CN1234880C - Composite desulfurizing agent for iron and steel and its preparing process - Google Patents
Composite desulfurizing agent for iron and steel and its preparing process Download PDFInfo
- Publication number
- CN1234880C CN1234880C CN 03112433 CN03112433A CN1234880C CN 1234880 C CN1234880 C CN 1234880C CN 03112433 CN03112433 CN 03112433 CN 03112433 A CN03112433 A CN 03112433A CN 1234880 C CN1234880 C CN 1234880C
- Authority
- CN
- China
- Prior art keywords
- calcium
- calcium oxide
- calcium carbide
- desulfurizing agent
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The present invention discloses a composite desulfurizing agent for steel, which is composed of 20 to 75% of calcium oxide, 5 to 20% of calcium fluoride, 10 to 60% of calcium carbide and 3 to 10% of barium carbonate, wherein the calcium oxide and the calcium carbide carry out passivation treatment. Compared with the calcium carbide desulfurizing agent, the preparing cost of the composite desulfurizing agent reduces 20 to 60%. Meanwhile, because the barium carbonate is introduced, the stability of sulfide in desulphurizing slag is obviously increased, and a resulfurization phenomenon is effectively prevented. The present invention has the advantages of obvious desulfurizing reaction speed increase and good desulfurizing effect, and can be widely used for desulfurizing and refining molten steel and molten iron in smelting industry.
Description
The invention relates to a composition for molten iron and molten steel desulphurization and a manufacturing method thereof, in particular to a composition suitable for external desulphurization of molten iron in an electric furnace and a cupola furnace and a manufacturing method thereof.
Chinese patent CN1158359 published in the background art proposes a "desulfurizing agent for smelting cast iron", which is prepared by using industrial limestone as a base material and then adding dolomite, fluorite, industrial soda, industrial silicon carbide and a binder. The proposal solves the problem that lime is easy to absorb moisture to a certain extent, but the reaction speed is slow, and the temperature of the heat absorption molten iron is increased. CN1061438 discloses a cast iron and cast steel refining agent composed of raw materials such as calcium carbide, fluorite, sodium chloride, cryolite and the like, and the main defect of the refining agent is high cost. The fine granular molten iron desulfurizing agent and the molten pig iron desulfurizing method of patent No. 8510442.7 use a composition consisting of calcium carbide, a hydrogen releasing compound and magnesium. As is known, the metal magnesium is easy to oxidize and explode in storage and transportation, the absorptivity is low during desulfurization, the harsh magnesium light influences the operation, the price of the magnesium is very high and is about ten times that of calcium carbide, and the use of the magnesium inevitably causes the defect of overhigh manufacturing cost of finished products.
In addition, a large amount of calcium carbonate, magnesium carbonate and sodium carbonate are adopted in the scheme, and the components are easy to decompose to generate carbon dioxide, so that the method is an endothermic process, reduces the temperature of molten steel (iron) and is not beneficial to improving the reaction speed.
The calcium oxide is a raw material for manufacturing the smelting desulfurizer, which has a certain desulfurization effect and is low in cost, but the calcium oxide has poor desulfurization effect when being used alone, and has the defects of easy moisture absorption and denaturation in long-distance transportation and the like, so that the satisfactory desulfurization effect is not easily achieved in application.
Chinese patent publication CN1317585 "composite desulfurizer for steel and iron and manufacturing method thereof" provides a technical solution to the above problems, which integrates the advantages of calcium oxide \ calcium carbide and calcium fluoride, and plays an obvious role in increasing the desulfurization reaction speed and improving the desulfurization effect. From practice, the technical scheme still has the following problems that the desulfurized slag is easy to return to molten iron (molten steel) after desulfurization, and the desulfurization effect is influenced.
The invention aims to overcome the defects in the same industry during material selection, provides a composite desulfurizer composition for steel and iron, which takes calcium oxide as a main raw material, is matched with effective components for preventing resulfurization of desulfurized slag, and provides a process method for pretreating the raw material. The technical scheme of the invention can greatly reduce the manufacturing cost and improve the quality of the molten steel (iron) and the production economic benefit of the casting on the premise of ensuring the desulfurization effect and the quality of the casting.
The object of the invention can be achieved by the following measures: a composite desulfurizer for steel comprises the following components (by weight percent): 20-75% of calcium oxide, 5-20% of calcium fluoride, 10-60% of calcium carbide and 3-10% of barium carbonate.
The object of the invention is also achieved by the following measures: a composite desulfurizer for steel comprises the following components (by weight percent): 30-70% of calcium oxide, 5-20% of calcium fluoride, 20-55% of calcium carbide and 3-10% of barium carbonate. Wherein the selection of barium carbonate and the amount thereof is the key of the invention.
The object of the invention is also achieved by the following measures: a composite desulfurizing agent for iron and steel is prepared through passivating calcium oxide and calcium carbide, respectively or simultaneously coating a layer of moisture-proof film on the surfaces of calcium oxide and calcium carbide, and proportionally mixing with other components.
The invention has the following characteristics: (1) the calcium oxide is used as the main raw material, and the manufacturing cost is reduced by 20-60% compared with the calcium carbide desulfurizer; (2) the barium carbonate is introduced, so that the stability of sulfide in the desulfurization slag is obviously improved, and the resulfurization phenomenon is effectively prevented; (3) the calcium oxide and the calcium carbide are subjected to moisture-proof passivation treatment, so that the service performance and the safety performance of the calcium oxide and the calcium carbide are ensured; (4) the desulfurization reaction speed is obviously improved, and the desulfurization effect is excellent. The invention is further illustrated below with reference to the reaction mechanism and examples.
The chemical reaction formula is as follows:
CaC2the Ca produced has the functions of desulfurization and deoxidation. The calcium fluoride and the barium carbonate have the function of reducing the melting points of calcium oxide and calcium carbide and can accelerate the reaction speed.
Detailed Description
Example one
The contents of the components (weight percentage) are as follows: 75% of calcium oxide, 15% of calcium carbide, 5% of calcium fluoride and 5% of barium carbonate.
Firstly, passivating a certain amount of calcium oxide, namely, respectively or simultaneously, uniformly hanging a layer of moisture-proof film on the surface of the calcium oxide in a special mixing and stirring device, and then uniformly mixing the calcium oxide with other components according to a proportion.
Example two
The contents of the components (weight percentage) are as follows: 45% of calcium oxide, 5% of calcium fluoride, 40% of calcium carbide and 10% of barium carbonate.
Firstly, passivating certain amount of calcium oxide and calcium carbide, namely, respectively or simultaneously hanging a layer of moisture-proof film on the surfaces of the calcium oxide and the calcium carbide in a special mixing and stirring device, and then uniformly mixing the calcium oxide and the calcium carbide with other components according to a proportion.
EXAMPLE III
The contents of the components (weight percentage) are as follows: 20% of calcium oxide, 20% of calcium fluoride, 55% of calcium carbide and 5% of barium carbonate. Firstly, passivating certain amount of calcium oxide and calcium carbide, namely, respectively or simultaneously hanging a layer of moisture-proof film on the surfaces of the calcium oxide and the calcium carbide in a special mixing and stirring device, and then uniformly mixing the calcium oxide and the calcium carbide with other components according to a proportion.
Example four
The contents of the components (weight percentage) are as follows: 49% of calcium oxide, 10% of calcium fluoride, 35% of calcium carbide and 6% of barium carbonate.
Firstly, passivating certain amount of calcium oxide and calcium carbide, namely, respectively or simultaneously hanging a layer of moisture-proof film on the surfaces of the calcium oxide and the calcium carbide in a special mixing and stirring device, and then uniformly mixing the calcium oxide and the calcium carbide with other components according to a proportion.
Claims (3)
1. A composite desulfurizer for steel is characterized in that: it consists of the following components: 20-75% of calcium oxide, 5-20% of calcium fluoride, 10-60% of calcium carbide and 3-10% of barium carbonate;
the percentages are weight percentages.
2. The desulfurizing agent according to claim 1, wherein: 30-70% of calcium oxide, 5-20% of calcium fluoride, 20-55% of calcium carbide and 3-10% of barium carbonate.
3. The method for producing a desulfurizing agent according to claim 1 or 2, wherein: passivating calcium oxide and calcium carbide, namely respectively or simultaneously hanging a layer of moisture-proof film on the surfaces of the calcium oxide and the calcium carbide in a mixing and stirring device, and then uniformly mixing the moisture-proof film with other components according to a proportion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03112433 CN1234880C (en) | 2003-06-20 | 2003-06-20 | Composite desulfurizing agent for iron and steel and its preparing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03112433 CN1234880C (en) | 2003-06-20 | 2003-06-20 | Composite desulfurizing agent for iron and steel and its preparing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1566373A CN1566373A (en) | 2005-01-19 |
| CN1234880C true CN1234880C (en) | 2006-01-04 |
Family
ID=34468919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03112433 Expired - Fee Related CN1234880C (en) | 2003-06-20 | 2003-06-20 | Composite desulfurizing agent for iron and steel and its preparing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1234880C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436604C (en) * | 2006-02-27 | 2008-11-26 | 沈阳东北大学冶金技术研究所 | Passivated composite desulfurizing powder and preparing method |
| CN101724734B (en) * | 2008-11-03 | 2011-03-30 | 湖北省通山县通力镁业有限责任公司 | Complex desulfurizer and manufacturing method |
| CN101649367B (en) * | 2009-09-10 | 2011-01-05 | 武汉钢铁(集团)公司 | Technology for mixed blowing and desulfuration of iron mixing vehicle |
-
2003
- 2003-06-20 CN CN 03112433 patent/CN1234880C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1566373A (en) | 2005-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1202269C (en) | Desulfurizer and its producing technique | |
| CN101392309B (en) | Slag conglomeration agent for hot metal pretreatment of magnesium injection and deep desulphurization and use method thereof | |
| CN1461680A (en) | Tundish covering agent for pure steel, and its making method | |
| CN111590039A (en) | Continuous casting covering slag for low-carbon high-aluminum steel and preparation method thereof | |
| CN1317585A (en) | Composite desulfurizing agent for iron and steel and its preparing process | |
| CN1730674A (en) | Method for moten iron desulfurization using slag of desulfurized molten iron | |
| CN1234880C (en) | Composite desulfurizing agent for iron and steel and its preparing process | |
| CN1528919A (en) | Method for desulfurizing melton iron using desulfurizing agent of containing-aluminium calcium-oxide group | |
| CN1308101C (en) | Covering agent for pouring basket in high alkalinity | |
| CA2829030C (en) | Agent for treating molten metals, method for the production and use thereof | |
| CN1676621A (en) | Suboxide steel production method | |
| CN1338525A (en) | Deeply desulfurizing slag for steel ladle as refining furnace | |
| CN1377977A (en) | Synthetic slag for reducing oxygen and sulfur content in molten steel and its slag making method | |
| CN1129672C (en) | Core-covered wire for deep-desulfurization for steel production | |
| CN102787209A (en) | Method for producing ultralow-sulfur steel under high vacuum | |
| CN1154748C (en) | Compound iron melt desulfurizing agent | |
| CN111363888A (en) | KR desulfurizer as well as preparation method and application thereof | |
| CN107177718B (en) | Novel low-carbon low-silicon steel refining slag | |
| CN1546691A (en) | Highly effective molten steel and iron liquid desulfurization method utilizing nanometer technology | |
| CN1884591A (en) | Outer desulfurization method for acid induction furnace | |
| KR100226901B1 (en) | Desulphurization agent of molten metal | |
| CN1320130C (en) | Liquid steel out furnace refiner | |
| CN115418441B (en) | Efficient denitrification agent and denitrification method for converter tapping process | |
| CN85104955A (en) | Process for desulphurising melten metal | |
| KR20000006843A (en) | method of steel manufacture slag modifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060104 Termination date: 20120620 |