CN102001854B - Special steel ladle draining sand for stainless steel and production process thereof - Google Patents
Special steel ladle draining sand for stainless steel and production process thereof Download PDFInfo
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- CN102001854B CN102001854B CN 201010571546 CN201010571546A CN102001854B CN 102001854 B CN102001854 B CN 102001854B CN 201010571546 CN201010571546 CN 201010571546 CN 201010571546 A CN201010571546 A CN 201010571546A CN 102001854 B CN102001854 B CN 102001854B
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Abstract
The invention discloses a special steel ladle draining sand for stainless steel and a production process thereof. The product and the process can effectively improve the self-opening rate of a steel ladle, greatly relieve the labor intensity of workers, reduce oxygen-blast draining times, improve the quality of molten steel and ensure the progressive execution of a continuous casting process. When the stainless steel is produced by using the steel ladle draining sand, the self-opening rate of the steel ladle can reach above 98% so that the purposes of fewer oxygen-blast draining times, high quality of molten steel and progressive execution of the continuous casting process are achieved, and simultaneously, the total steel-making cost of a steel mill is also reduced.
Description
Technical field
The invention belongs to Metal smelting auxiliary material technical field, particularly the special-purpose ladle draining sand of a kind of stainless steel and production technique thereof.
Technical background
At present, the iron and steel enterprise of domestic smelting stainless steel is more limited, although it is a lot of to produce the producer of stuffing sand, the ladle draining sand that can develop for type of stainless steel characteristics and smelting characteristic thereof is few to few.Especially can according to the characteristics of stainless steel and smelting thereof, design the producer of special stuffing sand and distinctive production technique thereof especially seldom.The rust steel that most of producer provides is only to change a little on the basis of general drainage sand with ladle draining sand, use stuffing sand though be designated stainless steel series, but still exist the ladle self-opening rate low, the problem such as burn that oxygen is excessive, continuous casting breaks and water.Under this present situation, iron and steel enterprise is when smelting stainless steel, and the ladle self-opening rate is not high, burning oxygen excessively, even causes the problems such as continuous casting interruption because the stuffing sand that is not exclusively used in the stainless steel design causes, and has brought huge financial loss to enterprise.Outstanding problem according to current existence, higher for the Stainless Steel Alloy constituent content, even surpass 50% characteristics more than 10%, develop the special-purpose ladle draining sand of a kind of stainless steel and design a kind of specific production process route, thereby reaching the purpose that improves the ladle self-opening rate.
Summary of the invention
The object of the present invention is to provide the special-purpose ladle draining sand of a kind of stainless steel and production technique thereof, this product and technique can effectively improve the ladle self-opening rate, greatly alleviate labor strength, reduce oxygen blast drainage number of times, improve steel quality and guarantee the continuous casting process direct motion.When stainless steel is produced, can reach more than 98% by using this product ladle self-opening rate, oxygen blast drainage number of times is few, steel quality is high, the purpose of continuous casting process direct motion thereby reach, and has also reduced the overall steel-making cost of steel mill simultaneously.
The special-purpose ladle draining sand of a kind of stainless steel is comprised of the material of following weight percent: chromium sand 60～76%, the wherein Cr in chromium sand
2O
3The quality percentage composition be 42～48%; Sea sand (0.5～1.0 ㎜) 10～20%, Al ball 4～9%, interior frosting 4～9%, potassium felspar sand 3～5%, carbon black 0.3～0.8%, middle carbon 0.3～1.0%.
Further, the special-purpose ladle draining sand of a kind of stainless steel is made of chromium sand 68%, the wherein Cr in chromium sand the material of following weight percent
2O
3The quality percentage composition be 42～48%; Sea sand (0.5～1.0 ㎜) 15%, Al ball 6%, interior frosting 6%, potassium felspar sand 4%, carbon black 0.5%, middle carbon 0.5%.
The preparation technology of the special-purpose ladle draining sand of above-mentioned stainless steel comprises the following steps,
A. various qualified starting material chromium sand, extra large sand, Al ball, interior frosting, potassium felspar sand, carbon black, middle carbon are sized to the grade of regulation, then various starting material are measured in described ratio, the various starting material that measure are placed on the position of appointment;
B. first 4 kinds of materials of extra large sand, Al ball, interior frosting, potassium felspar sand of accurate measurement are all poured in bucket carries, in often do ratio that the above-mentioned compound of 600kg adds 2～5kg water with water be poured on these 4 kinds of materials above;
C. at water, a suitable hole is dug in few place, then the carbon black that measures, middle carbon are poured in the hole, avoid carbon black, middle carbon loss, the compound in bucket is carried is carried in stirrer and is only stirred 10～15min;
D. then the chromium sand that measures is carried by bucket and also carried remix stirring 3～5min in stirrer;
E. the hotblast stove furnace temperature is risen to 550 ℃, starting struggles against to carry carries the material that stirs into drying tower, and the vacuum fan of drying tower side starts simultaneously, the dust that produces is extracted out, prevent that the stuffing sand dust is large, dried finished product is packed warehouse-in with the sand temperature drop from drying tower bottom outflow to suitable temp.
Find after deliberation will guarantee ladle from opening, stuffing sand must possess following performance: natural fluidity is good, sintered layer is moderate, anti-molten steel penetrating power is strong, thermal expansivity is little etc.After the ladle nozzle slide plate was opened, ferrostatic pressure can break through rapidly sintered layer, reaches the purpose of nature drainage like this.Mainly test from following several respects when designing the stainless steel stuffing sand for this:
The starting material grain grade proportion.The shared ratio of starting material granular size and size fractionated has a significant impact the sintered layer thickness of stuffing sand, and fine particle fraction is large, and sintered layer is blocked up; Otherwise the coarse particles ratio is large, and sintered layer is thinner, fills eakiness.So raw-material grain grade proportion is wanted rationally, the ratio below 80 orders is smaller, accounts for 5～15%, 20～80 orders and accounts for 60～80%, accounts for 8～20% more than 20 orders.Tap density is good like this, good fluidity, and sintered layer is suitable, and the self-opening rate of stuffing sand is high.
Fusing assistant adds.In order to control better sintered layer thickness, expansion character, add potassium felspar sand, reduce the fusing point of stuffing sand, more be conducive to form fast sintered layer, prevent that molten steel from infiltrating.
Lubricant adds.In order to make stuffing sand water Shi Gengyi from opening opening, carbon black and middle carbon class carbonaceous material lubricant have been introduced.
On production technique.Production technique has a direct impact raw-material mixing uniformity, and drainage rate that every kind of raw-material addition sequence is different, add that the water yield is improper, churning time is improper etc. all can cause the finished product to use the time is high.Find through our repetition test: should first add other outer different materials of dechromisation sand when adding starting material, and then add chromia material; Amount of water is that every 600kg stuffing sand amount of water is the most suitable when 2.5kg; Churning time first stirs 10min for other material, stirs 4min after adding chromium sand again, and the finished product Color that stirs out like this is good, more even, and when more being conducive to use, large bag is from opening.
Through the analysis of front, in conjunction with the stainless steel characteristics, determine stainless steel main physical and chemical index such as the following table of stuffing sand: Cr
2O
325 ~ 36%, SiO
215～25%, MgO 5～10%, Al
2O
35～10%, H
2O≤0.5%, particle diameter 0.5～3.0 ㎜, angle of repose 25～30 degree, the sintering situation is good.
Trial target of the present invention is chosen in the steel mills such as green hill Jin Hui, connection is many, southwest is stainless and tests, at first test in green hill Jin Hui steel mill, through on probation, the ladle self-opening rate reaches more than 98%, sometimes even reach 100%, workman's labour intensity alleviates greatly, has avoided simultaneously causing due to drainage the phenomenon of Molten Steel Cleanliness variation, improved steel quality, made the continuous casting process direct motion more of steel mill.The present invention has taked technique scheme, and compared with prior art, the present invention has that the ladle self-opening rate is high, oxygen blast drainage number of times is few, labour intensity is little, steel quality is high and guarantee the continuous casting process direct motion, reduces the low advantage of the overall steel-making cost of steel mill.
Embodiment
Embodiment one:
The special-purpose ladle draining sand of a kind of stainless steel is comprised of the material of following weight percent: chromium sand (more than the 0.21mm particle diameter〉70%) 64%, the wherein Cr in chromium sand
2O
3The quality percentage composition be 42～48%; Sea sand (0.5～1.0 ㎜) 19%, Al ball 5%, interior frosting 8%, potassium felspar sand 3%, carbon black 0.4%, middle carbon 0.6%.
Various qualified starting material chromium sand, extra large sand, Al ball, interior frosting, potassium felspar sand, carbon black, middle carbon are sized to the grade of regulation, then various starting material are measured in described ratio, the various starting material that measure are placed on the position of appointment.First 4 kinds of materials of extra large sand, Al ball, interior frosting, potassium felspar sand of accurate measurement are all poured into the bucket carry in, in often do ratio that the above-mentioned compound of 600kg adds 2～5kg water with water be poured on these 4 kinds of materials above, at water, a suitable hole is dug in few place, then the carbon black that measures, middle carbon are poured in the hole, the material in bucket is carried proposes the clean 10～15min of stirring in stirrer.Then the chromium sand that measures is carried by bucket and also carried the unified 3～5min that stirs again in stirrer.The hotblast stove furnace temperature is risen to 550 ℃, and starting struggles against to carry carries the material that stirs into drying tower, and the vacuum fan of drying tower side starts simultaneously, and the dust that produces is extracted out, prevents that the stuffing sand dust is large.Dried finished product is packed warehouse-in with the sand temperature drop from drying tower bottom outflow to suitable temp.Cr in wherein said chromium sand
2O
3Percentage composition must be higher than 42～48%.
All on sale on described starting material Al ball, interior frosting, potassium felspar sand, carbon black, middle carbon market, namely chromium sand can be chosen from Dalian match dimension, and extra large sand is purchased from river, Tianjin sand industry.
Embodiment two
The special-purpose ladle draining sand of a kind of stainless steel is comprised of the material of following weight percent: chromium sand (more than the 0.21mm particle diameter〉70%) 72%, the wherein Cr in chromium sand
2O
3The quality percentage composition be 42～48%; Sea sand (0.5～1.0 ㎜) 13%, Al ball 4%, interior frosting 5%, potassium felspar sand 5%, carbon black 0.6%, middle carbon 0.4%.
The production technique that the present invention takes such as embodiment one.
Embodiment three:
The special-purpose ladle draining sand of a kind of stainless steel is comprised of the material of following weight percent: chromium sand (more than the 0.21mm particle diameter〉70%) 68%, the wherein Cr in chromium sand
2O
3The quality percentage composition be 42～48%; Sea sand (0.5～1.0 ㎜) 15%, Al ball 6%, interior frosting 6%, potassium felspar sand 4%, carbon black 0.5%, middle carbon 0.5%.
The production technique that the present invention takes such as embodiment one.
Claims (1)
1. the special-purpose ladle draining sand of stainless steel, is characterized in that, it is comprised of the material of following weight percent: chromium sand 60～76%, the wherein Cr in chromium sand
2O
3The quality percentage composition be 42～48%; Sea sand 10～20%, Al ball 4～9%, interior frosting 4～9%, potassium felspar sand 3～5%, carbon black 0.3～0.8%, middle carbon 0.3～1.0%; The production technique of the special-purpose ladle draining sand of described stainless steel comprises the steps:
A. various qualified starting material chromium sand, extra large sand, Al ball, interior frosting, potassium felspar sand, carbon black, middle carbon are sized to the grade of regulation, then various starting material are measured in described ratio, the various starting material that measure are placed on the position of appointment;
B. first 4 kinds of materials of extra large sand, Al ball, interior frosting, potassium felspar sand of accurate measurement are all poured in bucket carries, in often do ratio that the above-mentioned compound of 600kg adds 2～5kg water with water be poured on these 4 kinds of materials above;
C. at water, a suitable hole is dug in few place, then the carbon black that measures, middle carbon are poured in the hole, avoid carbon black, middle carbon loss, the compound in bucket is carried is carried in stirrer and is only stirred 10～15min;
D. then the chromium sand that measures is carried by bucket and also carried remix stirring 3～5min in stirrer;
E. the hotblast stove furnace temperature is risen to 550 ℃, starting struggles against to carry carries the material that stirs into drying tower, and the vacuum fan of drying tower side starts simultaneously, the dust that produces is extracted out, prevent that the stuffing sand dust is large, dried finished product is packed warehouse-in with the sand temperature drop from drying tower bottom outflow to suitable temp.
2. special-purpose ladle draining sand of stainless steel as claimed in claim 1, it is characterized in that: it is comprised of the material of following weight percent, chromium sand 68%, the wherein Cr in chromium sand
2O
3The quality percentage composition be 42～48%; Sea sand 15%, Al ball 6%, interior frosting 6%, potassium felspar sand 4%, carbon black 0.5%, middle carbon 0.5%.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103537661B (en) * | 2013-10-12 | 2016-03-02 | 南阳汉冶特钢有限公司 | A kind of chromium matter stuffing sand and production technology thereof improving ladle self-opening rate |
| CN103708842B (en) * | 2013-12-12 | 2016-03-02 | 南阳铭鑫斯迪奥科技有限公司 | A kind of chromium magnesium zirconium matter stuffing sand and preparation method thereof |
| CN104557090B (en) * | 2015-01-12 | 2016-04-06 | 河南通宇冶材集团有限公司 | A kind of production technique of steel ladle drainage agent |
| CN109702179A (en) * | 2019-01-24 | 2019-05-03 | 邯郸钢铁集团有限责任公司 | A kind of process control method improving ladle self-opening rate |
| CN110407588A (en) * | 2019-06-21 | 2019-11-05 | 杨晓军 | A kind of preparation method coating far infrared glaze layer stuffing sand |
| CN110496959B (en) * | 2019-09-20 | 2021-03-19 | 乌兰察布市西蒙鼎新技术开发有限公司 | Drainage sand and preparation method thereof |
| CN112479728B (en) * | 2020-12-23 | 2022-10-18 | 河南通宇冶材集团有限公司 | Chromium-free environment-friendly fluxing agent for drainage agent, drainage agent and preparation method |
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| CN1994624A (en) * | 2006-12-20 | 2007-07-11 | 西峡县通宇冶金保护材料有限公司 | Novel prescription of CSP diversion agent and preparation method thereof |
| CN101185968A (en) * | 2007-12-11 | 2008-05-28 | 河南通宇冶材集团有限公司 | Drainage agent for refining in three phases and preparation method thereof |
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| CN1994624A (en) * | 2006-12-20 | 2007-07-11 | 西峡县通宇冶金保护材料有限公司 | Novel prescription of CSP diversion agent and preparation method thereof |
| CN101185968A (en) * | 2007-12-11 | 2008-05-28 | 河南通宇冶材集团有限公司 | Drainage agent for refining in three phases and preparation method thereof |
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