Method for improving quality of magnetite powder pellets

Abstract

The invention relates to a method for improving the quality of magnetite powder pellets. The method comprises a prehating calcination process in which the lengths of a first calculation section and a second calcination section of a chain grate are transformed, the conventional first calcination section is lengthened, and the conventional second calcination section is shortened; calcination temperature parameters are adjusted; specifically, temperature of the first calcination section is increased and temperature of the second calcination section is reduced; and meanwhile, the particle size of the pellets is correspondingly adjusted to 7-14mm from conventional 9-16mm. The method has the advantages that the temperature of the second calcination section is reduced, the strength of pellet finished products is aslo improved, and meanwhile, the metallurgical performance of the pellet finished products is aslo improved; and by adjusting the particle sizes of the pellets, the problem that the layer-by-layer uniform oxidation of the pellets is affected as the outer layers of the magnetite powder pellets are easy to rapidly solidify is solved.

Description

technical field

[0001] The invention relates to a method for improving the quality of magnetite powder pellets. Background technique

[0002] Magnetite concentrate powder is an ideal raw material for producing pellets. In the past, because the particle size of magnetite concentrate powder was relatively coarse, the proportion of particle size less than 0.074mm (particle size less than 200 mesh) was less than 60%. On the one hand, it was difficult to make pellets Green balls with qualified strength, at the same time, due to the coarse particle size, higher calcination temperature and longer calcination time are required during calcination. For this reason, the iron ore is further finely ground to further refine the particle size of the iron ore powder. The proportion of the particle size less than 0.074mm is mostly below 100%, and the proportion of the particle size less than 0.044mm (particle size less than 325 mesh) can also reach 80%. %above. However, during the producti...

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