CN101343688A - Pelletization method for vanadium titanium magnet ore concentrate mix with additive rough rice shell - Google Patents
Pelletization method for vanadium titanium magnet ore concentrate mix with additive rough rice shell Download PDFInfo
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- CN101343688A CN101343688A CNA2008103041440A CN200810304144A CN101343688A CN 101343688 A CN101343688 A CN 101343688A CN A2008103041440 A CNA2008103041440 A CN A2008103041440A CN 200810304144 A CN200810304144 A CN 200810304144A CN 101343688 A CN101343688 A CN 101343688A
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Abstract
The invention relates to a granulating method for adding rice hulls in vanadium-titanium magnetite concentrate mixing material, which belongs to the metallurgical field. The invention solves the technical problem that a granulating method of vanadium-titanium magnetite concentrate mixing material with stable granulating effect is provided. The invention comprises the steps: 0.4 percent to 0.6 percent of the rice hulls of the mixing material is added into the vanadium-titanium magnetite concentrate mixing material and is mixed evenly, then granulation is performed; and the rice hulls are sprayed with a calcium-bearing solution before being mixed. The granulating method for adding rice hulls in vanadium-titanium magnetite concentrate mixing material can not only improve the granulating effect, but also prevent the rice hulls from being burned by hot return fines, thus stabilizing the sintered ore production and improving the product quality; in addition, the automatic feeding function of the rice hulls is realized, which is convenient for accurate control of the feeding quantity, and the labor intensity of manual feeding is decreased, therefore, the granulating method has an extensive application prospect.
Description
Technical field
The present invention relates to the vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating, belong to field of metallurgy.
Background technology
Vanadium titanium magnet ore concentrate mix is generally powdered iron ore, returns mine, flux, fuel mix are made.Particularly the v-ti magnetite concentrate iron-holder is generally lower owing to China's powdered iron ore, also adds some higher-grades or middle grade powdered iron ore usually, for example import ore deposit (Australia ore deposit, India ore deposit, Brazilian ore deposit) etc.Vanadium titanium magnet ore concentrate mix is that different material is put into different ore deposits groove (seeing accompanying drawing 1) when mixing, press the different ratios batching by computer control, all raw materials feed on the proportioning belt, be transported to again on another compound belt, enter then in a drum mixer and mix about 3min, enter about 4min that granulates in the secondary drum mixer again.
The v-ti magnetite concentrate coarse size of China's Panzhihua Region,＜200 order grain size contents are less than 50%, than common concentrate low 40～50%, and vanadium titano-magnetite belongs to hydrophobic mineral, the wetting ability extreme difference causes this concentrate pellet performance poor, and the balling-up effect is bad, seriously restrict the size composition and the ventilation property of compound, influenced yield and quality.Therefore, improve compound balling-up effect and ventilation property and become one of this area research emphasis.
Nineteen eighty-three, Wuhan Iron and Steel Company's sintering plant carried out the commerical test of vanadium titano-magnetite mix with additive rough rice shell, can reduce the resistance of the bed of material in the sintering process, at negative pressure 13000Pa, 11000Pa, when bed of material 450mm, 500mm, 550mm, 600mm, add a certain proportion of rice hulls, every sintering index all obtains improvement in various degree.In the same year, Wuhan Iron ﹠ Steel College and following land Steel Plant cooperate, and have carried out high concentrate than the sintering commerical test of adding rice hulls, when not adding rice hulls, and adapted 20% concentrate, yield rate is very low.After adding rice hulls, the concentrate ratio progressively is increased to 100% by 20%, and agglomerate output on average increases by 15～30%.Anyang Steel Plant had also carried out sintering with addition of the rice hulls type approval test in 1994, had obtained and had improved the effect that productive rate cuts down the consumption of energy.Mei Shan Usiminas in 1988 has carried out the laboratory test that sinter mixture adds rice hulls.
But all there is following problems in the commerical test of above-mentioned interpolation rice hulls: 1, rice hulls is easily burnt by the hot returning ore of red heat, makes vanadium titanium magnet ore concentrate mix granulating efficiency instability, thereby influences the yield and quality of agglomerate; 2, above-mentioned commerical test all adopts the hand-fed mode to shed rice hulls in primary mixer, is difficult to grasp exactly with addition of amount, simultaneously because personnel are reinforced, hand-fed exists and is interrupted, dosage utmost point problem of unstable, and labour intensity is very big, work under bad environment.
Summary of the invention
Technical problem to be solved by this invention is the method for granulating that the good and stable vanadium titanium magnet ore concentrate mix of a kind of granulating efficiency is provided at above-mentioned deficiency.
Vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating of the present invention is the rice hulls and the mixing of compound 0.4～0.6% prior to adding weight proportion in the vanadium titanium magnet ore concentrate mix, granulates then; Wherein, rice hulls is used earlier the calcic spray solution before mixing.
The iron-holder of above-mentioned v-ti magnetite concentrate is 52-54%, and the ratio of v-ti magnetite concentrate is the 50-60% of compound total amount, all the other raw materials in the compound as: return mine, flux, fuel etc. routinely consumption add and get final product.
Sprinkling contains calcium solution can make the rice hulls calcification, forms the hard skeleton structure, can not only further improve granulating efficiency through the rice hulls of calcification, and can prevent that rice hulls from being burnt by hot returning ore, makes sinter quality stable.Wherein, the calcium solution that contains commonly used may be used to spray rice hulls, dissolves fully in order to guarantee calcareous material, preferred CaCl
2Obtain solution.Can evenly be sprayed at the rice hulls surface and make rice hulls wetting as long as contain calcium solution, better in order to make granulating efficiency, the mass concentration that contains calcium solution is preferably 0.6～1.0%, and the mass concentration that contains calcium solution most preferably is 0.8%.
The hot returning ore temperature very easily makes rice hulls fire burns up to 800-1000 ℃.At the hot returning ore garden Pan Xialiaochu that compound must pass through, one filler pipe can be set, spraying water in right amount on compound, (amount of water is too much unsuitable, till returning mine of red heat extinguished), make and to be extinguished immediately by hot returning ore incendiary rice hulls, water spray back rice hulls in operation process can not be burnt once more, guarantees the use properties of rice hulls.The water vapor that alleviates the generation of hot returning ore water spray for material spreads, and worsens environment, can one tightness system be set in hot returning ore blanking place and add a chimney, with the drainage water steam.
For simplify rice hulls with addition of mode, make the rice hulls blanking equal, be convenient to control, can be at the selected ore deposit groove of proportioning room, preferred first ore deposit groove with addition of ore deposit groove (being last ore deposit groove of proportioning room strap end), is seen accompanying drawing 2 as rice hulls, and rice hulls is contained in the groove of batching ore deposit, by batching disk and computer control feed, make rice hulls in the ore admixtion, participate in batching.Owing to be first ore deposit groove of feed proportioning system, fall behind the bottommost that is laid down on belt under the rice hulls, operation along with belt, the fine ore of a plurality of ore deposits, back groove, rich ore powder etc. then be layered on rice hulls above, when admixtion ploughs under next bar belt at proportioning room belt head flaw, rice hulls has been carried out preliminary the mixing with concentrate, and adhesion section iron ore concentrate on the rice hulls also can prevent to be burnt by the hot returning ore of postorder blanking.
The beneficial effect of vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating of the present invention is: because rice hulls has been sprayed and contained calcium solution, can not only further improve granulating efficiency, and can prevent that rice hulls from being burnt by hot returning ore, the agglomerate yield and quality is improved and stable; Realized rice hulls self-feeding function, be convenient to accurately control feeding quantity, and alleviated the labour intensity of hand-fed, had broad application prospects.
Description of drawings
Fig. 1 is existing vanadium titanium magnet ore concentrate mix batching schema;
Fig. 2 is the schema that v-ti magnetite concentrate adds the rice hulls batching.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is further described.
1, sintered material proportioning
By weight percentage, the domestic middle grade fine ore of the 55% concentrate+domestic higher-grade fine ore of 10% Australia ore deposit+12%+3%+7% unslaked lime+6% Wingdale+5% coke powder
Described rice hulls is the accessory substance of rice manufacturing enterprise processing rice, be shaped as the half-open position after the paddy particle takes off rice, most of opening for the vertical plane of whole rice hulls is the shape of two lobes, has " abnormity " structure, and the performance that adheres to fine ore and unslaked lime as skeleton is extremely strong.
In the SINTERING PRODUCTION rice hulls ratio for not with addition of, with addition of 0.4%, with addition of 0.6% 3 kind of mode, ratio is the per-cent of raw materials for sintering weight.
2, the raw material granularity composition sees Table 1,2.
The size composition of table 1 v-ti magnetite concentrate (weight percent, %)
Table 2 powdered iron ore, flux, fuel granularity are formed
The described dry screen of table 1 is that concentrate oven dry moisture sieves in air, and water sieve is that concentrate sieves in water.
3, technical process: get the raw materials ready → prepare burden → mixed once → secondary mixing → cloth → igniting, exhausting, sintering → heat fragmentation → heat screening → cooling → sintering screening → ditch screening → blast-furnace smelting down
Mixed once 3min wherein, secondary mixes (granulation) 4min.
4, processing parameter control
Sinter machine machine speed 1.6-1.8m/min, sintering negative pressure 12000-12500Pa, is responsible for 105-115 ℃ of spent air temperture, 240-290 ℃ of sintering end point temperature by ignition temperature 1060-1120 ℃.Mixture moisture 7.2-7.4%, fixed carbon 2.5-2.8%.Bed thickness is determined according to mixture ventilation and sintering end point, generally is controlled at 500-550mm.
5, result
Made 3 batches of agglomerate by the inventive method, rice hulls is strengthened granulating efficiency and is seen Table 3, and sintering effect sees Table 4.
Table 3 uses the different ratios rice hulls and does not use the size composition of rice hulls compound
Table 4 uses the different ratios rice hulls and does not use rice hulls sintering technology index
| Lot number | Rice hulls proportioning % | Bed thickness mm | Sintering velocity mm min | Barrate strength % | Wear-resistant index % | Yield rate % | Utilization coefficient t/m 2.h | |
| 1 | 0 | 494 | 18.06 | 71.28 | 6.42 | 70.44 | 1.319 | 55.39 |
| 2 | 0.4 | 525 | 19.19 | 71.27 | 6.44 | 69.89 | 1.386 | 53.82 |
| 3 | 0.6 | 537 | 19.67 | 71.22 | 6.46 | 69.63 | 1.417 | 51.63 |
As can be seen from Table 4, with the compound that the inventive method is granulated, its sintering velocity and utilization coefficient improve, and have reduced solid burnup.
Embodiment 2
1, sprays and do not spray the comparative test result that contains calcium solution
The compound that adds rice hulls 0.4% (weight percent) do not sprayed with not spraying contain calcium solution (CaCl2 solution, mass concentration are 0.8%), made 2 batches of agglomerate, the results are shown in Table 5, table 6 by the inventive method.
Table 5 rice hulls is sprayed and is not sprayed and contains the size composition of calcium solution compound
Table 6 rice hulls is sprayed and is not sprayed and contains calcium solution sintering technology index
| Lot number | Whether sprinkling contains calcium solution | Rice hulls proportioning % | Bed thickness mm | Sintering velocity mm/min | Barrate strength % | Wear-resistant index % | Yield rate % | Utilization coefficient t/m 2.h | Solid burnup kg/ |
| 1 | Do not spray | 0.4 | 506 | 18.42 | 71.30 | 6.39 | 70.53 | 1.334 | 54.67 |
| 2 | Spray | 0.4 | 525 | 19.19 | 71.27 | 6.44 | 69.89 | 1.386 | 53.82 |
As can be seen from Table 5, use 0.4% rice hulls to spray and contain calcium solution (CaCl
2Solution) after, the sinter mixture size ratio is not sprayed and is contained calcium solution and want thick, and mean particle size increases 0.14mm, illustrate sprinkling contain rice hulls behind the calcium solution by hot returning ore burn less, strengthened granulation; As shown in Table 6, use and spray the compound sintering that contains calcium solution, sintering velocity is fast, and utilization coefficient improves, and solid burnup reduces.
Claims (5)
1. vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating is characterized in that: it is the rice hulls and the mixing of compound 0.4～0.6% that vanadium titanium magnet ore concentrate mix adds weight proportion, granulates then; Wherein, rice hulls is used earlier the calcic spray solution before mixing.
2. vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating according to claim 1 is characterized in that: the described calcium solution that contains is Ca (OH)
2Or CaCl
2Solution.
3. vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating according to claim 1 is characterized in that: the described mass concentration that contains calcium solution is 0.6～1.0%.
4. vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating according to claim 3 is characterized in that: the described mass concentration that contains calcium solution is 0.8%.
5. vanadium titanium magnet ore concentrate mix with additive rough rice shell method of granulating according to claim 1, it is characterized in that: the adding mode of described rice hulls is: first ore deposit groove of selecting vanadium titanium magnet ore concentrate mix when batching for use as rice hulls with addition of the ore deposit groove, rice hulls is contained in the groove of ore deposit, by batching disk and computer control feed, make rice hulls in ore-burden, participate in batching.
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| CN2008103041440A CN101343688B (en) | 2008-08-22 | 2008-08-22 | Pelletization method for vanadium titanium magnet ore concentrate mixing with additive rough rice shell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282544A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | Spraying agent for reducing edge effect of sintering trolley and using method |
| CN108588407A (en) * | 2018-06-19 | 2018-09-28 | 德龙钢铁有限公司 | A kind of method and cloth ball device improving permeability of sintering material bed |
-
2008
- 2008-08-22 CN CN2008103041440A patent/CN101343688B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282544A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | Spraying agent for reducing edge effect of sintering trolley and using method |
| CN106282544B (en) * | 2015-05-28 | 2018-05-29 | 鞍钢股份有限公司 | Spraying agent for reducing edge effect of sintering trolley and using method |
| CN108588407A (en) * | 2018-06-19 | 2018-09-28 | 德龙钢铁有限公司 | A kind of method and cloth ball device improving permeability of sintering material bed |
| CN108588407B (en) * | 2018-06-19 | 2019-09-24 | 德龙钢铁有限公司 | A kind of method and cloth ball device improving permeability of sintering material bed |
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| CN101343688B (en) | 2010-07-21 |
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Owner name: PANGANG GROUP IRON STEEL VANADIUM TITANIUM CO., LT Free format text: FORMER NAME: PANZHIHUA NEW STEEL + VANADIUM CO., LTD. |
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Address after: Panzhihua City, Sichuan province 617067 Xiangyang Village East Patentee after: Pangang Group Steel Vanadium & Titanium Co., Ltd. Address before: Panzhihua City, Sichuan province 617067 Xiangyang Village East Patentee before: Panzhihua New Steel & Vanadium Co., Ltd. |
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Granted publication date: 20100721 Termination date: 20160822 |