A kind of pellet iron-based composite binder and its preparation and use method

Abstract

The invention relates to a pelletized ore iron-based composite binder and methods for its preparation and use. The pelletized ore iron-based composite binder is composed of the following components in terms of weight percentage on a dry basis: 95% to 95% of converter OG mud 97%, hydroxypropyl methylcellulose 1% to 2.2%, instant sodium carboxymethylcellulose 1% to 2.9%. In the present invention, the converter OG mud that has not been extruded and dehydrated is used as the iron-containing raw material, and the hydroxypropyl methylcellulose solution and the instant sodium carboxymethyl cellulose solution that have not been dehydrated and dried are added, and the heap leaching reaction is heated by microwave radiation The iron-based composite binder of pellets is obtained after deep fusion, which not only realizes the efficient recycling of converter OG mud, simplifies and shortens the production process of iron-based composite binder, but also helps to improve the quality of pellets and reduce the Production costs of iron and steel complexes.

Description

technical field [0001] The invention relates to the technical field of sintered pellet preparation, in particular to a pellet iron-based composite binder and methods for preparing and using the same. Background technique [0002] Pellets are one of the main raw materials for blast furnace ironmaking. Binders are usually added during the production of pellets. At present, the binder used in the production of pellets in my country is still mainly bentonite, and the amount of bentonite added is 1.5% to 2.0%. Due to the high impurity content and large amount of bentonite, it is difficult to improve the pellet performance and iron grade. Therefore, the development and development of new high-efficiency and functional binders to replace bentonite or reduce the amount of bentonite added is one of the important hotspots in the research and development of the current metallurgical auxiliary materials industry. [0003] In the technical solutions disclosed in Chinese patents with pat...

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Problems solved by technology

The Chinese patent with the patent number CN201510363539.8 discloses a "iron ore pellet iron-rich composite binder and its preparation method and application", in which the iron ore pellet iron-rich composite binder includes a mass ratio of 100: 1 to 10 iron mud and tackifier, wherein the tackifier is carboxymethyl cellulose, and the total iron content in the iron-rich composite binder is 35 to 40wt%, (SiO 2 +Al 2 o 3 ) content is ≤ 25wt%; the iron-rich composite binder in this technical scheme is only dried iron sludge and mixed with macromolecular organic matter mechanically and physically, and it simply introduces adding 1.0% iron-rich composite binder However, there is no detailed description of the effect of adding iron-rich composite binder on preheating roasting and finished pellets. At the same time, there are low bursting temperature, large amount of powder, and preheating and roasting pellet strength. Bad question

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