Inactivating magnesium desulfurizing agent and preparation method thereof

Abstract

The invention provides an inactivating magnesium desulfurizing agent for the field of smelting technique and a preparation method thereof. The desulfurizing agent includes granulated magnesium and passivation layer, wherein the passivation layer packs granulated magnesium inward; and the components of desulfurizing agent and weight percentages are as follows: magnesium 93-96%, lanthanum 0.50-1.50%, cerium 0.35-1.05%, praseodymium 0.12-0.36%, neodymium 0.04-0.08%, samarium 0.01-0.03%, and the rest is impurity; the preparation method of the desulfurizing agent includes the following steps: solid-dissolving rare-earth into pure magnesium for obtaining granulated magnesium; formulating inactivating liquid using acetic acid and lanthanum cerium chloride, inactivating granulated magnesium usinginactivating liquid for forming passivation layer; drying inactivated granulated magnesium, obtaining inactivating magnesium desulfurizing agent. The preparation method provided by the invention has the characteristics of simple technique and high productivity effect, uniformly firm of prepared desulfurizing agent passivation layer and long flame-retardant time.

Description

technical field [0001] The invention relates to a desulfurizer used in the technical field of smelting and a preparation method thereof, in particular to a passivated magnesium desulfurizer and a preparation method thereof. Background technique [0002] At present, the automobile industry, oil exploration, large ships and other projects have higher and higher requirements on steel quality. The iron and steel industries all over the world are trying to improve the quality of steel by reducing the impurities in steel, especially the sulfur content. Desulfurization outside the hot metal furnace, which is implemented as a converter to smelt high-quality steel or alloy steel, generally requires deep desulfurization to desulfurize to the "double zero" level, that is, less than 0.005% to 0.001%. Magnesium particles are used for steel desulfurization, with excellent performance, and the desulfurization efficiency is far better than the previous CaO and CaC 2 , can carry out deep de...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent publication number is CN1354057 invention patent, on the surface of metal magnesium powder, one layer of hydrophobic layer and one layer of flame retardant layer are coated sequentially; the hydrophobic layer is a mixture of rosin, asphalt, resin, etc., and the flame retardant layer is CaO, CaCO 3 , MgO, MgCO 3 、Al 2 o 3 , SiO 2 and other compounds, the biggest problem is that its hydrophobic layer will increase the amount of slag in molten iron; Chinese Patent Publication No. CN2378399 discloses a composite layer passivation granular magnesium composed of granular magnesium, an anti-oxidation flame-retardant layer, boron oxide or calcium oxide to form a skin material The passivated granular magnesium disclosed by Chinese Patent Publication No. CN1485461 is formed by coating magnesium oxide or magnesium fluoride powder on the surface of granular metal magnesium to form an anti-oxidation layer, and then passivated; The surface covering layer increases the production cost and increases the process flow. It is easy to produce side effects on molten steel and molten iron during industrial desulfurization, and the covering layer is easy to fall off during transportation, which affects the use effect of the desulfurizer.

This method is limited by manufacturing equipment and cannot be mass-produced