Comprehensive sintering method of large-proportion limonite

Abstract

The invention provides a comprehensive sintering method of large-proportion limonite. The comprehensive sintering method of large-proportion limonite is characterized by comprising the following stepsof (1) preparing the following materials in a mass ratio: 60-75% of limonite powder, 5-10% of imported ore powder, 5-15% of iron ore concentrate powder, 2-5% of dolomite, 2-5% of limestone, 3-5% of quick lime, 5-8% of coke powder and 0-10% of sintered ore minus sieve powder, wherein the total percentage of the components is 100%, and controlling alkalinity to be 1.60-2.0; (2) performing materialmixing for the first time, and controlling moisture to be 5.0-8.5%; (3) performing material mixing for the second time, and controlling moisture to be 6.0-9.5%; (4) performing material distribution: laying bottom materials of which the thickness is 20mm, then laying a sintering material layer of which the thickness is 730-860mm, performing material pressing at edges, and performing water sprayingfor humidifying; and (5) performing sintering so as to obtain sintered ore. Hazardous elements of S and P are effectively reduced, and under the situation of realizing sintering of the large-proportion limonite, fully utilizing limonite resources and reducing cost, high-quality sintered ore can be obtained.

Description

technical field [0001] The invention relates to a sintering method, in particular to a comprehensive sintering method of a large proportion of limonite, belonging to the technical field of fine ore sintering metallurgy. Background technique [0002] The distribution of iron ore resources in the world is characterized by rich iron ore deposits in countries in the southern hemisphere, such as Brazil, Australia, and South Africa, and rich iron ore deposits in countries in the northern hemisphere, such as the former Soviet Union, the United States, Canada, and China. In China, the reserves of magnetite and hematite required for blast furnace smelting are decreasing day by day, and it is imperative to use lean miscellaneous iron ore for blast furnace smelting. [0003] Limonite powder with high crystal water (10-15% of crystal water) has not been fully utilized due to its long-term existence as dull ore, and its preservation is relatively good, with a grade of about 48-55%. Ther...

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Problems solved by technology

[0003] Limonite powder with high crystal water (10-15% of crystal water) has not been fully utilized due to its long-term existence as dull ore, and its preservation is relatively good, with a grade of about 48-55%. There are few harmful elements, the mining cost is low, and the supply is large, continuous and stable, and the price is lower than that of imported ore. However, the large proportion of limonite will cause the deterioration of sintering production, that is, the strength and yield of sintered ore produced by it These are all caused by the properties of highly crystalline hydrolimonite minerals, especially their high porosity and high clay content. Limonite sintering brings three adverse effects: 1) After the crystal water is removed, a large amount of Its existence provides a large number of gas transmission channels, reduces the mineralization time of sintered ore, and reduces the quality of sintered ore; 2) The loose characteristics of limonite body are not suitable for the ball core of sintered mixture; 3 ) The assimilation temperature of limonite is low, and the internal pores will be surrounded by liquid phase without densification during sintering, which deteriorates the output and quality indicators of sintered ore

However, high clay content leads to strong water absorption and easy bonding into lumps, especially in the rainy season, which increases the difficulty of screening and mixing operations, which adversely affects the quality of sinter

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