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A kind of magnesium oxide-based filter with multi-porous structure and preparation method thereof

A porous magnesia and magnesia-based technology, applied in chemical instruments and methods, separation methods, filtration and separation, etc., can solve problems such as poor ability to absorb non-metallic inclusions, difficult to apply molten steel filtration, and reduce the refractoriness of products. Achieve the effects of strong adsorption of inclusions, high refractoriness, and improved hydration resistance and strength

Active Publication Date: 2021-11-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] "A magnesia-aluminum spinel reinforced magnesia-based foam ceramic filter and its preparation method" (CN201810307155.8) patent technology, using magnesia-based ceramic powder containing nano-alumina sintering aids, nano-alumina sol and flow Although the magnesium oxide-based foam ceramic filter is prepared by using the template method with polyurethane foam as the raw material and the polyurethane foam as the raw material, the skeleton thickness of the obtained product is thin, the strength is low, and the service life is short.
[0011] "A MA-MF composite spinel-reinforced magnesia-based foam ceramic filter and its preparation method" (CN201810307627.X) patented technology, using light-burned magnesia, nanometer ferric oxide, etc. as raw materials, and organic foam as template, although the magnesium oxide-based ceramic foam filter has been prepared, but the obtained product has the disadvantages of low strength and poor ability to absorb non-metallic inclusions due to the thinner skeleton thickness and dense surface structure, and the introduced nanometer ferric oxide will Significantly reduce the refractoriness of the product, making it difficult to apply the product to molten steel filtration

Method used

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  • A kind of magnesium oxide-based filter with multi-porous structure and preparation method thereof
  • A kind of magnesium oxide-based filter with multi-porous structure and preparation method thereof

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Experimental program
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Embodiment 1

[0062] A magnesium oxide-based filter with a multi-porous structure and a preparation method thereof. The preparation method described in this embodiment is:

[0063] The first step, preparation of porous magnesium oxide particles and porous magnesium oxide fine powder

[0064] Under the condition of carbon burial, the magnesite particles are first heated to 660-740°C at a rate of 3-5°C / min, kept for 2-4 hours, and then heated to 1220-1380°C at a rate of 3-4.6°C / min , keep warm for 3-5 hours, then heat up to 1550-1600°C at a rate of 3-4.5°C / min, keep warm for 2.5-5 hours, and cool to obtain a porous magnesia material; crush the porous magnesia material and sieve , to obtain porous magnesium oxide particles with a particle size of 1.5-2 mm, porous magnesium oxide particles with a particle size of 0.5-1.4 mm, porous magnesium oxide particles with a particle size of 0.1-0.4 mm and porous magnesium oxide particles with a particle size of less than 0.074 mm powder.

[0065] The ...

Embodiment 2

[0073] A magnesium oxide-based filter with a multi-porous structure and a preparation method thereof. The preparation method described in this embodiment is:

[0074] The first step, preparation of porous magnesium oxide particles and porous magnesium oxide fine powder

[0075] Under the condition of buried carbon, the magnesite particles are first heated to 680-760°C at a rate of 3.5-5.5°C / min, kept for 3-5 hours, and then heated to 1220-1380°C at a rate of 3-4.6°C / min , keep warm for 2-4 hours, then heat up to 1550-1600°C at a rate of 3-4.5°C / min, keep warm for 2.5-5 hours, and cool to obtain a porous magnesia material; crush the porous magnesia material and sieve , to obtain porous magnesium oxide particles with a particle size of 1.5-2 mm, porous magnesium oxide particles with a particle size of 0.5-1.4 mm, porous magnesium oxide particles with a particle size of 0.1-0.4 mm and porous magnesium oxide particles with a particle size of less than 0.074 mm powder.

[0076] ...

Embodiment 3

[0084] A magnesium oxide-based filter with a multi-porous structure and a preparation method thereof. The preparation method described in this embodiment is:

[0085] The first step, preparation of porous magnesium oxide particles and porous magnesium oxide fine powder

[0086] Under the condition of buried carbon, the magnesite particles are first heated to 680-760°C at a rate of 3-5°C / min, kept for 2-4 hours, and then heated to 1260-1420°C at a rate of 2.5-4.1°C / min , keep warm for 3-5 hours, then heat up to 1550-1600°C at a rate of 3.5-5°C / min, keep warm for 2-4.5 hours, and cool to obtain a porous magnesia material; crush the porous magnesia material and sieve , to obtain porous magnesium oxide particles with a particle size of 1.5-2 mm, porous magnesium oxide particles with a particle size of 0.5-1.4 mm, porous magnesium oxide particles with a particle size of 0.1-0.4 mm and porous magnesium oxide particles with a particle size of less than 0.074 mm powder.

[0087] Th...

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Abstract

The invention belongs to a magnesium oxide-based filter with a multi-porous structure and a preparation method thereof. The technical scheme is: first mix porous magnesium oxide fine powder, silicon dioxide fine powder, calcium aluminate cement, α‑Al 2 o 3 Mix micropowder and polycarboxylate, then add porous magnesium oxide particles with particle diameters of 1.5-2mm, 0.5-1.4mm and 0.1-0.4mm respectively, mix well, add water and stir, form, maintain, and demould to obtain multi-pore structure of magnesium oxide-based filter green body; then the magnesium oxide-based filter green body with multi-porous structure is dried, and kept at 1570-1670 °C for 2-4.5 hours to obtain magnesium oxide with multi-porous structure base filter. The product obtained in the present invention has high strength, good thermal shock resistance, long service life, large flux of molten steel and is resistant to MgO and Al in molten steel. 2 o 3 and SiO 2 Strong adsorption capacity for non-metallic inclusions.

Description

technical field [0001] The invention belongs to the technical field of magnesium oxide-based filters. In particular, it relates to a magnesium oxide-based filter with a multi-porous structure and a preparation method thereof. Background technique [0002] Iron and steel materials are an important guarantee for my country's industrialization and national defense modernization, but in the process of iron and steel smelting, non-metallic inclusions (such as oxides, nitrides and sulfides, etc.) will be introduced due to slag and refractory materials, which will affect the purity of molten steel , Deteriorating steel quality. With the increasing demand for high-quality steel such as clean steel and variety steel, it is imminent to further reduce the harm of non-metallic inclusions and improve the quality of molten steel. [0003] The filter made of functional refractory material can absorb and filter non-metallic inclusions in molten steel, which is an effective means to improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20B01J20/10B01J20/28B01J20/30B22D43/00C21C7/00
CPCB01D39/20B01J20/041B01J20/08B01J20/103B01J20/28085B01J20/28095B22D43/004C21C7/00
Inventor 鄢文陈哲彭望定李光强王强李楠
Owner WUHAN UNIV OF SCI & TECH