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Passive granule alloy and preparation method thereof

A technology of alloys and particles, which is applied in the field of passivated particle alloy magnesium and its preparation, can solve the problems of molten steel and molten iron that are prone to side effects, affect the use of desulfurizers, increase the process flow, etc., achieve simple manufacturing processes and reduce desulfurization in steelmaking Cost, the effect of uniform and dense passivation layer

Active Publication Date: 2008-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] All of the above-mentioned methods must cover the surface of granular magnesium, which 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 desulfurization agent. Effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] As shown in Table 1, Ca (Wt%): 2% and Be: 0.3% are added to liquid magnesium to obtain granular alloy magnesium after atomization. Its particle size is 1.2mm, and its flame retardancy time at 1000°C is 11 seconds. Proportioning passivation solution, its concentration is: magnesium chloride 0.8 g / mole, potassium fluoride 0.1 g / mole, passivation solution and the particle alloy magnesium that has undergone surface oxidation treatment are mixed according to the weight mixing ratio of 1:10. The passivated granular alloy magnesium is dried at a drying temperature of 100° C. and a drying time of 30 minutes. Tests have shown that the desulfurization rate of the passivated granular alloy magnesium in Example 1 is 80%.

Embodiment 2

[0049] Add Ca: 3%, Be: 0.45%, and the rest is Mg in liquid magnesium. Granular alloy magnesium is obtained after atomization, with a particle size of 1.2 mm and a flame-retardant time of 13 seconds at 1000° C. The concentration of the passivation solution is: 0.7 g / mol of magnesium chloride and 0.2 g / mol of potassium fluoride. The passivation solution is mixed with the surface oxidized granular alloy magnesium in a weight mixing ratio of 1:30. The passivated granular alloy magnesium is dried. The drying temperature is selected as 150° C., and the drying time is 20 minutes. Tests have shown that the desulfurization rate of the passivated granular alloy magnesium in Example 2 is 84%.

Embodiment 3

[0051] Add Ca: 4%, Be: 0.6%, and the rest is Mg in liquid magnesium. Granular alloy magnesium is obtained after atomization, with a particle size of 1.2mm and a flame retardancy time of 14 seconds at 1000°C. The interior of the passivation product is granular alloy magnesium, and the concentration of the passivation solution is: 0.6 g / mol of magnesium chloride and 0.3 g / mol of potassium fluoride. The weight mixing ratio of the passivation solution to the surface oxidized granular alloy magnesium is 1:20. The passivated granular alloy magnesium is dried. The drying temperature is selected as 200° C., and the drying time is 10 minutes. Tests have shown that the desulfurization rate of the passivated granular alloy magnesium in Example 3 is 88%.

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PUM

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Abstract

The granular deactivated magnesium alloy includes magnesium alloy grain, one surface oxide film and one deactivating film layer outside the oxide film. The magnesium alloy grain consists of Ca 2-4 wt%, Be 0.3-0.6 wt%, and Mg for the rest. The granular deactivated magnesium alloy is prepared through the following steps: preparing magnesium alloy grain, setting magnesium alloy grain inside dry air to form surface oxide film, compounding deactivating liquid with the mixture of magnesium chloride and potassium fluoride and water, deactivating the magnesium alloy grain with surface oxide film, and drying. The granular deactivated magnesium alloy with homogeneous compact deactivating layer has low production cost, damp-proofing property and low consumption during being applied in desulfurizing molten iron.

Description

technical field [0001] The invention relates to a magnesium-based desulfurizer used in iron and steel metallurgical industry, belongs to the technical field of desulfurization of ferrous alloys in a molten state, and in particular relates to a passivated granular alloy magnesium and a preparation method thereof. Background technique [0002] Desulfurization of molten iron and molten steel has become the main means to improve steel quality, expand varieties and improve steelmaking operations, especially in full continuous casting production, the pace is fast, and a high-efficiency and short-term desulfurization technology is needed without increasing costs. [0003] The development of desulfurization technology has gone through three stages: CaO desulfurization, CaC2+CaO mixed desulfurization, passivated magnesium desulfurization. At present, passivated magnesium desulfurization has become the mainstream desulfurization technology, and a certain scale of production practice h...

Claims

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Application Information

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IPC IPC(8): C21C7/064C22C23/00B22F9/02C23C8/10C23C22/34
Inventor 陈锦松龙川江蒋晓放
Owner BAOSHAN IRON & STEEL CO LTD
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