CN102828024A - Self-reduction carbon-containing pellet - Google Patents
Self-reduction carbon-containing pellet Download PDFInfo
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- CN102828024A CN102828024A CN2011101602029A CN201110160202A CN102828024A CN 102828024 A CN102828024 A CN 102828024A CN 2011101602029 A CN2011101602029 A CN 2011101602029A CN 201110160202 A CN201110160202 A CN 201110160202A CN 102828024 A CN102828024 A CN 102828024A
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Abstract
The invention discloses a self-reduction carbon-containing pellet which is suitable for production of grained iron by a horizontal moving bed reduction process. The carbon-containing pellet comprises the following components of: by weight, 60-80% of an iron-containing raw material (dry basis), 10-35% of a carbon-containing raw material (dry basis), 1-5% of a binder (dry basis) and an additive. The invention is characterized in that a calcium ferrite powder is used as the additive; its dry basis content is 5-10 wt%; and C/O in the chemical components is controlled within 1.1-1.3. The self-reduction carbon-containing pellet provided by the invention will not erode refractory materials or destroy the environment, and can be used to improve melting performance of slag and produce grained iron with large granularity at the roasting temperature of 1350-1450 DEG C.
Description
Technical field
The present invention relates to be used for the carbonaceous pelletizing of smelting iron and steel, the autoreduction carbonaceous pelletizing that particularly a kind of horizontal moving bed reducing process is used.
Background technology
Carbonaceous pelletizing typically refers to by the iron content powder and is equipped with certain carbon element (like coal dust and coke powder etc.) and suitable sticker, behind thorough mixing, suppresses the ferruginous ball-type briquetting of a kind of carbon containing that forms through ball press.In ferrous metallurgy neck city, different metallurgical technologies, also different to the requirement of carbonaceous pelletizing.In with the non-blast furnace ironmaking technology that directly is reduced to purpose, the open carbonaceous pelletizing of using generally adopts following composition:
Iron-bearing material butt composition quality per-cent is 50%～85%, and carbon raw material butt composition quality per-cent is 7%～35%, and sticker butt composition quality per-cent is 1%～11%, and additives dry based component mass percent is 0%～5%.Iron-bearing material comprises: fine iron breeze, iron scale and ion dust mud contaning etc.; Carbon raw material comprises: coal dust, coke powder and contain carbon dust mud etc.; Sticker comprises: wilkinite, cement, water glass, borate, clay, coal tar, petroleum slag, flyash, spent pulping liquor, syrup, marine plant, humic acids, various starch, water glass, pendant benefit, polypropylene phthalein amine etc.; Additive comprises: lime, Wingdale, slaked lime, rhombspar, fluorite etc.
Existing carbonaceous pelletizing needs very high maturing temperature (>=1450 ℃) could realize that scum dissolves branch in reduction process, and its major cause is that the melting properties of slag is bad.Though add the melting properties that an amount of fluorite can improve slag, can cause serious erosion to refractory materials, and influence environment.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art; Technical problem to be solved by this invention provides a kind of autoreduction carbonaceous pelletizing that is applicable to horizontal moving bed reducing process production granulated iron; Introduce a kind of melting properties that can improve slag; Not erosion of refractory and the additive that destroys environment again are implemented in the granulated iron of producing volume particle size under 1350～1450 ℃ the maturing temperature.
A kind of autoreduction carbonaceous pelletizing; Its composition comprises that iron-bearing material butt composition quality per-cent is 60%～80%, carbon raw material butt composition quality per-cent is 10%～35%, sticker butt composition quality per-cent is 1%～5% and additive; It is characterized in that additive adopts the ferrous acid calcium powder; Its butt composition quality per-cent is 5%～10%, and C/O is 1.1～1.3 in the control chemical ingredients.
The employed raw material of composite pellet of the present invention is Powdered, and particle diameter reaches more than 70% less than the ratio of 0.074mm.
The employed iron-bearing material of composite pellet of the present invention comprises fine iron breeze, iron scale and ion dust mud contaning etc.
The employed carbon raw material of composite pellet of the present invention comprises coal dust, coke powder and blast furnace dust etc.
The employed sticker of composite pellet of the present invention comprises wilkinite, water glass etc.
The calcium ferrite content of the employed ferrous acid calcium powder of carbonaceous pelletizing of the present invention is greater than 95%.
The fixed carbon content of the employed coal dust of carbonaceous pelletizing of the present invention is greater than 70%, and sulphur content is less than 1%.
The method of manufacture of carbonaceous pelletizing of the present invention is following: at first prepare burden according to its Chemical Composition, and solid materials is carried out fragmentation roll, reach required granularity; Then the pressed powder material is put into mixer and mix, after mixing, drop into liquid adhesive again; And mix once more, after mixing final mixture is sent in the ball press, be pressed into pelletizing; After treating the pelletizing drying, promptly become carbonaceous pelletizing of the present invention.
Because calcium ferrite has fusing point low (1216 ℃); Reducing property is good, changes the fireballing characteristics of slag, and therefore carbonaceous pelletizing of the present invention compared with prior art; Have following obviously advantage: 1, carbonaceous pelletizing of the present invention is in horizontal moving bed reducing process is produced; Maturing temperature is merely 1350～1450 ℃, reduces apparent in viewly, and energy-saving effect is remarkable; 2, carbonaceous pelletizing of the present invention is floride-free, in horizontal moving bed reducing process is produced, not erosion of refractory, do not influence environment; 3, owing to contain ferro element in the additive ferrous acid calcium powder,, increase iron output so can improve the ferrous grade of carbonaceous pelletizing.
Embodiment
Below in conjunction with embodiment the present invention is further specified:
Embodiment 1
At first prepare burden (control chemical ingredients in C/O=1.2), and material is put into mixer mix, after mixing according to mass percent fine iron breeze 69%, coal dust 22%, ferrous acid calcium powder 7%, wilkinite 2%; Inject suitable quantity of water; And mix once more, after mixing final mixture is sent in the ball press, be pressed into pelletizing; After treating the pelletizing drying, promptly become autoreduction carbonaceous pelletizing of the present invention.The autoreduction carbonaceous pelletizing is used for the continuous reduction furnace technology of pallet car type, 1350 ℃ of Heating temperatures, recovery time 20min can obtain the granulated iron of 5～20mm.
Embodiment 2
At first prepare burden (control chemical ingredients in C/O=1.1), and material is put into mixer mix, after mixing according to mass percent ion dust mud contaning 11%, iron scale 49%, blast furnace dust 31%, ferrous acid calcium powder 8% and wilkinite 1%; Drop into a spot of water glass and water; And mix once more, after mixing final mixture is sent in the ball press, be pressed into pelletizing; After treating the pelletizing drying, promptly become composite carbon containing pellet of the present invention.The autoreduction carbonaceous pelletizing is used for rotary hearth furnace process, 1350 ℃ of Heating temperatures, recovery time 20min can obtain the granulated iron of 5～20mm.
Claims (3)
1. autoreduction carbonaceous pelletizing; Its composition comprises that iron-bearing material butt composition quality per-cent is 60%～80%, carbon raw material butt composition quality per-cent is 10%～35%, sticker butt composition quality per-cent is 1%～5% and additive; It is characterized in that additive adopts the ferrous acid calcium powder; Its butt composition quality per-cent is 5%～10%, and C/O is 1.1～1.3 in the control chemical ingredients.
2. according to the said autoreduction carbonaceous pelletizing of claim 1, it is characterized in that: described raw material is Powdered, and particle diameter reaches more than 70% less than the ratio of 0.074mm.
3. according to claim 1 or 2 said autoreduction carbonaceous pelletizings, it is characterized in that: the calcium ferrite content of described ferrous acid calcium powder is greater than 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101602029A CN102828024A (en) | 2011-06-14 | 2011-06-14 | Self-reduction carbon-containing pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101602029A CN102828024A (en) | 2011-06-14 | 2011-06-14 | Self-reduction carbon-containing pellet |
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| Publication Number | Publication Date |
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| CN102828024A true CN102828024A (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2011101602029A Pending CN102828024A (en) | 2011-06-14 | 2011-06-14 | Self-reduction carbon-containing pellet |
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| CN (1) | CN102828024A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940092A (en) * | 2005-09-27 | 2007-04-04 | 万天骥 | Fuse reducing iron-smelting process for rotating furnace |
| CN101092664A (en) * | 2007-06-28 | 2007-12-26 | 南京钢铁联合有限公司 | Method for processing dust with zinc of electric furnace |
| CN101649391A (en) * | 2009-06-26 | 2010-02-17 | 中冶长天国际工程有限责任公司 | Green pellet and pellet ore preparation method |
| CN101748235A (en) * | 2009-12-31 | 2010-06-23 | 辽宁天和矿产有限公司 | A kind of metallurgical auxiliary material fluxing agent and preparation method thereof |
-
2011
- 2011-06-14 CN CN2011101602029A patent/CN102828024A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940092A (en) * | 2005-09-27 | 2007-04-04 | 万天骥 | Fuse reducing iron-smelting process for rotating furnace |
| CN101092664A (en) * | 2007-06-28 | 2007-12-26 | 南京钢铁联合有限公司 | Method for processing dust with zinc of electric furnace |
| CN101649391A (en) * | 2009-06-26 | 2010-02-17 | 中冶长天国际工程有限责任公司 | Green pellet and pellet ore preparation method |
| CN101748235A (en) * | 2009-12-31 | 2010-06-23 | 辽宁天和矿产有限公司 | A kind of metallurgical auxiliary material fluxing agent and preparation method thereof |
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Application publication date: 20121219 |