Metallurgical pellet compound binding agent

Abstract

The invention discloses a metallurgical pellet compound binding agent. The compound binding agent comprises the following components in percentage by weight: 45 to 50 percent of dust generated in blast furnace ironmaking and sintering production processes, wherein the dust is grounded to ensure that more than or equal to 80 percent of the dust has the particle size of 0.043 mm, the TFe in the dust is more than or equal to 60 percent, and montmorillonite in the dust is more than or equal to 20 percent; 10 to 15 percent of cassava meal of which more than or equal to 80 percent has the particle size of 0.043 mm; 10 to 15 percent of clay of which more than or equal to 80 percent has the particle size of 0.043 mm; 15 to 20 percent of fluorspar powder of which more than or equal to 80 percent has the particle size of 0.043 mm; and 4.5 to 5.5 percent of carboxymethylcellulose sodium of which more than or equal to 80 percent has the particle size of 0.043 mm. The carboxymethylcellulose sodium of the compound binding agent can be replaced by caustic soda and special-grade wheat flour. The components are uniformly stirred according to the percentage by weight to prepare the pellet compound binding agent; and during the production of pellets, 0.8 to 1.2 percent of 0.5 percent replaceable bentonite is added, and not only a requirement on pellet production can be meet, but also the used amount of the bentonite is reduced, thereby fulfilling the aims of improving the grade of pellet iron ores and simultaneously improving blast furnace coefficients.

Description

technical field [0001] The invention belongs to the category of metallurgical materials, and relates to a pellet binder, in particular to a composite binder for metallurgical pellets, which can reduce the amount of bentonite used in the production process of metallurgical pellets and increase the yield of metallurgical pellets. iron content. Background technique [0002] Metallurgical pellet binders mainly include bentonite, organic binders, and composite binders. [0003] The application of bentonite binder is mature and the price is low, but its high burnout rate seriously reduces the iron grade of pellets, increases the amount of slag in blast furnace ironmaking, reduces the coefficient of blast furnace, and increases fuel consumption. [0004] The organic binder has good bonding effect and less dosage, but its price is high and its application is immature. The fatal disadvantage is that the organic binder will undergo oxidation, decomposition and other reactions during ...

AI Technical Summary

Problems solved by technology

[0006] At present, in major iron and steel enterprises in China, calcium-based bentonite is used as a binder in the production of pellets, and a relatively large proportion of bentonite (generally montmorillonite content is 65%) is often added, while bentonite contains almost no Iron, its residue is obvious, thus reducing the iron grade of the pellets, resulting in a lower blast furnace coefficient, higher fuel consumption, and increased slag discharge

Practice has shown that using traditional natural bentonite as a binder, every 1% increase in production will reduce the iron content of the pellets by about 1%. 2 The content increases by 2% to 4%; but if the amount of bentonite added is low, the quality and strength of the green pellets will decrease during the pelletizing process, and the quality of the pellets will decrease

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