Composite magnesium oxide for welding flux production and preparation method thereof

A technology of magnesium oxide and light magnesium oxide, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of insufficient gas escape, poor manufacturability, serious surface indentation, etc. Improves the effect of poor indentation and alignment, slag viscosity reduction, and slag melting point reduction

Inactive Publication Date: 2021-06-22
SICHUAN XIYE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high density and high melting point of traditional magnesia materials such as light-burned magnesia, dead-burned magnesia, and fused magnesia, the melting point of the flux particles is too large, resulting in arc space. Insufficient number of conductive particles, high viscosity of molten slag and poor fluidity, manifested in the welding process, will present the following problems: poor arc stability, insufficient gas escape leading to serious surface indentation, sticky slag and poor forming Problems such as poor manufacturability, unable to obtain a stable welding process
Limits the possibility of further increasing the MgO content in high strength steel welding consumable designs to increase the flux basicity design

Method used

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  • Composite magnesium oxide for welding flux production and preparation method thereof

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preparation example Construction

[0019] First, the present invention provides a kind of preparation method of composite magnesium oxide for flux production, comprises the steps:

[0020] S1: Heat the ultra-fine-grained iron oxide red from room temperature to 500-650°C, and keep it warm, turn over the material during the keep warm, and cool to room temperature after the keep warm;

[0021] S2 sieves the cooled iron oxide red in S1 for subsequent use;

[0022] S3 blends the iron oxide red in S2 with ultra-fine-grained magnesium oxide, and places them in a closed environment for stirring to obtain a premix;

[0023] S4 baking the premix at high temperature to obtain composite magnesium oxide.

[0024] In the present invention, the material of magnesia includes at least one of sintered magnesia, fused magnesia, or light magnesia;

[0025] The particle size of the sintered magnesia and the fused magnesia is at least 90% over -0.043mm; the particle size of the light magnesium oxide is 0.1-10 μm, the purity of MgO...

Embodiment 1

[0035] Embodiment 1 (light magnesium oxide)

[0036] A kind of preparation method of composite magnesium oxide for flux production is,

[0037] Put 200g of ultra-fine red iron oxide with a purity of 98% in a muffle furnace, raise the low temperature to 650°C and roast for 2 hours, take it out and cool it to room temperature, and disperse the roasted agglomerates with a 180-mesh sieve to obtain red iron oxide under the sieve;

[0038] Take 160g of iron oxide red under the sieve and 1000g of light magnesia with a purity of 98% and shake it on a high-frequency oscillator for 1 hour to form a premix, place the mixed premix in a muffle furnace, and Raise the temperature to 950°C, keep it warm for 2 hours, and place it in an airtight container after cooling to obtain a composite magnesium oxide material.

[0039] The chemical composition of the composite magnesium oxide material is expressed as a percentage, Fe 2 o 3 13.6%, MgO 86.1%, P 0.004%, S 0.009%.

Embodiment 2

[0040] Embodiment 2 (fused magnesia)

[0041] Put 100g of superfine red iron oxide with a purity of 98% in a muffle furnace, raise the low temperature to 650°C and roast for 2 hours, take it out and cool it to room temperature, and disperse the roasted agglomerates with a 180-mesh sieve to obtain red iron oxide under the sieve;

[0042] Take 35g of iron oxide red under the sieve and 1000g of superfine (particle size-0.035mm) fused magnesia with a purity of 98%, and shake it in a closed state on a high-frequency oscillator for 1 hour to form a premix, and place the mixed premix in In the muffle furnace, the room temperature is raised to 800°C, and the temperature is kept for 2 hours. After cooling, it is placed in a closed container to obtain a composite magnesium oxide material.

[0043] The chemical composition of the composite magnesium oxide material is expressed as a percentage, Fe 2 o 3 3.5%, MgO 96.8%, P 0.003%, S0.010%.

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Abstract

The invention relates to the technical field of welding materials, and discloses a preparation method of composite magnesium oxide for welding flux production, wherein the preparation method comprises the following steps: S1, heating iron oxide red with ultrafine granularity from room temperature to 650 DEG C, carrying out heat preservation treatment, turning over during heat preservation, and cooling to room temperature after heat preservation is finished; S2, sieving the iron oxide red cooled in the step S1 for later use; S3, blending the iron oxide red in the S2 with ultrafine-grained magnesium oxide, and stirring in a closed environment to obtain a premix; and S4, carrying out high-temperature baking treatment on the premix to obtain the composite magnesium oxide. The performance of the flux in the welding process is changed by utilizing the characteristics of fine granularity, large specific surface area, high activity and the like of the superfine iron oxide red and the superfine magnesium oxide material, so that the process arc stability is better, the forming is better, and the indentation is less.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a composite magnesium oxide for flux production and a preparation method thereof. Background technique [0002] At present, most of the welding materials for high-end equipment in my country are monopolized by foreign countries. In order to break this passive situation, it is urgent to start from raw materials and research and develop self-owned brand flux to replace imported flux. [0003] Magnesia materials (light burnt magnesia, dead burnt magnesia, fused magnesia) are the most widely used, largest and most important basic materials in flux. The main function of magnesium oxide in flux is to create slag and increase the basicity of slag, thereby improving the impact toughness of weld metal. Magnesium oxide materials are widely used in the production of flux, and the proportion of MgO in the composition formula of flux reaches about 30%. The particle si...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C3/04
CPCC09C1/0081C09C3/043
Inventor 郑若锋王吉缪兴平范阳阳雷力龙柄宏
Owner SICHUAN XIYE NEW MATERIAL
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