Application of limonite as adhesive and pellet preparation method

Abstract

The invention discloses an application of limonite with excellent balling property as an adhesive and a pellet preparation method. The limonite comprises limonite powder, and chemical components of the limonite powder comprise iron, silicon dioxide, calcium oxide, magnesium oxide, aluminum oxide, water, sulfur, phosphorus and the like. The pellet preparation method comprises the steps of raw material preparation and mixing, pelletizing, drying, preheating, roasting, cooling and the like. The drying comprises forced air drying and air draft drying. The balling index of the limonite-based adhesive reaches 1.55, and the balling index is improved by 59.8% compared with the balling index of bentonite in the prior art. By the adoption of the pellet preparation method with the limonite powder as the adhesive, the adding amount of the bentonite in the pelletizing process can be reduced by 40%, the charging grade of iron-containing raw materials of a blast furnace is improved by 0.18%, the slag discharging amount is reduced by 0.27%, the carbon dioxide emission amount is reduced by 0.99%, and the ore blending cost is reduced by 22 yuan / ton or above. The blast furnace smelting has the benefits of cost reduction, efficiency improvement, energy conservation and emission reduction, and has important significance for realizing carbon neutralization when carbon reaches the peak.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to an application of limonite as a binder and a preparation method of pellets. Background technique [0002] With the rapid development of the iron and steel industry, ironmaking blast furnaces are developing towards large-scale development. However, due to the increase in the cost of raw materials, fuels and energy and power, iron and steel enterprises are currently in an era of meager profits. All iron and steel enterprises can only continue to reduce costs to adapt to the meager profits they are in. In order to obtain a larger space for production competition, blast furnace ironmaking puts forward higher requirements on the quality of the furnace charge. [0003] During the sintering process of iron and steel smelting, the emission of flue gas is large and the pollution is serious, which is difficult to be treated by conventional technology. However, due to the high iron c...

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Problems solved by technology

[0004] However, at present, the binder used in the production of pellets in my country is mainly bentonite, and there is a problem that the proportion of bentonite is generally too high, which not only reduces the iron grade of the pellets, but also increases the amount of blast furnace slag, making the blast furnace coke ratio increase, utilization factor decreases

If the amount of bentonite is directly reduced, it will affect the pelletizing performance of iron ore powder, for example, the quality and output of pellets will decrease

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