CN1477213A - Compound desulfurizing agent for molten iron - Google Patents
Compound desulfurizing agent for molten iron Download PDFInfo
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- CN1477213A CN1477213A CNA031280986A CN03128098A CN1477213A CN 1477213 A CN1477213 A CN 1477213A CN A031280986 A CNA031280986 A CN A031280986A CN 03128098 A CN03128098 A CN 03128098A CN 1477213 A CN1477213 A CN 1477213A
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- molten iron
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- lime powder
- desulfurizing agent
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Abstract
The composition of composite desulfurizing agent for smelting iron is formed from (by weight portion) 50-80 portions of calcium carbide powder and 20-50 portions of lime powder, in which the summation of both them is 100 portions, and the gas-producing quantity of calcium carbide powder is greater than or equal to 300 L/kg, and the calcium oxide percentage content in the lime powder is greater than or equal to 90%, sulfur percentage content is less than or equal to 0.025% and silicone dioxide percentage content is less than or equal to 1%. The desulfurizing effect of desulfurizing agent can be approaching to that of normal calcium carbide desulfurizing agent.
Description
Technical Field
The invention belongs to a desulfurizer, and particularly relates to a molten iron composite desulfurizer.
Technical Field
The traditional molten iron desulfurizing agents have three types: one is active lime powder (CaO), and the second is calcium carbide powder (CaC)2) And the third is passivated magnesium powder. The three desulfurizing agents have single component and have respective advantages and disadvantages. The active lime powder (CaO) has lower desulfurization capability, but has low price, safe use and easy operation, and is a feasible desulfurizer for common steel; calcium carbide powder (CaC)2) The desulfurizing agent has strong desulfurizing capacity, can meet the deep desulfurizing requirement of steel, but can easily absorb moisture to generate explosive gas acetylene (C)2H2) Potential safety hazards exist in the process of storing and using the desulfurizer, and the desulfurization capacity is reduced after moisture absorption, so that the desulfurization cost is high; although the passivated magnesium powder can meet the desulfurization requirements of various high-quality varieties of steel, the price is high and is greatly limited, and only a few varieties of steel with special requirements are adopted.
Disclosure of Invention
The invention aims to provide a composite desulfurizer for molten iron, which combines the advantages of the above desulfurizers and overcomes the disadvantages of the above single desulfurizer.
The molten iron composite desulfurizer of the invention mainly comprises the following raw materials in parts by weight: 50-80 parts of calcium carbide powder; 20-50 parts of lime powder, wherein the sum of the lime powder and the lime powder is 100 parts, the gas forming amount of the calcium carbide powder is more than or equal to 300L/kg, the percentage content of calcium oxide in the lime powder is more than or equal to 90%, the percentage content of sulfur in the lime powder is less than or equal to 0.025%, and the percentage content of silicon dioxide in the lime powder is less than or equal to 1%.
In order to improve the fluidity of the desulfurizer, 1-2 parts by weight of graphite powder can be added and mixed.
The invention combines active lime powder (CaO) andcalcium carbide powder (CaC)2) The reaction characteristics of the desulfurizing agent are as follows:
mechanism of CaO desulfurizer: since the refractoriness of CaO is as high as 2570 ℃, CaO cannot be decomposed at the temperature of molten iron, and is difficult to react with elemental sulfur in the molten iron, but only with oxides of sulfur dissociated in the molten iron, and the reaction is as follows:
the products of the above reactions all turn into slag and precipitate, and since the combination reaction is an exothermic reaction, the temperature of molten iron does not decrease.
When carbon atoms exist, CaO can react with elemental sulfur under the action of C because the carbon has extremely high reducibility, and the reaction is carried out in two steps:
the first step is as follows: the second step is that:
however, since CaO in the desulfurizing agent is in contact with graphite in a free state in molten iron, it is difficult to achieve the desulfurizing effect.
CaC2The desulfurization mechanism is as follows: from valence Structure CaC2Belongs to an unstable structure, therefore, the Ca and the C elements are easily decomposed under the action of the temperature of molten iron, and the decomposed Ca can be in the same desulfurization effect with Mg powderAnd even more preferably. The reaction is as follows:
the decomposed C can react as follows:
as can be seen from the above reaction, the oxides of C and sulfur again react to precipitate elemental sulfur, which is further consumed by the CaC2Ca and C are decomposed. Due to CaC2The atomic ratio of Ca to C in the solution is 1: 2, which inevitably increases the CaC greatly2The unit consumption of desulfurization of the desulfurizing agent.
Through the analysis, the composite desulfurizer takes CaO with low cost and long service life, removes sulfur in oxides of sulfur in molten iron, and removes CaC with excellent monomer sulfur removal effect2Is used on the blade, thereby realizing the aim of achieving pure CaC2The desulfurization effect of the desulfurizer can also reduce the CaC2For the purpose of consumption, greatly improving CaC2Safety performance of the desulfurizing agent.
Detailed Description
The raw material requirements are as follows: the lime powder contains more than or equal to 90 percent of calcium oxide, less than or equal to 0.025 percent of sulfur, less than or equal to 1 percent of silicon dioxide and more than or equal to 360 milliliters of activity; gas forming amount of calcium carbide powder is more than or equal to 300L/kg
Example 1 comprises the following components in proportion: lime powder 52 kg and calcium carbide powder 48 kg
Example 2 comprises the following components in percentage by weight: 27 kg of calcium carbide powder 73 kg
Example 3 comprises the following components in percentage by weight: 50 kilograms of lime powder and 50 kilograms of calcium carbide powder and 1 kilogram to 2 kilograms of graphite powder
In the above embodiment, the raw materials can be mixed in proportion and then crushed until the particle size is less than or equal to 1.0 mm. When the device is used for static molten iron desulphurization, a blowing device is required to be adopted, and the blowing speed is mediumIn CaC2About 50kg/min between the desulfurizer and the CaO desulfurizer.
Loading the test material in carbide bin, spraying test composite desulfurizer in torpedo tank by top-blown insertion method to desulfurize molten iron, the test condition is basically the same as normal molten iron desulfurization condition, and the test result is the same as CaC2The desulfurization agent pairs are as follows:
| desulfurization of Agent for treating cancer | Value taking | Molten iron Measurement of | Molten iron Front temperature Degree C. | Molten iron Rear temperature Degree C. | Molten iron Front sulfur 10-5 | Molten iron Post sulfur 10-5 | Single pot Throw in Amount kg | Blowing speed Degree of rotation kg/min | Unit consumption 1 kg/t.s | Unit consumption 2 kg/t.s One is Sulfur |
| Test of Material sink Total number of According to | MAX | 294 | 1389 | 1368 | 44 | 13 | 1600 | 50 | 7.263 | 0.329 |
| MIN | 167 | 1331 | 1307 | 21 | 3 | 500 | 25 | 1.808 | 0.095 | |
| Mean value of | 239.5 | 1372 | 1351 | 31 | 7.1 | 1129 | 40 | 4.716 | 0.196 | |
| Test of Material is just Constant speed Time of rotation Data of | MAX | 271 | 1389 | 1368 | 36 | 12 | 1400 | 50 | 7.263 | 0.284 |
| MIN | 179 | 1347 | 1326 | 22 | 3 | 800 | 45 | 3.327 | 0.151 | |
| Mean value of | 226 | 1374 | 1354 | 30 | 6 | 1122 | 46 | 5.058 | 0.212 | |
| Is normal Calcium carbide Desulfurization of Agent for treating cancer | MAX | 287 | 1425 | 1392 | 50 | 9 | 1600 | 50 | 7.388 | 0.388 |
| MIN | 185.5 | 1334 | 1305 | 12 | 3 | 400 | 36.4 | 1.766 | 0.134 | |
| Mean value of | 234 | 1379 | 1358 | 25.8 | 3.9 | 1111 | 45.1 | 4.752 | 0.217 |
From the above table, it can be seen that: the desulfurization effect of the desulfurizer is close to that of a normal calcium carbide desulfurizer, and the unit consumption 2 is lower than that of the normal calcium carbide desulfurizer. The cost of the desulfurizer of the invention is much lower than that of calcium carbide desulfurizer.
Claims (4)
1. The composite desulfurizer for molten iron is characterized by mainly comprising the following raw materials in parts by weight: 50-80 parts of calcium carbide powder; 20-50 parts of lime powder, wherein the sum of the lime powder and the lime powder is 100 parts, the gas forming amount of the calcium carbide powder is more than or equal to 300L/kg, the percentage content of calcium oxide in the lime powder is more than or equal to 90%, the percentage content of sulfur in the lime powder is less than or equal to 0.025%, and the percentage content of silicon dioxide in the lime powder is less than or equal to 1%.
2. The composite desulfurizer for molten iron according to claim 1, wherein the raw material further comprises 1 to 2 parts by weight of graphite powder.
3. The composite desulfurizing agent for molten iron according to claim 1, wherein the processing particle size of the raw material is not more than 1.0 mm.
4. The molten iron composite desulfurizer as claimed in claim 1, wherein the activity of the lime powder is not less than 360 ml.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031280986A CN1477213A (en) | 2003-06-05 | 2003-06-05 | Compound desulfurizing agent for molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031280986A CN1477213A (en) | 2003-06-05 | 2003-06-05 | Compound desulfurizing agent for molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1477213A true CN1477213A (en) | 2004-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031280986A Pending CN1477213A (en) | 2003-06-05 | 2003-06-05 | Compound desulfurizing agent for molten iron |
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| CN (1) | CN1477213A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332041C (en) * | 2005-10-05 | 2007-08-15 | 鞍山科技大学 | Water-repellancy high-alkalinity steel-making out-furnace refining slag production method |
| CN100393892C (en) * | 2005-12-08 | 2008-06-11 | 中国铝业股份有限公司 | Desulfur technology of phosphorus molten pig iron for precalcining anode pouring |
| CN102268505A (en) * | 2011-08-04 | 2011-12-07 | 沈阳东北大学冶金技术研究所有限公司 | Method for pre-desulfuration of molten iron in foundry ladle |
-
2003
- 2003-06-05 CN CNA031280986A patent/CN1477213A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332041C (en) * | 2005-10-05 | 2007-08-15 | 鞍山科技大学 | Water-repellancy high-alkalinity steel-making out-furnace refining slag production method |
| CN100393892C (en) * | 2005-12-08 | 2008-06-11 | 中国铝业股份有限公司 | Desulfur technology of phosphorus molten pig iron for precalcining anode pouring |
| CN102268505A (en) * | 2011-08-04 | 2011-12-07 | 沈阳东北大学冶金技术研究所有限公司 | Method for pre-desulfuration of molten iron in foundry ladle |
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