Particle magnesium desulfurizer/particle magnesium alloy desulfurizer based on magnesium, magnesium alloy and waste materials thereof and preparation method

Abstract

The invention relates to a particle magnesium desulfurizer / particle magnesium alloy desulfurizer based on magnesium, magnesium alloy and waste materials thereof and a preparation method. In the invention, with magnesium, a magnesium waste material or a magnesium alloy and a magnesium alloy waste material as raw materials, and with a salt additive as an auxiliary material, a composition mixing 93%of magnesium solution or magnesium alloy solution and 7% of salt solution is formed, wherein the salt solution comprises the following components and contents: 50-65% of sodium chloride, 30-45% of potassium chloride and 2-5% of magnesium chloride; and a matched scheme combining with a production line and a production process is adopted. In the invention, the comprehensive problems of high energy consumption, serious pollution, poor safety, serious resource waste, high equipment failure, too many substandard products, high production equipment investment, low output, loose finished product surface structure, low compactedness, easy falling, easy moisture absorption, influences on steel output and quality, great magnesium resource loss, low utilization rate and the like in the traditional finished particle magnesium product and production thereof are overcome; the particle magnesium desulfurizer / particle magnesium alloy desulfurizer is widely applied to molten iron pretreatment desulfurization and molten steel deep desulfurization in iron and steel smelting and utilized as a component of a cast iron mixed denaturing agent and an intermediate alloy in the production of fusion ferrosilicon.

Description

technical field [0001] The invention relates to a granular magnesium desulfurizer / granular magnesium alloy desulfurizer and a preparation method based on magnesium, magnesium alloy and waste materials thereof. Background technique [0002] Granular magnesium is generally used as a desulfurizer in the smelting process of existing iron and steel smelting enterprises, because in the hot metal pretreatment desulfurization process, although the price of Mg in the granular magnesium desulfurizer is expensive, because of the small amount of use, the temperature drop of molten iron is less , less slag, less iron loss, high desulfurization rate, low overall cost, and short processing cycle, which is very beneficial to high-paced converters, so the granular magnesium Mg desulfurizer has been adopted by various iron and steel smelting groups It is one of the technical measures widely used to improve the quality of steel production and expand the variety of steel production. In additio...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: ① Due to the limitations of the equipment, the clamping part of the magnesium ingot cannot be completely cut during cutting, that is, about 1 / 7 of each magnesium ingot cannot be cut, resulting in waste of resources; ② The particle size range of granular magnesium after granulation is difficult to control, and the proportion of substandard products is too high; ③The operating speed of all equipment is above 2000r / min, resulting in high equipment failure rate and high maintenance cost

The specific production process of this kind of granulation method is: generally use electric furnace equipment to melt magnesium ingot or magnesium alloy first, then mix magnesium liquid or magnesium alloy liquid with salt liquid and send it to centrifugal granulation cup for granulation, after screening The defects of this kind of granulation method are as follows: ① The raw material used for melting is pure magnesium or pure magnesium alloy, and the purity of magnesium must exceed 99.95%. The market price of this pure magnesium raw material is expensive, and the production cost is high; ② Use pure magnesium Or pure magnesium alloy as raw material, its additives contain fluoride, which is harmful to human health and serious environmental pollution; ③The magnesium particles produced by atomization have a high number of irregular particles, poor fluidity during the desulfurization process, and are prone to blockage guns, splashes, etc., and the desulfurization rate is low. In addition, the barium chloride in its salt additives is a toxic substance, which is also harmful to human health and serious environmental pollution; ④ use crucible electric furnace to melt magnesium ingots or magnesium alloys, Large power consumption, high energy consumption, and high cost; ⑤ The transfer of magnesium liquid or magnesium alloy liquid uses a transport tank, and cranes are used for hoisting, which is dangerous and the temperature of the magnesium liquid is not easy to control; ⑥ Pelletizing cup The design is unreasonable, resulting in low roundness of magnesium particles, serious tailing phenomenon, and many needles; ⑦The production process has a large amount of smoke and dust emissions, which pollutes the environment; ⑧Manual control of the production process results in poor consistency and low repeatability of the produced products

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