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A Composite Additive for Improving Low-temperature Reduction Pulverization Performance of Sintered Ore

A composite additive and sintering ore technology, which is applied in the field of iron and steel metallurgy sintering, can solve the problems of poor low-temperature reduction pulverization index, etc., and achieve the goal of reducing the low-temperature reduction pulverization rate, improving the low-temperature reduction pulverization index, and improving the low-temperature reduction pulverization performance Effect

Active Publication Date: 2019-07-19
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite additive for improving the low-temperature reduction pulverization performance of sintered ore, which mainly solves the technical problem of poor low-temperature reduction pulverization index of sintered ore with low MgO content in the prior art; in addition, the composite additive provided by the present invention Additives also have a significant effect on improving the low-temperature reduction pulverization index of sintered ore with conventional MgO content

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  • A Composite Additive for Improving Low-temperature Reduction Pulverization Performance of Sintered Ore

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific examples.

[0019] A compound additive for improving the low-temperature reduction pulverization performance of sintered ore, the weight percentage of its composition is: CaO2-5%, SiO 2 3-5%, MgO 43-45%, B 2 o 3 , SrO, La 2 o 3 The sum of the components is 0.2-0.5%, and the rest is burning loss and unavoidable impurities. The composite additives with a particle size of less than 1.0mm account for more than 90% of the total, and the composite additives with a particle size of less than 0.5mm account for the total More than 50% of.

[0020] Table 1 is the composition (by weight percentage) of the compound additive of the embodiment of the present invention, and the balance is burning loss and unavoidable impurities.

[0021] Table 1 Components of composite additives in the examples of the present invention, unit: weight percent.

[0022] Classification CaO SiO 2

MgO...

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Abstract

The invention relates to a composite additive for improving the low-temperature reduction degradation property of a sintered ore and aims to mainly solve the technical problem about a poor low-temperature reduction degradation index of the sintered ore which contains low-content MgO in the prior art. The composite additive for improving the low-temperature reduction degradation property of the sintered ore comprises the following ingredients in percentage by weight: 2 to 5 percent of CaO, 3 to 5 percent of SiO2, 43 to 45 percent of MgO, 0.2 to 0.5 percent of B2O3, SrO and La2O3 in total and the balance of burning loss and inevitable impurities, wherein the composite additive of which the particle size is smaller than 1 mm takes up 90% or more of the total amount; and the composite additiveof which the particle size is smaller than 0.5 mm takes up 50% or more of the total amount. The composite additive provided by the invention can be used for regulating the content and alkalinity of the MgO in the sintered ore and can also be used for improving the low-temperature reduction degradation property of the sintered ore.

Description

technical field [0001] The invention relates to an additive for iron and steel metallurgical sintering, in particular to a composite additive for improving the low-temperature reduction pulverization performance of sintered ore, and belongs to the technical field of iron and steel metallurgy sintering. Background technique [0002] The low-temperature reduction pulverization index of sinter is very important to the air permeability of the upper part of the blast furnace. Usually, in order to ensure that the sintered ore has a good low-temperature reduction pulverization index, the sintered ore needs to have a certain MgO content, that is, a flux containing MgO, such as dolomite, magnesite, serpentine, etc., is added to the sintering ingredients. However, adding too much MgO-containing flux to the sintering ingredients will bring a series of negative effects on the sintering-blast furnace ironmaking production, such as the reduction of sinter strength, poor high-temperature r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 韩宏松沈峰满姜鑫
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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