CN210293970U - H2Experimental device for reducing iron ore - Google Patents
H2Experimental device for reducing iron ore Download PDFInfo
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- CN210293970U CN210293970U CN201921152176.3U CN201921152176U CN210293970U CN 210293970 U CN210293970 U CN 210293970U CN 201921152176 U CN201921152176 U CN 201921152176U CN 210293970 U CN210293970 U CN 210293970U
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Abstract
H2The experimental device for reducing iron ore comprises N placed in a safety alarm gas cylinder cabinet2Gas cylinder and H2Gas cylinder, N2Gas cylinder and H2The output ends of the gas cylinders are respectively connected with N2Glass rotameter and H2On glass rotameter, N2Glass rotameter and H2The glass rotameter is arranged below a quartz hanging tube through a ventilating silica gel hose, the quartz hanging tube is placed in an SRJK-6-9 tube type resistance furnace, the temperature in the SRJK-6-9 tube type resistance furnace is controlled through a DRZ-12 resistance furnace temperature controller, a device for weighing is arranged at the top of the quartz hanging tube, and the device for weighing is placed on a laboratory bench. The utility model has simple structure,Flexible operation, rapid detection, accurate and reliable experimental data, convenient adjustment, low use and maintenance cost, and H2The experimental process as the reducing agent has the characteristics of safety, reliability, environmental protection and the like.
Description
Technical Field
The utility model relates to an ironmaking technical field, in particular to H2An experimental device for reducing iron ore.
Background
H2The experimental apparatus for reducing iron ore is an experimental apparatus for measuring a change in the degree of reduction of iron ore (or sintered ore) with time during a reduction process. The reduction performance of the iron ore has great influence on the technical and economic indexes of blast furnace smelting, the reduction performance (reduction degree) of the iron ore is good, the material basis is provided for the development of the in-furnace indirect reduction, the coke ratio can be reduced, and the yield is improved. It is therefore one of the important metallurgical properties of iron-containing mineral raw materials.
The prior experimental device for measuring the reducing performance of the iron ore is an iron ore high-temperature reduction experimental device, the device has a complicated electrical and mechanical operation structure, the shell and the top of the high-temperature electric furnace are cooled by circulating water, and the maintenance is difficult. Meanwhile, a gas (CO) generator, a gas purification system and the like are required to be used in a matched manner, the experimental operation process is complex and tedious, the experimental process is not visual enough, and the experimental period is long in time consumption. The whole set of experimental equipment is high in price (about 30 ten thousand yuan), and the price of consumable materials for experiments is also high. In addition, gas (CO) is used as a reducing agent and gas poisoning must also be prevented.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide an H2Experimental facility for reduction of iron ores, using H2As a reducing agent, the method has the characteristics of safe, reliable and environment-friendly experimental process, simple structure, flexible operation, quick detection, accurate and reliable experimental data, convenient adjustment, low use and maintenance cost and the like.
In order to realize the purpose, the utility model discloses a technical scheme is:
h2The experimental device for reducing iron ore comprises N placed in a safety alarm gas cylinder cabinet 12Gas cylinders 2 and H2Gas cylinder 3, said N2Gas cylinders 2 and H2The output ends of the gas cylinders 3 are respectively connected with N2Glass rotameter 5 and H2On glass rotameter 6, N2Glass rotameter 5 and H2The glass rotameter 6 is soft by ventilating silica gelThe tube 15 is connected to the bottom of the quartz hanging tube 12, the quartz hanging tube 12 is placed in the SRJK-6-9 tube type resistance furnace 9, the temperature in the SRJK-6-9 tube type resistance furnace 9 is controlled through the DRZ-12 resistance furnace temperature controller 4, a device for weighing is arranged at the top of the quartz hanging tube 12, and the device for weighing is placed on an experiment table.
The DRZ-12 resistance furnace temperature controller 4 is connected with the PtRh arranged on the SRJK-6-9 tubular resistance furnace 9 through a pipeline10the-Pt thermocouple 10 is connected, and the DRZ-12 resistance furnace temperature controller 4 is used for supplying electric energy to the SRJK-6-9 tubular resistance furnace 9 through a power line 13.
The weighing device is a TG standard balance (manual weighing) or an ES5000 electronic balance (automatic weighing).
Said N2Glass rotameter 5 and H2The glass rotameter 6 is provided with a flow regulating three-way valve 11, and the flow regulating three-way valve 11 is used for regulating N2Glass rotameter 5 and H2Switch of glass rotameter 6.
H in the SRJK-6-9 tubular resistance furnace 92The reduction measurement conditions were 800 ℃ and H2Flow rate 600ml/min, N2The reduction determination conditions are that the flow is 600ml/min, the granularity of the ore sample is 2-3 mm, the mass of the ore sample is 30000mg, and the total reduction time is 45 min.
H2The use method of the experimental device for reducing the iron ore comprises the following steps:
weighing a sample 30000mg (sinter) and putting the sample into a quartz hanging tube 12, moving the sample into an SRJK-6-9 tubular resistance furnace 9 for generating the internal temperature, connecting the quartz hanging tube 12 in the SRJK-6-9 tubular resistance furnace 9 by using a ventilated silica gel hose 15 when the temperature rises to 300 ℃, opening N2Gas cylinder 2 switching flow regulating three-way valve 11 to N2The gear is switched in N2Adjusting LZW-18 (N)2) The flow rate of the glass rotameter 5 is 600ml/min, so that the sample is protected from being oxidized;
stopping introducing N when the temperature rises to 800 DEG C2Switching the flow-regulating three-way valve 11 to H2Gear position, let in H2The flow rate is adjusted to 600ml/min, and the period of introducing reducing gas is 5 min. Stopping H every 5min2Pulling out the silicone tube 15 and the quartz hanging tube 12Connecting, weighing weight loss recording data (H)2Oxygen content lost from iron ore during reduction) can be repeated until 45min using a TG standard balance (manual weighing) or using an ES5000 electronic balance (automatic weighing) 7;
and (4) counting the recorded data, calculating reduction degree values corresponding to time nodes of 5, 10, 15, 20, 25, 30, 35, 40 and 45, and drawing a r-t (min) curve.
The utility model has the advantages that:
compared with the prior art, the utility model discloses simple structure, the operation is nimble. The measured data is accurate and reliable, the measured result consumes less time, and the weighing mode can be selected from a manual mode or an automatic mode. The construction cost and the maintenance cost of the instrument are low, the consumption cost during measurement is low, the operation procedure is simple, and the operator can easily master the operation procedure. The experimental process has the characteristics of safety, reliability, environmental protection and the like.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 shows an embodiment of the present invention, which is used for sintering a mine H2Reduction degree in reduction versus reduction time.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1 of the drawings, in which,
H2the experimental device for reducing iron ore comprises a safety alarm gas cylinder cabinet 1; 2.N2A gas cylinder; 3.H2A gas cylinder; a DRZ-12 resistance furnace temperature controller; LZW-18 (N)2) A glass rotameter; LZW-18 (H)2) A glass rotameter; TG standard balance (manual weighing) or using ES5000 electronic balance (automatic weighing); 8. a laboratory bench; 9, SRJK-6-9 tubular resistance furnace; PtRh 1010-a Pt thermocouple; 11. a flow regulating three-way valve; 12. a quartz hanging tube; 13. a power line; 14. a vent connection valve; 15. a silicone hose; and N2Gas, H2A pneumatic reducing valve, etc.
The reducing agents in the blast furnace are CO and H2And solid carbon. In actual production, H2From the drumWind-humidified blowing, and blowing (natural gas, oil, coal powder).
1. The reduction reaction in the blast furnace is basically divided into two categories:
1.1: i.e. using CO or H2As a reducing agent, the final gas product being CO2And H2The reaction of O, called indirect reduction, is an exothermic reaction (CO is exothermic, H2Absorbing heat but H2Less than CO throughout the reduction and thus an exothermic reaction).
Fe2O3+3CO＝2Fe+3CO2Fe2O3+3H2＝2Fe+3H2O
1.2: where C is used as the reducing agent and the final gaseous product is CO, it is called direct reduction reaction
The thermal effect should be endothermic, requiring a large amount of heat to be consumed.
FeO+CCoke (coke)＝Fe+CO
Degree of direct reduction r of irondLinear to the coke ratio: ar ═ Kd+b……①
∵rd+ri＝1 ∴rd＝1-ri
Will r isi＝1-rdSubstitution into ① formula K ═ a (1-r)i)+b＝(a+b)－ari＝c-ari……②
a. b-are correction factors, which are related to a series of factors.
According to the formula, the indirect reduction is developed, and the larger the Ri is, the lower the coke ratio K is. The sintered ore and pellet ore with high reducibility, low FeO, high grade, low slag content and good high-temperature metallurgical performance are adopted, so that the coke ratio can be obviously reduced in the actual production. (generally, the direct reduction degree is reduced by 50Kg/t every time the coke ratio is reduced by 0.1), and the yield is improved. Therefore, for the iron and steel enterprises which are built or newly built, the reduction performance of the charged iron ore is researched so as to take measures before smelting and improve the reduction performance of the ore.
2. The experiment is carried out with H2As a reducing agent to reduce iron oxides. Through experiments, the reduction degree of certain ore can be known, so thatIs reasonably and fully utilized.
2.1 calculation of degree of reduction:
2.2 calculation of the total oxygen content in iron oxides in the ore sample:
Ogeneral assembly＝(0.4285·TFe－0.1111·FeO)·G
In the formula: g- - - -weight of the sample before reduction (mg)
3.H2The reduction degree determination principle, the determination method, the experimental device structure and the reduction determination conditions of the reduced iron ore are as follows:
3.1 measurement principle:
when the temperature is more than 570 ℃, the reduction process of the iron oxide is carried out from high valence to low valence according to the oxygen potential or decomposition pressure:
Fe2O3→Fe3O4→FeO→Fe
3.2 determination method: weight reduction method
3.3H2The structure of the experimental device for reducing iron ore:
1. a safety alarm gas cylinder cabinet; 2.N2A gas cylinder; 3.H2A gas cylinder; a DRZ-12 resistance furnace temperature controller; LZW-18 (N)2) A glass rotameter; LZW-18 (H)2) A glass rotameter; TG standard balance (manual weighing) or using ES5000 electronic balance (automatic weighing); 8. a laboratory bench; 9, SRJK-6-9 tubular resistance furnace; PtRh 1010-a Pt thermocouple; 11. a flow regulating three-way valve; 12. a quartz hanging tube; 13. a power line; 14. a vent connection valve; 15. a silicone hose; and N2Gas, H2A pneumatic reducing valve, etc.
3.4 reduction assay conditions:
temperature 800 ℃ and H2Flow rate 600ml/min, N2The flow rate is 600ml/min, the granularity of the ore sample is 2-3 mm, the mass of the ore sample is 30000mg, and the total reduction time is 45 min.
3.5 operating procedures:
3.5.1 sample 30000mg (sinter) packPutting into a quartz hanging tube 12, moving into an SRJK-6-9 tubular resistance furnace 9 for generating internal temperature, when the temperature is raised to 300 ℃, connecting the quartz hanging tube 12 in the SRJK-6-9 tubular resistance furnace 9 by using a ventilated silica gel hose 15, opening N2Gas cylinder 2 switching flow regulating three-way valve 11 to N2The gear is switched in N2Adjusting LZW-18 (N)2) The flow rate of the glass rotameter 5 is 600ml/min, and the sample is protected from being oxidized.
3.5.2 stop the N supply when the temperature rises to 800 DEG C2Switching the flow-regulating three-way valve 11 to H2Gear position, let in H2The flow rate is adjusted to 600ml/min, and the period of introducing reducing gas is 5 min. Stopping H every 5min2Pulling out the connection between the ventilating silica gel hose 15 and the quartz hanging tube 12, and weighing the weight loss recording data (H)2Oxygen content lost from iron ore during reduction) may be repeated up to 45min using a TG standard balance (manual weighing) or using an ES5000 electronic balance (automatic weighing) 7.
3.5.3, counting the recorded data, calculating the reduction degree values corresponding to each time node of 5, 10, 15, 20, 25, 30, 35, 40 and 45, and drawing a r-t (min) curve. (as shown in FIG. 2)
H for sinter2Reduction in reduction
Record of recovery process
*: remarks are the weight loss trend.
4. Note that:
4.1 the chamber is strictly pyrotechnic and kept ventilated to prevent hydrogen explosions.
4.2 balance usage should be performed strictly per operating protocol. The connection between the ventilating silica gel hose 15 and the quartz hanging tube 12 must be disconnected when the balance weighs.
4.3 since the reduction reaction was carried out continuously, the time and the corresponding weight loss of the sample were noted.
4.4 the gases used in this experiment were each high purity H2And electrolysis of N2The purity is over 99.9 percent. Otherwise, a gas cleaning device should be provided in the system to remove O therefrom2Sulfide, CO2，H2O, and the like.
4.5 the sample is loaded into the quartz hanging tube 12 and then hung into the furnace, and the hanging height and the center should be calibrated to strictly prevent the sample from contacting the furnace chamber wall of the tubular electric furnace.
4.6 if natural ore is used for reduction, roasting in other electric furnaces for 2 hours in advance, and firstly decomposing some impurities in the electric furnaces at the temperature of 800-900 ℃.
Through continuous test improvement of H2The experimental device for reducing iron ore has the following characteristics:
(1) the experimental device has simple structure and flexible operation. The measured data is accurate and reliable, and the measured result consumes less time.
The weighing mode can select a manual or automatic mode.
(2) The experimental device has low construction cost and maintenance cost, and the material consumption cost is low during the determination.
(3) The operator can easily grasp.
(4) The experimental process has the characteristics of safety, reliability, environmental protection and the like.
The experimental device is particularly suitable for serving as a professional experimental teaching instrument and professional testing equipment of medium and small industrial and mining enterprises in high and medium schools. The experimental device is tested repeatedly, and all technical indexes of the experimental device in normal operation meet the design requirements.
Claims (5)
1. H2The experimental device for reducing iron ore is characterized by comprising N placed in a safety alarm gas cylinder cabinet (1)2Gas cylinder (2) and H2Gas cylinder (3), said N2Gas cylinder (2) and H2The output ends of the gas cylinders (3) are respectively connected with N2Glass rotameter (5) and H2On glass rotameter (6), N2Glass rotameter (5) and H2The glass rotameter (6) is connected to the bottom of the quartz hanging tube (12) through the ventilating silica gel hose (15), and the quartz hanging tube (12) is placed on the SRJIn the K-6-9 tubular resistance furnace (9), the temperature in the SRJK-6-9 tubular resistance furnace (9) is controlled by a DRZ-12 resistance furnace temperature controller (4), a device for weighing is arranged at the top of the quartz hanging tube (12), and the device for weighing is placed on a laboratory bench.
2. A process according to claim 1, comprising2The experimental device for reducing iron ore is characterized in that the temperature controller (4) of the DRZ-12 resistance furnace is connected with the PtRh temperature controller arranged on the SRJK-6-9 tubular resistance furnace (9) through a pipeline10The temperature controller (4) of the DRZ-12 resistance furnace is connected with a Pt thermocouple (10) and is powered by an SRJK-6-9 tubular resistance furnace (9) through a power line (13).
3. A process according to claim 1, comprising2The experimental device for reducing the iron ore is characterized in that the weighing device is a TG standard balance or an ES5000 electronic balance.
4. A process according to claim 1, comprising2The experimental device for reducing iron ore is characterized in that N is2Glass rotameter (5) and H2A flow regulating three-way valve (11) is arranged on the glass rotameter (6), and the flow regulating three-way valve (11) is used for regulating N2Glass rotameter (5) and H2Switch of glass rotameter (6).
5. A process according to claim 1, comprising2The experimental device for reducing the iron ore is characterized in that H in the SRJK-6-9 tubular resistance furnace (9)2The reduction measurement conditions were 800 ℃ and H2Flow rate 600ml/min, N2The reduction determination conditions are that the flow is 600ml/min, the granularity of the ore sample is 2-3 mm, the mass of the ore sample is 30000mg, and the total reduction time is 45 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921152176.3U CN210293970U (en) | 2019-07-22 | 2019-07-22 | H2Experimental device for reducing iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921152176.3U CN210293970U (en) | 2019-07-22 | 2019-07-22 | H2Experimental device for reducing iron ore |
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| Publication Number | Publication Date |
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| CN210293970U true CN210293970U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921152176.3U Active CN210293970U (en) | 2019-07-22 | 2019-07-22 | H2Experimental device for reducing iron ore |
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| CN (1) | CN210293970U (en) |
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- 2019-07-22 CN CN201921152176.3U patent/CN210293970U/en active Active
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