阅读说明：本技术 一种长水口及其制备方法 (Long nozzle and preparation method thereof ) 是由 周九喜 张红霞 高广泽 钱晓飞 宋振亚 张美杰 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种长水口及其制备方法,包括本体和渣线,所述本体按重量百分比如下：棕刚玉36＃10-20%,棕刚玉80＃10-20%,棕刚玉180＃20-30%,石英5-10%,石墨198 10-20%,石墨895 5-10%,添加剂3-5%,结合剂10%-15%,渣线按重量百分比：白刚玉36＃10-20%,白刚玉80＃10-20%,白刚玉180＃10-20%,白刚玉325＃5-10%,石英5-12%,石墨198 10-20%,石墨895 10-20%,添加剂5-10%,结合剂10%-15%,本发明采用棕刚玉颗粒作为本体材料骨料,其致密度、抗侵蚀性和均匀度优异,石墨韧性好,物理化学性能优,具有良好的耐高温,自润滑、传导、抗热震、耐腐蚀等多种性能,石英具有抗热冲击性好,有较高的机械强度和耐酸性保护,化学性能好的优点。(The invention discloses a long nozzle and a preparation method thereof, wherein the long nozzle comprises a body and a slag line, and the body comprises the following components in percentage by weight: brown corundum 36 # 10-20%, brown corundum 80 # 10-20%, brown corundum 180 # 20-30%, quartz 5-10%, graphite 19810-20%, graphite 8955-10%, additive 3-5%, binder 10-15%, slag line according to weight percentage: the present invention adopts brown corundum granules as main body material aggregate, and has the advantages of excellent compactness, excellent corrosion resistance and uniformity, good graphite toughness, excellent physical and chemical properties, good high temperature resistance, self-lubricating property, conduction, thermal shock resistance, corrosion resistance, etc., and the quartz has the advantages of good thermal shock resistance, high mechanical strength, high acid resistance protection and good chemical properties.)

1. The long nozzle is characterized by comprising a body and a slag line, wherein the body comprises the following components in percentage by weight:

brown corundum 36 # 10-20%

Brown corundum 80 # 10-20%

Brown corundum 180 # 20-30%

5 to 10 percent of quartz

19810-20% of graphite

8955-10% of graphite

3 to 5 percent of additive

10 to 15 percent of bonding agent

The slag line comprises the following components in percentage by weight:

white corundum 36 # 10-20%

White corundum 80 # 10-20%

White corundum 180 # 10-20%

White corundum 325 # 5-10%

5 to 12 percent of quartz

19810-20% of graphite

89510-20% of graphite

Additive 5-10%

10 to 15 percent of bonding agent

A long nozzle as claimed in claim 1, comprising; the body comprises the following components in percentage by weight:

brown corundum 36 # 15%

Brown corundum No. 80 to 15%

Brown corundum 180 # 30%

5% of quartz

Graphite-19510%

89510 percent of graphite

Additive 5%

10 percent of binder

The slag line comprises the following components in percentage by weight:

white corundum 36 # 20%

White corundum 80 # 20%

White corundum 180 # 15%

White corundum 325 # 5%

5% of quartz

19810 percent of graphite

89510 percent of graphite

Additive 5%

10 percent of binder

A long nozzle as claimed in claim 1, wherein: the thickness of the graphite 198 and the graphite 895 is 5-10 μm.

2. The preparation method of the long nozzle is characterized by comprising the following steps;

s1, blending; proportioning the long nozzle body and the slag line according to respective formula by weight percentage;

s2, mixing materials; respectively putting the long nozzle block and the slag line raw materials into respective mixing mills to be fully and uniformly mixed to obtain pug;

s3, volatilizing; drying the pug at 60 ℃ until the volatile component is 0.8-1.4%;

s4, ageing; standing the pug for 12-24 hours at constant temperature;

s5, charging and pressing; adding the dried pug into respective dies, and pressing and molding by a friction press;

s6, drying; baking the sample after compression molding at 200 ℃ for 24 hours;

s7, firing; vacuum firing is carried out on the sample, and the firing temperature is 1050 ℃;

s8, sampling inspection; carrying out flaw detection on the fired sample;

s9, secondary drying; and (4) coating an anti-oxidation layer on a sample without a problem after detection, and drying for the second time.

3, S10, warehousing the finished product; and after secondary drying and cooling, adhering ceramic fiber paper, packaging and warehousing.

4. A method of making a long nozzle as claimed in claim 3, wherein: the temperature of the mixer in the step S2 is 30-60 ℃.

5. A method of making a long nozzle as claimed in claim 3, wherein: and S5, pressing and forming the pug by a 600-ton friction press.

Technical Field

The invention belongs to the technical field of long nozzles, and particularly relates to a long nozzle and a preparation method thereof.

Background

In the process of continuous casting in the modern metallurgical process, when molten steel is injected into a tundish from a steel ladle, in order to avoid oxidation and splashing of the molten steel and ensure stable quality of molten steel components and casting blanks, a long refractory material nozzle for a tubular function is usually required to be arranged between the steel ladle and the tundish in the flow, and is one of key refractory materials used for a final connection end of a steel-making process, so that the service life and the stability of the material have great influence on the continuous casting productivity and the quality of the casting blanks.

The conventional method for preparing the long nozzle in the prior art is that a body material and a slag line material are one material, and the adopted refractory material is unreasonable in composition and components, so that the product is poor in high temperature resistance and thermal shock resistance, and is low in erosion resistance and thermal shock strength, so that the long nozzle product is short in service life, low in mechanical strength and unqualified in casting blank quality.

Disclosure of Invention

In order to solve the above problems, the present invention provides the following technical solutions: the steel wire comprises a body and a slag line, wherein the body comprises the following components in percentage by weight:

brown corundum 36 # 10-20%

Brown corundum 80 # 10-20%

Brown corundum 180 # 20-30%

5 to 10 percent of quartz

19810-20% of graphite

8955-10% of graphite

3 to 5 percent of additive

10-15% of a binding agent.

The slag line comprises the following components in percentage by weight:

white corundum 36 # 10-20%

White corundum 80 # 10-20%

White corundum 180 # 10-20%

White corundum 325 # 5-10%

5 to 12 percent of quartz

19810-20% of graphite

89510-20% of graphite

Additive 5-10%

10-15% of a binding agent.

Further, the preferable weight percentages of the body are as follows:

brown corundum 36 # 15%

Brown corundum No. 80 to 15%

Brown corundum 180 # 30%

5% of quartz

Graphite-19510%

89510 percent of graphite

Additive 5%

10% of a binding agent.

The preferable weight percentage of the slag line is as follows:

white corundum 36 # 20%

White corundum 80 # 20%

White corundum 180 # 15%

White corundum 325 # 5%

5% of quartz

19810 percent of graphite

89510 percent of graphite

Additive 5%

10% of a binding agent.

Further, the thickness of the graphite 198 and the graphite 895 are both 5-10 μm

The invention provides a preparation method of a long nozzle in the scheme, which comprises the following steps;

s1, blending; proportioning the long nozzle body and the slag line according to respective formula by weight percentage;

s2, mixing materials; respectively putting the long nozzle block and the slag line raw materials into respective mixing mills to be fully and uniformly mixed to obtain pug;

s3, volatilizing; drying the pug at 60 ℃ until the volatile component is 0.8-1.4%;

s4, ageing; standing the pug for 12-24 hours at constant temperature;

s5, charging and pressing; adding the dried pug into respective dies, and pressing and molding by a friction press;

s6, drying; baking the sample after compression molding at 200 ℃ for 24 hours;

s7, firing; vacuum firing is carried out on the sample, and the firing temperature is 1050 ℃;

s8, sampling inspection; carrying out flaw detection on the fired sample;

s9, secondary drying; and (4) coating an anti-oxidation layer on a sample without a problem after detection, and drying for the second time.

S10, warehousing the finished product; and after secondary drying and cooling, adhering ceramic fiber paper, packaging and warehousing.

Further, the temperature of the mixer in the step S2 is 30 to 60 ℃.

Further, the step S5 is to press the pug into shape by a 600 ton friction press.

According to the long nozzle, the brown corundum particles and the white corundum particles are used as the aggregate of the body and the slag line material, the density, the erosion resistance and the uniformity are excellent, the organization structure is improved by the brown corundum and the white corundum according to the reasonable particle grading, the erosion resistance is improved, the content of the brown corundum particles and the content of the white corundum particles can improve the normal-temperature pressure resistance, the breaking strength and the high-temperature precipitation resistance of the material, and especially when the content of the brown corundum and the white corundum of the body and the slag line in the total ratio of the components is increased from 40% to 60%, the erosion resistance of the material can be improved by about 25%. In addition, the whole components of the graphite are limited to 20-30% by adjusting the content and the thickness of the graphite, the components of the graphite are not more than 30%, otherwise, the corrosion resistance of the long nozzle is reduced after the content of C of the long nozzle is increased, but not less than 20%, because the graphite does not infiltrate into molten steel, nodules can be reduced, the thermal shock stability is improved, the high thermal shock stability is reduced when the content is too low, in addition, the thermal shock stability of the long nozzle can be further greatly improved, the sintering temperature is balanced, and the bonding strength of the graphite is enhanced by reducing the thickness of the graphite.

The invention provides a preparation method of a long nozzle, wherein the ageing time is 12-24 hours, the ageing time is properly prolonged, the mutual combination of mixed materials is more uniform, the plasticity and the combination performance of a binding agent are fully exerted, the forming performance of a blank is improved, and the product has excellent thermal shock stability by matching with a specific process, so that the service life of the long nozzle is greatly prolonged.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

Example 1

The long nozzle comprises a body and a slag line, wherein the body comprises the following components in percentage by weight:

brown corundum 36 # 20%

Brown corundum No. 80 # 20%

Brown corundum 180 # 20%

5% of quartz

Graphite-19510%

8955 percent of graphite

Additive 5%

15 percent of binding agent

The slag line comprises the following components in percentage by weight:

white corundum 36 # 20%

White corundum 80 # 20%

White corundum 180 # 10%

White corundum 325 # 10%

5% of quartz

19810 percent of graphite

89510 percent of graphite

Additive 5%

10 percent of binder

The thickness of the graphite 198 and the graphite 895 in the components of the body and the slag line is 5-10 μm.

The preparation method comprises the following steps:

s1, blending; proportioning the long nozzle body and the slag line according to respective formula by weight percentage;

s2, mixing materials; respectively putting the long nozzle block and the slag line raw materials into respective mixing mills to be fully and uniformly mixed to obtain pug;

s3, volatilizing; drying the pug at 60 ℃ until the volatile content is 0.8%;

s4, ageing; standing the pug for 12 hours at constant temperature;

s5, charging and pressing; adding the dried pug into a die, and pressing and molding the pug by a 600-ton friction press;

s6, drying; baking the sample after compression molding at 200 ℃ for 24 hours;

s7, firing; vacuum firing is carried out on the sample, and the firing temperature is 1050 ℃;

s8, sampling inspection; carrying out flaw detection on the fired sample;

s9, secondary drying; and (4) coating an anti-oxidation layer on a sample without a problem after detection, and drying for the second time.

S10, warehousing the finished product; and after secondary drying and cooling, adhering ceramic fiber paper, packaging and warehousing.

The embodiment has better thermal shock stability and strength and longer service life, and the test results of the finished product are shown in tables 1 and 2.

Example 2

The long nozzle comprises a body and a slag line, wherein the body comprises the following components in percentage by weight:

brown corundum 36 # 15%

Brown corundum No. 80 to 15%

Brown corundum 180 # 30%

5% of quartz

Graphite-19510%

89510 percent of graphite

Additive 5%

10 percent of binder

The slag line comprises the following components in percentage by weight:

white corundum 36 # 20%

White corundum 80 # 20%

White corundum 180 # 15%

White corundum 325 # 5%

5% of quartz

19810 percent of graphite

89510 percent of graphite

Additive 5%

10 percent of binder

The thickness of the graphite 198 and the graphite 895 in the components of the body and the slag line is 5-10 μm.

The preparation method comprises the following steps:

s1, blending; proportioning the long nozzle body and the slag line according to respective formula by weight percentage;

s2, mixing materials; respectively putting the long nozzle block and the slag line raw materials into respective mixing mills to be fully and uniformly mixed to obtain pug;

s3, volatilizing; drying the pug at 60 ℃ until the volatile content is 0.8%;

s4, ageing; standing the pug for 12 hours at constant temperature;

s5, charging and pressing; adding the dried pug into a die, and pressing and molding the pug by a 600-ton friction press;

s6, drying; baking the sample after compression molding at 200 ℃ for 24 hours;

s7, firing; vacuum firing is carried out on the sample, and the firing temperature is 1050 ℃;

s8, sampling inspection; carrying out flaw detection on the fired sample;

s9, secondary drying; and (4) coating an anti-oxidation layer on a sample without a problem after detection, and drying for the second time.

S10, warehousing the finished product; and after secondary drying and cooling, adhering ceramic fiber paper, packaging and warehousing.

The embodiment has better thermal shock stability and strength and longer service life, and the test results of the finished product are shown in Table 1.

Example 3

The long nozzle comprises a body and a slag line, wherein the body comprises the following components in percentage by weight:

brown corundum 36 # 10%

Brown corundum No. 80 # 20%

Brown corundum 180 # 30%

Quartz content of 10%

Graphite-19510%

8955 percent of graphite

Additive 5%

10 percent of binder

The slag line comprises the following components in percentage by weight:

white corundum 36 # 20%

White corundum No. 80 to 10 percent

White corundum 180 # 20%

White corundum 325 # 10%

5% of quartz

19810 percent of graphite

89510 percent of graphite

Additive 5%

10 percent of binder

The thickness of the graphite 198 and the graphite 895 in the components of the body and the slag line is 5-10 μm.

The preparation method comprises the following steps:

s1, blending; proportioning the long nozzle body and the slag line according to respective formula by weight percentage;

s2, mixing materials; respectively putting the long nozzle block and the slag line raw materials into respective mixing mills to be fully and uniformly mixed to obtain pug;

s3, volatilizing; drying the pug at 60 ℃ until the volatile content is 0.8%;

s4, ageing; standing the pug for 12 hours at constant temperature;

s5, charging and pressing; adding the dried pug into a die, and pressing and molding the pug by a 600-ton friction press;

s6, drying; baking the sample after compression molding at 200 ℃ for 24 hours;

s7, firing; vacuum firing is carried out on the sample, and the firing temperature is 1050 ℃;

s8, sampling inspection; carrying out flaw detection on the fired sample;

s9, secondary drying; and (4) coating an anti-oxidation layer on a sample without a problem after detection, and drying for the second time.

S10, warehousing the finished product; and after secondary drying and cooling, adhering ceramic fiber paper, packaging and warehousing.

The embodiment has better thermal shock stability and strength and longer service life, and the test results of the finished product are shown in Table 1.

Table 1: the performance of the products obtained in examples 1-3 of the product and comparative examples 1-2 of the common product was tested.

	Normal temperature compressive strength (Mpa)	Normal temperature rupture strength (Mpa)	Erosion Rate (mm/h)	Thermal shock resistance	Service life (h)
						Example 1	19.4	7.5	0.09	7	45
Example 2	22.7	8.2	0.11	9	39
						Example 3	21.5	8.1	0.10	9	43
Comparative example 1	13.6	5.4	0.22	3	19
						Comparative example 2	12.9	5.8	0.20	2	17

As can be seen from Table 1, the normal-temperature compressive strength and the normal-temperature rupture strength of the product are obviously higher than those of common products, the erosion rate of the product is further reduced, the product has better erosion resistance, the thermal shock resistance of the product is also better improved, and the service life of the product is greatly prolonged through good particle-component ratio.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.