Converter final slag modifier and preparing method

Abstract

The invention relates to a converter final slag modifier. The converter final slag modifier is composed of, by weight percentage, 60%-80% of magnesium waste with granularity smaller than or equal to 1 mm, 10%-30% of waste lime powder with granularity smaller than or equal to 1 mm, 1%-5% of coke powder with granularity smaller than or equal to 1 mm, 5%-9% of a binder and water, wherein the water accounts for 20%-30% of the total amount of raw materials. The condition that MgO in a mixing material is not lower than 55% is met. The preparing steps include that the magnesium waste, the waste lime powder, the coke powder and the binder are evenly mixed, and the water accounting for 20%-30% of the total amount of raw materials is added and sufficiently mixed; ball forming is carried out; and air cooling is carried for standby application. According to the converter final slag modifier, on the premise that the requirement for the converter final slag modifier for steelmaking is met, the waste magnesium contained material is used to the maximum degree, the waste lime powder is then added, the production cost is reduced by not smaller than 55% of the existing cost, and stacking of the waste magnesium contained material is greatly reduced.

Description

technical field [0001] The invention relates to a steelmaking material and a preparation method thereof, in particular to a converter final slag modifier and a preparation method thereof. Background technique [0002] With the progress of converter steelmaking technology, converter final slag upgrading technology has been widely used in major steel mills. In the existing converter final slag modification technology, it is mainly to add a final slag modifier before tapping after the converter blowing is completed to realize the modification of the converter final slag. The purpose is threefold: to increase the final slag viscosity , to prevent molten steel from being polluted by slag from tapping; increase the (MgO) content in the slag, which is convenient for slag splashing to protect the furnace; reduce the (FeO) content in the slag, and reduce the iron loss during slag pouring. Therefore, the modification of final slag is an important part of steelmaking to reduce product...

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Problems solved by technology

After analysis, it is prepared with authentic raw materials, which have the disadvantages of high price and large dosage

[0006] The Chinese patent application number is 201410340147.5, "converter final slag modifier and its use", which discloses a final slag modifier prepared from "dust removal ash + steelmaking sludge + waste magnesia bricks + carbonaceous materials" , the upper limit of its MgO content is only 35%, and if the amount is small, there will still be a large number of waste magnesium-containing bricks that will not be fully utilized, and there will be problems of accumulation or discarding

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