A kind of sintered synthetic slag and its preparation method

Abstract

The invention discloses a sintered synthetic slag, which comprises the following raw materials in weight percentage: 10-15% of high-adsorption filler, 25-35% of CaO, and 10-20% of SiO 2 , 8‑10% MgO, 6‑10% FeO, 1‑2.5% CaF 2 , 0.01-0.03% of P, 5-8% of water, 3-5% of aluminum iron balls, and the balance is impurities; the invention also discloses a preparation method of sintered synthetic slag; CaO and SiO 2 Grind into powder, then add water, MgO, FeO, CaF in sequence 2 , P, high-adsorption filler, mixed uniformly and made into a spherical shape, the particle size is controlled to be 50-60mm, and then mixed with aluminum-iron balls and then transferred to a high-temperature furnace for firing. The temperature of the high-temperature furnace is controlled at 1200-1300°C, The sintering synthetic slag was prepared in 3 hours; the high-adsorption filler can remove the hydrogen and floating oxidized slag inside the molten steel to make the molten steel more pure, and its own strong adsorption performance can absorb the slag. And quickly escape from the melt to improve the purity of molten steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a sintered synthetic slag and a preparation method thereof. Background technique [0002] Synthetic slag refining technology has become an important process in the production of clean steel in the steelmaking process. Because synthetic slag refining technology can reduce the content of oxygen, sulfur and inclusions in steel, it is widely used. In steelmaking production using synthetic slag refining technology, synthetic slag is usually divided into mixed synthetic slag, pressed synthetic slag and pre-melted synthetic slag. Mixed-type synthetic slag is made by mixing various block and powder raw materials according to the proportion and weighing. During transportation and storage, it is very easy to be broken, damp and pulverized, so there is a lot of dust and material loss during use. , slow melting, and serious environmental pollution; pressed molding synthetic...

AI Technical Summary

Problems solved by technology

Mixed-type synthetic slag is made by mixing various block and powder raw materials according to the proportion and weighing. During transportation and storage, it is very easy to be broken, damp and pulverized, so there is a lot of dust and material loss during use. , slow melting, and serious environmental pollution; pressed molding synthetic slag uses a high-pressure molding machine and is directly pressed into balls without adding a binder. Pulverization problem, and the investment cost of high pressure molding machine is relatively large

[0003] The Chinese invention patent publication number is CN1377977, which discloses a synthetic slag suitable for deoxidation and sulfur in steelmaking and its manufacturing method. The composition of the synthetic slag is: aluminum 2-15%, cerium 3-15%, magnesium 5- 8%, barium 2-10%, calcium oxide 20-50%, aluminum oxide 0-48%, magnesium oxide 2-10%, sodium silicate 2-10%, cellulose 2-8%. The production method is to mix limestone , fluorite and other high-alkalinity materials and fluxes are melted into slag, released and cooled to room temperature. The characteristic is that the slag, aluminum metallurgical slag, and calcium oxide raw materials are all broken into powders with a particle size of less than 0.5mm. Mix according to the ratio of [(2-4):(2-6):(1-3)] and add sodium silicate and cellulose at the same time, after mixing evenly, form φ10-20mm spherical synthetic slag and dry it at low temperature; the synthetic The production process of slag is cumbersome, and the cost of raw materials and preparation is relatively high