to roasting and grinding treatments and directly enter a blast furnace slagging region so that energy consumption of blast furnace smelting can not be caused, and after entering a soft melting zone region, the raw materials are in a smelting state with charging mines, so that the smooth operation of the blast furnace and the flowability of the slag are ensured, and the yield and the quality of the blast furnace are improved. The activity magnesium-rich pellet for the blast furnace has the advantages of no increasing heat energy consumption, releasing blast-furnace windage resistance, being more beneficial to the smooth production of the blast furnace, providing beneficial conditions for yield and effect increase and combustion reduction of the blast furnace, eliminating the bad influence of blast furnace production caused by Al2O3 in the slag, improving the flowability of the slag and the desulfuration capability, and reducing the coke ratio and the cost of the charging raw material.

Description

Active high magnesium balls for blast furnace technical field The invention relates to a filler used in an iron-making blast furnace, in particular to a blast furnace active magnesium ball formed by mechanical force pressing of high-grade magnesium oxide powder, bone agent, binder and the like. Background technique The long-term stable and smooth production of the blast furnace is closely related to the performance of the blast furnace slag, and the performance of the slag is affected by many factors, the most important of which should be the composition of the slag. In recent years, the low-cost foreign ore in the ore blending of domestic iron and steel enterprises has increased year by year, which has greatly increased the Al2O3 content in blast furnace slag, exceeding the normal requirements of blast furnace operation, resulting in difficulties in blast furnace operation and abnormal furnace conditions. And with the further improvement of pig iron quality requirements, ...

AI Technical Summary

Problems solved by technology

The magnesium oxide content in the blast furnace slag of most iron and steel enterprises in China is directly determined by the magnesium oxide content of the sinter. If the requirements for the magnesium oxide content of the blast furnace are to be met, the quality of the finished product of the sintered ore cannot be guaranteed, and the productivity of the sintering machine will be greatly reduced.

If the traditional method is adopted—dolomite or magnesite (mainly composed of calcium carbonate and magnesium carbonate) is directly put into the blast furnace, the carbon dioxide generated during the thermal decomposition process of the incidental carbonate will cause the utilization rate of chemical energy of the gas to increase. reduced carbon efficiency, increased direct reduction rate, and significantly increased coke ratio, and the strength of dolomite or magnesite after light burning is low, and it is easy to pulverize prematurely, which makes the air permeability of the blast furnace worse, resulting in blast furnace conditions out of order