Method for detecting balling performance of iron ore concentrates

Abstract

The invention discloses a method for detecting the balling performance of iron ore concentrates, comprising the following steps of: measuring the maximum molecular water of the iron ore concentrates by using a centrifugation method; measuring the maximum capillary water of the iron ore concentrates by using a saturated water absorption method; measuring the bulk density and the true density of the iron ore concentrates and calculating porosity; calculating the average particle diameter of the iron ore concentrates by using a laser granulometer; and calculating the balling performance of the iron ore concentrates by using a formula and giving out an evaluation order. The method has the characteristics that operation is simple, scientific and reasonable and has certain theoretical direction significance to the iron ore concentrate dosing operation. When the average particle diameter of the iron ore concentrates is less than 60 mu m, 200-mesh or 325-mesh raw materials are adopted for replacement, and the reliability of an estimation method is not affected by the average particle diameter.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for detecting the pelletizing performance of iron concentrate during pellet preparation. Background technique [0002] Due to its high cold strength and superior metallurgical properties, pellets are increasingly used as iron-containing charge in the iron and steel industry. my country's pellets have developed rapidly, and the output has increased from about 59 million tons in 2005 to 110 million tons in 2010. The production of pellets usually includes the preparation of green pellets, drying preheating, roasting and cooling. Good quality of green pellets is an important basis to ensure the stability of subsequent processes and the quality of pellets. [0003] The so-called ball-forming performance of raw materials refers to the ability of finely ground materials to form balls under the natural state and the dense ability under the action of mechani...

AI Technical Summary

Problems solved by technology

However, this evaluation method has the following problems: ①The corresponding relationship with the green pellet strength is poor; ②It cannot truly reflect the specific influence of raw material properties on the pelletizing performance, and cannot provide theoretical guidance for improving the pelletizing performance of iron concentrates

The above formula quantitatively analyzes the impact of pelleting moisture and the properties of raw materials on the strength of green pellets, but some parameters (relative porosity of green pellets, water saturation, material constant and pelleting moisture) cannot be obtained through testing before raw materials are pelletized , so that the above formula cannot be used to evaluate the pelletizing performance of iron concentrate

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