A kind of molten iron slag collecting agent and preparation method thereof

Abstract

The invention provides a molten iron slag collecting agent; expanded perlite is used as a substrate, the components and mass percentages (%) of the slag collecting agent are as follows : 69 ~ 76% of SiO2, 0.6 ~ 1.2% of FeO, 1.5 ~ 2.3% of CaO, 0.2 ~ 1.2% of Na2O, 1.0~1.8% of TiO2, 0.8 ~ 1.5% of MgO, 1.0 ~ 1.4% of K2O and 0.1 ~ 0.3% of P, the slag collecting agent also includes by mass percentage (%), 2 ~ 5% of an adhesive , 0.5 ~ 1.2% of a heat insulating agent, 0.3 ~ 2.0% of a deoxidizing agent, and the balance of Al2O3. The invention also provides a preparation method of the slag collecting agent, and the preparation method includes the following steps: (1) preparation of an expanded perlite sample, to be more specific, collecting and selecting blocky perlite ore of 5 to 8cm, crushing into granules by a crusher, screening and picking broken granules to 0.9 ~ 1.7mm, then adding a cosolvent solution to the screened granules for soaking for 10 ~ 15s, performing pre expansion treatment, draining away water, putting into an oven of 750DEG C, drying for 2 ~ 3min to remove the water adsorbed on the surface of granules to obtain a perlite sample with a micro-hole structure, and raising the temperature of the oven to 850 ~ 1100 DEG C for pre heating to expand pores in micro holes to obtain an expanded perlite sample with the micro-hole structure; (2) preparation of slag collecting agent slurry; and (3) preparation of the slag collecting agent. The slag collecting agent of the invention has the characteristics of low cost, low dispersion, good fluidity, and strong slag adhesive capacity.

Description

technical field [0001] The invention relates to a slagging agent used in ladles, tundishes and electric furnaces and a method for preparing the slagging agent. Background technique [0002] Iron and steel is smelted from iron-containing ores. Iron ores are generally not pure, and contain non-metallic impurities such as sulfur and phosphorus. The main components of non-metallic impurities are silicates and oxides. During high-temperature smelting at ℃, non-metallic impurities are also melted. Because of their different properties from iron, a molten state of magma is formed. Because the specific gravity is lighter than that of iron, many small groups of impurities are dispersed and floated on the surface of high-temperature molten iron, and formed after condensation. Residue, if the residue is not removed when the molten iron is poured into the casting, it will be injected together with the molten iron to form lime sand, which will cause casting quality problems. [0003] In...

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Problems solved by technology

[0003] In the past, the straw ash widely used by foundry manufacturers has the function of heat preservation and avoiding the oxidation of molten iron, and also has a certain effect of collecting slag, but it seriously pollutes the environment, and it is very troublesome to store and use. carbon

With the continuous development of the field of liquid casting hydraulics, the perlite raw ore is directly used as a slag collecting agent after being crushed directly. The slag covering layer, its slag collecting and covering effect is far better than straw ash, but the slag collecting layer is not strong enough, it is easy to break when removing slag, and the adhesion to molten slag is not strong enough, and the perlite raw ore will cause splashing when it bursts on the surface of molten iron , some unexpanded particles are easy to enter the cavity from the gate and cause slag inclusion defects

[0004] In order to improve the slag collection effect, most domestic enterprises import slag collection and covering agent products from abroad, but the price is 5 to 10 times that of domestic products, and the cost is high

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