Manganese-silicon Alloy Submerged Arc Furnace Smelting Operation

Manganese-silicon Alloy Submerged Arc Furnace Smelting Operation

Smelting Operations

Normal closed Manganese-silicon alloy submerged arc furnace conditions must have a large enough crucible, good permeability of the charge, uniform fire at the mouth of the Manganese-silicon alloy submerged arc furnace, no fire when the furnace gas is purified, and create sufficient space for disasters is:

1. The raw materials entering the Manganese-silicon alloy submerged arc furnace have few impurities, the particle size and moisture content meet the requirements, the ingredients are accurate, and the composition and particle size of the raw materials are stable.

2. The slag basicity is suitable, the binary basicity Ca0/Si02=0.6~0.85, the Si02 in the slag is 35%43%, and the A1203 content varies from furnace to furnace, and the 16.5MVA ore furnace does not exceed 20%.

The reducing agent is sufficient and the particle size meets the requirements.

3. Ensure a suitable electrode working length, ranging from 1700 to 2000mm.

4. Ensure a sufficiently high furnace entry rate, pay attention to the change of the primary voltage, and when the primary voltage decreases, the secondary voltage should be increased by one level in time.

The charge of the closed Manganese-silicon alloy submerged arc furnace is automatically discharged into the furnace through the discharge pipe, and the charge bin is usually kept full. The Mn content in the slag is controlled to be less than 8%.

When the tap hole is blocked by the electrode, it hinders the slag discharge. At the same time, the slag basicity is appropriately increased, which is conducive to slag discharge.

During normal operation, the reasons and treatment methods for maintaining the three-phase voltage and current balance are: the working end of a phase electrode is too long, and the voltage of the phase of the ore furnace is reduced. At this time, the electrode should be kept small or not.

The partial addition of materials causes local coke surplus or carbon shortage. When the carbon shortage is serious, the item does not give full load. When the coke surplus is serious, the electrode of this item is lifted. The newly opened tap hole has a small furnace eye and poor carbon discharge. The amount of coke should be reduced.

If the slag basicity is not appropriate, slag will come out of the furnace mouth, the crucible will shrink, the furnace bottom will rise, and the electrode will rise. Slag discharge measures should be taken.

Abnormal furnace conditions must be fully observed and analyzed, the raw materials must be identified, and measures must be taken.

When the slag basicity is low, the slag is sticky, the slag is difficult to discharge, the slag is bubbling at the furnace mouth, the ore furnace fluctuates, and the residual manganese in the slag is high. At this time, measures should be taken to appropriately increase the basicity.

When the basicity is too high, the slag is thin, the slag iron flow is large, the electrode is lifted, the time is long, and the high temperature zone is reduced.

The alloy contains low Si, and the slag basicity should be reduced at this time.

When the amount of coke is too large, the electrode is lifted, the working end moves up, and the root pierces the fire. At this time, the amount of coke in the material ratio should be appropriate.

When the amount of coke is insufficient, the electrode is inserted downward, sometimes the current is not full, and the material is often trampled. The manganese in the slag is high, and carbon addition treatment should be done at this time.

When the amount of silica is too much, the slag basicity is low, the slag is sticky, the slag discharge is not smooth, the alloy Si content is low for a long time, the water-quenched slag turns white, and the electrode sometimes cannot provide the load. At this time, according to the situation, silica reduction and coke increase treatment should be done.

When the power of the closed Manganese-silicon alloy submerged arc furnace is insufficient for a long time, the furnace temperature decreases. Although the electrode is not long, it still remains high for a long time, and the iron output is significantly reduced. At this time, the first-level voltage should be increased, and at the same time, the material ratio should be slightly reduced. of char.

The causes of fire in closed Manganese-silicon alloy submerged arc furnaces are poor sealing, water leakage in the furnace, high humidity of the furnace material, a lot of powder, and blockage of the flue.