CN104215543B - A kind of moisture capacity of iron ore powders determinator and assay method - Google Patents
A kind of moisture capacity of iron ore powders determinator and assay method Download PDFInfo
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- CN104215543B CN104215543B CN201410413927.8A CN201410413927A CN104215543B CN 104215543 B CN104215543 B CN 104215543B CN 201410413927 A CN201410413927 A CN 201410413927A CN 104215543 B CN104215543 B CN 104215543B
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Abstract
A kind of moisture capacity of iron ore powders determinator and assay method, belong to metallurgical test technical field, in order to solve in prior art cannot the technical problem of Accurate Determining moisture capacity of iron ore powders.Technical scheme is: this device includes electronic balance I, electronic balance II, fixed platform, traverser, coupon, beaker, mark post and proximity switch, electronic balance I, II is respectively placed in fixed platform and traverser, traverser is placed in below fixed platform, traverser is provided with proximity switch and through hole, pass perpendicularly through the mark post of fixed platform and traverser through hole to be provided with and slidably sense ferrum, the coupon of up/down perforation hangs on electronic balance I time, and coupon lower end is sealed with the screen cloth laying filter paper；The interfacial tension according to water that measures of moisture capacity of iron ore powders carries out Iron Ore Powder saturated water adsorptive value test with buoyant equilibrium principle, is computed drawing accurate wet volume capacity value.The present invention install, simple to operate, highly sensitive, significantly improve wet volume capacity measure accuracy.
Description
Technical field
The present invention relates to a kind of moisture capacity of iron ore powders determinator and adopt this device to carry out moisture capacity of iron ore powders method for measuring, belonging to metallurgical test technical field.
Background technology
Mixture granulation process is requisite step before sintering, its objective is to be uniformly mixed and have the bead of certain particle size composition, because Iron Ore Powder, flux and fuel are in the process following cylindrical mixer upset, under the effect of water, above the granule of particle diameter<particle of 0.2mm can stick to particle diameter>0.7mm, therefore, except the intrinsic granularmetric composition of raw material is except after batch mixing, particle size distribution has impact, suitable water distribution quantity is also the key factor determining final mixing material distribution of particles.Wet volume capacity is one of important parameter of iron ore, in sintering process it decide sinter water distribution amount number, and then affect the quality of permeability of sintering material bed, the research of wet volume capacity reduces production cost and has great significance optimizing sintering process.The mensuration of wet volume capacity needs the height of the container immersed in liquid level of dress breeze to be typically smaller than 1mm, at present, insider has the method adopting U-tube to make the water surface parallel, with the naked eye observes the height of breeze container immersed in liquid level, but with the naked eye observation is difficult to control, and there is error bigger.
Summary of the invention
The present invention provides a kind of moisture capacity of iron ore powders determinator and adopts this device to carry out moisture capacity of iron ore powders method for measuring, can effectively solve moisture capacity of iron ore powders in prior art and be difficult to the technical problem of accurately mensuration, provide scientific basis for improving sintering granulating effect.
The technical scheme solving above-mentioned technical problem is:
A kind of moisture capacity of iron ore powders determinator, composition includes the electronic balance I being placed in fixed platform, the electronic balance II being placed in traverser, the fixed platform placed that is parallel to each other and traverser, through coupon, the beaker being placed on electronic balance II, mark post and the limit switch of being located in traverser, traverser is placed in below fixed platform, mark post upper end is connected with fixed platform, lower end passes perpendicularly through the through hole in traverser, through hole and mark post are matched in clearance, and mark post is provided with the sensing ferrum of activity；Coupon hangs on the hook bottom electronic balance I, links up with through the hole in fixed platform；Coupon lower end is fixed with screen cloth, and filter paper is laid in the screen cloth face within coupon.
Above-mentioned moisture capacity of iron ore powders determinator, described traverser is placed in 40～50cm place below fixed platform, vertically moves along mark post, and type of drive is that motor drives or hydraulic-driven.
Above-mentioned moisture capacity of iron ore powders determinator, the described screen cloth being fixed on coupon lower end is 160～250 eye mesh screens；The described filter paper being layed on the screen cloth within coupon matches for the internal diameter of circle, diameter and coupon.
Above-mentioned moisture capacity of iron ore powders determinator, in described coupon upper portion side wall, symmetry has two eyelets, and coupon is by hanging on through the lanyard of two eyelets on the hook bottom electronic balance I.
One utilizes said apparatus to carry out moisture capacity of iron ore powders method for measuring, carries out as follows:
The first step, dry and weigh: taking the fully dried 0.5-15mm grade circular hole standard screen screening of the Iron Ore Powder being not less than 1kg weight is 3～10 grades, calculate the percentage by weight of Iron Ore Powder gross weight shared by each grade, percentage by weight shared by each grade weighs the Iron Ore Powder that gross weight is (100～200g) ± 0.1g, it is designated as Mi(unit: gram), and fully mix.
Second step, demarcates: demarcating the water yield in beaker under not loading Iron Ore Powder state, demarcating steps is as follows:
A, first with lanyard coupon hung on the hook of electronic balance I, sensing ferrum on mark post is moved to mark post top, traverser is down to lowest point, beaker is placed on electronic balance II and resets, make coupon centrage overlap with beaker centrage, adds the water of 1/5～1/4 beaker capacity in beaker, rising traverser, stop as bottom surface, coupon lower end immersion underwater 1-2mm rising, keep 3-5s, make filter paper water suction fully saturated；
B, decline traverser, make coupon bottom surface leave the beaker water surface, stops when coupon bottom surface moves between beaker capacity 1/3～1/2 scale declining, and lowers the sensing ferrum on mark post to traverser through hole, is reset by reading after electronic balance I stable reading；
C, add water in beaker until the water surface from coupon bottom surface 1～2mm time, adopt dropper drip in beaker, when in beaker, the water surface is with when just contacting bottom coupon, electronic balance I reading is more than zero；Continue to add water to drop in beaker, when the reading of electronic balance I is zero, now burns the water yield that namely weight of water in the cup demarcate, be designated as WWater(unit: gram).
3rd step, charging: fall traverser and make coupon leave the water surface in beaker；In coupon, add load weighted (100～200g) ± 0.1g breeze so that it is natural packing, hang over the upper weighing of hook after installing, after record gross weight, balance is reset.
4th step, measure: promote traverser, when proximity switch senses the sensing ferrum on mark post, traverser is out of service, the reading of electronic balance I quickly transfers zero to, start timing, the reading of every 1～10 second identical interval record primary electron balance I, drips in beaker simultaneously, makes the weight of burning water in the cup remain WWater, when electronic balance I and the double error of the respective reading of electronic balance II are less than 0.05g, the reading of electronic balance I is saturated water adsorptive value, is designated as Mw(unit: gram).
5th step, verification: when breeze reaches capacity water absorption, falling traverser and make coupon leave the water surface, the reading of electronic balance II is still wWater, the reading of electronic balance I is still Mw, and the component that when illustrating to test, interfacial tension is downward reaches balance with suffered buoyancy, demarcate successfully, test data is accurate, if coupon leaves the absolute difference of electronic balance II reading before and after the water surface more than 0.5, it is necessary to re-calibrate demarcation water yield wWater。
6th step, takes out the Iron Ore Powder after test and filter paper, coupon is rinsed well and after drying, putting into new filter paper, after soaking filter paper, repetition the 3rd step, the 4th step are tested next time, guarantee every kind of breeze duplicate detection three times, finally take the meansigma methods of its Iron Ore Powder saturated water adsorptive value.
7th step, calculates moisture capacity of iron ore powders, according to formula: Mc=(Mw/Mi) × 100% calculates, by the wet volume capacity value of three result of the tests on average i.e. this Iron Ore Powder.
In formula, the wet volume capacity (unit: %) of Mc-breeze；
MWThe saturated water adsorptive value of-breeze (unit: gram)；
MiThe quality of-breeze drying regime (unit: gram).
The assay method of above-mentioned moisture capacity of iron ore powders, the drying mode of described first step Iron Ore Powder is oven drying, and oven temperature is 105 ± 10 DEG C, 2-3 hour drying time.
Apparatus of the present invention install, simple to operate, highly sensitive, adopt what this device carried out moisture capacity of iron ore powders to measure according to the interfacial tension of water and buoyant equilibrium principle, the method using weight defines interfacial tension and the buoyant equilibrium of water, can greatly improve the accuracy that wet volume capacity measures, avoid the generation of personal error, for improving sintering granulating effect, determining that the Reasonable water yield provides technical support, can be widely popularized in the mensuration field of all mineral wet volume capacitys.
Accompanying drawing explanation
Fig. 1 is wet volume capacity determinator schematic diagram of the present invention.
Fig. 2 is wet volume capacity determinator traverser schematic diagram of the present invention.
In figure, labelling is as follows: 1 electronic balance I, 2 electronic balance II, 3 fixed platform, 4 traversers,
5 coupons, 6 beakers, 7 mark posts, 8 proximity switches, 9 sensing ferrum, 10 through holes, 11 screen clothes, 12 filter paper, 13 lanyards, 14 hooks, 15 holes, 16 eyelets.
Detailed description of the invention
This device one moisture capacity of iron ore powders determinator is made up of electronic balance I 1, electronic balance II 2, fixed platform 3, traverser 4, coupon 5, beaker 6, mark post 7 and proximity switch 8, traverser 4 is placed in below fixed platform 3 40-50cm place and parallel with fixed platform 3, traverser 4 is provided with proximity switch 8 and through hole 10, and through hole 10 is within proximity switch 8 induction range；Fixed platform 3 is connected with mark post 7 upper end, and mark post 7 lower end passes perpendicularly through the through hole 10 being located in traverser 4, and through hole 10 and mark post 7 are matched in clearance, and traverser 4 can be moved up and down along mark post 7 by motor or hydraulic-driven, and mark post 7 is provided with the sensing ferrum 9 of activity；Electronic balance I 1 is placed in fixed platform 3, and electronic balance II 2 is placed in traverser 4；Having hole 15 in fixed platform 3, the length of side of hole 15, less than the electronic balance I 1 arbitrary length of side of lower surface, is provided with hook 14, the hole 15 in hook 14 traverse fixed platform 3 bottom electronic balance I 1；Beaker 6 is placed on electronic balance II 2；Coupon 5 is through pipe, caliber two ends, top symmetry has two eyelets 16, eyelet 16 is positioned on the sidewall of coupon 5, and along 10 ± 0.2mm on eyelet 16 centre distance coupon 5, coupon 5 is hung on the hook 14 bottom electronic balance I 1 by the lanyard 13 through two eyelets 16；Coupon 5 lower end is fixed with the screen cloth 11 of 160～250 orders, and the screen cloth face within coupon 5 that is positioned at is equipped with the filter paper 12 matched with coupon 5 internal diameter.
Illustrate to utilize said apparatus to carry out moisture capacity of iron ore powders method for measuring step below by way of four specific embodiments:
Embodiment 1:
nullThe first step，Dry and weigh: for South Africa powder，South Africa powder is weighed 1kg，It is that 105 DEG C of baking ovens dry 2 hours in temperature，Use 10mm after drying、5mm、3mm、Iron Ore Powder screening is 5 grades by the circular hole standard screen of 1mm，Particle diameter is designated as Φ 1 respectively、Φ2、Φ3、Φ4、Φ5，Then Φ 1 >=10mm，5mm≤Φ 2 10mm，3mm≤Φ 3 5mm，1mm≤Φ 4 3mm，Φ 5 1mm，Weigh the weight of each grade Iron Ore Powder respectively，Calculate each grade to account for the percentage by weight of weighed amount material gross weight and be respectively as follows: the Iron Ore Powder of Φ 1 particle diameter and account for 3.35%、The Iron Ore Powder of Φ 2 particle diameter accounts for 45.19%、The Iron Ore Powder of Φ 3 particle diameter accounts for 26.96%、The Iron Ore Powder of Φ 4 particle diameter accounts for 15.59%、The Iron Ore Powder of Φ 5 particle diameter accounts for 4.91%，Shared by each grade, percentage by weight weighs Iron Ore Powder 100g，It is designated as Mi(unit: gram)，And fully mix.
Second step, demarcates: demarcating the water yield in beaker under not loading South Africa powdery state, demarcating steps is as follows:
A, first with lanyard 13, coupon 5 is hung on the hook 14 of electronic balance I 1, sensing ferrum 9 on mark post 7 is moved to mark post top, traverser 4 is down to lowest point, beaker 6 is placed on electronic balance II 2 and reading is reset, coupon 5 centrage is made to overlap with beaker 6 centrage, now not yet enter bottom coupon 5 in beaker 6,100ml water is added in beaker 6, open motor and make the vertical slowly rising of traverser 4, motor is closed as bottom surface, coupon 5 lower end immersion underwater 1mm, keeping 3s, now filter paper 12 absorbs water fully saturated；
B, unlatching motor slowly decline traverser 4, make coupon 5 bottom surface leave beaker 6 water surface, stop when coupon 5 bottom surface moves to beaker 6 scale 170ml declining, lower sensing ferrum 9 to traverser circular hole 10 place on mark post 7, after electronic balance I 1 stable reading, reading is reset；
C, add water in beaker 6 until the water surface from coupon 5 bottom surface 1mm time, dropper is adopted to continue to drip in beaker 6, when in beaker the water surface with when just contacting bottom coupon 5, coupon 5 at vertical direction by the downward component of interfacial tension and buoyancy upwards, now, the downward component of interfacial tension is more than buoyancy, and electronic balance I 1 reading is more than zero；Continue to add water to drop in beaker 6, coupon 5 is gradually increased at buoyancy suffered by vertical direction, when buoyancy suffered by the downward component of interfacial tension and coupon reaches to balance, the reading of electronic balance I 1 is zero, the water yield that now in beaker 6, namely the weight of water demarcate, it is that 170.3g is designated as W water that this embodiment demarcates the water yield.
3rd step, charging: after demarcating the water yield, fall traverser 4 and make coupon 5 leave the water surface in beaker 6；In coupon 5, add load weighted 100g breeze so that it is natural packing, hang over after installing and electronic balance I 1 hook 14 below weighs, after record gross weight, balance is reset.
4th step, measure: open motor and promote traverser 4, when proximity switch 8 senses the sensing ferrum 9 on mark post 7, motor power automatically cuts off, traverser 4 is out of service, this position is the position demarcating the beaker water yield, now coupon 5 bottom surface has leached into the water surface, the reading of electronic balance I 1 quickly transfers zero to, start timing, the reading of every 5 seconds record primary electron balances I 1, drip in beaker 6 with dropper simultaneously, the weight of water in beaker 6 is made to remain 170.3g, when electronic balance I 1 and the double error of the respective reading of electronic balance II 2 are less than 0.05g, the reading of electronic balance I 1 is 10.32g, it is South Africa powder saturated water adsorptive value, it is designated as Mw.
5th step, verification: when South Africa powder reaches capacity water absorption, traverser 4 fallen by unlatching motor makes coupon 5 leave the water surface, the reading of electronic balance II 2 is still 170.3g, the reading of electronic balance I 1 is still 10.32g, the component that when illustrating to test, interfacial tension is downward reaches balance with suffered buoyancy, demarcates successfully.
6th step, takes out the South Africa powder after test and filter paper 12, coupon 5 is rinsed well, and blowing is dry, puts into new filter paper, and after soaking filter paper, repetition the 3rd step, the 4th step are tested next time.The second time of South Africa powder and third time saturated water adsorptive value respectively 10.12g, 10.28g, the saturation time simultaneously recorded is all 25s.
7th step, calculates moisture capacity of iron ore powders, according to formula: Mc=(Mw/Mi) × 100% calculates,
In formula, the wet volume capacity (unit: %) of Mc-breeze
MWThe saturated water adsorptive value of-breeze (unit: gram)
The quality of Mi-breeze drying regime (unit: gram)
Mc1=(10.32/100) × 100%=10.32%
Mc2=(10.12/100) × 100%=10.12%
Mc3=(10.28/100) × 100%=10.28%
By three result of the test average out to 10.24%, namely the wet volume capacity value of South Africa powder is 10.24%.
Embodiment 2:
Test procedure is identical with embodiment 1, and test parameters selects and result is shown in following table:
Embodiment 3:
Test procedure is identical with embodiment 1, and test parameters selects and result is shown in following table:
Embodiment 4:
Test procedure is identical with embodiment 1, and test parameters selects and result is shown in following table:
Moisture capacity of iron ore powders determinator of the present invention and method, simple to operate, device sensitivity is high, error is little, greatly improve the accuracy that wet volume capacity measures, avoid the generation of personal error, for improving sintering granulating effect, determining that the Reasonable water yield provides technical support, can be widely popularized in the mensuration field of all mineral wet volume capacitys.
Claims (5)
- null1. one kind utilizes moisture capacity of iron ore powders determinator to carry out moisture capacity of iron ore powders method for measuring，Described moisture capacity of iron ore powders determinator constitutes the electronic balance I (1) including being placed in fixed platform (3)、It is placed in the electronic balance II (2) in traverser (4)、Be parallel to each other the fixed platform (3) and traverser (4) placed、Through coupon (5)、It is placed in the beaker (6) on electronic balance II (2)、Mark post (7) and the limit switch (8) being located in traverser (4)，Traverser (4) is placed in fixed platform (3) lower section，Mark post (7) upper end is connected with fixed platform (3)，Lower end passes perpendicularly through the through hole (10) in traverser (4)，Through hole (10) and mark post (7) are matched in clearance，Mark post (7) is provided with the sensing ferrum (9) of activity，Coupon (5) hangs on the hook (14) of electronic balance I (1) bottom，Hole (15) on hook (14) traverse fixed platform (3)；Coupon (5) lower end is fixed with screen cloth (11), screen cloth face laying filter paper (12) that coupon (5) is internal,It is characterized in that: carry out as follows:The first step, dry and weigh: taking the fully dried 0.5-15mm grade circular hole standard screen screening of the Iron Ore Powder being not less than 1kg weight is 3～10 grades, calculate the percentage by weight of Iron Ore Powder gross weight shared by each grade, percentage by weight shared by each grade weighs the Iron Ore Powder that gross weight is (100～200g) ± 0.1g, it is designated as Mi(unit: gram), and fully mix；Second step, demarcates: demarcating the water yield in beaker (6) under not loading Iron Ore Powder state, demarcating steps is as follows:A, first with lanyard (13), coupon (5) is hung on the hook (14) of electronic balance I (1), sensing ferrum (9) on mark post (7) is moved to mark post (7) top, traverser (4) is down to lowest point, beaker (6) is placed on the upper clearing of electronic balance II (2), coupon (5) centrage is made to overlap with beaker (6) centrage, the water of 1/5～1/4 beaker capacity is added in beaker (6), rising traverser (4), stop as coupon (5) bottom surface, lower end immersion underwater 1-2mm rising, keep 3-5s, filter paper (12) is made to absorb water fully saturated；B, decline traverser, coupon (5) bottom surface is made to leave beaker (6) water surface, stop when coupon (5) bottom surface moves between beaker (6) capacity 1/3～1/2 scale declining, lower the sensing ferrum (9) on mark post (7) to traverser through hole (10) place, after electronic balance I (1) stable reading, reading is reset；C, adding water in beaker (6) until when the water surface is from coupon (5) bottom surface 1～2mm, adopting dropper to drip in beaker (6), when just contacting bottom the water surface and coupon (5) in beaker (6), electronic balance I (1) reading is more than zero；Continue to add water to beaker (6) interior drop, when the reading of electronic balance I (1) is zero, the water yield that now in beaker (6), namely the weight of water demarcate, it is designated as WWater(unit: gram)；3rd step, charging: fall traverser (4) and make coupon (5) leave the water surface in beaker (6)；In coupon (5), add load weighted (100～200g) ± 0.1g breeze so that it is natural packing, hang over the upper weighing of hook (14) after installing, after record gross weight, electronic balance I is reset；4th step, measure: promote traverser (4), when proximity switch (8) senses sensing ferrum (9) on mark post (7), traverser (4) is out of service, the reading of electronic balance I (1) quickly transfers zero to, start timing, the reading of every 1～10 second identical interval record primary electron balance I (1), drips in beaker (6) simultaneously, makes the weight of water in beaker (6) remain WWater, when electronic balance I (1) and electronic balance II (2) the double error of respective reading are less than 0.05g, the reading of electronic balance I (1) is saturated water adsorptive value, is designated as Mw(unit: gram)；5th step, verification: when breeze reaches capacity water absorption, falling traverser (4) and make coupon (5) leave the water surface, the reading of electronic balance II (2) is still WWaterThe reading of electronic balance I (1) is still Mw, the component that when illustrating to test, interfacial tension is downward reaches balance with suffered buoyancy, demarcate successfully, test data is accurate, when coupon (5) leaves the absolute difference of electronic balance II (2) reading before and after the water surface more than 0.5, it is necessary to re-calibrate demarcation water yield WWater；6th step, Iron Ore Powder after test and filter paper (12) are taken out, coupon (5) is rinsed well and after drying, put into new filter paper (12), after soaking filter paper, repeat the 3rd step, the 4th step is tested next time, it is ensured that every kind of breeze duplicate detection three times, finally takes the meansigma methods of its Iron Ore Powder saturated water adsorptive value；7th step, calculates moisture capacity of iron ore powders, according to formula: Mc=(Mw/Mi) × 100% calculates, by the wet volume capacity value of three result of the tests on average i.e. this Iron Ore Powder；In formula, the wet volume capacity of Mc-breeze, unit: %；MWThe saturated water adsorptive value of-breeze, unit: gram；MiThe quality of-breeze drying regime, unit: gram.
- 2. the assay method of moisture capacity of iron ore powders according to claim 1, it is characterised in that: the drying mode of described first step Iron Ore Powder is oven drying, and oven temperature is 105 ± 10 DEG C, 2-3 hour drying time.
- 3. the assay method of moisture capacity of iron ore powders according to claim 1 and 2, it is characterised in that: described traverser (4) is placed in 40～50cm place, fixed platform (3) lower section, vertically moves along mark post (7), and type of drive is that motor drives or hydraulic-driven.
- 4. the assay method of moisture capacity of iron ore powders according to claim 1 and 2, it is characterised in that: the described screen cloth (11) being fixed on coupon (5) lower end is 160～250 eye mesh screens；The internal diameter that the described filter paper (12) being layed on the screen cloth that coupon (5) is internal is circle, diameter and coupon (5) matches.
- 5. the assay method of moisture capacity of iron ore powders according to claim 1 and 2, it is characterized in that: in described coupon (5) upper portion side wall, symmetry has two eyelets (16), coupon (5) is hung on the hook (14) bottom electronic balance I by the lanyard (13) through two eyelets (16).
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| CN105716989B (en) * | 2016-04-12 | 2018-10-09 | 武汉科技大学 | The measurement device and its assay method of porous accumulation bed water holding and Permeable characteristic |
| CN107764693B (en) * | 2017-11-16 | 2020-01-31 | 武汉钢铁有限公司 | method for accurately measuring maximum molecular water content of iron ore powder |
| CN108871998B (en) * | 2018-03-28 | 2021-04-02 | 湖北葛店人福药用辅料有限责任公司 | Method and device for detecting water absorption performance of powder |
| CN109182737B (en) * | 2018-10-31 | 2020-04-14 | 东北大学 | Characterization method of powder characteristics in iron ore powder pelletizing process and application of characterization method in iron ore pellets |
| CN110274843A (en) * | 2019-08-07 | 2019-09-24 | 攀钢集团重庆钛业有限公司 | The detection method of titanium dioxide water absorption |
| CN114252367A (en) * | 2021-12-14 | 2022-03-29 | 陕西龙门钢铁有限责任公司 | Iron ore powder hydrophilicity detection method |
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