Nickel-containing high-calcium aluminum dreg ball and preparation method thereof

Abstract

The invention relates to a nickel-containing high-calcium aluminum dreg ball and a preparation method thereof. The nickel-containing high-calcium aluminum dreg ball comprises the following raw materials in parts by weight: 53-59 parts of metallic aluminum, 12-17 parts of aluminum oxide, 30-36 parts of calcium carbonate, 10-16 parts of magnesium oxide, 40-60 parts of an ethanol solution, 5-9 partsof nickel cyclopentyl carbonyl and 0.5-0.9 part of nickel tetracarbonyl. The strength of the prepared nickel-containing high-calcium aluminum dreg ball is improved, in a process of transporting the nickel-containing high-calcium aluminum dreg ball, the anti-impact ability of the nickel-containing high-calcium aluminum dreg ball is improved, and the breakage rate of the nickel-containing high-calcium aluminum dreg ball is greatly reduced. Meanwhile, the nickel cyclopentyl carbonyl, the nickel tetracarbonyl and the metallic aluminum simultaneously consume oxygen in primary melting molten steel,and the oxygen in the molten steel is remarkably reduced. Nickel remains in steel by reduction, a trace amount of metallic nickel can improve stability of the steel, and the resistance to oxidation ofthe steel is improved.

Description

technical field [0001] The invention relates to the technical field of pretreatment alloying of molten steel refining, and more specifically relates to a nickel-containing high-calcium aluminum slag ball and a preparation method thereof. Background technique [0002] With the development of the national economy and the improvement of steel quality requirements, the steel smelting technology has developed from the original one-step steelmaking to the two-step steelmaking, that is, two steps of primary smelting and refining. The temperature of molten steel and the content of main elements are controlled by primary smelting, followed by deoxidation, impurity removal and alloying treatment by refining to obtain the expected variety and quality of steel. [0003] In the process of steelmaking, the surface of the molten steel should be covered with an insulating agent before it enters the refining furnace to prevent the molten steel from cooling down and surface oxidation. Adsorb...

AI Technical Summary

Problems solved by technology

The second is that the molten steel comes out of the furnace without slag, and a carbonaceous thermal insulation agent with better thermal insulation performance is added to the surface of the molten steel to insulate and insulate the molten steel. However, the carbonaceous thermal insulation agent will increase the carbon content of the molten steel, which is extremely unfavorable for smelting low-carbon steel.

The third is to use fly ash and other carbon-free protective agents. Although this carbon-free protective agent avoids the carburization of molten steel, the main components of fly ash are alumina and silicon oxide. The phenomenon of molten steel returning to silicon is very unfavorable for smelting some steels whose silicon content is strictly controlled. On the other hand, a large amount of alumina needs to consume a large amount of calcium oxide, which is very unfavorable for reducing alumina inclusions in molten steel.

However, in the process of preparing aluminum slag balls, raw materials such as aluminum powder are only initially bonded by glass water, and most of the glass water volatilizes during high-temperature baking, and the prepared aluminum slag balls are only bonded by external pressure. The strength of the aluminum slag balls is small, and the aluminum slag balls are easily broken during the transportation of the aluminum slag balls, which not only causes a waste of materials, but at the same time, after the broken aluminum slag ball powder is added to molten steel, due to the fluidity of the powder Poor, the aluminum slag ball powder cannot quickly form a covering layer in the molten steel, resulting in the inability of the molten steel to be isolated from the external environment, and a large amount of oxygen enters the molten steel again, causing secondary oxidation