CN102768159A - Device and method for detecting reducibility of iron ore - Google Patents
Device and method for detecting reducibility of iron ore Download PDFInfo
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- CN102768159A CN102768159A CN2012102473814A CN201210247381A CN102768159A CN 102768159 A CN102768159 A CN 102768159A CN 2012102473814 A CN2012102473814 A CN 2012102473814A CN 201210247381 A CN201210247381 A CN 201210247381A CN 102768159 A CN102768159 A CN 102768159A
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Abstract
The invention provides a device and a method for detecting reducibility of iron ore. The device comprises an air supply system, a thermogravimetric scale, a tail gas treatment system, a temperature control system, a gas control system and a compute data processing system. In the test process, a test sample 5 is placed in a crucible; a contrastive empty crucible is placed at the other end, and temperature is raised according to a predetermined temperature raising system. The method comprises the following steps: detecting by using a differential thermal scale device mainly based on a thermogravimetry theory; collecting temperature data and quality data in real time in the reaction process; and recording a thermogravimetric curve in the test where weight changes along with the temperature. The device provided by the invention is convenient to operate, small in volume and good in safety because harmful gases produced in the reduction process are discharged after being treated by the tail gas treatment system.
Description
Technical field
The present invention relates to a kind of device and a kind of method of iron ore test, the apparatus and method that a kind of reducibility of iron ore of more specifically saying so is measured.
Background technology
Reducing property is represented from iron ore, to get rid of the complexity that combines oxygen with iron with reductive agent.The calculating of reduction degree is to be that benchmark (supposes that promptly iron in the iron ore is all with Fe with the ferric iron state
2O
3Form exist, and these Fe
2O
3In oxygen can be regarded as 100%), the deoxidation degree that reduction is reached behind the certain hour is represented with mass percent.Reducibility of iron ore adopts GB GB/T13241-91 " the reductibility assay method of iron ore " method research usually.Experimental implementation is complicated, and the amount of iron ores that needs is many, and the influence of process of the test human factor is bigger.
CN201464316 discloses a kind of novel reducibility of iron ore test unit; This device is directed against present reducibility of iron ore test unit when finishing determination test; After need removing weighing device, take out reduction tube in the furnace chamber again after, add iron ore powder or change the problem of iron ore powder.The technical scheme that adopts: a kind of reducibility of iron ore test unit, it comprises body of heater, and reduction tube, weighing device and control device, said reduction tube are in the furnace chamber of reduction furnace, and said reduction tube is suspended on below the weighing device; Said reduction tube is provided with reducing gas inlet and reducing gas outlet, is provided with thermopair in the said reduction tube; It also comprises elevating mechanism, and said elevating mechanism comprises elevating lever and crane, and said elevating lever comprises carriage release lever and fixed bar, and said carriage release lever and crane are fixed, and said elevating mechanism is also fixed with weighing device.
CN101545842 discloses a kind of test unit of measuring reducibility of iron ore, and it comprises body of heater, reduction tube, weighing device and control device, is provided with furnace chamber in the body of heater, and reduction tube is in the furnace chamber of reduction furnace, and reduction tube is suspended on below the weighing device; Reduction tube is provided with reducing gas inlet and reducing gas outlet, is provided with thermopair in the reduction tube; It also comprises gas outlet, and the reducing gas exit is provided with gas skirt, and gas outlet is connected with gas skirt, is provided with lighter in the gas skirt, and gas outlet is provided with blower fan, and lighter is connected with the control device signal.As improvement, it also comprises elevating mechanism, and the up-down of said mechanism comprises carriage release lever and fixed bar, and carriage release lever and crane are fixed, and crane and weighing device are fixed; Gas skirt or removable be connected rotatable with body of heater.
Summary of the invention
All utilize GB GB/T13241-91 method research reducibility of iron ore to prior art; Process of the test is complicated, needs amount of iron ores many, and process of the test produces the more deficiency that waits of harmful gas; The apparatus and method that the present invention provides a kind of reducibility of iron ore to measure; That this device is arranged is compact, simple to operate, be easy to grasp, and tests required sample and the desired gas amount is far smaller than GB GB/T13241-91.
The present invention provides a kind of Iron Ore Powder reductibility determinator, comprises air supply system, thermobalance, and exhaust treatment system, temperature control system, gas control system and computer data processing system, said air supply system comprises gas cylinder, air valve, gas cleaning unit; Said thermobalance comprises thermobalance, crucible, test specimen, and empty crucible is used in contrast; Said exhaust treatment system is connected with thermobalance, in order to the harmful gas that produces in the Processing Test; Temperature control system is connected with thermobalance with gas control system one end, the computer data processing system of other end connection processing test figure.
Further; Said thermobalance two ends are placed the crucible that the iron ore test specimen is housed respectively and are used empty crucible with contrast; Gas in the gas cylinder in the air supply system is removed the moisture in the gas through the gas cleaning unit that anhydrous silica gel is housed again through behind the air valve, gets in the thermobalance through the gas that purifies; Exhaust treatment system is equipped with in the thermobalance exit, and thermobalance is connected with temperature control system and gas control system.
Further, said crucible internal diameter 4～6mm, high 1～6mm, material is 98wt%Al
2O
3
The present invention also provides a kind of Iron Ore Powder reductibility assay method, and its step is following:
1) get 100～200g iron ore sample, granularity is 10～12.5mm, under 105 ℃ of temperature, dries 120min, to remove moisture;
The Iron Ore Powder of 2) getting after a certain amount of oven dry is crushed to below 200 orders with the enclosure-type sampling machine;
3) take by weighing broken good test specimen 50 ± 1mg and put into crucible; The crucible that test specimen is housed is put on the thermobalance, heated up, be warming up to 900 ℃, logical N in this process by 10～30 ℃/min heating rate
2Protection;
4) behind 900 ℃ of insulation 30min, feed reducing gas CO, wherein the reducing gas flow is 15mL/min, reaction time 180min; After the off-test, logical N
2Be cooled to room temperature;
5) utilize thermogravimetric curve to combine FeO content and TFe cubage in the iron ore to go out the reduction degree of iron ore;
6) take by weighing the Iron Ore Powder of same weight again, repeat above-mentioned steps 2～3 times, calculate the mean value of its reduction of iron ore degree, and with its mean value as reduction of iron ore degree index.
The invention has the beneficial effects as follows this invention determinator have arrange compact, simple to operate, be easy to grasp, test required sample and the desired gas amount is far smaller than GB GB/T13241-91.Thereby and add exhaust treatment system in the test unit and can not discharge a large amount of harmful gases to the external world, security is good.Test findings and GB GB/T13241-91 have good consistance.Can be adaptable across industrial and mining enterprises, colleges and universities and scientific research institution.
Description of drawings
Fig. 1 is a reducibility of iron ore assay device structures synoptic diagram of the present invention;
Among the figure: the 1-gas cylinder, the 2-air valve, the 3-gas cleaning unit, the 4-thermobalance, the 5-crucible, 6-iron ore sample, the 7-contrast is used empty crucible, 8-exhaust treatment system, 9-temperature control system, 10-gas control system, 11-computer data processing system.
Embodiment
Iron Ore Powder reductibility determinator as shown in Figure 1 comprises air supply system, thermobalance, and exhaust treatment system, temperature control system, gas control system, computer data processing system, wherein said air supply system comprises gas cylinder 1, air valve 2, gas cleaning unit 3; Said thermobalance comprises thermobalance 4, crucible 5, test specimen 6, and contrast is with empty crucible 7; Said exhaust treatment system 8 is connected with thermobalance, in order to the harmful gas that produces in the Processing Test; Temperature control system 9 is connected with thermobalance with gas control system 10 1 ends, in order to temperature and the atmosphere under the different phase in the control process of the test, the computer data processing system 11 of other end connection processing test figure.Thermobalance 4 two ends are placed the crucible 5 that iron ore test specimen 6 is housed respectively and are contrasted with empty crucible 7, and the gas in the gas cylinder 1 in the air supply system is through behind the air valve 2, again through the moisture in the gas cleaning unit 3 removal gases that anhydrous silica gel is housed; Get in the thermobalance 4 through the gas that purifies; Exhaust treatment system 8 is equipped with in thermobalance 4 exits, and thermobalance 4 is connected with temperature control system 9 and gas control system 10, said crucible internal diameter 4～6mm; High 1～6mm, material is 98wt%Al
2O
3Gas in the gas cylinder is industrial reducing gas CO (purity 99%), also can be refrigerating gas N
2Said computer data processing system requires the hard disc of computer configuration greater than 50G, and internal memory is greater than 256M, and 32M independence video card is configured to.
Experimental provision of the present invention is measured the method for Iron Ore Powder reductibility; Be to adopt differential thermal balance equipment to measure; Mainly be based on the thermogravimetry (TG) theory, real-time collecting temperature data and qualitative data in the course of reaction, the temperature variant curve of the weight that writes down in the test is called thermogravimetric curve.Utilize the test unit of above-mentioned () to measure blast furnace iron ore (sintering deposit, pellet and lump ore) reductibility commonly used.
The step of said novel Iron Ore Powder reductibility assay method is following:
1) get 100～200g iron ore sample, granularity is 10～12.5mm, under 105 ℃ of temperature, dries 120min, to remove moisture;
The Iron Ore Powder of 2) getting after a certain amount of oven dry is crushed to below 200 orders with the enclosure-type sampling machine;
3) take by weighing broken good test specimen 50 ± 1mg and put into crucible; The crucible that test specimen is housed is put on the thermobalance, heated up, be warming up to 900 ℃, logical N in this process by 10～30 ℃/min heating rate
2Protection;
4) behind 900 ℃ of insulation 30min, feed reducing gas CO, reducing gas CO flow is 15mL/min, reaction time 180min; After the off-test, logical N
2Be cooled to room temperature;
5) utilize thermogravimetric curve to combine FeO content and TFe cubage in the iron ore to go out the reduction degree of iron ore;
6) take by weighing the Iron Ore Powder of same weight again, repeat above-mentioned steps 2～3 times, calculate the mean value of its reduction of iron ore degree, and with its mean value as reduction of iron ore degree index.
[specific embodiment 1]
Get each 200g of three kinds of iron ores (sintering deposit, pellet and lump ore) sample respectively; Granularity is 10～12.5mm, puts into drying box, under 105 ℃ of temperature, dries 120min; Utilize the enclosure-type sampling machine to be crushed to below 200 orders after cooling, 50 ± 1mg sample of weighing then is for use.
The iron ore sample is put into crucible 5, utilize 9 pairs of thermobalances of temperature control system 4 to carry out temperature programme then, test divides three sections, first section: 0～900 ℃, and 20 ℃/min of heating rate, the N of logical 20ml/min
2Protection; Second section: 900 ℃ of constant temperature, the time is 30min, the N of logical 20ml/min
2Protection; The 3rd section: 900 ℃ of constant temperature feed reducing gas CO and carry out reduction test, and reducing gas flow CO is 15mL/min, and the time is 180min.After the off-test, logical N
2Cooling protection is to room temperature.Utilize thermogravimetric curve that computer data processing system obtains to combine FeO content and TFe cubage in the iron ore to go out the reduction degree of iron ore.The iron ore test findings is seen shown in the table 1.
Iron ore (sintering deposit, pellet and the lump ore) reduction degree that table 1 blast furnace is commonly used is measured result (%)
| Iron ore | Thermogravimetry (TG) | National Standard Method |
| Sintering deposit | 90.9 | 85.5 |
| Pellet | 76.6 | 70.2 |
| Lump ore | 68.1 | 64.5 |
Can find out from above embodiment: use reduction of iron ore determinator of the present invention can measure the reducing property of different iron ores accurately, and result and GB GB/T13241-91 have good consistance.
Claims (4)
1. an Iron Ore Powder reductibility determinator comprises air supply system, thermobalance; Exhaust treatment system (8), temperature control system (9), gas control system (10) and computer data processing system (11); It is characterized in that; Said air supply system comprises gas cylinder (1), air valve (2), gas cleaning unit (3); Said thermobalance comprises thermobalance (4), crucible (5), test specimen (6), and contrast is with empty crucible (7); Said exhaust treatment system (8) is connected with thermobalance, in order to the harmful gas that produces in the Processing Test; Temperature control system (9) is connected with thermobalance with gas control system (10) one ends, the computer data processing system (11) of other end connection processing test figure.
2. device according to claim 1 is characterized in that, place respectively at said thermobalance (4) two ends
Be equipped with iron ore test specimen (6) crucible (5) and the contrast with empty crucible (7); Behind the gas process air valve (2) in the gas cylinder in the air supply system (1); Remove the moisture in the gas through the gas cleaning unit (3) that anhydrous silica gel is housed again; Gas through purifying gets in the thermobalance (4), and exhaust treatment system (8) is equipped with in thermobalance (4) exit, and thermobalance 4 is connected with temperature control system (9) and gas control system (10).
3. determinator according to claim 1 is characterized in that, said crucible internal diameter 4～6mm, and high 1～6mm, material is 98wt%Al
2O
3
4. Iron Ore Powder reductibility assay method, its step is following:
1) get 100 ~ 200g iron ore sample, granularity is 10 ~ 12.5mm, under 105 ℃ of temperature, dries 120min, to remove moisture;
The Iron Ore Powder of 2) getting after a certain amount of oven dry is crushed to below 200 orders with the enclosure-type sampling machine;
3) take by weighing broken good test specimen 50 ± 1mg and put into crucible; The crucible that test specimen is housed is put on the thermobalance, heated up, be warming up to 900 ℃, logical N in this process by 10 ~ 30 ℃/min heating rate
2Protection;
4) behind 900 ℃ of insulation 30min, feed reducing gas CO, the reducing gas flow is 15mL/min, reaction time 180min; After the off-test, logical N
2Be cooled to room temperature;
5) utilize thermogravimetric curve to combine FeO content and TFe cubage in the iron ore to go out the reduction degree of iron ore;
6) take by weighing the Iron Ore Powder of same weight again, repeat above-mentioned steps 2～3 times, calculate the mean value of its reduction of iron ore degree, and with its mean value as reduction of iron ore degree index.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076256A (en) * | 2012-12-31 | 2013-05-01 | 东北大学 | Device and method for detecting iron ore raw material |
| CN103645114A (en) * | 2013-12-18 | 2014-03-19 | 重庆大学 | Iron-containing raw material gas-based reduction and slagging process experiment method and iron-containing raw material gas-based reduction and slagging device |
| CN107632041A (en) * | 2017-10-27 | 2018-01-26 | 北京科技大学 | A kind of method and system of on-line measurement pellet ore reduction swellability |
| CN109612882A (en) * | 2018-11-27 | 2019-04-12 | 武汉钢铁有限公司 | A kind of test different fuel granularity is to the method and device of sinter reproducibility differentia influence |
| CN110346539A (en) * | 2019-07-12 | 2019-10-18 | 重庆大学 | Reduction of iron ore soft melting dropping performance measurement device and method in a kind of blast furnace |
| CN113151620A (en) * | 2021-03-11 | 2021-07-23 | 首钢集团有限公司 | Smelting method and device for titanium-containing furnace burden |
| CN113484358A (en) * | 2021-05-27 | 2021-10-08 | 深圳技术大学 | Two-way air inlet thermal analyzer for transition metal powder reaction |
| CN114814072A (en) * | 2022-05-05 | 2022-07-29 | 中冶赛迪工程技术股份有限公司 | System and method for direct reduction and comprehensive thermal analysis and determination of powdery iron ore and application of system and method |
| CN115356232A (en) * | 2022-08-23 | 2022-11-18 | 哈尔滨工业大学 | Method for accurately testing oxidation threshold temperature of titanium alloy and composite material in situ |
| CN116183812A (en) * | 2022-12-05 | 2023-05-30 | 上海金艺检测技术有限公司 | Full-automatic determination method for ferrous oxide content in steel |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076256B (en) * | 2012-12-31 | 2015-10-28 | 东北大学 | The pick-up unit detected for iron ore raw material and method |
| CN103076256A (en) * | 2012-12-31 | 2013-05-01 | 东北大学 | Device and method for detecting iron ore raw material |
| CN103645114A (en) * | 2013-12-18 | 2014-03-19 | 重庆大学 | Iron-containing raw material gas-based reduction and slagging process experiment method and iron-containing raw material gas-based reduction and slagging device |
| CN103645114B (en) * | 2013-12-18 | 2016-08-17 | 重庆大学 | A kind of iron-bearing material gas-based reduction, slagging course experimental technique and device |
| CN107632041A (en) * | 2017-10-27 | 2018-01-26 | 北京科技大学 | A kind of method and system of on-line measurement pellet ore reduction swellability |
| CN109612882B (en) * | 2018-11-27 | 2021-05-28 | 武汉钢铁有限公司 | Method and device for testing influence of different fuel particle sizes on reduction difference of sinter |
| CN109612882A (en) * | 2018-11-27 | 2019-04-12 | 武汉钢铁有限公司 | A kind of test different fuel granularity is to the method and device of sinter reproducibility differentia influence |
| CN110346539A (en) * | 2019-07-12 | 2019-10-18 | 重庆大学 | Reduction of iron ore soft melting dropping performance measurement device and method in a kind of blast furnace |
| CN113151620A (en) * | 2021-03-11 | 2021-07-23 | 首钢集团有限公司 | Smelting method and device for titanium-containing furnace burden |
| CN113151620B (en) * | 2021-03-11 | 2022-09-13 | 首钢集团有限公司 | Smelting method and device for titanium-containing furnace burden |
| CN113484358A (en) * | 2021-05-27 | 2021-10-08 | 深圳技术大学 | Two-way air inlet thermal analyzer for transition metal powder reaction |
| CN113484358B (en) * | 2021-05-27 | 2024-01-05 | 深圳技术大学 | Two-way inlet gas thermal analyzer for transition metal powder reaction |
| CN114814072A (en) * | 2022-05-05 | 2022-07-29 | 中冶赛迪工程技术股份有限公司 | System and method for direct reduction and comprehensive thermal analysis and determination of powdery iron ore and application of system and method |
| CN115356232A (en) * | 2022-08-23 | 2022-11-18 | 哈尔滨工业大学 | Method for accurately testing oxidation threshold temperature of titanium alloy and composite material in situ |
| CN116183812A (en) * | 2022-12-05 | 2023-05-30 | 上海金艺检测技术有限公司 | Full-automatic determination method for ferrous oxide content in steel |
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Application publication date: 20121107 |