Pellet magnesium composite binding agent and preparation method and application method thereof

Abstract

The invention relates to a pelletized magnesia composite binder and a preparation method and a use method thereof, which are composed of the following components in parts by weight: 0.1 to 0.3 parts of an organic polymer material; 0.1 to 0.3 parts of a thickener parts; 99.5 to 99.7 parts of magnesium additives. First, the organic polymer material, thickener, and magnesite are mixed in proportion and co-milled to obtain a semi-finished product, and then the semi-finished product and light-burned magnesium powder are mixed in proportion and co-ground to obtain a finished product. When producing pellets, a magnesia composite binder is added to the iron concentrate powder to mix and prepare green pellets, and then the finished pellets are obtained by roasting; in terms of mass percentage, the amount of magnesia composite binder added is iron concentrate 1.0% to 3.5% of the amount of mineral powder added. Using magnesia composite binder to completely replace bentonite + magnesia additives to improve pellet quality; increase MgO content in pellets and reduce MgO content in sinter, so that both sinter quality and pellet quality can be achieved It has been improved together, and finally realized the increase of blast furnace production and the reduction of energy consumption.

Description

technical field [0001] The invention relates to the technical field of pelletizing binders, in particular to a pelletizing magnesia composite binder and a preparation method and application method thereof. Background technique [0002] Compared with sinter, pellets have the advantages of small and uniform particle size, high cold strength, high grade, and good reducibility. The use of pellets in blast furnaces can increase production, reduce coke ratio, and improve gas utilization, but pellets have their inevitable defects, namely "high reduction expansion rate" and "low reflow temperature". The production of magnesia pellets by adding MgO to pellets can overcome the above-mentioned defects, and it has been recognized that the effect of improving its high-temperature characteristics can be achieved. The pellets should match the high-temperature performance of high-basic sinters, and Pellets have the advantages of low expansion rate, high temperature reduction rate, and good...

AI Technical Summary

Problems solved by technology

At home and abroad, there are also pellet binders made of magnesium additives and high molecular weight organic matter. They do not contain impurities such as S and P. The bonding effect is better than that of bentonite, and the dosage is small, such as Palido, sodium carboxymethyl cellulose ( Na-CMC), etc., but the high price of high polymer organic matter, the excessive addition ratio makes the compressive strength of the finished ball low, and the problem of roasting increases, which limits its application and promotion in iron and steel enterprises

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