CN201434812Y - Device for measuring moisture capacity of iron ore powders - Google Patents
Device for measuring moisture capacity of iron ore powders Download PDFInfo
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- CN201434812Y CN201434812Y CN2009201280748U CN200920128074U CN201434812Y CN 201434812 Y CN201434812 Y CN 201434812Y CN 2009201280748 U CN2009201280748 U CN 2009201280748U CN 200920128074 U CN200920128074 U CN 200920128074U CN 201434812 Y CN201434812 Y CN 201434812Y
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Abstract
The utility model discloses a device for measuring moisture capacity of iron ore powders. The device comprises a U-shaped water tank, a cylindrical container and an electronic balance, and is characterized in that the U-shaped water tank is placed horizontally, two openings of the U-shaped water tank have equal heights, a water storage tank and the cylindrical container are respectively arranged on the upper portions of the two openings of the U-shaped water tank; a lifting rope disposed above the cylindrical container is enabled to move up and down inside one opening of the U-shaped water tank; scale marks are arranged on the lateral wall of the U-shaped water tank correspondingly to an opening end of the cylindrical container; the lifting rope of the cylindrical container is connected with a weighing disk of the electronic balance; the water storage tank is used for supplying water source to the U-shaped water tank, water levels of the openings of the U-shaped water tank are always kept at the highest position. By using the device to enable buoyancy force acting on the container to reach equilibrium with the interfacial tension force of water and the container, the moisture capacity of the iron ore powders can be measured through measurement data. As the equilibrium between the buoyancy force acting on the container and the interfacial tension force of the water and the container is considered, the measurement data can be more accurate. Besides, the device also solves the problem of not measuring suitable water distributing quantity in the mixing and palletizing process of different mineral powders and various mineral powders in the current field of iron ore powders.
Description
Technical field
The utility model relates to a kind of device of measuring the Iron Ore Powder wet volume capacity, belongs to the application experiment equipment in Ferrous Metallurgy field.
Background technology
In the Ferrous Metallurgy field, water distributions such as Iron Ore Powder, coke, flux are mixed,, obtain to have the compound bead that certain particle size distributes, on chassis, finally obtain the required sintering deposit of blast furnace ironmaking then by down draft sintering by the ball effect of making of cylindrical mixer.In this process, water distribution quantity is to the behavior of making ball of compound, and the size-grade distribution of final compound bead has material impact.Intensity and size that suitable water distribution quantity can guarantee to mix bead, again using water wisely to the full extent and reduce sintering required join carbon.At present, the most TECHNIQUE TO LARGE INTEGRATED STEEL WORKS of China are produced required iron ore and are mainly relied on import.Along with the price of imported iron ore stone rises steadily, the used iron ore of sintering is of a great variety, the composition fluctuation is big, brings very big difficulty to sintering circuit.When raw materials for sintering was stablized, manufacturing enterprise can find suitable mixing water distribution quantity by corresponding laboratory and commerical test.But, when raw material complexity, kind and composition all in fluctuation time, suitable water distribution quantity determine to become difficulty.Especially from international market selection, purchasing process, more need a simple and practical method test analysis is carried out in the mixing granulation behavior of iron ore.In the actual production, sintering feed mixing water distribution quantity is fixing often, and its change lags behind raw material and change, in case when tangible quality problems appear in sintering circuit, just will consider the technological parameter of granulation process.The operator changes the mixing granulation behavior that causes to raw material and changes effectively assessment of shortage.Therefore, it is very necessary inventing the suitable water distribution quantity device and method of a kind of simple and practical measuring and calculating compound.
The utility model content
In prior art, in the Iron Ore Powder field, the problem that can not measure the suitable water distribution quantity of different breezes and multiple breeze processes of mixing and granulating, the purpose of this utility model is to provide a kind of experimental provision of analyzing and measuring the Iron Ore Powder wet volume capacity, calculating the suitable water distribution quantity of compound by wet volume capacity, and the suitable water distribution quantity of sintering Iron Ore Powder is assessed.
The purpose of this utility model is achieved in that the device of measuring the Iron Ore Powder wet volume capacity, it is characterized in that, comprises U-shaped tank, cylindrical vessel and electronic balance; U-shaped tank level is shelved, and the contour and top of two openings of U-shaped tank is respectively equipped with reserve tank and cylindrical vessel, and the top of cylindrical vessel is provided with lifting rope and it is moved up and down in an opening of U-shaped tank; The sidewall of the corresponding cylinder container open end of U-shaped tank is provided with scale mark; The lifting rope of cylindrical vessel links to each other with the scales/electronic balance weighing dish; Reserve tank provides the water source to the U-shaped tank, makes the water level of U-shaped tank opening remain at highest point.
Further, described electronic balance also is connected with computing machine, is used for its weighing result input and calculating and demonstration.
Adopt the utility model to measure the method for Iron Ore Powder wet volume capacity, comprise the steps:
1) mineral pre-service
At first, Iron Ore Powder to be measured is put into baking oven, evaporate moisture contained in the Iron Ore Powder; Then, treat that Iron Ore Powder is cooled to room temperature after, it is standby to put into drying bottle;
2) mensuration of wet volume capacity
Adopt described measurement mechanism to measure, comprise the steps:
A, be tiled in the bottom of glass cylinder container, will the glass cylinder container soak and allow the filter paper suction saturated fully in the entry with filter paper;
B, take by weighing the above-mentioned Iron Ore Powder to be measured of 200g-300g and pack in the glass cylinder container in A step, it is piled up naturally; After installing cylindrical vessel is hung over weighing on the electronic balance, treat that registration is stable after, with the balance zero clearing;
C, this cylindrical vessel is immersed in h under water, makes the tension force at suffered buoyancy of cylinder and water-cylinder interface reach balance, balance returns zero again; Wherein, the glass cylinder container is immersed in the relevant of under water degree of depth h and cylindrical vessel diameter D:
σ is the surface tension of water, and θ is the contact angle of water and glass, and ρ is 10
3Kg/m
3
D, along with the time changes, Iron Ore Powder begins suction, the balance registration constantly increases, and with data recording;
E, when the balance data stabilization, the last registration of balance is the wet volume capacity of the Iron Ore Powder of surveying, and is designated as m.
The method of measuring and calculating sinter mixture water distribution quantity is that the wet volume capacity m according to the Iron Ore Powder that records calculates, and the wet volume capacity of the Iron Ore Powder of surveying reflects the water-intake capacity of these mineral and owing to capillary force is present in intergranular liquid water content; The suitable water distribution quantity and the wet volume capacity of sintering feed are calculated in the following relationship, that is:
w＝k·m+n
In the formula, w is the suitable water distribution quantity of sintering feed, and k is a scale-up factor, adds relating to parameters such as speed with the rotating speed of cylindrical mixer, inclination angle, material, and k and n are by utilizing least square fitting to obtain to experimental data.M by the wet volume capacity of survey Iron Ore Powder, n is for revising constant; Need to prove that for identical cylindrical mixer, the value of its k and n is fixed.
Compared to existing technology, the utlity model has following advantage:
I. the utility model creatively proposes to solve by wet volume capacity and adds water mixing granulation field in Iron Ore Powder at present, can't carry out the problem of Theoretical Calculation and quantitative forecast to different breezes and the suitable water distribution quantity of multiple breeze processes of mixing and granulating.
II. this device can make the suffered buoyancy of container and water-container interface equalization of strain, makes measurement data more accurate.
III. because measurement mechanism adopts the design of U type tank to guarantee the degree of depth that container contacts with water, the measuring error of avoiding liquid fluctuating to cause to greatest extent.
IV. use transparent glass container, be convenient to the Direct observation experimentation.
V. link to each other with computing machine,, realize record experimental data automatically, need not manual measurement, and reduced the possibility of personal error by corresponding computer software.
Description of drawings
Fig. 1 is the structural representation of the utility model method wet volume capacity proving installation;
Fig. 2 is cylinder and water contact angle synoptic diagram;
Fig. 3 is the graph of a relation of a kind of Iron Ore Powder wet volume capacity and best water distribution quantity.
Embodiment
As shown in Figure 1, measure the device of Iron Ore Powder wet volume capacity, comprise U-shaped tank 1, cylindrical vessel 2 and electronic balance 3; U-shaped tank 1 level is shelved, and the contour and top of two openings of U-shaped tank 1 is respectively equipped with reserve tank 4 and cylindrical vessel 2, and the top of cylindrical vessel 2 is provided with lifting rope and it is moved up and down in an opening of U-shaped tank 1; The sidewall of U-shaped tank 1 corresponding cylindrical vessel 2 openends is provided with scale mark 5, and the lifting rope of cylindrical vessel 2 links to each other with electronic balance 3 weighing pans; Reserve tank provides the water source to the U-shaped tank, makes the water level of U-shaped tank opening remain at highest point.
Adopt the method for this measurement device Iron Ore Powder wet volume capacity, concrete steps comprise:
1, ore deposit pre-service
At first, get Iron Ore Powder raw ore (as 2 kilograms) and put into baking oven, note making the fine ore tiling as far as possible, the control temperature evaporates moisture contained in the raw ore at 200 ℃, be incubated 4 hours, the ore deposit mixing paved again, guarantee raw ore removal all moisture of raw ore and avoid taking place caking phenomenon every one hour.After treating that raw ore is cooled to room temperature, put into drying bottle and store.
2, the mensuration of wet volume capacity
1) claims sample: the Iron Ore Powder above-mentioned to be measured about weighing 200g;
2) prepare the glass cylinder container: be tiled in the bottom of glass cylinder container 2 with filter paper, will glass cylinder container 2 soak and allow the filter paper suction saturated fully in the entry;
3) in the glass cylinder container 2 load weighted breeze to be measured is packed into step 2), make it pile up DO NOT CRUSH naturally; Hang over weighing on the electronic balance 3 after installing, treat that registration is stable after, with the balance zero clearing;
4) (as when D is 3cm, the immersion depth h1 of cylinder was 0.86mm when calculating can get balance glass cylinder container 2 to be immersed under water h; When D was 10cm, h1 was 0.25mm, and D is the diameter of glass cylinder container), make glass cylinder container 2 suffered buoyancy and interfacial tension balance, balance returns zero again;
5) along with the time changes, the recording balance registration;
6) when the balance data stabilization (double measuring error is no more than 0.1g), the last registration of balance is the wet volume capacity of the mineral of surveying, and is designated as m.
The value of theoretical derivation h:
Suppose: the diameter of glass cylinder container is D, and the contact angle of water and glass cylinder container is θ, the surface tension σ of water.As shown in Figure 2.
Contact in the water when the glass cylinder container rigidly connects, sample (breeze to be measured) is not when also having enough time to absorb water, and the suffered power of glass cylinder container 2 in the vertical directions is the capillary component of water, that is:
F＝π·D·cosθ·σ (1)
When the glass cylinder container was deep into that the degree of depth is h under water, the suffered buoyancy of glass cylinder container was:
f＝ρ·g·π·D
2·h/4 (2)
When interfacial tension and buoyant equilibrium, can be in the hope of the insertion depth of glass cylinder container:
If the σ of known water is the contact angle θ of 72.75mN/m, water and glass is that 30 °, ρ are 10
3Kg/m
3, the diameter D of the immersion depth h of cylinder and glass cylinder container relation when calculating can get balance.
To sum up, can record the wet volume capacity of Iron Ore Powder to be measured by said method and device.
The utility model be the more important thing is, can calculate the suitable water distribution quantity of compound according to this wet volume capacity, and concrete steps are as follows:
The sintered mix pelletization will be loaded in the cylindrical mixer after raw material (Iron Ore Powder, coke and the flux) water distribution exactly.Raw material rotatablely moves with cylindrical mixer, is constantly colliding in the contact process, and particle relies on and the capillary force of water effect is bonded together.In addition, raw material self is because its porosity characteristic also will absorb moisture.Therefore, institute's hygrometric capacity has reflected the water-intake capacity of mineral and owing to capillary force is present in intergranular liquid water content in the utility model.The suitable water distribution quantity and the wet volume capacity of sintering feed are calculated in the following relationship, that is:
w＝k·m+n (4)
In the formula, w is the suitable water distribution quantity of sintering feed, and k is a scale-up factor, m by the wet volume capacity of survey Iron Ore Powder, n is for revising constant; Wherein, w is the suitable water distribution quantity of sintering feed, and same relatively cylindrical mixer can obtain according to actual mixing granulation experiment; K and n are by utilizing least square fitting to obtain to experimental data.
Application example: following is that example is described further this utility model with certain Iron Ore Powder.
The test result of wet volume capacity is as shown in table 1:
| Time/min | 0.50 | 1.00 | 1.50 | 2.00 | 2.50 | 3.00 | 3.50 | 4.00 | 4.50 | 5.00 | 5.50 | 6.00 |
| Water cut/% | 7.91 | 8.69 | 9.65 | 10.27 | 10.77 | 11.18 | 11.47 | 11.58 | 11.61 | 11.62 | 11.63 | 11.63 |
Design experiment research amount of water is to the influence of sintering granulating efficiency, in general, is the gas penetration potential that guarantees sinter bed and the quality of sintering deposit in industrial sintering process, requires behind the mixture granulation particle of 3-8mm The more the better.Facility for granulating is selected industrial cylinder mixing device for use.In following group of test, set amount of water respectively and be respectively 6%, 6.5% and 7%.Incorporation time was fixed as 6 minutes.Experimental result is as follows:
Mixing granulation effect under the different water distribution quantities of table 2
| Water distribution quantity % | ＞10mm | 10-8mm | 8-5mm | 5-3mm | 3-1mm | 1-0.7mm | 0.7-0.2mm | ＜0.2mm | 3- |
| 6 | 4.55 | 2.94 | 20.04 | 29.02 | 27.46 | 4.69 | 11.31 | 4.55 | 49.06 |
| 6.5 | 9.79 | 5.32 | 34.98 | 30.89 | 14.27 | 2.96 | 1.79 | 9.79 | 65.96 |
| 7 | 12.88 | 5.26 | 35.75 | 26.36 | 14.61 | 2.47 | 2.67 | 12.88 | 62.11 |
Can find that by test figure when water distribution quantity was 6.5, the granulating efficiency of compound was best.
Same method is studied the relation of other mineral wet volume capacitys and best water distribution quantity, and all test findings as shown in Figure 3;
By experimental data is carried out the relation that linear regression obtains best water distribution quantity and wet volume capacity:
y＝0.47·x+1.19 (5)
In the formula, x is a wet volume capacity, and y is the best water distribution quantity of mixed pelletization.
Need only the wet volume capacity that has obtained certain Iron Ore Powder by test like this, promptly can calculate the water distribution quantity of actual compound the best according to formula (5).
Protection domain of the present utility model is not restricted to this embodiment, and it can also be made in the protection domain of claim and well known to a person skilled in the art all equivalent variations, and it still belongs to the scope of the application's protection.
Claims (3)
1, measures the device of Iron Ore Powder wet volume capacity, it is characterized in that, comprise U-shaped tank (1), cylindrical vessel (2) and electronic balance (3); U-shaped tank (1) level is shelved, and the contour and top of two openings of U-shaped tank (1) is respectively equipped with reserve tank (4) and cylindrical vessel (2), and the top of cylindrical vessel (2) is provided with lifting rope and it is moved up and down in an opening of U-shaped tank (1); The sidewall of the corresponding cylindrical vessel of U-shaped tank (1) (2) openend is provided with scale mark; The lifting rope of cylindrical vessel (2) links to each other with electronic balance (3) weighing pan; Reserve tank provides the water source to the U-shaped tank, makes the water level of U-shaped tank opening remain at highest point.
According to the device of the described measurement Iron Ore Powder of claim 1 wet volume capacity, it is characterized in that 2, described electronic balance (3) also is connected with computing machine (6).
According to the method for the described measurement Iron Ore Powder of claim 1 wet volume capacity, it is characterized in that 3, described cylindrical vessel (2) is made for transparent glass, plastics or resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201280748U CN201434812Y (en) | 2009-07-16 | 2009-07-16 | Device for measuring moisture capacity of iron ore powders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201280748U CN201434812Y (en) | 2009-07-16 | 2009-07-16 | Device for measuring moisture capacity of iron ore powders |
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| CN201434812Y true CN201434812Y (en) | 2010-03-31 |
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| CN2009201280748U Expired - Fee Related CN201434812Y (en) | 2009-07-16 | 2009-07-16 | Device for measuring moisture capacity of iron ore powders |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2009
- 2009-07-16 CN CN2009201280748U patent/CN201434812Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100331 Termination date: 20120716 |