Slag modifier and preparation method and application thereof

Abstract

The invention discloses a slag modifier which comprises the following components by weight percentage: 40-70% of aluminium dross, 10-35% of aluminium skimmings, 10-40% of active lime, 0.5-10% of fluorite, and 0-35% of calcium carbide, wherein the Al content in the aluminium dross is 15-50%, and the Al content in the aluminium skimmings is 75-95%. The slag modifier prepared by the invention is hard in quality, is not cracked, has no powder, cannot cause dust when molten steel is fed, and is beneficial to environment protection. As a large amount of aluminium dross is used, a new effective utilization way can be provided for the industrial slag, and simultaneously, the aluminium skimmings adopt leftover bits and pieces produced during processing in aluminum industry, so that the situation that regenerative aluminum processing is performed again is avoided, resources are saved, and economic benefits are outstanding.

Description

technical field [0001] The invention relates to a slag modifier, belonging to the field of steelmaking and refining. Background technique [0002] my country has now become the world's largest aluminum producer and consumer, producing more than 10 million tons of electrolytic aluminum and more than 4 million tons of recycled aluminum every year. Various by-products will be produced in the process of aluminum smelting and forming. Chips (or aluminum pellets, aluminum wire segments) contain high aluminum content, up to 80%-95%, and can be directly applied. The slag produced in the production process of electrolytic aluminum or cast aluminum is called chemical aluminum dust. The current annual output of aluminum ash is 850,000 to 1.3 million tons. If you consider the annual growth and savings over the years, this number will be even more alarming. In the past, people regarded aluminum ash as waste slag and dumped it, which not only caused waste of aluminum resources, but also ...

AI Technical Summary

Problems solved by technology

CaO+CaF 2 Al-based regulators have been widely used. Although the operation method is simple and the cost is low, the amount of slag is large and the slag formation speed is slow, and it cannot fundamentally solve the problem of re-oxidation of molten steel by FeO and MnO in slag; Al-based deoxidation effect is good, but High cost; CaC 2 The base is a better diffusion deoxidizer, but in the process of use, there will be occasional carburization

[0004] Chinese patent CN1441066A discloses an aluminum slag making ball. The process of using a binder will have many effects: the use of bentonite will reduce the alkalinity of the refining slag and affect the refining efficiency; the addition of organic matter such as starch will increase the hydrogen of the molten steel, Increase the probability of steel white spot defects

Chinese patent CN100569962 uses a large amount of metal aluminum powder, which increases resource consumption and steelmaking costs, and the increased carbonization probability of a large amount of calcium carbide is not conducive to the production of ultra-low carbon steel.

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