CN1021305C - Mg-cr refractory paint for continuous casting tundishes - Google Patents
Mg-cr refractory paint for continuous casting tundishes Download PDFInfo
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- CN1021305C CN1021305C CN 90105890 CN90105890A CN1021305C CN 1021305 C CN1021305 C CN 1021305C CN 90105890 CN90105890 CN 90105890 CN 90105890 A CN90105890 A CN 90105890A CN 1021305 C CN1021305 C CN 1021305C
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- coating
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Abstract
The present invention provides Mg-Cr refractory paint for continuously casting tundishes, which is compounded from 55.5 to 81 wt% of magnesium sand, 17 to 25 wt% of chromite, 0.5 to 5 wt% of sodium polyphosphate, 0.2 to 3 wt% of organic acid, 1 to 10 wt% of refractory clay and 0.3 to 1.5 wt% of borate. The paint has the advantages of high adhesive performance, long solidifying time, etc. The present invention can realize dry-lining painting during construction, the paint can be modulated into paste and can not be solidified in 4 to 6 hours, and the dry paint can be preserved for 6 months without block generation.
Description
What the present invention relates to is a kind of continuous casting tundish magnesium chromium matter fireproof coating.
Tundish is a visual plant during continuous casting is produced, and its liner design has three classes: brick lining, coating lining and heat-insulating shield lining.Brick working lining can't be removed the residual steel residue in the bag after because of usefulness, has to whole working linings are removed heavily and builds, and the refractory consumption rate amount is big, the labour intensity height, and turnaround speed is slow.Adopt heat-insulating shield to carry out cold bag cast, can energy savings, realize many stoves connect around, but cost is higher, contaminated environment.Adopt brick-coating lining, produce simple and easy, convenient, cost is low.China's " refractory material " third phase in 1979 goes up and to propose magnesium chromium matter tundish paint in " development and the service test of magnesium chromium matter tundish paint " literary composition of publication is that to be with magnesia and chromite that primary raw material adds chemical ceramics bond and polyphosphate sodium and fire clay formulated.Because the limitation of fire clay plasticity and cementability causes the cementability of coating poor, the age-hardening time can only keep 45-50 minute, the situation that ladle coating has hardened often occurred.Because the short storage life that also has influence on product of age-hardening time.This coating seals the back under polybag external application braid over braid Packing Condition, southern area storage life 2 months, northern area 3 months after adorning with plastic tape.
In view of above reason, the objective of the invention is provides a kind of continuous casting tundish magnesium chromium matter fireproof coating in order to improve coating cementability and prolongation timeliness hardening time.
Continuous casting tundish of the present invention is made of following component (weight %) with magnesium chromium matter fireproof coating:
Magnesia 55.5-81
Chromite 17-25
Polymerization of sodium phosphate 0.5-5
Organic acid 0.2-3
Fire clay 1-10
Borate 0.3-1.5
In above prescription, magnesia is primary raw material, polymerization of sodium phosphate and fire clay are as bond, plasticity is strong, borate has very high surface activity and don't reacts with polymerization of sodium phosphate and the refractoriness that reduces coating improves the cementability of coating, because coating is magnesia more than 55% in the middle of the magnesium chromium matter, main component is MgO, the bond that coating is selected for use is a polymerization of sodium phosphate, both form body of paste as construction coating under the blending of 10% left and right sides moisture, complex chemical reaction formation complex compound takes place in polymer phosphate sodium water solution and MgO and gel is solidified, organic acid is added in the coating as set retarder for this reason, around MgO, form wrap film, delay complex reaction speed, reach retarding effect, in the present invention's prescription, add the cementability that borate can improve coating, polymerization of sodium phosphate can be sodium pyrophosphate or calgon or two polyphosphate sodiums or sodium phosphate trimer or sodium tetrapolyphosphate, and is wherein best with the coating mechanical property of sodium phosphate trimer combination.
Above-mentioned organic acid can be that citric acid also can be oxalic acid or tartaric acid or butanedioic acid, wherein adds retarding effect the best in the coating with oxalic acid.
Above-mentioned borate can be that boric anhydride also can be sodium tetraborate or industrial borax, improves the cementability of coating.
Continuous casting tundish of the present invention has been with having added set retarder-organic acid and bonding agent-borate in the magnesium chromium matter fireproof coating, improved the adhesive property of coating and prolonged timeliness hardening time.Can realize doing lining during construction and smear, also can be with coating furnishing paste, can be with the age-hardening time lengthening of paste coating 6-8 hour, the storage time: southern area is more than 6 months, and northern area is (referring to table 1, table 2, table 3) more than 8 months.
Table 1: add chemistry and help bond to improve the spreading property contrast.(table is seen the literary composition back)
Table 1 test is 6 tons with middle ladleful, artificial mix coating, and baking temperature is 1000 ℃, 2 hours heating-up times.
Table 1 data declaration does not add No. 1 paint formulation that sodium tetraborate helps bond, and dried lining is smeared difficulty, the coating 40-50% that comes off after 1000 ℃ of bakings in 2 hours, and result of use is not good.Realize all that along with helping the bond sodium tetraborate to add adjusted prescription dried lining scribble effect is good.
Table 2: add set retarder and prolong timeliness curing and storage chronergy (table 2 is seen the literary composition back)
Table 2 experimental condition such as table 1.Data show in the table 2: do not add No. 1 prescription of set retarder oxalic acid, and paste coating sclerosis in 1 hour, the dried shape coating storage time is 1 month.And No. 2, No. 3, No. 4 prescriptions that add set retarder have reached and have prolonged the timeliness solidification effect preferably.
Table 3: add and help bond, back to coagulate agent spreading property contrast (table 3 is seen the literary composition back)
The experimental condition such as the table 1 of table 3.
Each component of table 1-table 3 is to adopt percentage by weight.Moisture adds for other in the table.
Embodiment 1: weight (%)
Fused magnesite (granularity 3-0 millimeter) 74
Chromite (granularity＜0.088 millimeter) 20
Fire clay 2
Calgon 2
Citric acid 1.2
Industrial borax 0.8
In embodiment 1 as need paste coating, then add 12%(weight) water get final product.
Embodiment 2:(weight %)
High-purity natural magnesia (granularity 3-0 millimeter) 58.5
High-purity natural magnesia (granularity＜0.088 millimeter) 17
Chromite (granularity＜0.088 millimeter) 15
Fire clay 6
Sodium pyrophosphate 1.5
Tartaric acid 0.8
Boron cash 1.2
In embodiment 2 as need paste coating, then adding 12%(weight) water mixes well and gets final product.
Embodiment 3(weight %)
Brickmaking magnesia (granularity 3.5-0.2 millimeter) 55
Brickmaking magnesia (granularity＜0.125 millimeters 10
Chromite (granularity＜0.088 millimeter) 25
Fire clay 6
Polymerization of sodium phosphate 2
Oxalic acid 1.5
Industrial borax 0.5
In embodiment 3 as need paste coating, then adding 14%(weight) water mixes well and gets final product.
Embodiment 4:(weight %)
Fettling magnesite grain (granularity 3.38-0.2 millimeter) 50
Fettling magnesite grain (granularity＜0.125 millimeter) 15.5
Chromite (granularity＜0.088 millimeter) 20
Fire clay 10
Sodium tetrapolyphosphate 3
Oxalic acid 0.8
Sodium tetraborate 0.7
In embodiment 4 as need paste coating, then add 16%(weight) water mix well and get final product.
Table 1
Join magnesium magnesium chromium anti-poly-four
Sand placer fire phosphorus water boron construction spreading property
The acid of square powder powder glactaric acid
Coating came off after the dried lining of the native sodium part sodium of grain was smeared the situation baking
Number powder powder
（%） （%） （%） （%） （%）
The 1 55 17 17 83 12 0 difficult 40-50% that come off that bond
2 55 16.2 17 83 12 0.8 easily bond comes off 5%
3 55 15.8 17 83 12 1.2 easy bondings do not come off, bonding
More firm
4 55 15.5 17 83 12 1.5 very easily bond bonding firmly
Table 2: add set retarder and prolong timeliness curing and storage time effect
Join the anti-poly-worker of magnesium magnesium chromium and prolong the timeliness solidification effect
Sand placer fire phosphorus water industry
Square powder powder glactaric acid grass paste coating solidifies dried shape and is coated with feed bin
The native sodium branch acid time of grain (hour) the storage time (moon)
Number powder powder
（%） （%） （%） （%） （%） （%） （%）
1 55 20 17 5 3 12 0 1 1
2 55 19 17 5 3 12 1 2 3
3 55 18.5 17 5 3 12 1.5 4 5
4 55 18 17 5 3 12 2 6 6
Table 3: add and help bond, back to coagulate the contrast of agent spreading property
Join the anti-poly-four worker's spreading properties of magnesium magnesium chromium and prolong the timeliness solidification effect
Sand placer fire phosphorus water boron industry
After doing the lining coated baking, square powder powder glactaric acid acid grass take off the dried shape coating of paste coating
The native sodium of grain divides the sodium acid situation of the smearing situation that falls to store in a warehouse the time hardening time
Number powder powder (hour) (moon)
（%） （%） （%） （%） （%） （%） （%） （%）
1 55 17 18 73 10 00 difficult bondings come off 11
40-50%
2 55 15.2 18 73 10 0.8 1 more easily come off 5% 23
Bonding
3 55 14.3 18 73 10 1.2 1.5 easy bondings do not come off 45
5 55 13.5 18 73 10 1.5 2 very easily bond 66
Bonding firm
Claims (3)
1, a kind of continuous casting tundish magnesium chromium matter fireproof coating is characterized in that the component of described fireproof coating is (weight %):
Magnesia 55.5-81
Chromite 17-25
Polymerization of sodium phosphate 0.5-5
Organic acid 0.2-3
Fire clay 1-10
Borate 0.3-1.5
2, magnesium chromium matter fireproof coating as claimed in claim 1 is characterized in that described organic acid can be that citric acid also can be oxalic acid or tartaric acid or butanedioic acid.
3, magnesium chromium matter fireproof coating as claimed in claim 1 or 2 is characterized in that described borate can be that boric anhydride also can be sodium tetraborate or industrial borax.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105890 CN1021305C (en) | 1990-09-26 | 1990-09-26 | Mg-cr refractory paint for continuous casting tundishes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105890 CN1021305C (en) | 1990-09-26 | 1990-09-26 | Mg-cr refractory paint for continuous casting tundishes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1060302A CN1060302A (en) | 1992-04-15 |
| CN1021305C true CN1021305C (en) | 1993-06-23 |
Family
ID=4879688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90105890 Expired - Fee Related CN1021305C (en) | 1990-09-26 | 1990-09-26 | Mg-cr refractory paint for continuous casting tundishes |
Country Status (1)
| Country | Link |
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| CN (1) | CN1021305C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069563C (en) * | 1998-12-21 | 2001-08-15 | 冶金工业部洛阳耐火材料研究院 | Magnesium tundish paint for conticasting steel |
| WO2020169771A1 (en) * | 2019-02-20 | 2020-08-27 | Intocast Ag | Cold-setting dry vibratable mix |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045282C (en) * | 1993-09-03 | 1999-09-29 | 中国科学院上海硅酸盐研究所 | High-compact low-porosity silicon nitride-silicon carbide-oxide system as refractory material |
| CN1045281C (en) * | 1993-09-03 | 1999-09-29 | 中国科学院上海硅酸盐研究所 | Silicon nitride combined with silicon carbide refractory material for pouring ladle gate |
| CN1093448C (en) * | 2000-01-15 | 2002-10-30 | 浙江湖州红鹰企业集团有限公司 | Magnesium paint for tundish in conticasting |
| CN101550016B (en) * | 2009-04-28 | 2011-08-03 | 莱芜钢铁集团有限公司 | Magnesia chrome carbon coating and preparation method thereof |
| CN105481401A (en) * | 2015-12-30 | 2016-04-13 | 宜兴市集创新材料科技有限公司 | Zirconite refractory brick |
| CN108526388B (en) * | 2018-05-30 | 2019-11-08 | 四川廷勋铸造材料有限公司 | A kind of cast paint and preparation method thereof for flow coat |
-
1990
- 1990-09-26 CN CN 90105890 patent/CN1021305C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069563C (en) * | 1998-12-21 | 2001-08-15 | 冶金工业部洛阳耐火材料研究院 | Magnesium tundish paint for conticasting steel |
| WO2020169771A1 (en) * | 2019-02-20 | 2020-08-27 | Intocast Ag | Cold-setting dry vibratable mix |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1060302A (en) | 1992-04-15 |
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