Method for producing coating particle magnesium

A granular magnesium and coating technology, which is applied in the field of desulfurization agent for the production of hot metal pre-desulfurization, can solve the problems of large power consumption, long time, high drying temperature, etc., and achieve the effect of high safety and simple production

Inactive Publication Date: 2011-11-23
辽宁丰华有色金属集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation method given by the above-mentioned technical scheme has the disadvantages of long production process, high drying temperature, long time, and large power consumption. In particular, the coating agent is glued to the magnesium particles with 801 glue, and it still needs to be dried to make the water less than 0.5 % and because the Cao coating agent is easy to hydrate and contains too much structured water, it is not good for desulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 200 kg of metal magnesium grains and 20 kg of fine powder above 500 mesh (aAl 2 o 3 Micropowder or silica fume) are poured into a sealed passivation pot with a rotating speed of 200-300r / min at high speed, stirred for 3-5 minutes, and after sieving, the finished coating granular magnesium with magnesium content ≥ 90% is obtained. The water content of the magnesium layer particles is determined by the powder for coating. The water content of the powder for coating itself is less than 5%, and the water content of the magnesium particles after coating is also less than 0.3%, without drying. The IC angle of the finished coated granular magnesium is 25-30°, and the bulk density is 0.89-0.94g / cm 3 , the flame retardant time is 15 seconds to 17 seconds, the finished coated granular magnesium is placed for 3 months without powder removal, the coating is intact, and it does not form lumps. When producing 24 mesh-100 mesh coated granular magnesium, there is no loss of active mag...

Embodiment 2

[0026] Pour 200 kg of metal magnesium granules and 16 kg of 320-mesh bauxite or light calcium carbonate powder into a sealed passivation pot rotating at a high speed of 200-300r / min, stir for 3-5 minutes, and sieve to obtain magnesium Finished coated granular magnesium with a content ≥ 92%, the moisture content of the finished coated granular magnesium is determined by the coating powder, the coating powder itself has a moisture content of less than 5%, and the moisture content of the coated magnesium particles is also less than 0.3% , without drying. The IC angle of the finished coated granular magnesium is 25-30°, and the bulk density is 0.89-0.94g / cm 3 , the flame retardant time is 15 seconds to 17 seconds, the finished coated granular magnesium is placed for 3 months without powder removal, the coating is intact, and it does not form lumps. When producing 24 mesh-100 mesh coated granular magnesium, there is no loss of active magnesium and no hydrogen. release, high securi...

Embodiment 3

[0028] Pour 200 kg of metal magnesium granules and 10 kg of 300-mesh bauxite powder or calcium aluminate powder into a sealed passivation pot rotating at a high speed of 200-300r / min, stir for 3-5 minutes, and sieve to obtain magnesium Finished coated granular magnesium with a content ≥ 95%, the moisture content of the finished coated granular magnesium is determined by the coating powder, the coating powder itself has a moisture content of less than 5%, and the moisture content of the coated magnesium particles is also less than 0.3% , without drying. The IC angle of the finished coated granular magnesium is 25-30°, and the bulk density is 0.89-0.94g / cm 3 , the flame retardant time is 15 seconds to 17 seconds, the finished coated granular magnesium is placed for 3 months without powder removal, the coating is intact, and it does not form lumps. When producing 24 mesh-100 mesh coated granular magnesium, there is no loss of active magnesium and no hydrogen. release, high secur...

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Abstract

The invention relates to a method for producing coating particle magnesium, which is characterized by comprising the following steps of: placing metal magnesium particles with particle size of 24-100 meshes and coating powder with particle size of 200-500 meshes according to proportion into a high-speed rotating passivation pot with a rotating speed of 200-300 r / min; stirring for 3-5min, then sifting; and removing plastering floats to obtain a finished product, wherein the proportion of parts by weight of the added metal magnesium particles to the coating powder is 100: (5-10). The method is used for producing the coating particle magnesium of 24-100 meshes without losing magnesium activity and releasing hydrogen, and has the characteristics of simple process, high safety, stable product quality and lower preparation cost.

Description

technical field [0001] The invention relates to a method for producing a desulfurizing agent for pre-desulfurization of molten iron, in particular to a method for producing coated granular magnesium by a dry mixing method, which belongs to the technical field of B22F9 / 10 in the IPC International Patent Classification Table. Background technique [0002] The coated granular magnesium particles used in direct gun single injection and compound injection technology in hot metal desulfurization production are composed of metal magnesium particles and a film coated on the surface of magnesium particles as a steelmaking desulfurization agent. The traditional production process is to use light calcium carbonate: baking soda: CMC or 107 glue = 16: 16: 1, and adjust it with water to make a sprayable solution at 50-250 °C. Spray on the stirred magnesium particles in the passivation pot, dry at 250°C for about 20 minutes, and then sieve to obtain the finished product. During the passiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10C21C7/064
Inventor 赖峥华
Owner 辽宁丰华有色金属集团有限公司
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