Compound type binder used for pellet

Abstract

The invention discloses a compound type binder used for pellet, which comprises the following raw materials in percentage by weight: 70-80% of clay powder, 10-20% of sodium humate, 3-6% of sodium carboxymethyl cellulose and 2-4% of sodium carbonate. The compound type binder used for the pellet of the invention is a pellet binder prepared by combining inorganic substance and organic substance, hasgood hydrophily and high viscosity, can be dissolved into water, replaces bentonite completely, has extremely low carry-in amount of detrimental impurity of the inorganic substance and does not influence the iron grade of the pellet; and when added into iron finemeal pellet for production, the invention does not change the original process and is an ideal and synergistic pellet binder.

Description

1. Technical field: [0001] The invention relates to a binder used in producing oxidized pellets, in particular to a composite binder used in producing oxidized pellets. 2. Background technology: [0002] Oxidized iron ore pellets have the advantages of uniform particle size, high cold strength, high iron grade, and good reducibility. They are a high-quality blast furnace charge. In recent years, oxidized pellets have developed rapidly in my country, and the annual production capacity has reached 100 million tons. above. Iron concentrate pelletizing needs to add binder to make the pellets have a certain strength, which can keep them intact and not broken during the process of operation, drying, roasting, etc., and meet the requirements of blast furnace smelting. The binder is an indispensable raw material for the preparation of iron concentrate pellets. The problems that need to be paid attention to when selecting the pellet binder are: (1) It must have good cohesiveness and ...

AI Technical Summary

Problems solved by technology

However, in the process of using organic binders to prepare oxidized pellets, there are also the following problems: (1) due to the high hydrophilicity and high cohesiveness of organic binders, when they are added to the hydrous iron concentrate, The binder is easy to form a group when it meets water, and the outer layer forms a viscous and tough mucous film after absorbing water. Even with a strong mixer, it is difficult to disperse the bonded binder, resulting in its It is difficult to disperse evenly in the pelletizing process, and it is easy to form large balls during the pelletizing process, and the quality of the green pellets is not uniform, which makes the qualified rate of the green pellets low, which brings great difficulties to the pelletizing process; (2) due to the small amount of organic binder , the fluctuation in the addition process has a great influence on the production process; (3) due to the organic binder decomposes or burns to form micropores during the drying and preheating process, for some concentrates, the strength of the finished ball is compared with that prepared by bentonite Pellets have a greater degree of reduction

Therefore, the existence of the above problems limits the application of organic binders in the production of oxidized pellets in my country.