CN101638718A - High burst temperature carbonic pellet - Google Patents
High burst temperature carbonic pellet Download PDFInfo
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- CN101638718A CN101638718A CN200810041088A CN200810041088A CN101638718A CN 101638718 A CN101638718 A CN 101638718A CN 200810041088 A CN200810041088 A CN 200810041088A CN 200810041088 A CN200810041088 A CN 200810041088A CN 101638718 A CN101638718 A CN 101638718A
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Abstract
The invention relates to a high burst temperature carbonic pellet. The dry basis of the pellet comprises the following components in percentage by mass: 0.5 to 1.0 percent of sodium humate, 1 to 3 percent of lime hydrate, 10 to 25 percent of carbonic raw material, and the balance of iron-containing oxide dust, wherein a wet pellet contains 9 to 11 percent of moisture. The particles of which the particle size is less than 10 mum in the carbonic raw material accounts for 90 percent or above. The high burst temperature carbonic pellet adopts a bonding agent which has low cost and wide source, does not reduce the grade of the metallized pellet after reduction, and can effectively improve the disc-pelletizing carbonic green pellet dynamic burst temperature; the parameters of the pelletizing moisture adaptive with the binding agent, the component particle size and the like are determined to ensure that the binding agent at least does not reduce the strength of a carbonic green pellet while improving the burst temperature effect of the pellet. Besides, by improving the burst temperature of the carbonic pellet in the prior art, the high temperature waste gas can be used directly to achievethe effects of environment protection and energy conservation.
Description
Technical field
The present invention relates to the used Steel Plant's oxides-containing iron of horizontal moving bed reducing process and join carbon-containing green-ball manufacture technology field, particularly a kind of carbonaceous pelletizing of high burst temperature.
Background technology
To make carbonaceous pelletizing behind powdered iron ore or the Steel Plant's dust adding carbonaceous material, after the drying, at high temperature through horizontal moving bed reducing process (as rotary hearth furnace process, straight-bottom furnace technology etc.), it directly is reduced into the iron-containing charge of certain degree of metalization and the metallic reducings such as zinc in pelletizing volatilizations is collected, respectively the former is used for the ironmaking or the steel-making of Steel Plant, the raw material that the latter is used for the production of zinc product is the important method of non-blast furnace ironmaking and Steel Plant's dust comprehensive utilization.In this method, the rate of drying that improves the carbonaceous pelletizing green-ball is the important step that increases whole process efficiency.
Improving the most effective means of carbonaceous pelletizing rate of drying is that it is heated under the high temperature dynamic air current, the dynamic air current temperature is high more, the pelletizing rate of drying is fast more, but heterogeneity (comprise and added different binding agents), different processing mode (as pressure ball or rolling balling), the green pellets of heterogeneity, the degree of its tolerance dynamic air current temperature has difference, shows:
Under identical water content, identical dynamic air current temperature and speed, the composition that has or the pelletizing of structure can crack or explosion, the quantity of the pelletizing of the composition that has or structure explosion is few, not even explosion, crack or the pelletizing of explosion frangible, not only can't further carry out normal high temperature reduction, also can worsen the high temperature reduction process of normal ball material, must be avoided or eliminate.
Prior art is weighed the difference degree of green pellets tolerance dynamic air current temperature with dynamic burst temperature or this measurement index of dynamic fracture temperature, measured dynamic burst temperature or dynamic fracture temperature are high more, the temperature that this kind pelletizing tolerance dynamic air current is described is high more, even drying can not produce explosion yet under higher dynamic air current temperature, therefore, can obtain high rate of drying and efficient.
In the prior art, the method that is used for the carbonaceous pelletizing making has pressure ball, disk spin and cylinder spin, the selection of balling-up method is relevant with follow-up green-ball reducing process or sinter process, The present invention be directed to match with horizontal moving bed reducing process the improvement done of carbonaceous pelletizing disk spin method.
In general, no matter adopt pressure ball, disk spin and cylinder spin to make ball, adding binding agent all may exert an influence to the burst temperature of carbonaceous pelletizing, the binding agent that can adopt in the prior art (CN200610018299.9 is disclosed as Chinese patent) has wilkinite, lime, cement, water glass, borate, clay, coal tar, petroleum slag, flyash, spent pulping liquor, syrup, marine plant, humic acids, various starch, water glass, pendant benefit, polyacrylamide etc.But retrieval shows, uses disk spin method and produce used then rarely seen wilkinite of binding agent and the Semen Maydis powder tackiness agent of carbonaceous pelletizing on horizontal moving bed reducing process, sees PCT/JP2001/009523.
The bentonitic typical chemical constitution of table 1 (wt/%):
| ????Tfe | ????SiO 2 | ????CaO | ????MgO | ????Al 2O 3 | ????Na 2O | ????K 2O | ????Ig |
| ????1.51 | ????63.21 | ????0.99 | ????2.90 | ????14.96 | ????1.79 | ????0.38 | ????13.62 |
By table 1 as seen, its main component is SiO
2, belong to acidic substance, make the shortcoming of using as binding agent in the ball at carbonaceous pelletizing unit dish and be: it is stayed in the reducting pellet as impurity, has increased the impurity level of reduction back metallized pellet, has reduced the grade of product, for following process has increased burden.The problem of Semen Maydis powder tackiness agent is that price is more expensive, has increased cost.Make ball and manufacture carbonaceous pelletizing though other tackiness agent can be used for unit dish in principle, how its add-on and adding method just can make it more competitive than prior art then is unknown.
In addition, moisture and heterogeneity granularity are also all influential to the burst temperature of carbonaceous pelletizing, as PCT/JP2001/009523 when making tackiness agent with wilkinite and Semen Maydis powder, selected suitable moisture is 8-13%, and the raw material particle size that comprises dust and carbon containing powder is required to be particle diameter powder 20-80% that 10 μ m are following.Because moisture and component particle size not only have considerable influence to burst temperature, ultimate compression strength and dropping strength to green-ball also has considerable influence simultaneously, and green ball strength all has a significant impact for the assurance that green-ball transports efficient and high temperature reduction reductibility, therefore, introducing new binding agent, when managing to improve burst temperature, preferably can keep and improve the ultimate compression strength and the dropping strength of green-ball, at least be the intensity that does not reduce green-ball, this just make with the supporting moisture of new binding agent and raw material granularity to the influence of burst temperature and ultimate compression strength also within consideration of the present invention.
The burst temperature of prior art carbonaceous pelletizing is only near 200 ℃, its value is on the low side, both do not satisfied the requirement of the drying efficiency of ball, simultaneously, because the equal superelevation of spent air temperture that can be used as oven dry can not directly use in 200 ℃, have to the waste gas processing of lowering the temperature, reduced process efficiency, improved the technology cost, therefore, the necessity that also changes.
Summary of the invention
The object of the present invention is to provide a kind of carbonaceous pelletizing of high burst temperature, the introducing cost is low, the source extensively, does not reduce reduction back metallized pellet grade and can effectively improve the binding agent that disk is made ball carbon containing green-ball dynamic fracture temperature; Determine to make ball moisture with new binding agent adapts, parameters such as component particle size are to guarantee that new binding agent when improving pelletizing burst temperature effect, does not reduce the intensity of carbon containing green-ball at least.In addition,, the waste gas of comparatively high temps can directly be used, realize environmental protection and energy-saving effect by improving carbonaceous pelletizing burst temperature in the prior art.
For achieving the above object, technical scheme of the present invention is,
A kind of carbonaceous pelletizing of high burst temperature, its butt composition quality per-cent is: Sodium salts humic acids 0.5～1.0%; Slaked lime 1～3%, carbon raw material 10-25%, all the other butt compositions are the dust of oxides-containing iron; Wet bulb group's water content is 9-11%.
Further, in the described carbon raw material granularity the particle below the 10 μ m account for 90% or more than.
The dust of described oxides-containing iron and carbon raw material are blast furnace gas mud and/or coal ash.
Beneficial effect of the present invention
The burst temperature of carbon containing green pellets of the present invention is significantly improved.When adopting Sodium salts humic acids, slaked lime composition binding agent, burst temperature has improved 210 ℃.
After the measure by regulating and controlling carbonaceous material granularity, burst temperature has improved 100 ℃ again, and promptly burst temperature has improved 310 ℃.The suitable water content of carbon containing green pellets also slightly reduces, and has reduced water consumption.
Moreover, after adopting the measure of adjusting carbonaceous material granularity of the present invention, the ultimate compression strength of carbon containing green pellets and dropping strength also have more significantly raising, and the wet bulb compression strength value has improved the 5.8-6.1N/ ball, and the dry bulb compression strength value has improved the 4.4-5.1N/ ball.The wet bulb dropping strength has improved 3.5 times/ball.The dry bulb dropping strength has improved 3.5 times/ball.
Sodium salts humic acids, slaked lime are formed the binding agent cost and are descended, and the lime composition that increases enters ironmaking after to the pelletizing reduction or steel-making all can play useful flux effect.
Obtaining of above-mentioned beneficial effect can be analyzed as follows from mechanism: 1.Ca (OH)
2Can with the Sodium salts humic acids reacting generating complex, in addition, Ca (OH)
2Middle calcium ion can make Sodium salts humic acids polymer generation cohesion, changes netted colloid into by thread-like molecule, and these two kinds of effects have significantly reduced the binding agent hydrophilic radical, and the effect that improves pellet strength and burst temperature is arranged simultaneously.Test shows: these act on, and role and effect have very big-difference under different pelletizing processing modes and the different add-on, dish is made under the ball condition in unit, when the Sodium salts humic acids add-on less than 1% the time, raising to burst temperature has remarkable effect, and when its add-on greater than 1% the time, not obvious to the raising effect of burst temperature.2. test shows, dish is made under the ball condition in unit, and the granularity below the carbon contg particle 10 μ m is to the granularity of pellet strength role greater than other kind particle, and is when the ratio of the following particle of 10 μ m improves, remarkable to the raising effect of green pellet strength.
Embodiment
The present invention will be further described below by embodiment.
Embodiment 1
The wet bulb granularity is 12-13mm; Blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 83.5% (wt); Smokeless coal ash (butt, 10 μ m following 90%), 15% (wt); Sodium salts humic acids (butt, weight) 0.5%, slaked lime (butt, weight) 1%.
In the compound, the following particle ratio of 10 μ m accounts for 67.8%.; The following coal ash particle ratio of 10 μ m accounts for 13.5%: water content is 9%.
The green-ball performance is: burst temperature: 430 ℃; Wet bulb ultimate compression strength 17.1N/ ball, dry bulb compression strength value 29.1N/ ball.12.1 times/ball of wet bulb dropping strength; 5.9 times/ball of dry bulb dropping strength.
Embodiment 2
The wet bulb granularity is 12-13mm; Blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 82.5% (wt); Smokeless coal ash (butt, 10 μ m following 90%), 15% (wt); Sodium salts humic acids (butt, weight) 1.0%, slaked lime (butt, weight) 1.5%.
In the compound, the following particle ratio of 10 μ m accounts for 67.1%; The following coal ash particle ratio of 10 μ m accounts for 13.5%, and water content is 9%.
The green-ball performance is: burst temperature, 470 ℃; Wet bulb ultimate compression strength 16.9N/ ball, dry bulb ultimate compression strength 28.8N/ ball.12.1 times/ball of wet bulb dropping strength; 5.3 times/ball of dry bulb dropping strength.
Embodiment 3
Wet variole degree is 12-13mm; Blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 81% (wt); Smokeless coal ash (butt, 10 μ m following 90%): 15% (wt); Sodium salts humic acids (butt, weight) 1.0%, slaked lime (butt, weight) 3%.
In the compound, the following particle ratio of 10 μ m accounts for 66.2%.; The following coal ash particle ratio of 10 μ m accounts for 13.5%, and water content is 9%.
The green-ball performance is: burst temperature, 510 ℃; Wet bulb ultimate compression strength 16.6N/ ball, dry bulb ultimate compression strength 28.7N/ ball.11.9 times/ball of wet bulb dropping strength; 5.1 times/ball of dry bulb dropping strength.
Embodiment 4
The wet bulb granularity is 12-13mm; Blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 73.5% (wt); Smokeless coal ash (butt, 10 μ m following 90%), 25% (wt); Sodium salts humic acids (butt, weight) 0.5%, slaked lime (butt, weight) 1%.
In the compound, the following particle ratio of 10 μ m accounts for 70.3%.; The following coal ash particle ratio of 10 μ m accounts for 22.5%: water content is 9.2%.
The green-ball performance is: burst temperature: 405 ℃; Wet bulb ultimate compression strength 15.2N/ ball, dry bulb ultimate compression strength 25.2N/ ball.10.1 times/ball of wet bulb dropping strength; 4 times/ball of dry bulb dropping strength.
Embodiment 5
The wet bulb granularity is 12-13mm; Blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 72.5% (wt); Smokeless coal ash (butt, 10 μ m following 90%), 25% (wt); Sodium salts humic acids (butt, weight) 1.0%, slaked lime (butt, weight) 1.5%.
In the compound, the following particle ratio of 10 μ m accounts for 69.6%; The following coal ash particle ratio of 10 μ m accounts for 22.5%, and water content is 9.2%.
The green-ball performance is: burst temperature, 43 5 ℃; Wet bulb ultimate compression strength 15.6N/ ball, dry bulb ultimate compression strength 24.8N/ ball.9.8 times/ball of wet bulb dropping strength; 4.2 times/ball of dry bulb dropping strength.
Embodiment 6
Wet variole degree is 12-13mm; Blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 71% (wt); Smokeless coal ash (butt, 10 μ m following 90%): 25% (wt); Sodium salts humic acids (butt, weight) 1.0%, slaked lime (butt, weight) 3%.
In the compound, the following particle ratio of 10 μ m accounts for 68.7%.; The following coal ash particle ratio of 10 μ m accounts for 22.5%, and water content is 9.2%.
The green-ball performance is: burst temperature, 455 ℃; Wet bulb ultimate compression strength 14.5N/ ball, dry bulb ultimate compression strength 25.4N/ ball.11.1 times/ball of wet bulb dropping strength; 4.4 times/ball of dry bulb dropping strength.
Comparative Examples
The wet bulb granularity is 12-13mm; Used material composition (butt): blast furnace gas mud (containing full iron 49%), smokeless coal ash proportioning are: blast furnace gas mud (contain the following particle of full iron 49%, 10 μ m and account for 65%, butt) 85% (wt); Smokeless coal ash (butt, 10 μ m following 90%), 15% (wt);
In the compound, the following particle ratio of 10 μ m accounts for the following coal ash particle ratio of 68.75%, 10 μ m and accounts for 13.5%, and water content is 9%.
The green-ball performance is: burst temperature, and 300 ℃, wet bulb ultimate compression strength 16.9N/ ball, the dry bulb compression strength value is the 29.4N/ ball.12.2 times/ball of wet bulb dropping strength.6.3 times/ball of dry bulb dropping strength.
And under same raw material and proportioning, when the particle ratio below the 10 μ m in the coal ash only accounted for 40%, the following coal ash particle ratio of 10 μ m accounted for 6% o'clock, burst temperature, and 200 ℃, wet bulb ultimate compression strength 10.8N/ ball, dry bulb compression strength value are the 24.3N/ ball.8.6 times/ball of wet bulb dropping strength.4.2 times/ball of dry bulb dropping strength.
0.5～1.0%; Slaked lime 1～3%, carbon raw material 10-25%, all the other butt compositions are the dust of oxides-containing iron; Wet bulb group's water content is 9-11%.
Table 1
| Embodiment | Sodium salts humic acids | Slaked lime | Carbon raw material | The dust of oxides-containing iron |
| ??1 | ??0.5 | ??1 | ??15 | ??83.5 |
| ??2 | ??1 | ??1.5 | ??15 | ??82.5 |
| ??3 | ??1 | ??3 | ??15 | ??81 |
| ??4 | ??0.5 | ??1 | ??25 | ??73.5 |
| ??5 | ??1 | ??1.5 | ??25 | ??72.5 |
| ??6 | ??1 | ??3 | ??25 | ??71 |
| ??7 | ??0.8 | ??2.2 | ??20 | ??77 |
| Comparative Examples | ??- | ??- | ??15 | ??85 |
Claims (3)
1. the carbonaceous pelletizing of a high burst temperature, its butt composition quality per-cent is: Sodium salts humic acids 0.5～1.0%; Slaked lime 1～3%, carbon raw material 10-25%, all the other butt compositions are the dust of oxides-containing iron; Wet bulb group's water content is 9-11%.
2. the carbonaceous pelletizing of high burst temperature as claimed in claim 1 is characterized in that, in the described carbon raw material granularity the particle below the 10 μ m account for 90% or more than.
3. the carbonaceous pelletizing of high burst temperature as claimed in claim 1 or 2 is characterized in that, the dust of described oxides-containing iron and carbon raw material are blast furnace gas mud and/or coal ash.
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|---|---|---|---|
| CN200810041088A CN101638718A (en) | 2008-07-28 | 2008-07-28 | High burst temperature carbonic pellet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810041088A CN101638718A (en) | 2008-07-28 | 2008-07-28 | High burst temperature carbonic pellet |
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| CN101638718A true CN101638718A (en) | 2010-02-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978385A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Carbon-containing pellet for blast furnace |
| CN102978386A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Combined preparation method for carbon-containing pellet used for blast furnace |
| CN103255292A (en) * | 2013-05-22 | 2013-08-21 | 连云港腾翔金属材料有限公司 | Additive for carbonthermal reduction of nickel laterite ore |
| CN104164559A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Method for improving pelletizability of low-pelletizability iron concentrate |
| CN104164560A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Sodium humate adhesive solution for iron ore pellets as well as preparation method and application of sodium humate adhesive solution |
| CN104726698A (en) * | 2015-03-25 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Acidic composite metallized pellet and production process thereof |
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2008
- 2008-07-28 CN CN200810041088A patent/CN101638718A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978385A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Carbon-containing pellet for blast furnace |
| CN102978386A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Combined preparation method for carbon-containing pellet used for blast furnace |
| CN102978385B (en) * | 2012-10-31 | 2013-09-18 | 高金菊 | Carbon-containing pellet for blast furnace |
| CN102978386B (en) * | 2012-10-31 | 2013-09-25 | 高金菊 | Combined preparation method for carbon-containing pellet used for blast furnace |
| CN103255292A (en) * | 2013-05-22 | 2013-08-21 | 连云港腾翔金属材料有限公司 | Additive for carbonthermal reduction of nickel laterite ore |
| CN103255292B (en) * | 2013-05-22 | 2015-08-26 | 连云港腾翔金属材料有限公司 | A kind of red soil nickel ore carbothermic reduction additive |
| CN104164559A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Method for improving pelletizability of low-pelletizability iron concentrate |
| CN104164560A (en) * | 2014-08-28 | 2014-11-26 | 中南大学 | Sodium humate adhesive solution for iron ore pellets as well as preparation method and application of sodium humate adhesive solution |
| CN104164559B (en) * | 2014-08-28 | 2016-11-30 | 中南大学 | A kind of method improving difficult pelletizing iron ore concentrate balling-up |
| CN104726698A (en) * | 2015-03-25 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Acidic composite metallized pellet and production process thereof |
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