Refining slag for purifying and de-aluminizing silicon iron, and preparation method

Abstract

The invention discloses a refining slag for purifying and de-aluminizing silicon iron, and a preparation method. According to the refining slag for de-aluminizing the silicon iron prepared through themethod, not only can the preparation cost be reduced, but also a melting point and the density of the refining slag can be greatly reduced, the slag-gold separation can be easily realized, common silicon iron with a high aluminum content with relatively low cost can be treated into low-aluminum silicon iron with relatively high cost, and the use cost of the alloy in the smelting process is further reduced. Meanwhile, wastes produced in the continuous casting production process are used for preparing the refining slag so as to be high-efficiently and reasonably utilized, so that the sustainability of resources is realized.

Description

technical field [0001] The invention belongs to the field of alloy purification and refining, and in particular relates to a refining slag for purification and dealumination of ferrosilicon and a preparation method thereof. Background technique [0002] Ferrosilicon alloys are used as deoxidizers and alloy additives for steelmaking, and generally do not require aluminum content. However, when smelting some special steel types, such as smelting silicon steel, cord steel, heavy rail steel, etc., there are strict requirements on the aluminum content in ferrosilicon. Therefore, in the ferrosilicon production industry, it is usually necessary to deal with ordinary ferrosilicon alloys by refining outside the furnace. The main refining methods include chlorination refining and oxidation refining. The chlorination refining method has great environmental pollution and high investment cost, and is gradually eliminated; the oxidation refining method is easy to operate, low investment...

AI Technical Summary

Problems solved by technology

At present, the slag system commonly used in the ferrosilicon refining process is CaO-Fe 2 o 3 -SiO 2 -CaF 2 , but since the density of the slag is similar to that of ferrosilicon, it is difficult to separate the slag and iron

In order to form refining slag with low melting point and low density, people have carried out a lot of research on refining slag. In 2010, an article entitled "Dealuminumization and decalcification of ferrosilicon in the refining of "Noginseng slag" was published on the Ninth Metallurgical Engineering Science Forum. "Experimental Research on Capability" paper analyzed the application of "notoginseng slag" used in electroslag remelting to dealumination and decalcification of ferrosilicon alloy. To the dealumination effect, it will increase the aluminum content of the ferroalloy instead, and cannot be used for dealumination of ferrosilicon alloys

In the literature "Dealuminumization Test of Ferrosilicon Furnace Added Synthetic Slag Bottom Blowing Oxygen" (2000, "Ferroalloy" Journal No. 5), the experimental study on the dealuminization of ferrosilicon alloy was carried out by using the mixture of silica, iron filings and fluorite as the refining slag. , although the refining slag can also play a role in dealumination, but due to the SiO in the slag 2 High content, high viscosity of slag, difficult for refining slag to absorb aluminum oxide, resulting in poor effect of alloy dealumination purification