Technology for applying manganese ore to converter steelmaking in directly-alloying manner

Abstract

The invention discloses a technology for applying manganese ore to converter steelmaking in a directly-alloying manner. A single carbon drawing method is adopted in the converter steelmaking technology; the content of FeO in final slag ranges from 13% to 15%; the average smelting cycle is 12.3 min; and manganese alloy ore is added into a converter in batches within 4 min to 10 min after converter steelmaking smelting begins, wherein the adding amount of the manganese alloy ore of each batch ranges from 10 kilograms per ton of steel to 14 kilograms per ton of steel, the end point carbon content is larger than or equal to 0.08%, the final point temperature ranges from 1650 DEG C-1680 DEG C, the content of end point residual manganese is increased by 0.16% to 0.20%, and the content of the manganese element in the manganese alloy ore is at least, by weight percentage, 44.2%.

Description

technical field [0001] The invention relates to a direct alloying of manganese ore applied to a converter steelmaking process. Background technique [0002] At present, the coolant used in the converter smelting process of steelmaking plants is generally dedusted ash pellets, which mainly contain Fe 2 o 3 , CaO, alkaline, low melting point. Fe-rich ash pellets with low melting point 2 o 3 , can increase the content of primary slag (FeO) in converter smelting, accelerate the dissolution rate of lime, reduce the viscosity of slag, accelerate the mass transfer of lime dissolution process, realize the rapid formation of emulsified slag, and achieve the effect of de-P and de-S smelting. The (FeO) content in the slag in the middle and late smelting of converter smelting shows a downward trend, and the dedusting ash pellets can be used as a slag adjusting agent to improve the fluidity of the slag and meet the demand for (FeO) content in the slag in the later stage. Its shortco...

AI Technical Summary

Problems solved by technology

Its shortcoming is that the dedusting ash pellets play the role of slag removal and temperature adjustment in the smelting process, but with the increase in the addition of dedusting ash pellets, it also brings many adverse effects to the smelting operation:

The reaction temperature in the furnace is high in the middle and later stages of smelting. If the time and amount of adding dust-removing ash pellets are unreasonable at this time, slag overflow and splashing will easily occur when the smelting reaches 8 minutes to 10 minutes, resulting in metal materials and slag. The loss of material is not conducive to the control of steel material consumption

[0004] 2. Increased the difficulty of smelting process control

When adding a large amount of dedusting ash pellets, it is necessary to add materials in small batches and multiple batches. After the dedusting ash pellets are added to the furnace, the reaction in the furnace is violent and requires a high-speed gun to accelerate the melting of the dedusting ash pellets. After the internal reaction is stable, the contents of the furnace are uniformly lowered after the gun is lowered. During the frequent adjustment of the gun position, it is very easy to cause a production accident that the gun position is not adjusted in time to burn the gun.

[0005] 3. Increase the workload of dust removal equipment

At the same time, under the action of the flue gas generated in the smelting process and the suction generated by the high-speed operation of the fan, the dust-removed ash pellet powder flowing out of the feeding pipe is sucked into the movable fume hood and reaches the spray tower through the vaporization cooling flue. The tower and water gather to form a large amount of sludge, which affects the dust removal effect of the converter, causing a large amount of flue gas to overflow and pollute the environment