Drying-free bonding agent for iron powder cold pressing pellets

Abstract

The invention discloses a drying-free bonding agent for iron powder cold pressing pellets. The drying-free bonding agent comprises, by weight, 30-70 parts of starch, 5-20 parts of methyl cellulose ether, 15-25 parts of aluminosilicate, 10-20 parts of xanthan gum, 1-5 parts of silica and 1-10 parts of epoxy silane modified polybenzimidazole prepoly. The bonding agent is suitable for the iron ore powder and iron-containing dust cold pressing pellet field.

Description

technical field [0001] The invention relates to a polymer binder for cold-pressed pellets. More specifically, the invention relates to a non-drying adhesive for forming iron ore powder and iron-containing dust cold-pressed pellets. Background technique [0002] According to the process temperature, iron ore powder forming can be divided into two categories: high temperature forming and cold pressing forming. Cold press forming is to add appropriate binder to iron-containing powder, and after mixing, under a certain pressure, the mixed material is compressed into a block material with a certain shape, size, density, and strength. The process strength and final strength of cold-pressed pellets depend on the binder to maintain, so it has high requirements on the binder. At present, there is only small-scale production of cold-pressed pellets in China. Due to the low strength and high water absorption of cold-pressed pellets, they are only used as raw materials for small bla...

AI Technical Summary

Problems solved by technology

Organic binders include starch, sodium humate, papermaking waste liquid, etc., which have good bonding cold strength at room temperature, but when the temperature rises to 400°C, as the binder gradually decomposes, the cold-pressed pellets The mechanical strength is not high, and it is easy to be damaged and pulverized under the pressure in the furnace, so that the reduction of pellets cannot be carried out normally.

Most of the inorganic binders are clay, lime, and bentonite. Inorganic binders overcome the defect that organic binders lose their bonding due to pyrolysis, but they will increase the impurity content of the pellets, and the energy consumption and slag production will increase accordingly.

In addition, these binders have high requirements for the moisture content of iron ore powder. Generally, the moisture content is between 1.5-3.5% and can be cold-pressed into balls. High-temperature drying equipment dries wet iron powder, which consumes a lot of energy and increases the cost of cold pressing into balls

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