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Method for preparing MgALON-based compound material by using boron-rich slag

A composite material, boron-rich slag technology, applied in the field of material science, can solve the problems of shortened reaction time, secondary waste pollution, long time required, etc., to reduce production costs, control environmental pollution, and shorten the reaction time.

Inactive Publication Date: 2008-10-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminothermic reduction by Al 2 o 3 , Al and MgO or MgAl 2 o 4 MgAlON is directly synthesized in nitrogen. This reaction introduces a solid-solid reaction mechanism, but the cost is high, the process is complicated, the energy consumption is large, and it is not easy to produce on an industrial scale; the reaction sintering method passes Al 2 o 3 , AlN and MgO powder are mixed and synthesized by direct reaction at high temperature. This method has high synthesis temperature, takes a long time, high production cost, and the price of AlN in the raw material is expensive; the discharge plasma sintering method can make the solid solution reaction proceed rapidly and shorten the reaction time , but the cost of raw materials required for preparation is high and the process is complicated. Due to the limitation of equipment, it is difficult to industrialize production
[0004] The above three methods use pure reagents as raw materials, and the production cost is high; as a waste residue in the metallurgical industry, boron-rich slag has poor activity, and the boron in the slag is not easy to separate. The leaching method has high processing costs and poor economic benefits. , limited processing capacity, low added value of products, secondary waste and pollution, etc., it is difficult to achieve industrial application scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Physically crush the massive boron-rich slag, and then use the MZ-100 vibration mill to make the crushed slag into powder to obtain boron-rich slag powder; use a ball mill to ball mill the above boron-rich slag powder at a speed of 120r / min for 72h , until the raw material reaches below 74 μm, and then sieve with a 200-mesh standard sieve.

[0025] Mix the sieved boron-rich slag powder, aluminum-containing compound and carbon black, of which 30 g of boron-rich slag, Al(OH) 3 60g, carbon black 10g; the mixed material is placed in a polyurethane ball mill, and ball milled with anhydrous ethanol as a medium at a speed of 120r / min for 24h to ensure uniform mixing; after wet mixing, the slurry is heated with a 101-1 type electric heater The blast drying oven was air-dried at 60 °C, and the mixture was dry mixed for 4 hours after drying. Finally, the mixture was placed in a drying oven and dried at 110 °C for 3 hours, and the residual water and absolute ethanol in the mixture...

Embodiment 2

[0031] The preparation, fine grinding and screening of boron-rich slag powder are the same as in Example 1.

[0032] Mix the sieved boron-rich slag powder, aluminum-containing compound and carbon black, of which 30 g of boron-rich slag, Al(OH) 340g, carbon black 30g; the mixed material is placed in a polyurethane ball mill, and ball milled with anhydrous ethanol as a medium at a speed of 120r / min for 24h to ensure uniform mixing; after wet mixing, the slurry is heated with a 101-1 type electric heater The blast drying oven was air-dried at 60 °C, and the mixture was dry mixed for 4 hours after drying. Finally, the mixture was placed in a drying oven and dried at 110 °C for 3 hours, and the residual water and absolute ethanol in the mixture were removed to obtain a mixture. blank.

[0033] Put the mixed billet into the steel mold, and uniaxially press it into a small round billet with a diameter of about 15mm with a 769YP-15A powder tablet press under the pressure of 250MPa, a...

Embodiment 3

[0038] The preparation, fine grinding and screening of boron-rich slag powder are the same as in Example 1.

[0039] Mix the sieved boron-rich slag powder, aluminum-containing compound and carbon black, wherein 30 g of boron-rich slag, Al 2 O 3 50g, carbon black 20g; the mixed materials are placed in a polyurethane ball mill tank, and ball milled with anhydrous ethanol as a medium at a speed of 120r / min for 24h to ensure uniform mixing; after wet mixing, the slurry is heated by 101-1 type electric heating The blast drying oven was air-dried at 60 °C, and the mixture was dry mixed for 4 hours after drying. Finally, the mixture was placed in a drying oven and dried at 110 °C for 3 hours, and the residual water and absolute ethanol in the mixture were removed to obtain a mixture. blank.

[0040] Put the mixed billet into the steel mold, and uniaxially press it into a small round billet with a diameter of about 15mm with a 769YP-15A powder tablet press under the pressure of 250M...

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Abstract

The invention provides a method for preparing an MgAlON base composite material by making use of boron-rich slag, which is characterized in that: in the first step, boron-rich slag containing 30 to 40 percent of MgO is taken as main material; the massive boron-rich slag is processed into boron-rich slag powder which is then fine-ground and sieved; the sieved boron-rich slag powder is mixed with an aluminum contained compound and carbon black and made into mixed blank which is then pressed to obtain round blank; the round blank is sintered to obtain MgAlON composite powder; in the second step, the prepared MgAlON composite powder is mixed with an additive and then pressed to obtain round blank which is then sintered to obtain the MgAlON base composite material. The preparation method of MgAlON base composite material of the invention is characterized in that: metallurgical slag is utilized as raw material to prepare the MgAlON base composite material, which reduces the production cost thereof; the synthesized MgAlON base composite material has various excellent performances and can be wildly applied in such fields as metallurgy and ceramics, etc. The preparation method of the invention has simple technique, low production cost and vital significance in comprehensive utilization of the boron-rich slag.

Description

technical field [0001] The invention belongs to the technical field of material science, and particularly relates to a method for preparing a MgAlON-based composite material by utilizing boron-rich slag. Background technique [0002] MgAlON (magnesium alon) can be regarded as MgO or MgAl 2 O 4 The solid solution formed by the solid solution into the γ-AlON lattice has a spinel structure and belongs to the cubic crystal system. MgAlON material has many excellent properties, and recent research has been proved from theory and production application, composite refractory material developed by using MgAlON as bonding phase may become a new type of high-performance refractory material. MgAlON is a typical nitrogen oxide material, which has poor wettability to molten iron, good corrosion resistance to molten slag even with high alkalinity and high FeO content, low thermal expansion coefficient, and excellent corrosion resistance. Good thermal shock stability. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 薛向欣刘然姜涛段培宁
Owner NORTHEASTERN UNIV
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