Bentonite performance evaluation method and iron ore green pellet preparation method

Abstract

The invention discloses a bentonite performance evaluation method and an iron ore green pellet preparation method, and belongs to the technical field of iron and steel smelting. The method comprises the following steps: firstly, determining the water absorption rate and the viscosity value of the bentonite, then predicting the drop strength of green pellets prepared from the bentonite according to the relative size of the water absorption rate and the viscosity value of the bentonite, and evaluating the performance of the bentonite according to the drop strength. The performance of the bentonite can be evaluated according to the water absorption rate and the viscosity value of the bentonite, and the bentonite with excellent performance can be quickly and accurately evaluated and selected; furthermore, the selected bentonite and fine iron powder are mixed for pelletizing, and iron ore green pellets with excellent drop strength can be obtained.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and more particularly relates to a method for evaluating properties of bentonite and a method for preparing green iron ore pellets. Background technique [0002] Bentonite is used as an additive in the pelletizing process. A large number of experimental studies have shown that adding a certain amount of bentonite during the pelletizing process can significantly improve the quality of the pellets, including: green ball drop strength and compressive strength and burst temperature. At present, the bentonites mainly include: calcium-based bentonite, sodium-based bentonite and organically modified composite bentonite. Domestic research mainly focuses on the physical purification or sodium modification of calcium-based bentonite with a large amount, or the preparation of composite bentonite by adding organic binder to the bentonite. [0003] Montmorillonite content, blue absorption, co...

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Problems solved by technology

[0006] Aiming at the lack of a method for improving the green pellet strength of iron ore pellets by evaluating the performance of bentonite in the prior art, and the problem that the evaluation method in the prior art cannot accurately predict the drop strength value of the green pellets, the present invention provides a bentonite performance Evaluation method and iron ore pellet green pellet preparation method; by detecting the water absorption rate and viscosity value of bentonite, judging the performance of bentonite according to the relative value of water absorption rate and viscosity, thereby effectively solving the bentonite evaluation method in the prior art Single, and the problem that it is impossible to accurately predict the value of the falling strength of raw balls

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