CN107010926A

CN107010926A - A kind of preparation method of metallurgical casting water nozzle brick

Info

Publication number: CN107010926A
Application number: CN201710337118.7A
Authority: CN
Inventors: 石磊; 杨阳; 孙冬
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-05-14
Filing date: 2017-05-14
Publication date: 2017-08-04

Abstract

The invention discloses a kind of preparation method of metallurgical casting water nozzle brick, belong to nozzle brick preparing technical field.The present invention is first by zircon, bauxite, calcination processing is incubated after the sieving of anthracite mix grinding, nitridation zirconia-based ceramic is made in ground sieving again, then by the ground sieve series that shakes of white fused alumina obtain level with after white fused alumina with fused magnesite, hydraulic press, which is put into, after the mixings such as nitridation zirconia-based ceramic is pressed into nozzle brick crude green body, it will be transferred to again after crude green body forced air drying in rotary kiln and be fired into multiple phase refractory material, most metallurgical casting water nozzle brick can be obtained through cooling afterwards, nozzle brick produced by the present invention has structural strength high, it is anti-oxidant, anti-erosion, the characteristics of thermal shock resistance is excellent and wear resistance at elevated temperature is splendid, crackle is less prone to during use, safety durable, effectively increase the service life of nozzle brick.

Description

A kind of preparation method of metallurgical casting water nozzle brick

Technical field

The invention belongs to technical field of fire-resistant material preparation, and in particular to a kind of preparation side of metallurgical casting water nozzle brick Method.

Background technology

Developed rapidly and the progressively improvement of the management condition crisis of whole industry at present with steel, people are to centre The use condition of bag metering nozzle and tundish upper nozzle brick becomes increasingly harsh.In order to improve the life-span of nozzle brick, that is, work as When nozzle brick is in contact with molten steel, it is necessary to prevent it from being reacted with molten steel and slag.The damage of nozzle brick, not only due to The chemical action of molten steel and slag, and due to crackle and peeling and the abrasion of molten steel etc. caused by the quick thermal shock of molten steel Physical action.Therefore in order that nozzle brick can be operated stably, it is necessary to be used to manufacture water using the refractory material of excellent performance Mouth brick.

At present the production technology of metallurgical casting water nozzle brick mainly by auxiliary agent be directly added into smelting furnace with base-material melting, Product is directly come out of the stove natural cooling after melting, and being directly incorporated binding agent through the broken powder for being worked into certain particle size is made the mouth of a river Brick.Conventional nozzle brick has the four major class materials such as aluminium carbon, aluminium zirconium carbon, magnesia, corundum at present.However, these nozzle brick high temperature antioxygens Change poor-performing, not only easily cause short texture, be also easily caused slag corrosion resistance ability and significantly decline, service life shortens, General to be only capable of using 20~40 times or so, and nozzle brick low intensity, heat-resistant knocking stability is poor, and brick body easily occurs during use , there is severe compromise in crackle.

With the development of process for making, nozzle brick requirement is increasingly improved, especially to heat shock resistance, anti-erosion, high temperature Structural strength and wear resistance at elevated temperature propose requirements at the higher level.It would therefore be highly desirable to develop it is a kind of have excellent anti-oxidant, slag corrosion resistance, Thermal shock resistance, and the mouth of a river brick product of high mechanical strength.

The content of the invention

Present invention mainly solves technical problem：It is poor for existing nozzle brick high-temperature oxidation resistance, it is easily caused Short texture and slag corrosion resistance ability significantly decline, and nozzle brick low intensity, and there is provided one for the poor defect of heat-resistant knocking stability Plant the preparation method of metallurgical casting water nozzle brick.

In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：

（1）Zircon, bauxite, anthracite is taken to be fitted into ball milling in ball mill, sieving, calcining, zirconium base must be nitrogenized by being ground after cooling Ceramics；

（2）White fused alumina grinding sieving is taken, particle diameter is filtered out for 1~3mm, 0.74~1.00mm, 0.45~0.74mm grains at different levels White fused alumina is spent, and is configured to level with white fused alumina；

（3）Count by weight, weigh 100~120 parts of levels with white fused alumina, 100~120 parts of fused magnesites, 50~52 parts of electric smelting Magnesium aluminate spinel, 18~20 parts of kaolin, 7~10 parts of titanium dioxide, 7~10 parts of nitridation zirconia-based ceramics, 5~8 parts of silica flours, 5~8 Part graphite powder, 10~12 parts of phenolic resin are fitted into 10~15min of mixing in kneading machine, obtain compound；

（4）Compound is fitted into hydraulic press, crude green body is pressed into 200~250MPa pressure, and is formed by a firing, metallurgical casting is obtained Water nozzle brick.

Step（1）Described zircon, bauxite, anthracitic parts by weight are 90~108 parts of zircons, 10~12 parts of aluminium Alumina, 32~35 parts of anthracites.

Step（1）Described calcination process calcines 3~4h under nitrogen atmosphere, to be heated to 1500~1600 DEG C of insulations.

Step（2）Described level is made up of with white fused alumina following weight parts white fused alumina：210~250 parts of particle diameters are 1~3mm White fused alumina, 420~500 parts of particle diameters are 0.74~1.00mm white fused alumina, and 420~500 parts of particle diameters are 0.45~0.74mm's White fused alumina.

Step（4）Described forms by a firing process nozzle brick crude green body is placed in air dry oven, at 180~220 DEG C 10~12h of lower drying, then be transferred in rotary kiln, 8~10h is fired at 1600~1750 DEG C.

The beneficial effects of the invention are as follows：The present invention is incubated after zircon, bauxite and anthracite mix grinding sieve first and forged Burning processing, then it is ground sieving be made nitridation zirconia-based ceramic, then by white fused alumina it is ground shake sieve series into level match somebody with somebody white fused alumina after with Hydraulic press is put into after the mixings such as fused magnesite, nitridation zirconia-based ceramic and is pressed into nozzle brick crude green body, then will be turned after crude green body forced air drying Enter and multiple phase refractory material is fired into rotary kiln, most can obtain metallurgical casting water nozzle brick through cooling afterwards, the present invention is by by nitrogen Change the sub-micro space that zirconia-based ceramic micro mist is filled into nozzle brick, reduce the porosity and air vent aperture, reduce the logical of nozzle brick Road, while forming spinelle with oxidation reactive aluminum at high temperature, produces the barrier layer that volumetric expansion forms densification, effectively prevents The infiltration of steam state or liquid alloy element, making the anti-permeability performance of nozzle brick significantly improves, and obtained nozzle brick has structure Intensity is high, and anti-oxidant, anti-erosion, thermal shock resistance are excellent, and the characteristics of wear resistance at elevated temperature is splendid is less prone to during use and split Line, safety durable effectively increases the service life of nozzle brick, with splendid application prospect.

Embodiment

For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art are it will be clearly understood that the implementation Example is only to aid in understanding the present invention, is not construed as the concrete restriction to the present invention.

90~108g zircons are weighed, 10~12g bauxites, 32~35g anthracites are fitted into ball mill, with 300~ 400r/min 1~2h of ball milling, cross 200 mesh sieves, the composite powder after sieving are fitted into Muffle furnace, under nitrogen atmosphere, heating To 1500~1600 DEG C of insulation 3~4h of calcining, it is cooled to after room temperature to be fitted into grinder and grinds, cross 200 mesh sieves, obtain nitridation zirconium base Ceramics, weigh 3~4kg white fused aluminas, are fitted into grinder and grind, then are transferred in vibrating sieving machine, and particle diameter is filtered out respectively for 1~3mm, 0.74~1.00mm, 0.45~0.74mm powder, obtain granularity white fused aluminas at different levels, and it is 1~3mm's to weigh 210~250g particle diameters White fused alumina, 420~500g particle diameters are 0.74~1.00mm white fused alumina, and 420~500g particle diameters are the white firm of 0.45~0.74mm Jade, obtains level after being well mixed and matches somebody with somebody white fused alumina, then counts by weight, weighs 100~120 parts of levels with white fused alumina, 100~120 parts Cross the fused magnesite of 200 mesh sieves, the electric melting magnesium aluminum spinel of 50~52 parts of mesh sieves of mistake 200, the kaolinite of 18~20 parts of mesh sieves of mistake 300 Soil, the titanium dioxide of 7~10 parts of mesh sieves of mistake 200,7~10 parts of nitridation zirconia-based ceramic, the silica flour of 5~8 parts of mesh sieves of mistake 300,5~ The graphite powder of 8 parts of mesh sieves of mistake 300,10~12 parts of phenolic resin are fitted into 10~15min of mixing in kneading machine, obtain compound, then will Compound is fitted into hydraulic press, compressing with 200~250MPa pressure, obtains nozzle brick crude green body, then puts nozzle brick crude green body In air dry oven, 10~12h is dried at 180~220 DEG C, is finally transferred in rotary kiln, burnt at 1600~1750 DEG C 8~10h is made, is cooled to after room temperature and obtains metallurgical casting water nozzle brick.

Example 1

90g zircons are weighed, 10g bauxites, 32g anthracites are fitted into ball mill, with 300r/min ball milling 1h, cross 200 mesh Sieve, the composite powder after sieving is fitted into Muffle furnace, under nitrogen atmosphere, is heated to 1500 DEG C of insulation calcining 3h, is cooled to It is fitted into after room temperature in grinder and grinds, crosses 200 mesh sieves, obtain nitridation zirconia-based ceramic, weigh 3kg white fused aluminas, be fitted into grinder and grind Mill, then be transferred in vibrating sieving machine, particle diameter is filtered out respectively for 1mm, 0.74mm, 0.45mm powder obtains granularity white fused aluminas at different levels, claim The white fused alumina that 210g particle diameters are 1mm is taken, 420g particle diameters are 0.74mm white fused alumina, and 420g particle diameters are 0.45mm white fused alumina, are mixed Level is obtained after closing uniformly and matches somebody with somebody white fused alumina, then is counted by weight, weighs 100 parts of levels with white fused alumina, the electric smelting of 100 parts of mesh sieves of mistake 200 Magnesia, the electric melting magnesium aluminum spinel of 50 parts of mesh sieves of mistake 200, the kaolin of 18 parts of mesh sieves of mistake 300, the titanium dioxide of 7 parts of mesh sieves of mistake 200 Titanium, 7 parts of nitridation zirconia-based ceramic, the silica flour of 5 parts of mesh sieves of mistake 300, the graphite powder of 5 parts of mesh sieves of mistake 300,10 parts of phenolic resin, dress Enter and 10min is kneaded in kneading machine, obtain compound, then compound is fitted into hydraulic press, it is compressing with 200MPa pressure, obtain water Nozzle brick crude green body, is then placed in air dry oven by mouth brick crude green body, and 10h is dried at 180 DEG C, is finally transferred in rotary kiln, 8h is fired at 1600 DEG C, is cooled to after room temperature and obtains metallurgical casting water nozzle brick.

Example 2

99g zircons are weighed, 11g bauxites, 34g anthracites are fitted into ball mill, with 350r/min ball milling 1h, cross 200 mesh Sieve, the composite powder after sieving is fitted into Muffle furnace, under nitrogen atmosphere, is heated to 1550 DEG C of insulation calcining 3h, is cooled to It is fitted into after room temperature in grinder and grinds, crosses 200 mesh sieves, obtain nitridation zirconia-based ceramic, weigh 3kg white fused aluminas, be fitted into grinder and grind Mill, then be transferred in vibrating sieving machine, particle diameter is filtered out respectively for 2mm, 0.87mm, 0.61mm powder obtains granularity white fused aluminas at different levels, claim The white fused alumina that 230g particle diameters are 2mm is taken, 460g particle diameters are 0.87mm white fused alumina, and 460g particle diameters are 0.61mm white fused alumina, are mixed Level is obtained after closing uniformly and matches somebody with somebody white fused alumina, then is counted by weight, weighs 110 parts of levels with white fused alumina, the electric smelting of 110 parts of mesh sieves of mistake 200 Magnesia, the electric melting magnesium aluminum spinel of 51 parts of mesh sieves of mistake 200, the kaolin of 19 parts of mesh sieves of mistake 300, the titanium dioxide of 9 parts of mesh sieves of mistake 200 Titanium, 9 parts of nitridation zirconia-based ceramic, the silica flour of 7 parts of mesh sieves of mistake 300, the graphite powder of 7 parts of mesh sieves of mistake 300,11 parts of phenolic resin, dress Enter and 13min is kneaded in kneading machine, obtain compound, then compound is fitted into hydraulic press, it is compressing with 225MPa pressure, obtain water Nozzle brick crude green body, is then placed in air dry oven by mouth brick crude green body, and 11h is dried at 200 DEG C, is finally transferred in rotary kiln, 9h is fired at 1675 DEG C, is cooled to after room temperature and obtains metallurgical casting water nozzle brick.

Example 3

108g zircons are weighed, 12g bauxites, 35g anthracites are fitted into ball mill, with 400r/min ball milling 2h, cross 200 mesh Sieve, the composite powder after sieving is fitted into Muffle furnace, under nitrogen atmosphere, is heated to 1600 DEG C of insulation calcining 4h, is cooled to It is fitted into after room temperature in grinder and grinds, crosses 200 mesh sieves, obtain nitridation zirconia-based ceramic, weigh 4kg white fused aluminas, be fitted into grinder and grind Mill, then be transferred in vibrating sieving machine, particle diameter is filtered out respectively for 3mm, 1.00mm, 0.74mm powder obtains granularity white fused aluminas at different levels, claim The white fused alumina that 250g particle diameters are 3mm is taken, 500g particle diameters are 1.00mm white fused alumina, and 500g particle diameters are 0.74mm white fused alumina, are mixed Level is obtained after closing uniformly and matches somebody with somebody white fused alumina, then is counted by weight, weighs 120 parts of levels with white fused alumina, the electric smelting of 120 parts of mesh sieves of mistake 200 Magnesia, the electric melting magnesium aluminum spinel of 52 parts of mesh sieves of mistake 200, the kaolin of 20 parts of mesh sieves of mistake 300, the dioxy of 10 parts of mesh sieves of mistake 200 Change titanium, 10 parts of nitridation zirconia-based ceramic, the silica flour of 8 parts of mesh sieves of mistake 300, the graphite powder of 8 parts of mesh sieves of mistake 300,12 parts of phenolic resin, It is fitted into kneading machine and kneads 15min, obtain compound, then compound is fitted into hydraulic press, it is compressing with 250MPa pressure, obtain Nozzle brick crude green body, is then placed in air dry oven by nozzle brick crude green body, and 12h is dried at 220 DEG C, rotary kiln is finally transferred to In, 10h is fired at 1750 DEG C, is cooled to after room temperature and obtains metallurgical casting water nozzle brick.

Performance test is carried out to metallurgical casting water nozzle brick made from example 1~3 and common nozzle brick, its testing result is such as Under：

Detection project	Common nozzle brick	Example 1	Example 2	Example 3
					Bulk density（g/cm³）	3.8	4.9	5.2	5.8
Apparent porosity（%）	5.8	3.2	2.8	2.3
					Compressive resistance（MPa）	125.6	130.2	136.7	142.4
Rupture strength（MPa）	48.9	53.1	58.7	62.3
					Refractory temperature（℃）	1530	1800	1950	2100
Usage cycles（It is secondary）	≤50	≥55	≥62	≥70

Above-described embodiment is not limited for the present invention preferably embodiment, but embodiments of the present invention by above-described embodiment System, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification, Equivalent substitute mode is should be, is included within protection scope of the present invention.

Claims

1. a kind of preparation method of metallurgical casting water nozzle brick, it is characterised in that specifically preparation process is：

2. a kind of preparation method of metallurgical casting water nozzle brick as claimed in claim 1, it is characterised in that step（1）It is described Zircon, bauxite, anthracitic parts by weight be 90~108 parts of zircons, 10~12 parts of bauxites, 32~35 parts smokeless Coal.

3. a kind of preparation method of metallurgical casting water nozzle brick as claimed in claim 1, it is characterised in that step（1）It is described Calcination process under nitrogen atmosphere, be heated to 1500~1600 DEG C of 3~4h of insulation calcining.

4. a kind of preparation method of metallurgical casting water nozzle brick as claimed in claim 1, it is characterised in that step（2）It is described Level be made up of with white fused alumina following weight parts white fused alumina：The white fused alumina that 210~250 parts of particle diameters are 1~3mm, 420~500 parts Particle diameter is 0.74~1.00mm white fused alumina, the white fused alumina that 420~500 parts of particle diameters are 0.45~0.74mm.

5. a kind of preparation method of metallurgical casting water nozzle brick as claimed in claim 1, it is characterised in that step（4）It is described Form by a firing process for nozzle brick crude green body is placed in air dry oven, 10~12h is dried at 180~220 DEG C, then be transferred to In rotary kiln, 8~10h is fired at 1600~1750 DEG C.