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Cause Analysis And Treatment Scheme Of Iron Ore In Blast Furnace Lining
Jan 08, 2019

The bottom of the manganese-silicon ore hot furnace of a factory is leveled with high-aluminum clinker powder, and the asbestos board is placed on the upper layer. The first layer is covered with high-alumina bricks, and then 5 layers of clay bricks are laid. The refractory particles are filled between the bottom brick and the furnace shell. Three layers of high-alumina bricks are laid again, and the brick joints are filled with refractory powder. The furnace wall is close to the furnace wall and is closely attached with a layer of aluminum silicate fiber felt, and then the high-aluminum brick is used to build a height of 2 meters. The carbon brick, the gap between the carbon brick and the furnace wall is poured with low cement corundum material, and the furnace mouth is made of semi-graphite silicon carbide brick.


Manganese-silicon mine hot furnace infiltration process


According to the oven curve diagram and the oven scheme, the ignition oven is tempered for 12 days, and the vent hole of the lower layer of the furnace has a flame emerging, and a small amount of tar is oozing out, indicating that a large amount of moisture has been discharged from the furnace lining, and the self-cultivating carbon brick is fired. Meet the oven curve and oven solution requirements. After the electric furnace is put into operation, the furnace condition is mainly divided into two stages. The first stage temperature is lower, the alloy contains lower silicon, which is basically below 17%; there is difficulty in inserting the electrode; the slag tapping is acceptable, respectively There are two large slags in the furnace, causing partial leakage of equipment and other normal. In the second stage, there is a phenomenon that the electrode pressure release continues to be severely less; there is a phenomenon that the temperature of the furnace cover rises by about 100 ° C every 2-3 days, which is about 500-600 ° C; there is a rapid increase in the temperature at the bottom of the furnace, and about 120 ° C is raised. Above, the most enthalpy temperature is around 1200 °C, the thermocouple burns out; there is a phenomenon of slag accumulation in the iron flow trough; the silicon in the alloy is gradually lifted, the current exceeds the rated value, the tapping is not smooth, and the damaged bottom is removed. In the case of a thermocouple, the thermocouple mounting hole became red at a distance of 300 mm from the bottom of the furnace, and a small iron piece was found to fall out, where there was iron seepage.


Analysis of Causes of Iron Ore in Mine Heater


Analyze the reasons: 


1 Whether the physical and chemical indicators of self-baked carbon bricks can meet the national standards;


2 When the masonry is built, the gap does not meet the masonry requirements, and some of the refractory bricks are reworked, and the rest of the masonry quality can meet the masonry requirements;


3 When the oven is baked, more wood and coke are added, the temperature rises too fast, and the temperature of the whole furnace rises rapidly;


4 operation to strongly insert the electrode to increase the voltage;


5 The current exceeds the rated value, the reactive power greatly exceeds the active power, and the power factor fluctuates around 0.3 in the case of compensation;


It is difficult to insert 6 electrodes, add dolomite in the early stage, increase coke, reduce coke in the later stage and add carbon-free material;


7 The use of 髙A1203 slag type is extremely unsuitable, 髙 melting point furnace fishing will shrink 坩埚, the electrode is difficult to insert, slag discharge is not easy, the discharge is clean, will worsen the deterioration of the furnace condition;


8 The impact of two large slags on the lining.


Treatment measures for iron infiltration in mining furnace


The treatment measures are:


1 Moderately reduce the Mn/Fe ratio in the ratio of charge to increase the iron content in the charge to facilitate the accumulation of carbonized cassia at the bottom of the furnace;


2 adopting carbon discharge, the batch of carbon in the batch can be reduced to 5% by 8^10%, and the normal batch can be restored at any time according to the increase of carbon emission from the tapping;


3 moderately improve the alkalinity of the batch and reduce the difficulty of slagging;


4 Pushing up the voltage at the right time, and suddenly raising the voltage will further increase the temperature rise of the furnace mouth;


5 In the case of the presence of technical management personnel, occasionally in the late stage of tapping, the power-off electrode is used to extrude the semi-melted charge in the crotch area, and at the same time, the furnace port is pulled to remove the slag;


6Adjust the quality of coke, use blue carbon and coke together in a certain ratio to increase the specific resistance;


7 current control within the rated value; strengthen the furnace mouth to pull slag;


8 In the case that the electrode does not rise significantly, the iron period is moderately extended to increase the furnace temperature.


Through the joint efforts of many parties, the analysis and practice have proved that the furnace condition has been greatly rotated, the tapping is smooth, the output of manganese-silicon alloy is improved, and its quality is guaranteed.


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