SU662607A1 - Method of roasting vanadium-containing iron-ore pellets - Google Patents

Description

An experimental study showed that the addition of red mud to vanadium containing pellets should be accompanied by a constant iron / vanadium ratio. Thus, during redistribution in blast furnaces, stabilization and improvement of the quality of vanadium is ensured.

pig iron, an increase in the through extraction of vanadium at the redistribution of the blast furnace. Thus, the addition of red mud

The pellets depend on the content of iron in them and are variable and the temperature-firing mode is largely determined by the addition of red mud, since it significantly affects. softening interval of iron ore pellets (100-120 degrees, in the absence of additions of red mud and 210-250. with addition of red mud).

Experiments have shown that each percentage of supplements with the red CMD fjienyet is coproog. to drive a lowering of the rbzhig temperature to 40-.60 C. With more reductions in temperature (more than 60 degrees,), the pro-OUT, underburning of the lower horizons: ipor, which worsens the quality of the finished product. COMING TO; YOURSHUYOUR-: tours (less than 40 degrees) do not observe a significant saving in specific consumption of cargo. Reducing the maximum PeratUrgy firing inevitably accompanies-,

. with a decrease in heat transfer rate

in a layer of pellets. To eliminate this phenomenon, increase the speed,

 filtering

Experiments have shown that each percentage of the addition of red mud should be accompanied by an increase in the filtration rate of the layer by 8–15%. With a smaller increase in the fi: ltration rates (less than 8%), the heat exchange rate in the bed is insufficient and the firing equipment performance decreases. An increase in the filtration rates of a layer by more than 15% is limited by the possibilities of liquid-in-situ equipment and the heating rates of the layer, ... /

PR k m er According to the iron content in the finely divided iron ore concentrate, the value of the addition of red muds is determined, pellets are made and the nbiiBepraioT is heat treated. First, the pellets are served in the drying zone. After

After removal of the good from them, they are sent to the burning zone. In this zone, for each percentage of red mud additions, the burning temperature is reduced by 40-60%. At the same time, I regulate the operation of the T Godutyevs; yoyo, the filtration rate is increased by 8-15%. After completion of roasting,

chilled and fed to the warehouse of finished products. .

The specific results of the implementation of the invention are shown in the table.

SODER; JANISH RED BLACK & those,% Decrease in the firing temperature, ° С Change in strength of octane, Example and - improvement; - The method can be used on the conveyor machines. The method allows to obtain vanadium-containing pellets with nocTOHHpbiM ratio of iron to vanadium. Furthermore, the method provides an improvement in the quality of the finished product and a reduction in the specific consumption of gas per process. O 35 O -1O 40 60 65 75 80 12O 125 + 1O n-5 -5 O + 1O +10 O deterioration in comparison with the known. When using red mud, there is no need to build slime of k.pitelei .. To prevent aegranous basins of rivers, lakes, seas, for the selection of fertile land plots the proposed invention is invaluable.

Claims (1)

1. Yervrezhna N.N.I. et al. Granulation of finely divided iron ore concentrates, M, Nedra, 1971. a / Patent Czechoslovakia No. 129962, 18A 1/30, 1967.