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High-alumina slag system for blast furnace smelting

A blast furnace smelting and high-aluminum slag technology, which is applied in the field of iron and steel metallurgy and ironmaking, can solve the problems of increased fuel ratio, large slag amount, and comprehensive smelting cost in blast furnace smelting, and achieves the effect of increasing the utilization ratio.

Inactive Publication Date: 2015-01-07
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology

However, it is difficult to use low-cost high-aluminum ore in such a way of "diluting aluminum content" in large quantities, and it will lead to low comprehensive iron grade and large slag content of blast furnace raw materials, which will increase the fuel ratio of blast furnace smelting and increase the comprehensive smelting cost. high

Method used

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  • High-alumina slag system for blast furnace smelting
  • High-alumina slag system for blast furnace smelting
  • High-alumina slag system for blast furnace smelting

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Embodiment

[0031] Using the same blast furnace conditions, during the normal smelting of the blast furnace 2 o 3 Generation of SiO 2 "High aluminum slag system (see Table 1) and increasing Al while maintaining the traditional binary alkalinity 2 o 3 Carry out experiment at the slag system (seeing table 2) of different percentages, measure the viscosity under different temperatures, draw temperature-viscosity figure, respectively as Figure 5 and Figure 6 shown, from Figure 5 It can be seen that, with the Al in the slag 2 o 3 As the content increases, the viscosity of the slag in the high temperature zone is basically the same as that of the normal production blast furnace. From Figure 6 It can be seen that in the slag Al 2 o 3 When 2 o 3 = 24% when the viscosity-temperature curve appears an inflection point, 24%2 o 3 In the range of 2 o 3 An increase in the content will cause the viscosity of the slag to be too high and make the operation of the blast furnace difficult, w...

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Abstract

The invention discloses a high-alumina slag system for blast furnace smelting. The high-alumina slag system comprises the following components by mass percent: 20 to 32 percent of SiO2, 38 to 40 percent of CaO, 18 to 30 percent of Al2O3, 7 to 11 percent of MgO, and 0.5 to 1 percent of TiO2. The high-alumina slag system creatively utilizes the effect of Al2O3 in the slag system on the premise that the performance requirements of a blast furnace smelting slag system are met, takes Al2O3 to replace SiO2 in the existing slag system, meanwhile reduces the content of SiO2, converts aluminosilicate slag for traditional blast furnace smelting into the blast furnace smelting slag system, utilizes the current blast furnace smelting high-alumina mineral matched with other iron mines, can obtain a slag system with Al2O3 content reaching 20 to 30 percent or above, and meets the requirement of the blast furnace smelting slag system.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and ironmaking. Specifically, the invention relates to a high-alumina slag system used in blast furnace smelting. Background technique [0002] With the rise in the price of high-quality ironmaking raw materials, the cost pressure of blast furnace ironmaking has increased sharply, and various cheap materials have been widely used. However, some of these cheap materials cannot be effectively utilized, such as high alumina ore (Al 2 o 3 >5%) are cheap minerals that cannot be used in large quantities under the current technology. This is due to the Al in the final blast furnace slag 2 o 3 The content is low, which has little effect on the metallurgical properties (desulfurization ability, stability and viscosity) of the blast furnace slag. The blast furnace smelting is only based on the binary alkalinity CaO / SiO 2 The metallurgical properties of the final slag can be effectively adjust...

Claims

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Application Information

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IPC IPC(8): C21B5/04
Inventor 梁栋吕学伟周小辉秦立国崔帆张英张炯张毅曾晖李建云王学斌罗霞光石红燕
Owner SHANDONG IRON & STEEL CO LTD
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