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

Abstract

The invention relates to a pellet magnesium composite binding agent and a preparation method and an application method thereof. The pellet magnesium composite binding agent consists of the following components in parts by weight: 0.1-0.3 part of organic high molecular materials, 0.1-0.3 part of thickening agent, and 99.5-99.7 parts of magnesium additive. Firstly, the organic high molecular material, the thickening agent and magnesite are uniformly mixed in proportion for cogrinding to obtain a semi-finished product; and then, the semi-finished product is uniformly mixed with caustic burned magnesia in proportion for cogrinding to obtain a finished product. When pellets are produced, the magnesium composite binding agent is added in iron concentrate powder to mix green balls for roasting to prepare finished pellets; and the adding quantity of the magnesium composite binding agent is 1.0-3.5 mass% of the adding quantity of the iron concentrate powder. The magnesium composite binding agent is adopted to replace a bentonite+magnesium additive form, so that the pellet quality is improved, the MgO content in the pellets is increased, the MgO content in sintered ores is reduced, the quality of the sintered ores and the quality of the pellets can be improved, and increment of the yield of a blast furnace and reduction of the energy consumption are finally realized.

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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