Additive for increasing low temperature reduction pulverization ratio of sintering ore and preparation method of additive

Abstract

The invention relates to an additive for increasing the low temperature reduction pulverization ratio of sintering ore and a preparation method of the additive. The additive for increasing the low temperature reduction pulverization ratio of the sintering ore and the preparation method of the additive mainly solve the technical problem of the poor low temperature reduction pulverization index of the sintering ore with the low content of MgO in the prior art. The additive for increasing the low temperature reduction pulverization ratio of the sintering ore comprises the components of, by weight, 30-32% of CaO, 2-4% of SiO2, 15-25% of MgO, and the balance burning loss and unavoidable impurities, wherein the sum of, by weight, MnO2, V2O5, and TiO2 is 0.7-1.0%, the weight of the additive withthe particle size being less than 1.0 mm accounts for 95% or above of the total weight of the additive, the weight of the additive with the particle size being less than 0.5 mm accounts for 75% or above of the total weight of the additive, and the weight of the additive with the particle size being less than 0.1 mm accounts for 20% or above of the total weight of the additive. The additive can notonly adjust the content and alkalinity of MgO in the sintering core, but also can improve low temperature reduction pulverization performance of the sintering ore.

Description

technical field [0001] The invention relates to an additive for iron and steel metallurgical sintering, in particular to an additive for increasing the pulverization rate of sintered ore at low temperature reduction and a preparation method thereof, belonging 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. The main factors affecting the pulverization index of sinter low temperature reduction are sinter basicity and MgO content. Usually, the alkalinity is adjusted by limestone and quicklime, and the MgO content is adjusted by fluxes such as dolomite. However, adding too much MgO-containing flux to the sintering ingredients will bring a series of negative effects on the sintering-blast furnace production, such as the decrease of sinter strength, poor high-temperature reflow performance, incre...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an additive for improving the low-temperature reduction pulverization rate of sintered ore and its preparation method, 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 present invention The provided additives also have a significant effect on the improvement of the low-temperature reduction pulverization index of sintered ore with conventional MgO content

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