CN104195280A - Composite desulfurizer and molten iron desulphurization method employing composite desulfurizer - Google Patents
Composite desulfurizer and molten iron desulphurization method employing composite desulfurizer Download PDFInfo
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- CN104195280A CN104195280A CN201410469718.5A CN201410469718A CN104195280A CN 104195280 A CN104195280 A CN 104195280A CN 201410469718 A CN201410469718 A CN 201410469718A CN 104195280 A CN104195280 A CN 104195280A
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Abstract
The invention provides a composite desulfurizer and a molten iron desulphurization method employing the composite desulfurizer. The composite desulfurizer is prepared by mixing the following components in parts by weight: 12-19 parts of passive metal magnesium, 75-83 parts of high-magnesium lime and 2-10 parts of sodium salt, wherein the total weight parts is 100. The molten iron desulphurization method comprises the following steps: controlling the temperature of the molten iron to be 1250-1390 DEG C, and spraying 4.15-6.35 kg of the composite desulfurizer into each ton of the molten iron. The composite desulfurizer has the beneficial effects that the cost is lowered and the desulphurization effect is improved.
Description
Technical field
The present invention relates to Desulphurization of Pig Iron field, specifically, relate to a kind of low cost, high efficiency composite desulfurizing agent, and a kind of molten iron desulfurizing method that uses this composite desulfurizing agent.
Background technology
Desulfurizing iron is developed so far existing tens kinds of methods both at home and abroad, have trough to catch the method for spreading, ladle-to-ladle method, mechanical mixing method, air blowing paddling process, powder injection process etc., the most frequently used several Desulphuring Process of Molten Irons mainly contain KR method, singly blow granular magnesium technique, Mg-base desulfurizing agent composite blowing technique, mix powder injection process now.
The kind of sweetening agent is a lot, and in desulfurizing iron pre-treatment, conventional sweetening agent has calcium fimily desulfurizing agent, sodium fimily desulfurizing agent, magnesium based desulphurizer.
But there is the deficiency that cost is high and/or desulfuration efficiency is not high in sweetening agent of the prior art.
Summary of the invention
The object of the invention is to solve at least one in prior art above shortcomings.
For example, the object of the present invention is to provide the molten iron composite desulfurizing agent that a kind of low cost and sweetening effectiveness are good.
To achieve these goals, one aspect of the present invention provides a kind of composite desulfurizing agent.Described composite desulfurizing agent is mixed by the passive metal magnesium of 12～19 parts, the high magnesium lime of 75～83 parts and the sodium salt of 2～10 parts by weight, and total weight parts is 100 parts.
Another object of the present invention is to provide a kind of molten iron desulfurizing method that can reduce desulphurization cost and improve sweetening effectiveness.
To achieve these goals, another aspect of the present invention provides a kind of molten iron desulfurizing method.Described molten iron desulfurizing method control molten iron temperature is 1250～1390 DEG C, and to the composite desulfurizing agent 4.15～6.35kg/t iron of winding-up as described in any one in claim 1 to 5 in molten iron.
Compared with prior art, composite desulfurizing agent of the present invention and use the beneficial effect of the molten iron desulfurizing method of this composite desulfurizing agent to comprise: can reduce desulphurization cost, and can improve sweetening effectiveness.
Embodiment
Hereinafter, describe composite desulfurizing agent of the present invention in detail in connection with exemplary embodiment and use the molten iron desulfurizing method of this composite desulfurizing agent.
In one exemplary embodiment of the present invention, composite desulfurizing agent can be mixed by the passive metal magnesium of 12～19 parts, the high magnesium lime of 75～83 parts and the sodium salt of 2～10 parts by weight, and total weight parts is 100 parts.Preferably, composite desulfurizing agent can be made up of the passive metal magnesium of 14～17 parts, the high magnesium lime of 77～81 parts and the sodium salt of 5～8 parts.
Temperature is in the time of 1350 DEG C, and magnesium has gaseous state, and now the sweetening power of magnesium steam is very strong, and after molecular balance, sulphur content is about 1.6 × 10
-5.According to thermodynamic argument, the value of △ G is less, will more easily carry out to positive reaction direction, and therefore the sweetening agent of magnesium also can be accomplished high desulfurization efficiency at lower temperature.
The reaction of carrying out desulfurizing iron with magnesium comprises following step:
(l) MAGNESIUM METAL after passivation is entering fusing in molten iron, vaporization and dissolution process;
(2) bubble of the sulphur dissolving in molten iron and magnesium steam reacts at contact surface place;
(3) there is reaction uniformly in the MAGNESIUM METAL after MAGNESIUM METAL dissolving and sulphur, generates MgS;
(4) MgS particle forms and laggardly enters to be excluded in slag.
Contriver finds: as the carrier reacting in molten iron, can more give full play to the desulfidation of MAGNESIUM METAL with high magnesium lime pulvis.And with respect to adopting quickened lime as for the carrier of magnesium desulfurizer, the desulphurization reaction carrier using high magnesium lime as magnesium desulfurizer can reduce costs greatly, in high magnesium lime pulvis, CaO, MgO also can play the effect of desulfurization simultaneously; But desulfurization product is dystectic sulfurated lime, magnesium sulfide, CaO, MgO that it can suppress high magnesium lime granule interior in the existence on high magnesium lime surface continue to participate in desulphurization reaction.Therefore, contriver is to be mixed by the passive metal magnesium of 12～19 parts, the high magnesium lime of 75～83 parts and the sodium salt of 2～10 parts by the Composition Control of composite desulfurizing agent.Here, allocate the sodium salt of 2～10 parts into, can make by the low-melting feature of sodium salt the compound of sulfurated lime, magnesium sulfide and sodium salt formation low melting point, improve the reacting dynamics condition of high magnesium lime, to improve the utilization ratio of high magnesium lime; Meanwhile, sodium salt (for example, Na
2cO
3) there is very strong sweetening power, can significantly improve desulfuration efficiency.
Be described as follows about the effect reducing costs: the conventional price of high magnesium lime material that composite desulfurizing agent of the present invention adopts can be 300 yuan/t left and right; But the price of quickened lime is generally 600 yuan/t left and right, obviously, method of the present invention can reduce sweetening agent cost greatly.For example, high magnesium lime can be the product of rhombspar after high-temperature calcination.The composition of high magnesium lime can be CaO:40～60%, MgO:30～50%, CaCO
3: 5～10% and MgCO
3: 5～10%, certainly, also can contain a small amount of impurity.
In the present invention, MAGNESIUM METAL in passive metal magnesium (TMg) content >=90%, all the other are MgO.Sodium salt can be sodium carbonate, Na in sodium carbonate
2cO
3content is preferably>=and 98%, all the other are SiO
2.In passive metal magnesium particle diameter < 1mm account for more than 80% and particle diameter < 2mm account for 100%.In high magnesium lime particle diameter < 1mm account for more than 80% and particle diameter < 2mm account for 100%.In sodium salt particle diameter < 1mm account for more than 80% and particle diameter < 2mm account for 100%.
In another exemplary embodiment of the present invention, molten iron desulfurizing method control molten iron temperature is 1250～1390 DEG C, and to the composite desulfurizing agent 4.15～6.35kg/t iron as above of jetting in molten iron.Here, the composition of molten iron can comprise 3.5%～4.8% C, 0.03%～0.15% S, 0.1%～1.0% Si, 0.1%～1.0% Mn, 0.05%～0.4% V by weight percentage, and the iron of surplus and impurity that on a small quantity can not be unavoidably.
Winding-up composite desulfurizing agent mode can be mixed injection method (being first premix) or composite blowing method (that is, two cover winding-up blanking devices mix in pipeline, and wherein sodium salt is with addition of in high magnesium lime).
In order to understand better the present invention, to further illustrate the present invention below in conjunction with concrete example and comparative example.
example 1
In this example, in composite desulfurizing agent, passive metal magnesium accounts for 14wt%, and high magnesium lime accounts for 78wt%, and sodium salt accounts for 8wt%.Passive metal magnesium TMg content is 92wt%, and all the other are MgO.The composition of high magnesium lime is: CaO:50wt%, MgO:40wt%, CaCO
3: 5wt%, MgCO
3: 5wt%.
Certain factory's 140t hot metal ladle adopts the composite desulfurizing agent of this example to carry out desulfurizing iron, and molten iron main component is C:4.5% by mass percentage, S:0.07%, Si:0.3%, Mn:0.4%, and V:0.3%, remaining is TFe, temperature is 1300 DEG C.Adopt composite blowing method to carry out desulfurization, to the composite desulfurizing agent 5.2kg/t molten iron of jetting in molten iron, wherein, the consumption of passive metal magnesium is 0.73kg/t molten iron, and the consumption of high magnesium lime is 4.1kg/t molten iron, and the consumption of sodium salt is 0.42kg/t molten iron.Through blowing desulfurization, the sulphur content in molten iron is down to 0.012%, has reached steel grade requirement.
comparative example
Certain factory's 140t hot metal ladle adopts the compound sweetening agent of passive metal magnesium+quickened lime of this example to carry out desulfurizing iron.Passive metal magnesium TMg content is 92wt%, and all the other are MgO.Molten iron main component is C:4.5% by mass percentage, S:0.07%, Si:0.3%, Mn:0.4%, and V:0.3%, remaining is TFe, temperature is 1300 DEG C.Adopt composite blowing method to carry out desulfurization, to the sweetening agent 4.9kg/t molten iron of the passive metal magnesium+quickened lime of jetting in molten iron, wherein, the consumption of passive metal magnesium is 0.8kg/t molten iron, and the consumption of high magnesium lime is 4.1kg/t molten iron.Through blowing desulfurization, the sulphur content in molten iron is down to 0.025%.Obviously, the sweetening effectiveness of comparative example is starkly lower than example 1 of the present invention.
example 2
In this example, in composite desulfurizing agent, passive metal magnesium accounts for 12wt%, and high magnesium lime accounts for 83wt%, and sodium salt accounts for 5wt%.Passive metal magnesium TMg content is 95wt%, and all the other are MgO.The composition of high magnesium lime is: CaO:40wt%, MgO:50wt%, CaCO
3: 5wt%, MgCO
3: 5wt%
Certain factory's 140t hot metal ladle adopts the composite desulfurizing agent of this example to carry out desulfurizing iron, and molten iron main component is C:4.0% by mass percentage, S:0.05%, Si:0.35%, Mn:0.3%, and V:0.32%, remaining is TFe, temperature is 1320 DEG C.Adopt composite blowing method to carry out desulfurization, to the composite desulfurizing agent 5.4kg/t molten iron of jetting in molten iron.Through blowing desulfurization, the sulphur content in molten iron is down to 0.010%, has reached steel grade requirement.
example 3
In this example, in composite desulfurizing agent, passive metal magnesium accounts for 18wt%, and high magnesium lime accounts for 76wt%, and sodium salt accounts for 6wt%.Passive metal magnesium TMg content is 95wt%, and all the other are MgO.The composition of high magnesium lime is: CaO:40wt%, MgO:50wt%, CaCO
3: 5wt%, MgCO
3: 5wt%.
Certain factory's 140t hot metal ladle adopts the composite desulfurizing agent of this example to carry out desulfurizing iron, and molten iron main component is C:4.0% by mass percentage, S:0.05%, Si:0.35%, Mn:0.3%, and V:0.32%, remaining is TFe, temperature is 1320 DEG C.Adopt composite blowing method to carry out desulfurization, to the composite desulfurizing agent 5.25kg/t molten iron of jetting in molten iron.Through blowing desulfurization, the sulphur content in molten iron is down to 0.020%, has reached steel grade requirement.
In sum, composite desulfurizing agent of the present invention and use the molten iron desulfurizing method of this composite desulfurizing agent reducing in desulphurization cost, to improve sweetening effectiveness, has good economic benefit and promotion prospect widely.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skill in the art should be clear, in the case of not departing from the spirit and scope of claim, can carry out various amendments to above-described embodiment.
Claims (6)
1. a composite desulfurizing agent, is characterized in that, described composite desulfurizing agent is mixed by the passive metal magnesium of 12～19 parts, the high magnesium lime of 75～83 parts and the sodium salt of 2～10 parts by weight, and total weight parts is 100 parts.
2. composite desulfurizing agent according to claim 1, is characterized in that, described composite desulfurizing agent is made up of the passive metal magnesium of 14～17 parts, the high magnesium lime of 77～81 parts and the sodium salt of 5～8 parts.
3. composite desulfurizing agent according to claim 1, is characterized in that, in described passive metal magnesium particle diameter < 1mm account for more than 80% and particle diameter < 2mm account for 100%; In described high magnesium lime particle diameter < 1mm account for more than 80% and particle diameter < 2mm account for 100%; In described sodium salt particle diameter < 1mm account for more than 80% and particle diameter < 2mm account for 100%.
4. composite desulfurizing agent according to claim 1, is characterized in that, the composition of described passive metal magnesium contains the TMg that is not less than 90% and the MgO that is not more than 10% by weight percentage.
5. composite desulfurizing agent according to claim 1, is characterized in that, the composition of described high magnesium lime comprises by weight percentage: 40%～60% CaO, 30%～50% MgO, 5%～10% CaCO
3, and 5%～10% MgCO
3.
6. a molten iron desulfurizing method, is characterized in that, described molten iron desulfurizing method comprises step: controlling molten iron temperature is 1250～1390 DEG C, and to the composite desulfurizing agent 4.15～6.35kg/t iron of winding-up as described in any one in claim 1 to 5 in molten iron.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358265A (en) * | 2008-07-05 | 2009-02-04 | 攀枝花市东攀工贸有限责任公司 | Compound iron melt desulfurizing agent and method of preparing the same |
| CN103627850A (en) * | 2013-11-27 | 2014-03-12 | 攀钢集团研究院有限公司 | Desulphurization slag modifier for molten iron containing vanadium and titanium, preparation method of desulphurization slag modifier and desulphurization slag modifying method |
| CN104032093A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten iron desulfurizing agent and molten iron desulfurization method |
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- 2014-09-16 CN CN201410469718.5A patent/CN104195280A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358265A (en) * | 2008-07-05 | 2009-02-04 | 攀枝花市东攀工贸有限责任公司 | Compound iron melt desulfurizing agent and method of preparing the same |
| CN103627850A (en) * | 2013-11-27 | 2014-03-12 | 攀钢集团研究院有限公司 | Desulphurization slag modifier for molten iron containing vanadium and titanium, preparation method of desulphurization slag modifier and desulphurization slag modifying method |
| CN104032093A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten iron desulfurizing agent and molten iron desulfurization method |
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Application publication date: 20141210 |
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