CN104087713A - Processing technique of low-nitrogen low-hydrogen carburizing agent - Google Patents
Processing technique of low-nitrogen low-hydrogen carburizing agent Download PDFInfo
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- CN104087713A CN104087713A CN201410292654.6A CN201410292654A CN104087713A CN 104087713 A CN104087713 A CN 104087713A CN 201410292654 A CN201410292654 A CN 201410292654A CN 104087713 A CN104087713 A CN 104087713A
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Abstract
The invention relates to a carburizing agent, particularly a processing technique of a low-nitrogen low-hydrogen carburizing agent, which aims to solve the problem that the existing carburizing agent with high nitrogen and hydrogen contents influences the quality of the manufactured steel. The technique comprises the following steps: uniformly mixing 17-23% of petroleum coke, 32-38% of purified graphite, 27-33% of half graphite, 12-16% of free carbon and 0.5-1.5% of asphalt, granulating, carrying out surface modification and heat treatment, screening, classifying and packaging. On the premise of satisfying the components and properties of the carburizing agent, the cost is lower; the carburizing agent is denitrified and dehydrogenated, thereby effectively lowering the hazard on the steel properties due to the impurities introduced by the carburizing agent, and greatly increasing the carbon absorptivity of the molten steel; and the carburizing agent is classified according to the granularity, thereby avoiding the severe environmental protection problem due to high tendency to flying and combustion, and avoiding the problems of low recovery rate and low stability.
Description
Technical field
The present invention relates to a kind of carburelant, relate in particular to a kind of complete processing of low nitrogen low hydrogen carburelant.
Background technology
Refinery coke is as current conventional carburelant, although cost is low, its proportion is little, after input ladle, can not penetrate, and has the defect of carburetting poor effect; In addition, when current carburelant is introduced carbon again, introduced the elements such as sulphur, phosphorus, nitrogen, hydrogen larger on the impact of molten steel, sulphur and phosphorus can react by air blowing to be removed, once and nitrogen and protium enter molten steel is difficult to remove; Nitrogen and hydrogen contained in carburelant not only can reduce the mechanical property of steel, are also the major reasons that forms shrinkage cavity, white-spot defects and strand crackle, bring very large difficulty to the high-quality steel of preparation.
Summary of the invention
The invention provides a kind of low nitrogen low hydrogen carburelant, be intended to solve existing carburelant nitrogen and hydrogen richness high, thus the problem of the steel quality that impact produces.
In order to solve above technical problem, the present invention is achieved through the following technical solutions:
A complete processing for low nitrogen low hydrogen carburelant, comprises following processing step:
A, according to mass percent, 17%～23% refinery coke, 32%～38% purification of graphite, 27%～33% schungite, 12%～16% free carbon, 0.5%～1.5% pitch are mixed;
B, granulation: the compound through steps A is carried out to rotary table granulation;
C, surface modification: will in step B, cause the carburelant of grain in cylinder, to rotate 3～4 hours; The surface modification of carburelant can increase carburelant and penetrate and invade profit ability in molten steel;
D, thermal treatment: the carburelant through step C surface modification is placed 1～2 hour at 80～120 ℃ and pressure in temperature under the condition of-0.05～-0.1MPa; Be conducive to remove nitrogen and hydrogen in carburelant; The content of nitrogen and hydrogen in reduction carburelant, the carburelant that adopts this step process to cross adds in molten steel, has increased the quality of steel.
E, screening: the carburelant after step D is processed sieves on demand on vibratory screening apparatus; Carburelant is sieved according to granularity, be conducive to need to select varigrained carburelant according to different, to reach better effect;
F, the carburelant sieving is carried out to class wrapping according to granularity.
Further, in steps A, according to mass percent, comprise 20% refinery coke, 35% purification of graphite, 30% schungite, 14% free carbon, 1% pitch; Cost and performance are all relatively good.
Further, in steps A, according to mass percent, comprise 23% refinery coke, 32% purification of graphite, 31% schungite, 13% free carbon, 1% pitch; Most economical mass ratio.
Further, in steps A, according to mass percent, comprise 18% refinery coke, 36% purification of graphite, 31% schungite, 14% free carbon, 1% pitch; The mass ratio of performance the best.
Further, the granularity of described pitch is below 600 orders; Be conducive to strengthen the bond effect of pitch, and put the excessive of particle only.
Further, in step C, carburelant rotates 3.5 hours in cylinder; Granulation best results.
Further, in step D, carburelant is placed 1.5 hours under the condition of 100 ℃ of temperature and pressure-0.075MPa; The effect of removing nitrogen and hydrogen is best.
Compared with prior art advantage of the present invention is: the present invention selects refinery coke, purification of graphite, schungite, free carbon, the compound carburelant of preparing of pitch, is meeting under the condition of carburelant composition and performance, and product cost is further reduced; Under condition of negative pressure, carburelant is carried out to denitrogenation dehydrogenation processing, effectively reduce harm steel performance being caused by impurity that carburelant is introduced, greatly increased the specific absorption of molten steel to carbon; According to granularity, carburelant is classified, match with working conditions, both avoided carburelant because of particle too little, easily under the condition of high temperature, contact with air oxidation loss occurs, easily fly upward, burn and cause very serious environmental issue, avoid again carburelant granularity can not be absorbed by molten steel too greatly, caused the low and unsettled problem of the rate of recovery.
Embodiment
A complete processing for low nitrogen low hydrogen carburelant, comprises following processing step:
A, according to mass percent, 20% refinery coke, 35% purification of graphite, 30% schungite, 14% free carbon, the pitch of 1% granularity below 600 orders are mixed;
B, granulation: the compound through steps A is carried out to rotary table granulation;
C, surface modification: will in step B, cause the carburelant of grain in cylinder, to rotate 3.5 hours;
D, thermal treatment: the carburelant through step C surface modification is placed 1.5 hours under the condition at-0.075MPa at 100 ℃ and pressure in temperature;
E, screening: the carburelant after step D is processed sieves on demand on vibratory screening apparatus;
F, the carburelant sieving is carried out to class wrapping according to granularity.
By screening, carburelant is sieved at 0～1mm, 1～4mm, 4～10mm according to size range; Schungite is semi-graphited carbon.
The present invention selects refinery coke, purification of graphite, schungite, free carbon, the compound carburelant of preparing of pitch, is meeting under the condition of carburelant composition and performance, and product cost is further reduced; Under condition of negative pressure, carburelant is carried out to denitrogenation dehydrogenation processing, effectively reduce harm steel performance being caused by impurity that carburelant is introduced, greatly increased the specific absorption of molten steel to carbon; According to granularity, carburelant is classified, match with working conditions, both avoided carburelant because of particle too little, easily under the condition of high temperature, contact with air oxidation loss occurs, easily fly upward, burn and cause very serious environmental issue, avoid again carburelant granularity can not be absorbed by molten steel too greatly, caused the low and unsettled problem of the rate of recovery.
The foregoing is only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this, any those skilled in the art is in the field of the invention, and the variation of doing or modification are all encompassed among the scope of the claims of the present invention.
Claims (7)
1. a complete processing for low nitrogen low hydrogen carburelant, is characterized in that: comprise following processing step:
A, according to mass percent, 17%～23% refinery coke, 32%～38% purification of graphite, 27%～33% schungite, 12%～16% free carbon, 0.5%～1.5% pitch are mixed;
B, granulation: the compound through steps A is carried out to rotary table granulation;
C, surface modification: will in step B, cause the carburelant of grain in cylinder, to rotate 3～4 hours;
D, thermal treatment: the carburelant through step C surface modification is placed 1～2 hour at 80～120 ℃ and pressure in temperature under the condition of-0.05～-0.1MPa;
E, screening: the carburelant after step D is processed sieves on demand on vibratory screening apparatus;
F, the carburelant sieving is carried out to class wrapping according to granularity.
2. a kind of low nitrogen low hydrogen carburelant complete processing according to claim 1, is characterized in that: in steps A, according to mass percent, comprise 20% refinery coke, 35% purification of graphite, 30% schungite, 14% free carbon, 1% pitch.
3. a kind of low nitrogen low hydrogen carburelant complete processing according to claim 1, is characterized in that: in steps A, according to mass percent, comprise 23% refinery coke, 32% purification of graphite, 31% schungite, 13% free carbon, 1% pitch.
4. a kind of low nitrogen low hydrogen carburelant complete processing according to claim 1, is characterized in that: in steps A, according to mass percent, comprise 18% refinery coke, 36% purification of graphite, 31% schungite, 14% free carbon, 1% pitch.
5. a kind of low nitrogen low hydrogen carburelant complete processing according to claim 1, is characterized in that: the granularity of described pitch is below 600 orders.
6. a kind of low nitrogen low hydrogen carburelant complete processing according to claim 1, is characterized in that: in step C, carburelant rotates 3.5 hours in cylinder.
7. a kind of low nitrogen low hydrogen carburelant complete processing according to claim 1, is characterized in that: in step D, carburelant is placed 1.5 hours under the condition of 100 ℃ of temperature and pressure-0.075MPa.
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| CN201410292654.6A CN104087713B (en) | 2014-06-26 | 2014-06-26 | A kind of complete processing of low nitrogen low hydrogen carburelant |
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| CN201410292654.6A CN104087713B (en) | 2014-06-26 | 2014-06-26 | A kind of complete processing of low nitrogen low hydrogen carburelant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222360A (en) * | 2016-08-24 | 2016-12-14 | 钱华 | A kind of refining furnace steel-making low nitrogen hypoxia carburetting ball and preparation method thereof |
| CN107326145A (en) * | 2017-07-05 | 2017-11-07 | 天长市兴宇铸造有限公司 | A kind of alloy Investment Steel Castings casting carburant and its preparation technology |
| CN109652612A (en) * | 2019-01-16 | 2019-04-19 | 连云港博威冶金材料有限公司 | A kind of carburant and preparation method thereof |
| CN110804686A (en) * | 2019-11-28 | 2020-02-18 | 丹晟实业（上海）有限公司 | Processing technology of low-nitrogen carburant |
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| CN1035852A (en) * | 1988-03-18 | 1989-09-27 | 中南工业大学 | Production of high-voltage high specific capacitance tantalum powder by means of carbon reduction |
| CN1523122A (en) * | 2003-09-04 | 2004-08-25 | 吴光亮 | Carburant for steel-making and producing process and method of using thereof |
| CN1786206A (en) * | 2005-10-18 | 2006-06-14 | 赵聚法 | Petrol coke graphitization prepared carburant and petrol coke graphitization furnace filling technology |
| CN102703637A (en) * | 2012-06-13 | 2012-10-03 | 南阳铭鑫斯迪奥科技有限公司 | Low-nitrogen recarbonizer |
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2014
- 2014-06-26 CN CN201410292654.6A patent/CN104087713B/en active Active
Patent Citations (4)
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| CN1035852A (en) * | 1988-03-18 | 1989-09-27 | 中南工业大学 | Production of high-voltage high specific capacitance tantalum powder by means of carbon reduction |
| CN1523122A (en) * | 2003-09-04 | 2004-08-25 | 吴光亮 | Carburant for steel-making and producing process and method of using thereof |
| CN1786206A (en) * | 2005-10-18 | 2006-06-14 | 赵聚法 | Petrol coke graphitization prepared carburant and petrol coke graphitization furnace filling technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106222360A (en) * | 2016-08-24 | 2016-12-14 | 钱华 | A kind of refining furnace steel-making low nitrogen hypoxia carburetting ball and preparation method thereof |
| CN107326145A (en) * | 2017-07-05 | 2017-11-07 | 天长市兴宇铸造有限公司 | A kind of alloy Investment Steel Castings casting carburant and its preparation technology |
| CN109652612A (en) * | 2019-01-16 | 2019-04-19 | 连云港博威冶金材料有限公司 | A kind of carburant and preparation method thereof |
| CN110804686A (en) * | 2019-11-28 | 2020-02-18 | 丹晟实业（上海）有限公司 | Processing technology of low-nitrogen carburant |
| CN110804686B (en) * | 2019-11-28 | 2021-09-17 | 丹晟实业（上海）有限公司 | Processing technology of low-nitrogen carburant |
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| CN104087713B (en) | 2016-02-10 |
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Address after: 313100 new industrial park, pheasant City, Huzhou, Zhejiang, Changxing County Patentee after: Zhejiang Jincheng new material Limited by Share Ltd Address before: 313100, Huzhou, Changxing County, Zhejiang province pheasant Town Industrial Zone Zhejiang Jincheng refractory materials Co., Ltd. Patentee before: Zhejiang Jincheng Refractories Co., Ltd. |