Ferrochromium fine ore sintering technology

Abstract

The invention provides a ferrochromium fine ore sintering technology. The work process includes the steps that coarse powder and fine powder are screened, cold pressing is carried out on the fine powder to obtain balls, the coarse powder is mixed, then, the coarse powder and the fine powder are mixed to be jointly sintered and screened, and the oxygen enrichment sintering technology is adopted. After the sintering technology method is adopted, ferrochromium fine ore does not need to be finely ground. Compared with a pelletizing method, the technological process is simple, and according to the scheme, the overall water consumption is small, and the sintering burnup is correspondingly reduced; and the sintering capacity and sinter yield are increased.

Description

technical field [0001] The invention relates to a sintering process in the technical field of ferroalloy smelting, in particular to a sintering process of ferrochrome powder ore. Background technique [0002] Chromite is an important raw material for the production of high carbon ferrochrome from ferroalloys. At present, lump ore in chromite ore accounts for about 20%, powder ore (<8mm) accounts for about 80%, and it is relatively cheap. [0003] When the closed electric furnace is used to smelt ferrochrome fine ore, it is necessary to pretreat the ferrochrome fine ore, otherwise the air permeability of the electric furnace will be deteriorated, the furnace condition will be deteriorated, the energy consumption will be increased, and the operation safety of the electric furnace will be threatened. At present, the pretreatment technologies for ferrochrome powder ore suitable for closed electric furnace smelting mainly include sintering method and pellet roasting method. ...

AI Technical Summary

Problems solved by technology

The pellets produced by the two are suitable for smelting in closed electric furnaces, but both pelletizing methods require that the powder mass fraction of ferrochrome powder ore with a grinding particle size of ≤0.074mm (200 mesh) is ~80%, so the process equipment includes Large grinding equipment, the grinding equipment consumes a lot of energy

In addition, the two processes of pre-reduction pelletization and oxidation pelletization are complicated, and compared with the sintering method, the investment is huge

[0005] The patent application "a sintering process of chromite ore powder" with the authorized notification number CN101705356B discloses a sintering process of chromite ore powder, but the process plan needs to grind all the raw materials, especially the fine grinding of the ore powder to -0.074mm> 65%, so the steps of the sintering process are increased, and at the same time, because the grinding machine needs to be used, the process cost is increased and the process efficiency is reduced

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