CN104215543A - Iron ore powder wet compacted weight determining device and iron ore powder wet compacted weight determining method - Google Patents
Iron ore powder wet compacted weight determining device and iron ore powder wet compacted weight determining method Download PDFInfo
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Abstract
The invention relates to an iron ore powder wet compacted weight determining device and an iron ore powder wet compacted weight determining method, belonging to the technical field of metallurgy test and solving the technical problems that the wet compacted weight of the iron ore powder cannot be accurately determined in the prior art. According to the technical scheme, the iron ore powder wet compacted weight determining device comprises an electronic balance I, an electronic balance II, a fixed platform, a movable platform, a test sample tube, a beaker, a marker post and an approaching switch, wherein the electronic balance I and the electronic balance II are respectively arranged on the fixed platform and the movable platform, the movable platform is arranged below the fixed platform, the movable platform is provided with the approaching switch and a through hole, the marker post which perpendicularly runs through the fixed platform and the through hole of the movable platform is provided with slide sensing iron, the test sample tube which runs through from top to bottom is suspended below the electronic balance I, and a sieve screen on which filter paper is spread is arranged on the lower end of the test sample tube in a sealing manner; in the determination of the wet compacted weight of the iron ore powder, the iron ore powder saturated water absorption quantity test is carried out according to the interface tension and floating force balance principle of water, and a precise wet compacted weight value can be calculated. The iron ore powder wet compacted weight determining device is simple to install and operate, high in sensitivity and capable of remarkably improving the determination accuracy of the wet compacted weight.
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 mixed and have certain particle size composition bead, because Iron Ore Powder, flux and fuel are in the process of following cylindrical mixer upset, under the effect of water, the particle of particle diameter <0.2mm can stick to above the particle of particle diameter >0.7mm, therefore, except the intrinsic granularmetric composition of raw material is on except after batch mixing, size-grade 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 to optimization sintering process and has great significance.The mensuration of wet volume capacity needs the height of the container immersed in liquid level filling breeze to be usually less 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 larger.
Summary of the invention
The invention provides 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, effectively can solving the technical matters that moisture capacity of iron ore powders in prior art is difficult to Accurate Measurement, providing scientific basis for improving sintering granulating effect.
The technical scheme solved the problems of the technologies described above is:
A kind of moisture capacity of iron ore powders determinator, formation comprises the electronic balance I be placed in stationary platform, the electronic balance II be placed in movable platform, be parallel to each other the stationary platform and movable platform, through coupon, the beaker be placed on electronic balance II, mark post and the limit switch be located in movable platform of placing, movable platform is placed in below stationary platform, mark post upper end is connected with stationary platform, lower end passes perpendicularly through the through hole in movable platform, through hole and mark post are clearance fit, and mark post is provided with movable induction iron; Coupon hangs on the hook bottom electronic balance I, links up with through the hole in stationary platform; Coupon lower end is fixed with screen cloth, and filter paper is laid in the screen cloth face of coupon inside.
Above-mentioned moisture capacity of iron ore powders determinator, described movable platform is placed in 40 ~ 50cm place below stationary platform, and along mark post vertically movement, 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; Filter paper on the described screen cloth being layed in coupon inside is for circular, and the internal diameter of diameter and coupon matches.
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 the hook bottom electronic balance I through the lanyard of two eyelets.
One utilizes said apparatus to carry out moisture capacity of iron ore powders method for measuring, carries out as follows:
The first step, drying and weighing: getting fully dry rear the screening with 0.5-15mm grade circular hole standard sieve 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, the Iron Ore Powder that gross weight is (100 ~ 200g) ± 0.1g is taken according to percentage by weight shared by each grade, be designated as Mi(unit: gram), and fully mix.
Second step, demarcate: do not loading the water yield of to demarcate under Iron Ore Powder state in beaker, demarcating steps is as follows:
A, first with lanyard, coupon is hung on the hook of electronic balance I, induction iron on mark post is moved to mark post top, movable platform is down to lowest part, beaker is placed on electronic balance II and resets, and coupon center line is overlapped with beaker center line, adds the water of 1/5 ~ 1/4 beaker capacity in beaker, rising movable platform, stop as bottom surface, coupon lower end immersion underwater 1-2mm rising, keep 3-5s, filter paper is absorbed water completely saturated;
B, decline movable platform, coupon bottom surface is made to leave the beaker water surface, stop when coupon bottom surface moves between beaker capacity 1/3 ~ 1/2 scale declining, reading, to movable platform through hole, resets by the induction iron on downward mark post after electronic balance I stable reading;
C, add water in beaker until the water surface apart from coupon bottom surface 1 ~ 2mm time, adopt dropper drip in beaker, when the water surface in beaker is with when just contacting bottom coupon, electronic balance I reading is greater than zero; Continue to add water to drop in beaker, when the reading of electronic balance I is zero, the water yield that namely weight of now burning water in the cup demarcate, is designated as W
water(unit: gram).
3rd step, charging: fall movable platform and make coupon leave the water surface in beaker; In coupon, add load weighted (100 ~ 200g) ± 0.1g breeze, make its natural packing, hang over the upper weighing of hook after installing, after record general assembly (TW), balance is reset.
4th step, measure: promote movable platform, when sensing the induction iron on mark post when proximity switch, movable platform is out of service, the reading of electronic balance I transfers zero to fast, start timing, the reading of every 1 ~ 10 second identical time interval record primary electron balance I, drips simultaneously, makes the weight of burning water in the cup remain W in beaker
water, when electronic balance I and the respective double error of reading of electronic balance II are no more 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 absorbing capacity, fall movable platform and make coupon leave the water surface, the reading of electronic balance II is still w
water, the reading of electronic balance I is still Mw, and when test is described, the downward component of interfacial tension and suffered buoyancy reach balance, demarcate successfully, test figure is accurate, if the absolute difference of electronic balance II reading that coupon leaves before and after the water surface is greater than 0.5, needs again to correct and demarcates water yield w
water.
6th step, takes out the Iron Ore Powder after test and filter paper, after coupon is rinsed well also drying, put into new filter paper, after soaking filter paper, repetition the 3rd step, the 4th step are tested next time, guarantee often kind of breeze duplicate detection three times, finally get the mean value 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 average i.e. this Iron Ore Powder of three test findings.
In formula, the wet volume capacity (unit: %) of Mc-breeze;
M
wthe saturated water adsorptive value of-breeze (unit: gram);
M
ithe 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, drying time 2-3 hour.
Apparatus of the present invention install, simple to operate, highly sensitive, this device is adopted to carry out the mensuration of moisture capacity of iron ore powders according to the interfacial tension of water and buoyant equilibrium principle, the method of weight is used to define interfacial tension and the buoyant equilibrium of water, greatly can 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, extensively can promote 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 movable platform schematic diagram of the present invention.
In figure, mark is as follows: 1-electronic balance I, 2-electronic balance II, 3-stationary platform, 4-movable platform,
5-coupon, 6-beaker, 7-mark post, 8-proximity switch, 9-induction iron, 10-through hole, 11-screen cloth, 12-filter paper, 13-lanyard, 14-hook, 15-hole, 16-eyelet.
Embodiment
A kind of moisture capacity of iron ore powders determinator of this device is made up of electronic balance I 1, electronic balance II 2, stationary platform 3, movable platform 4, coupon 5, beaker 6, mark post 7 and proximity switch 8, movable platform 4 is placed in 40-50cm place below stationary platform 3 and parallel with stationary platform 3, movable platform 4 is provided with proximity switch 8 and through hole 10, and through hole 10 is within proximity switch 8 induction range; Stationary platform 3 is connected with mark post 7 upper end, mark post 7 lower end passes perpendicularly through the through hole 10 be located in movable platform 4, through hole 10 and mark post 7 are clearance fit, and movable platform 4 can be moved up and down along mark post 7 by motor or hydraulic-driven, and mark post 7 is provided with movable induction iron 9; Electronic balance I 1 is placed in stationary platform 3, and electronic balance II 2 is placed in movable platform 4; Stationary platform 3 has hole 15, the length of side of hole 15 is less than the arbitrary length of side of electronic balance I 1 lower surface, is provided with hook 14 bottom electronic balance I 1, and hook 14 is through the hole 15 in stationary platform 3; 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 hangs on the hook 14 bottom electronic balance I 1 by the lanyard 13 through two eyelets 16; Coupon 5 lower end is fixed with 160 ~ 250 object screen clothes 11, and the screen cloth face being positioned at coupon 5 inside is equipped with the filter paper 12 matched with coupon 5 internal diameter.
Illustrating below by way of four specific embodiments utilizes said apparatus to carry out moisture capacity of iron ore powders method for measuring step:
Embodiment 1:
The first step, drying and weighing: for South Africa powder, South Africa powder is weighed 1kg, it is in 105 DEG C of baking ovens dry 2 hours in temperature, dry rear 10mm, 5mm, 3mm, Iron Ore Powder screening is 5 grades by the circular hole standard sieve of 1mm, particle diameter is designated as Φ 1 respectively, Φ 2, Φ 3, Φ 4, Φ 5, 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 the percentage by weight that each grade accounts for weighed material gross weight to be respectively: the Iron Ore Powder of Φ 1 particle diameter accounts 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%, Iron Ore Powder 100g is weighed according to percentage by weight shared by each grade, be designated as Mi(unit: gram), and fully mix.
Second step, demarcate: do not loading the water yield of to demarcate under the powdery state of South Africa in beaker, demarcating steps is as follows:
A, first with lanyard 13, coupon 5 is hung on the hook 14 of electronic balance I 1, induction iron 9 on mark post 7 is moved to mark post top, movable platform 4 is down to lowest part, beaker 6 is placed on electronic balance II 2 and reading is reset, coupon 5 center line is overlapped with beaker 6 center line, 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 movable platform 4, the disable motor as bottom surface, coupon 5 lower end immersion underwater 1mm, keep 3s, now filter paper 12 absorbs water completely saturated;
B, unlatching motor slowly decline movable platform 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 induction iron 9 to movable platform 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 apart from coupon 5 bottom surface 1mm time, dropper is adopted to continue to drip in beaker 6, when the water surface in beaker is 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 greater than buoyancy, and electronic balance I 1 reading is greater than zero; Continue to add water to drop in beaker 6, coupon 5 buoyancy suffered by vertical direction increases gradually, when suffered by the downward component of interfacial tension and coupon, buoyancy reaches 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: demarcate after the water yield, falls movable platform 4 and makes coupon 5 leave the water surface in beaker 6; In coupon 5, add load weighted 100g breeze, make its natural packing, hang over after installing on the hook 14 below electronic balance I 1 and weigh, after record general assembly (TW), balance is reset.
4th step, measure: open motor and promote movable platform 4, when sensing the induction iron 9 on mark post 7 when proximity switch 8, motor power cuts off automatically, movable platform 4 is out of service, this position is the position demarcating the beaker water yield, now the water surface is immersed in coupon 5 bottom surface, the reading of electronic balance I 1 transfers zero to fast, 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 respective double error of reading of electronic balance II 2 are no more than 0.05g, the reading of electronic balance I 1 is 10.32g, be South Africa powder saturated water adsorptive value, be designated as Mw.
5th step, verification: when South Africa powder reaches capacity water absorbing capacity, movable platform 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, when test is described, the downward component of interfacial tension and suffered buoyancy reach balance, demarcate 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 is respectively 10.12g, 10.28g with third time saturated water adsorptive value, and 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
M
wthe 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 test findings 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 is selected and be the results are shown in following table:
Embodiment 3:
Test procedure is identical with embodiment 1, and test parameters is selected and be the results are shown in following table:
Embodiment 4:
Test procedure is identical with embodiment 1, and test parameters is selected and be the results are 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, the accuracy that very big raising wet volume capacity measures, avoid the generation of personal error, for improving sintering granulating effect, determining that the Reasonable water yield provides technical support, extensively can promote in the mensuration field of all mineral wet volume capacitys.
Claims (6)
1. a moisture capacity of iron ore powders determinator, it is characterized in that: formation comprises the electronic balance I (1) be placed in stationary platform (3), be placed in the electronic balance II (2) in movable platform (4), be parallel to each other the stationary platform (3) and movable platform (4) of placing, through coupon (5), be placed in the beaker (6) on electronic balance II (2), mark post (7) and the limit switch (8) be located in movable platform (4), movable platform (4) is placed in stationary platform (3) below, mark post (7) upper end is connected with stationary platform (3), lower end passes perpendicularly through the through hole (10) in movable platform (4), through hole (10) and mark post (7) are clearance fit, mark post (7) is provided with movable induction iron (9), coupon (5) hangs on the hook (14) of electronic balance I (1) bottom, hook (14) is through the hole (15) in stationary platform (3), coupon (5) lower end is fixed with screen cloth (11), screen cloth face laying filter paper (12) that coupon (5) is inner.
2. moisture capacity of iron ore powders determinator according to claim 1, is characterized in that: described movable platform (4) is placed in 40 ~ 50cm place, stationary platform (3) below, and along mark post (7) vertically movement, type of drive is that motor drives or hydraulic-driven.
3. moisture capacity of iron ore powders determinator according to claim 1 and 2, is characterized in that: the described screen cloth (11) being fixed on coupon (5) lower end is 160 ~ 250 eye mesh screens; The described filter paper (12) be layed on the inner screen cloth of coupon (5) is circle, and the internal diameter of diameter and coupon (5) matches.
4. moisture capacity of iron ore powders determinator 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).
5. utilize the device according to any one of claim 1 ~ 4 to carry out a moisture capacity of iron ore powders method for measuring, it is characterized in that: carry out as follows:
The first step, drying and weighing: getting fully dry rear the screening with 0.5-15mm grade circular hole standard sieve 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, the Iron Ore Powder that gross weight is (100 ~ 200g) ± 0.1g is taken according to percentage by weight shared by each grade, be designated as Mi(unit: gram), and fully mix;
Second step, demarcate: do not loading the water yield of to demarcate under Iron Ore Powder state in beaker (6), demarcating steps is as follows:
A, first lanyard (13) is used to hang on the hook (14) of electronic balance I (1) by coupon (5), induction iron (9) on mark post (7) is moved to mark post (7) top, movable platform (4) is down to lowest part, beaker (6) is placed on the upper clearing of electronic balance II (2), coupon (5) center line is overlapped with beaker (6) center line, the water of 1/5 ~ 1/4 beaker capacity is added in beaker (6), rising movable platform (4), stop as coupon (5) bottom surface, lower end immersion underwater 1-2mm rising, keep 3-5s, filter paper (12) is absorbed water completely saturated,
B, decline movable platform, 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, reading, to movable platform through hole (10) place, resets by the induction iron (9) in downward mark post (7) after electronic balance I (1) stable reading;
C, add water in beaker (6) until when the water surface is apart from coupon (5) bottom surface 1 ~ 2mm, adopt dropper to drip in beaker (6), the water surface is with when just contacting bottom coupon (5) in the beaker (6), and electronic balance I (1) reading is greater 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, is designated as W
water(unit: gram);
3rd step, charging: fall movable platform (4) and make coupon (5) leave the water surface in beaker (6); In coupon (5), add load weighted (100 ~ 200g) ± 0.1g breeze, make its natural packing, hang over the upper weighing of hook (14) after installing, after record general assembly (TW), balance is reset;
4th step, measure: promote movable platform (4), when sensing induction iron (9) on mark post (7) when proximity switch (8), movable platform (4) is out of service, the reading of electronic balance I (1) transfers zero to fast, start timing, the reading of every 1 ~ 10 second identical time interval record primary electron balance I (1), drips simultaneously, makes the weight of water in beaker (6) remain W in beaker (6)
water, when electronic balance I (1) and the respective double error of reading of electronic balance II (2) are no more 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 absorbing capacity, fall movable platform (4) and make coupon (5) leave the water surface, the reading of electronic balance II (2) is still w
waterthe reading of electronic balance I (1) is still Mw, when test is described, the downward component of interfacial tension and suffered buoyancy reach balance, demarcate successfully, test figure is accurate, the absolute difference of electronic balance II (2) reading left before and after the water surface when coupon (5) is greater than 0.5, needs again to correct to demarcate water yield w
water;
6th step, Iron Ore Powder after test and filter paper (12) are taken out, after coupon (5) is rinsed well also drying, put into new filter paper (12), after soaking filter paper, repeat the 3rd step, the 4th step is tested next time, guarantee often kind of breeze duplicate detection three times, finally get the mean value 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 average i.e. this Iron Ore Powder of three test findings;
In formula, the wet volume capacity (unit: %) of Mc-breeze;
M
wthe saturated water adsorptive value of-breeze (unit: gram);
M
ithe quality of-breeze drying regime (unit: gram).
6. the assay method of moisture capacity of iron ore powders according to claim 5, is characterized in that: the drying mode of described first step Iron Ore Powder is oven drying, and oven temperature is 105 ± 10 DEG C, drying time 2-3 hour.
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| CN105716989A (en) * | 2016-04-12 | 2016-06-29 | 武汉科技大学 | Device and method for determining water retention and permeation characteristics of porous packed bed layer |
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| CN109182737A (en) * | 2018-10-31 | 2019-01-11 | 东北大学 | A kind of characterizing method of Iron Ore Powder pelletizing process powder characteristics and its application 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 |
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| 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 |
| CN108871998A (en) * | 2018-03-28 | 2018-11-23 | 湖北葛店人福药用辅料有限责任公司 | Powder water absorbing properties detection method and device |
| CN109182737A (en) * | 2018-10-31 | 2019-01-11 | 东北大学 | A kind of characterizing method of Iron Ore Powder pelletizing process powder characteristics and its application 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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