Binder, preparation method of binder and application of binder used as metallurgical pellet binder

Abstract

The invention relates to a binder, a preparation method of the binder and an application of the binder used as the metallurgical pellet binder, belonging to the technical field of the production of sintered pellets of the ferrous metallurgy. The technical scheme of the invention is as follows: the binder consists of the following one or two components: the mixture of polyacrylamide, sodium humate and nitrate or chlorate or perchlorate, corn starch mixture and the mixture of polyacrylamide and sodium aluminate. The preparation method comprises the following steps: adding the binder in fine iron powder for pelletizing of which 200-mesh passing rate is no less than 70% to mix evenly and pelletizing, wherein the dosage of the binder is 0.2-0.5% of fine iron powder. The invention has the beneficial effects: the binder has some properties of bentonite such as hygroscopicity and lubricity, the binder does not contain silicon, aluminum, phosphorus and sulfur, the pelletizing dosage of the binder is small, the burning loss is high, the high temperature burning loss of the binder is up to 60%-90%; and the pelletizing process mainly adopts lamellar packing growth, the agglomeration growth is reduced, the internal oxidation of the pellets in the chain grate can be promoted.

Description

technical field [0001] The invention relates to a binder, a preparation method, and an application as a metallurgical pellet binder, and belongs to the technical field of iron and steel metallurgical sintered pellet production. Background technique [0002] At present, metallurgical pellets have become one of the main raw materials for the iron and steel industry. The quality of pellets and the cost of pellets are also the main bottlenecks for reducing the cost of iron front. At present, the binder used in the pellet industry is mainly bentonite. Due to the high temperature residue of bentonite, the direct consequence of using bentonite is to reduce the iron grade of the raw materials into the furnace and increase the silicon content, which is unfavorable to the steel industry. The industry believes that each ton of iron will save 2% of coke and increase 3% of the product iron, which will bring huge economic and social benefits without basically increasing the input. Theref...

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Problems solved by technology

(3) The preheating time of green pellets on the chain grate is not long enough, and the temperature of the chain grate is not high enough, so that the degree of recrystallization of iron oxide inside the pellets is not enough

Due to the above reasons, organic binders can not be used stably in industry instead of bentonite pellets

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