Preparation method for iron powder cold-pressing pellet composite binder

Abstract

The invention discloses a preparation method for an iron powder cold-pressing pellet composite binder and belongs to the technical field of iron powder metallurgy pellet binders. The composite binder is formed by successfully compounding inorganic binders, organic binders and multiple kinds of auxiliaries. The iron powder cold-pressing pellet composite binder is composed of bentonite, rapid hardening portland cement, rapid hardening sulphate aluminum cement, sodium carboxymethyl starch, polyacrylamide, pregelatinized starch, coal ash, magnesium oxide, calcium carbonate, gypsum and cement water-reducing agents by the mass ratio of 10-15: 3.5-5.0: 0-1.5: 3-8: 1-3: 5-6: 2: 1: 1: 1: 0-1. The formula of the prepared binder reaches the purposes of reducing the use amount of the bentonite and improving the grade of pellets and the metallurgical performance. The composite binder is applied to iron powder cold-pressing forming, the iron powder pellets meeting the use requirement are obtained through pressing, and the property indexes of the raw pellet strength, burst temperature and finished pellet compressive strength all meet the quality requirement of pellets.

Description

technical field

[0001] The invention relates to the technical field of metallurgical pellet binders, in particular to a preparation method of iron powder cold-pressed pellet composite binders. technical background

[0002] With the development of modern blast furnace ironmaking towards high yield, low consumption, long life and the application of new iron and steel smelting technologies, pellets play an increasingly important role in the iron and steel industry and have become an indispensable high-quality blast furnace metallurgical charge. Domestic pellet production mainly uses bentonite as a binder, and its main components are inorganic substances such as silicate and alumina; the general dosage is 3-5%, which will cause high inorganic content in the pellets, iron The grade decreases; the amount of slag increases in blast furnace smelting, the energy consumption increases, the utilization coefficient of blast furnace decreases, and the coke ratio increases, which is not c...