Preparation and use method of composite deoxidized modified pellets

Abstract

The invention discloses a preparation and use method of a composite deoxidized modified pellet. The ppreparation and use method comprises the following steps of A pellet, specifically, the the balling components of the A pellet comprises the following components of, in parts by mass, 30-40 parts of dolomite powder, 20-30 parts of steel slag powder, 20-30 parts of process coke breeze, 1.5-2 parts of an X-type organic binder, 15-20 parts of a Y-type inorganic binder and 3 parts of water, and is produced by adopting a cold pressing pellet process; and B pellet, specifically, the balling components of the B pellet comprises the following components of, in parts by mass, 30-40 parts of dolomite powder, 20-30 parts of limestone powder, 20-30 parts of process coke breeze, 1.5-2 parts of an X-type organic binder, 15-20 parts of a Y-type inorganic binder and 3 parts of water, and is procuced by adopting the cold pressing pellet process; and the A pellet and the B pellet are correspondingly in two process links of a converter and a refining furnace.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing and using composite deoxidized modified pellets. Background technique [0002] Problems existing in the converter process of some enterprises: the content of iron oxide and manganese oxide in the slag at the end of converter smelting is relatively high, which not only causes a large waste of iron and manganese metals, but also affects the subsequent The effect of splashing slag to protect the furnace, and at the same time, the dissolved oxygen in the molten steel is also in balance with it due to the excessive iron-manganese oxides in the slag, and more dissolved oxygen is retained. Therefore, when the steel is added to the alloy, the alloy is burned. Large, low yield. In addition, the life of the converter lining is also reduced due to the high oxidative properties of the slag (that is, the high content of unstable oxides such as iron oxide...

AI Technical Summary

Problems solved by technology

[0002] Problems existing in the converter process of some enterprises: the content of iron oxide and manganese oxide in the slag at the end of converter smelting is relatively high, which not only causes a large waste of iron and manganese metals, but also affects the subsequent The effect of splashing slag to protect the furnace, and at the same time, the dissolved oxygen in the molten steel is also in balance with it due to the excessive iron-manganese oxides in the slag, and more dissolved oxygen is retained. Therefore, when the steel is added to the alloy, the alloy is burned. large, low yield

[0003] Problems existing in the refining process of some enterprises: Taking the LF refining process as an example, it is necessary to add auxiliary materials to make slag, to play the role of molten steel heat preservation to reduce oxidation, submerged arc, arc stabilization, and S removal

The sintering batching can absorb part of the process powder coke, but because the particle size is too fine, it is not easy to batch and the index is deteriorated, so the sintering is only added in a small amount in stages, and the usage is limited

In addition, due to the fine powder characteristics of the process powder coke, it is also used together with blast furnace injection coal. However, because the process powder coke is sticky and wet, and it is easy to freeze and fast in winter, it is difficult to unload the material, so the amount of use is not large. The coldest three months a year Disabled to keep production going

Since lump coke and lump coal are mostly used in places where carbon is used in the factory, for iron and steel enterprises, process powder coke cannot be used up, resulting in high cost of the whole process

[0006] Steel slag problem: For the eastern provinces, there are many enterprises, large population, active economy, large building materials market, and steel slag can still be fully consumed