CN104911342A - Method for preparing chromium vanadium titano-magnetite pellets containing boron - Google Patents
Method for preparing chromium vanadium titano-magnetite pellets containing boron Download PDFInfo
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- CN104911342A CN104911342A CN201510409702.XA CN201510409702A CN104911342A CN 104911342 A CN104911342 A CN 104911342A CN 201510409702 A CN201510409702 A CN 201510409702A CN 104911342 A CN104911342 A CN 104911342A
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- titanium ferroferrite
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Abstract
The invention discloses a method for preparing chromium vanadium titano-magnetite pellets containing boron, which comprises following steps: 1 chromium vanadium titano-magnetite powder and common rion iron mine powder are prepared to be used as raw materials; 2 the raw materials are uniformly fixed by adding water, and then are braised to be made into fresh pellets; 3 a part of raw materials with 9-14mm particle sizes are selected to dry; 4 the raw materials are heated to 900+_5 DEG C to start to oxidize and roast, then are heated to 1275+_5 DEG C in the speed of 4-6 DEG C/min, are kept in the 1275+_5 DEG C for at least 20min to oxidize and roast, and are cooled in the air along with cooling of a furnace. Oxidized pellets which are obtained by roasting the fresh pellets through the method for preparing the chromium vanadium titano-magnetite pellets containing the boron generate substances such as magnesium aluminate spinel and the like, thereby improving compressive strength of the oxidized pellets above 2500N, and effectively improving quality and yield of pellet mines.
Description
Technical field
The invention belongs to technical field of mineral processing, particularly a kind of preparation method containing chromic vanadium-titanium ferroferrite pelletizing of boracic.
Background technology
Contain higher vanadium, titanium, chromium component containing chromic vanadium-titanium ferroferrite, comprehensive utilization value is high; The flow process can carrying out heavy industrialization application to it is at present blast furnace-bof process.In China's present stage, pellet accounts for the ratio of blast furnace feeding furnace charge at about 20-30%, and blast-furnace smelting is no exception containing chromic vanadium-titanium ferroferrite, even reaches 40%.Therefore, produce the chromium type vanadium-titanium pellet that contains with high yield and quality and just there is very important effect.
In prior art, do not reach the problem of blast fumance processing requirement containing chromic vanadium-titanium ferroferrite pelletizing ubiquity ultimate compression strength, finally affect the Quality and yield of product.
Summary of the invention
For existing the problems referred to above existed containing chromic vanadium-titanium ferroferrite acid pellet ultimate compression strength, the invention provides a kind of preparation method containing chromic vanadium-titanium ferroferrite pelletizing of boracic, by adding boron trioxide in breeze, then through stewing material-pelletizing-roasting, make the pelletizing that ultimate compression strength is high.
The preparation method containing chromic vanadium-titanium ferroferrite pelletizing of boracic of the present invention carries out according to the following steps:
1, prepare containing chromic vanadium-titanium ferroferrite powder and common powdered iron ore as raw material, prepare boron trioxide as additive; 20 ~ 40% of raw material gross weight are accounted for containing chromic vanadium-titanium ferroferrite powder; Boron trioxide is 0.3 ~ 3% of raw material gross weight;
2, raw material and additive are added water and mix, the water added accounts for 7 ~ 9% of raw material and additive gross weight; Then stewing material 35 ~ 45min, makes the uniform moisture in raw material; Adopt balling disk (-sc) to add water again and make green-ball, the weight content controlling water in green-ball is 8 ~ 10%;
3, choose particle diameter in green-ball and, in the part of 9 ~ 14mm, under 105 ± 5 DEG C of conditions, dry at least 5h;
4, the green-ball after oven dry is carried out oxidizing roasting, oxidizing roasting step is: be first warming up to 900 ± 5 DEG C and start oxidizing roasting, then 1275 ± 5 DEG C are warming up to the speed of 4 ~ 6 DEG C/min, at least 20min is incubated at 1275 ± 5 DEG C, complete oxidizing roasting, after being cooled to 900 ± 5 DEG C with stove, air cooling is to normal temperature, and what obtain boracic contains chromic vanadium-titanium ferroferrite pelletizing.
Above-mentioned accounts for more than 30% of gross weight containing the part below granularity 200 order in chromic vanadium-titanium ferroferrite powder, part in common powdered iron ore below granularity 200 order accounts for more than 80% of gross weight, and the part in boron trioxide below granularity 200 order accounts for more than 40% of gross weight.
In aforesaid method, in step 2, in green-ball process processed, balling disk (-sc) rotating speed is 17 ~ 19r/min.
In aforesaid method, choose in green-ball that particle diameter is after the part of 9 ~ 14mm in step 3, remaining part returns step 2 and re-starts pelletizing.
In aforesaid method, control heat-up rate when being warming up to 900 ± 5 DEG C in step 4 at 10 ± 5 DEG C/min.
The ultimate compression strength containing chromic vanadium-titanium ferroferrite pelletizing of above-mentioned boracic is at more than 2500N.
Method of the present invention by adding boron trioxide in breeze, the materials such as magnesium-aluminium spinel are had to generate in the acid pellet obtained by green-ball roasting, thus make the ultimate compression strength of acid pellet bring up to more than 2500N, reach the requirement of blast fumance, well solve the problem not reaching blast fumance processing requirement containing chromic vanadium-titanium ferroferrite acid pellet ultimate compression strength, effectively improve the Quality and yield of pellet.
Embodiment
The TFe containing chromic vanadium-titanium ferroferrite powder selected in the embodiment of the present invention is 62 ~ 63%, and main component is by weight percentage containing FeO 27 ~ 28%, CaO 0.2 ~ 0.3%, SiO
22 ~ 3%, MgO 0.6 ~ 0.9%, Al
2o
33 ~ 5%, TiO
24 ~ 6%, V
2o
51 ~ 1.2%, Cr
2o
30.5 ~ 0.6%, S≤0.16%, P≤0.02%.
The TFe of the common powdered iron ore selected in the embodiment of the present invention is 65 ~ 69%, and main component is by weight percentage containing FeO 23 ~ 28%, CaO 0.1 ~ 0.2%, SiO
24 ~ 9%, MgO 0.1 ~ 0.3%, Al
2o
30.05 ~ 0.4%, S≤0.1%, P≤0.02%.
The boron trioxide adopted in the embodiment of the present invention is commercial products, and purity is >=98%.
The intensity test equipment adopted in the embodiment of the present invention is electronic universal tester.
What adopt in the embodiment of the present invention accounts for more than 30% of gross weight containing the part below granularity 200 order in chromic vanadium-titanium ferroferrite powder, part in common powdered iron ore below granularity 200 order accounts for more than 80% of gross weight, and the part in boron trioxide below granularity 200 order accounts for more than 40% of gross weight.
Stewing material in the embodiment of the present invention refers to and the material plastics bag after adding water or plastic paper is covered.
Embodiment 1
Prepare containing chromic vanadium-titanium ferroferrite powder and common powdered iron ore as raw material, prepare boron trioxide as additive; 20% of raw material gross weight is accounted for containing chromic vanadium-titanium ferroferrite powder; Boron trioxide is 0.3% of raw material gross weight;
Raw material and additive are added water and mix, the water added accounts for 7% of raw material and additive gross weight; Then stewing material 35min, makes the uniform moisture in raw material; Adopt balling disk (-sc) to add water again and make green-ball, the weight content controlling water in green-ball is 8%;
Choose particle diameter in green-ball and, in the part of 9 ~ 14mm, under 105 ± 5 DEG C of conditions, dry 5h; Remaining part returns previous step and re-starts pelletizing;
Green-ball after drying is carried out oxidizing roasting, oxidizing roasting step is: first control heat-up rate at 10 ± 5 DEG C/min, be warming up to 900 ± 5 DEG C and start oxidizing roasting, then 1275 ± 5 DEG C are warming up to the speed of 6 DEG C/min, at 1275 ± 5 DEG C of insulation 35min, complete oxidizing roasting, after being cooled to 900 ± 5 DEG C with stove, air cooling is to normal temperature, and what obtain boracic contains chromic vanadium-titanium ferroferrite pelletizing; Ultimate compression strength 2648N.
Embodiment 2
Method is with embodiment 1, and difference is:
(1) 30% of raw material gross weight is accounted for containing chromic vanadium-titanium ferroferrite powder; Boron trioxide is 1% of raw material gross weight;
(2) raw material and additive are added water and mix, the water added accounts for 8% of raw material and additive gross weight; Stewing material 40min; The weight content controlling water in green-ball when making green-ball is 9%;
(3) choose particle diameter in green-ball and, in the part of 9 ~ 14mm, under 105 ± 5 DEG C of conditions, dry 6h;
(4) 1275 ± 5 DEG C are warming up to the speed of 5 DEG C/min, at 1275 ± 5 DEG C of insulation 30min;
Boracic containing chromic vanadium-titanium ferroferrite pelletizing; Ultimate compression strength 3749N.
Embodiment 3
Method is with embodiment 1, and difference is:
(1) 35% of raw material gross weight is accounted for containing chromic vanadium-titanium ferroferrite powder; Boron trioxide is 2% of raw material gross weight;
(2) raw material and additive are added water and mix, the water added accounts for 8% of raw material and additive gross weight; Stewing material 40min; The weight content controlling water in green-ball when making green-ball is 9%;
(3) choose particle diameter in green-ball and, in the part of 9 ~ 14mm, under 105 ± 5 DEG C of conditions, dry 7h;
(4) 1275 ± 5 DEG C are warming up to the speed of 5 DEG C/min, at 1275 ± 5 DEG C of insulation 25min;
Boracic containing chromic vanadium-titanium ferroferrite pelletizing; Ultimate compression strength 4813N.
Embodiment 4
Method is with embodiment 1, and difference is:
(1) 40% of raw material gross weight is accounted for containing chromic vanadium-titanium ferroferrite powder; Boron trioxide is 3% of raw material gross weight;
(2) raw material and additive are added water and mix, the water added accounts for 9% of raw material and additive gross weight; Stewing material 45min; The weight content controlling water in green-ball when making green-ball is 10%;
(3) choose particle diameter in green-ball and, in the part of 9 ~ 14mm, under 105 ± 5 DEG C of conditions, dry 8h;
(4) 1275 ± 5 DEG C are warming up to the speed of 4 DEG C/min, at 1275 ± 5 DEG C of insulation 20min;
Boracic containing chromic vanadium-titanium ferroferrite pelletizing; Ultimate compression strength 5636N.
Claims (5)
1. the preparation method containing chromic vanadium-titanium ferroferrite pelletizing of boracic, is characterized in that carrying out according to the following steps:
(1) prepare containing chromic vanadium-titanium ferroferrite powder and common powdered iron ore as raw material, prepare boron trioxide as additive; 20 ~ 40% of raw material gross weight are accounted for containing chromic vanadium-titanium ferroferrite powder; Boron trioxide is 0.3 ~ 3% of raw material gross weight;
(2) raw material and additive are added water and mix, the water added accounts for 7 ~ 9% of raw material and additive gross weight; Then stewing material 35 ~ 45min, makes the uniform moisture in raw material; Adopt balling disk (-sc) to add water again and make green-ball, the weight content controlling water in green-ball is 8 ~ 10%;
(3) choose particle diameter in green-ball and, in the part of 9 ~ 14mm, under 105 ± 5 DEG C of conditions, dry at least 5h;
(4) green-ball after oven dry is carried out oxidizing roasting, oxidizing roasting step is: be first warming up to 900 ± 5 DEG C and start oxidizing roasting, then 1275 ± 5 DEG C are warming up to the speed of 4 ~ 6 DEG C/min, at least 20min is incubated at 1275 ± 5 DEG C, complete oxidizing roasting, after being cooled to 900 ± 5 DEG C with stove, air cooling is to normal temperature, and what obtain boracic contains chromic vanadium-titanium ferroferrite pelletizing.
2. the preparation method containing chromic vanadium-titanium ferroferrite pelletizing of a kind of boracic according to claim 1, it is characterized in that the described part contained in chromic vanadium-titanium ferroferrite powder below granularity 200 order accounts for more than 30% of gross weight, part in described common powdered iron ore below granularity 200 order accounts for more than 80% of gross weight, and the part in described boron trioxide below granularity 200 order accounts for more than 40% of gross weight.
3. a kind of boracic according to claim 1 containing the preparation method of chromic vanadium-titanium ferroferrite pelletizing, it is characterized in that choosing in step (3) in green-ball that particle diameter is after the part of 9 ~ 14mm, remaining part returns step (2) and re-starts pelletizing.
4. the preparation method containing chromic vanadium-titanium ferroferrite pelletizing of a kind of boracic according to claim 1, controls heat-up rate at 10 ± 5 DEG C/min when it is characterized in that being warming up to 900 ± 5 DEG C in step (4).
5. the preparation method containing chromic vanadium-titanium ferroferrite pelletizing of a kind of boracic according to claim 1, is characterized in that the ultimate compression strength containing chromic vanadium-titanium ferroferrite pelletizing of boracic is at more than 2500N.
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Cited By (3)
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| CN105907956A (en) * | 2016-06-27 | 2016-08-31 | 东北大学 | Low-grade chromium-containing vanadium titanium magnetite oxidized pellet and preparation method thereof |
| CN107475514A (en) * | 2017-07-26 | 2017-12-15 | 东北大学 | A kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing |
| CN109554550A (en) * | 2018-11-26 | 2019-04-02 | 贵州大学 | A kind of method of steel-making dust comprehensive utilization recycling zinc |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105907956A (en) * | 2016-06-27 | 2016-08-31 | 东北大学 | Low-grade chromium-containing vanadium titanium magnetite oxidized pellet and preparation method thereof |
| CN105907956B (en) * | 2016-06-27 | 2017-11-03 | 东北大学 | A kind of low-grade acid pellet containing chromic vanadium-titanium ferroferrite and preparation method thereof |
| CN107475514A (en) * | 2017-07-26 | 2017-12-15 | 东北大学 | A kind of preparation method of high-chromic vanadium-titanium ferroferrite pelletizing |
| CN109554550A (en) * | 2018-11-26 | 2019-04-02 | 贵州大学 | A kind of method of steel-making dust comprehensive utilization recycling zinc |
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