Device and process for removing lead and zinc elements from iron ore

Abstract

The invention relates to removal of impurity elements from iron core, particularly to a device (b) and process for removing lead and zinc elements from the iron ore. The device (b) comprises a sintering machine and a set of sealed heating device. Comparing with an ordinary sintering machine, a device for blowing a coating is additionally arranged at the bottom of the sintering machine. A layer of heat-resistant coating is arranged on trolley grate bars by blowing so as to prevent hot sinter ore discharged from a heating furnace from sticking to the trolley grate bars. The heating device is arranged at the tail part of the sintering machine. Sintering process is basically completed before the iron core enters the heating furnace so that the quality of the sinter ore is not affected. Due to the fact that the sealed heating device is additionally arranged to provide a reducing atmosphere as well as required temperature for reducing ZnO and PbO, the removal ratio of the lead and zinc during the sintering process reaches up to more than 95%. The device for removing the lead and zinc elements from the iron ore guarantees continuous sintering process and has little influence on sintering productivity.

Description

technical field [0001] The invention relates to the removal of impurity elements in iron ore, in particular to a device and process for removing lead and zinc elements in iron ore. Background technique [0002] In recent years, my country's steel production has increased rapidly. In 2013, my country's crude steel production reached 782 million tons. The increase in steel production has caused a shortage of iron ore resources. my country has a large number of iron ore resources, but most of them are low-grade iron ores associated with polymetallics. For example, iron ores in some areas of my country contain relatively high levels of lead and zinc. [0003] When the charge containing lead and zinc enters the blast furnace, it will circulate and enrich in the blast furnace. The enrichment and circulation of zinc and lead in the blast furnace will cause serious harm to the blast furnace itself and the molten iron. The furnace throat zinc tumor damages the charge and air flow di...

AI Technical Summary

Problems solved by technology

[0010] The removal of lead and zinc in iron ore through sintering process has always been the focus of attention. However, the sintering process is carried out under an oxidizing atmosphere on the one hand, and only partly in a reducing atmosphere. The reduced lead and zinc are easily regenerated. Oxidation, on the other hand, the temperature in the material layer is not uniform, only the temperature of the combustion zone can meet the requirements of reducing PbO

Therefore, the effect of removing lead and zinc in iron ore by traditional sintering process is not ideal, and the general removal rate is only about 30%.

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