The fluorine-containing iron ore sintering technology advances in the process of change several large technical measures to sinter production, quality brings. After continuous technical research and production research, at present, there is no difficulty in using sinter in a large number of blast furnaces. Most of the technical and economic indicators of sintering are close to the level of domestic ordinary mines. Summarizing the progress of more than 30 years, I have the following experience:
(1) The progress of fluorine-containing ore sintering technology is a scientific experiment process that continuously understands the quality of iron concentrate and continuously adjusts the composition, structure and performance of sintered ore. It is a difficult history of scientific and technological research. This process has not yet ended.
(2) a fluorine-containing ore in the sintering technique, in terms of production and sintered in the early blast furnace, to improve the strength of sintered ore is the core; basically solved the problem in strength, blast furnace to further improve production levels, improve the sintering properties of Gold Mining It has become the core of the problem. There is a unity and contradiction between strength and performance. Throughout the process, comprehensively solving these two problems can further improve the production level of blast furnace.
(3) Utilizing some external resources - ordinary mines are effective measures to alleviate the special characteristics of fluorine-containing minerals and protect rare earth resources, and should be adhered to.
(4) The quality of the sintered ore is determined by the mineral composition and structure of the sintered ore. The physicochemical properties of the bonded phase and its combination with the iron mineral are determined by the chemical composition and process conditions of the sintered ore. Fluorine is the main factor affecting the quality of sinter. Potassium and sodium not only affect the quality of sinter but also have a great destructive effect on circulation and accumulation in blast furnace. High alkalinity, high magnesium oxide, sintered silicon low, measures such thick layers is also important for the fluorine-containing sintering. The adjustment of alkalinity is the most sensitive factor affecting the quality of sinter, and it is also the main means of regulation. However, there are some problems that require special measures, such as the problem of soft-melting gas permeability of fluorine-containing sinter can only be solved at a lower alkalinity; for example, magnesium oxide can not only improve the quality of sintered ore, but also improve the performance of fluorine-containing slag (including platoons). Alkali ability) has a special effect on improving fluorine, potassium and sodium smelting.
(5) The sintering process of Baotou Steel and the blast furnace process once again show that “fine material is the basis of smelting of blast furnaceâ€. The quality of sintering not only affects the charge itself, but also affects the slagging and the entire smelting process. Every major advancement in Baogang's sintering has created conditions for the advancement of blast furnace smelting, and the demand for raw materials in the advancement of blast furnaces has driven the technological advancement of sintering. The progress of smelting smelting in Baotou Steel is closely related to the technological progress of sintering. The trade-off of sintering technology measures is not only considered in the sintering itself but more importantly determined by the final result of blast furnace smelting.
Although the progress of fluorine-containing iron ore sintering technology has made great progress, the particularity of fluorine-containing ore still exists; the fluorine content of iron concentrate is still as high as 0.7%, the alkali load of the charge is still as high as 6kg/t (iron), and the main sintering The index is lower than the national average, and the problem of high cost of sintering and iron making is becoming increasingly acute. There are also new topics in the progress of fluorine-containing ore sintering technology:
(1) The goal of developing a new generation of high-quality sinter is not fully realized. Low-silicon high-alkalinity sinter has obvious advantages and has insurmountable shortcomings. The ongoing industrial test for adjusting alkalinity is not over yet. Exploring the combination of good soft-melt permeability and particle size composition, and high-quality sinter with better comprehensive performance, the work of forming a more reasonable charge structure is underway.
(2) Due to the large difference in composition and chemical composition of fluorine-containing iron ore, the problem of large fluctuations in iron concentrate, sinter composition and performance requires greater attention and input to provide highly stable production conditions for the blast furnace.
(3) There is still a big gap between the consumption of sintered solid fuel, the utilization coefficient of sintering machine and some quality indicators compared with the domestic advanced level. The task of production technology research is still arduous.
Solving these problems will make it possible to achieve the domestic advanced level of fluorine-containing iron ore sintering and iron making.
(1) The progress of fluorine-containing ore sintering technology is a scientific experiment process that continuously understands the quality of iron concentrate and continuously adjusts the composition, structure and performance of sintered ore. It is a difficult history of scientific and technological research. This process has not yet ended.
(2) a fluorine-containing ore in the sintering technique, in terms of production and sintered in the early blast furnace, to improve the strength of sintered ore is the core; basically solved the problem in strength, blast furnace to further improve production levels, improve the sintering properties of Gold Mining It has become the core of the problem. There is a unity and contradiction between strength and performance. Throughout the process, comprehensively solving these two problems can further improve the production level of blast furnace.
(3) Utilizing some external resources - ordinary mines are effective measures to alleviate the special characteristics of fluorine-containing minerals and protect rare earth resources, and should be adhered to.
(4) The quality of the sintered ore is determined by the mineral composition and structure of the sintered ore. The physicochemical properties of the bonded phase and its combination with the iron mineral are determined by the chemical composition and process conditions of the sintered ore. Fluorine is the main factor affecting the quality of sinter. Potassium and sodium not only affect the quality of sinter but also have a great destructive effect on circulation and accumulation in blast furnace. High alkalinity, high magnesium oxide, sintered silicon low, measures such thick layers is also important for the fluorine-containing sintering. The adjustment of alkalinity is the most sensitive factor affecting the quality of sinter, and it is also the main means of regulation. However, there are some problems that require special measures, such as the problem of soft-melting gas permeability of fluorine-containing sinter can only be solved at a lower alkalinity; for example, magnesium oxide can not only improve the quality of sintered ore, but also improve the performance of fluorine-containing slag (including platoons). Alkali ability) has a special effect on improving fluorine, potassium and sodium smelting.
(5) The sintering process of Baotou Steel and the blast furnace process once again show that “fine material is the basis of smelting of blast furnaceâ€. The quality of sintering not only affects the charge itself, but also affects the slagging and the entire smelting process. Every major advancement in Baogang's sintering has created conditions for the advancement of blast furnace smelting, and the demand for raw materials in the advancement of blast furnaces has driven the technological advancement of sintering. The progress of smelting smelting in Baotou Steel is closely related to the technological progress of sintering. The trade-off of sintering technology measures is not only considered in the sintering itself but more importantly determined by the final result of blast furnace smelting.
Although the progress of fluorine-containing iron ore sintering technology has made great progress, the particularity of fluorine-containing ore still exists; the fluorine content of iron concentrate is still as high as 0.7%, the alkali load of the charge is still as high as 6kg/t (iron), and the main sintering The index is lower than the national average, and the problem of high cost of sintering and iron making is becoming increasingly acute. There are also new topics in the progress of fluorine-containing ore sintering technology:
(1) The goal of developing a new generation of high-quality sinter is not fully realized. Low-silicon high-alkalinity sinter has obvious advantages and has insurmountable shortcomings. The ongoing industrial test for adjusting alkalinity is not over yet. Exploring the combination of good soft-melt permeability and particle size composition, and high-quality sinter with better comprehensive performance, the work of forming a more reasonable charge structure is underway.
(2) Due to the large difference in composition and chemical composition of fluorine-containing iron ore, the problem of large fluctuations in iron concentrate, sinter composition and performance requires greater attention and input to provide highly stable production conditions for the blast furnace.
(3) There is still a big gap between the consumption of sintered solid fuel, the utilization coefficient of sintering machine and some quality indicators compared with the domestic advanced level. The task of production technology research is still arduous.
Solving these problems will make it possible to achieve the domestic advanced level of fluorine-containing iron ore sintering and iron making.
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