CN109182737B - Characterization method of powder characteristics in iron ore powder pelletizing process and application of characterization method in iron ore pellets - Google Patents
Characterization method of powder characteristics in iron ore powder pelletizing process and application of characterization method in iron ore pellets Download PDFInfo
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Abstract
The invention discloses a characterization method of powder characteristics in an iron ore powder pelletizing process, wherein the powder characteristics in the iron ore powder pelletizing process comprise a volume change characteristic and a water retention characteristic, and the volume change characteristic is as follows: s1, drying the iron ore powder to obtain iron ore powder to be detected; s2, measuring the initial volume and the initial density of the iron ore powder to be measured, then applying a load force to the iron ore powder to be measured for compression, and measuring the compression volume and the compression density of the iron ore powder to be measured; and S3, calculating the volume change and the density change. Water retention property: s1, drying the iron ore powder to obtain iron ore powder to be detected; s2, measuring the initial mass of the iron ore powder to be measured, and dripping water into the container containing the iron ore powder to be measured to measure the total mass of the iron ore powder in a water saturation state and the container; s3, drying the iron ore powder in the water saturation state, and measuring the total mass of the dried iron ore powder and the container; and S4, calculating the saturated water content of the iron ore powder. The method has the advantages that the related physical property data of the iron ore powder are obtained, the quality of the green pellets of the pellet ore can be evaluated and estimated, and the method has important theoretical and practical significance.
Description
Technical Field
The invention relates to the field of blast furnace iron making, in particular to a characterization method of powder characteristics of iron ore powder variable characteristics and water retention characteristics in an iron ore powder pelletizing process and application of the characterization method in iron ore pellets.
Background
Sintered ore and pellet ore are main raw materials for blast furnace iron making. Compared with sintered ore, the pellet ore has the advantages of energy conservation, environmental protection and higher production cost. The main body is as follows: 1. the energy consumption of the pellet production process is about 50 percent of that of the sintered ore, which has important significance for the agglomeration of iron ore powder and energy conservation. 2. The pellet ore has high grade and low slag ratio, is beneficial to smelting with low fuel ratio, and is beneficial to the emission reduction operation of blast furnace ironmaking. 3. The main fuel of pellet production is coal gas, so that pellet flue gas purification is mainly desulfurization, and sintering flue gas purification has Nitrogen Oxides (NO) which are difficult to remove besides desulfurizationx) And dioxin, which can reduce the agglomeration cost of the iron ore powder to a certain extent; meanwhile, the method also has a positive effect on improving the environment. Therefore, from the aspects of both agglomeration and blast furnace ironmaking, the pellet ore has a larger development space, and the pellet ore is subjected toWill certainly go on to further research.
At present, the process of pellet forming can be roughly summarized as follows: balling, drying and roasting. Wherein, balling is caused by the characteristic of water dropping balling under natural state and the intensive ability under the mechanical force, and the balling process can be divided into 3 stages:
1. the method comprises the steps of forming a mother ball, wherein the water content of materials filled into a balling disc is usually 8-10%, the materials are in a loose state, each mineral powder particle is covered by adsorbed water and film water, capillary water only exists at a contact point between each particle, and the rest space is filled with air.
2. The mother ball grows up, the mother ball continues to roll on the balling disc, the mother ball is further compressed, the internal capillary becomes thin, and the excessive capillary water is squeezed to the surface of the mother ball, so that the over-wet mother ball bonds the mineral powder with less water around by the action of the capillary force, and the mother ball grows up.
3. Green balls are compacted, the green balls combined by capillary force only have low strength, and in order to improve the green ball strength, water spraying must be stopped to ensure that the green balls roll on a pelletizing disc, and capillary water in the green balls is completely squeezed out and absorbed by surrounding mineral powder; meanwhile, the mineral powder particles in the green pellets are arranged more closely, so that the water layers of the films are likely to contact with each other, a hydrated film shared by a plurality of particles is formed, the binding force is enhanced, and the green pellet strength is greatly improved. The green ball strength is improved, and the subsequent metallurgical process is facilitated.
Therefore, the volume occupied by the mineral powder is always changed in the balling process, and water is always involved in the balling and drying processes. Therefore, the method clearly represents the volume change characteristic and the water retention characteristic of the powder in the pelletizing process of the pellet ore and is beneficial to optimizing agglomeration process conditions. At present, in the prior art, a specific characterization method and an application case for the powder characteristics of the iron ore pelletizing process do not exist, and particularly, the research on the variable characteristics and the water holding characteristics of the iron ore powder in the agglomeration process is very little, so that the quantitative characterization of the variable characteristics and the water holding characteristics of the iron ore powder and the research on the relation between the variable characteristics and the water holding characteristics and the quality of the pellets have important theoretical and practical significance for improving the production efficiency of the pellets and the quality of the pellets.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a characterization method of powder characteristics in an iron ore powder pelletizing process and application of the characterization method in iron ore pellets. The method can obtain physical property data of the volume change characteristic and the water retention characteristic of the iron ore powder in the pelletizing process, can evaluate and estimate the quality of green pellets of the pellets, and has important theoretical and practical significance.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a characterization method of powder characteristics in an iron ore powder pelletizing process comprises the following steps: sa1, drying the iron ore powder to obtain iron ore powder to be detected; sa2, measuring initial volume V of iron ore powder to be measured1And initial density ρ1Then applying load force to the iron ore powder to be measured to compress the iron ore powder, and measuring the compression volume V of the iron ore powder2And a compressed density ρ2(ii) a Sa3, calculating the volume change rate delta V (V) of the iron ore powder to be measured1-V2)/V1And a density change rate Δ ρ ═ p (ρ ═ p2-ρ1)/ρ1Representing the iron ore powder variable characteristics by using delta V and delta rho;
the characterization of the water retention property comprises the following steps: sb1, drying iron ore powder to obtain iron ore powder to be detected; sb2, measuring initial mass m of iron ore powder to be measured0Then placing the iron ore powder into a container, adding water into the container containing the iron ore powder to be measured in a dropwise manner to obtain iron ore powder in a water saturation state, and measuring the iron ore powder in the water saturation state and the content of the containerTotal mass m1(ii) a Sb3, drying the iron ore powder in the water saturation state and a container to obtain dried iron ore powder, and measuring the total mass m of the dried iron ore powder and the container2(ii) a Sb4, calculating the saturated water content w ═ m of the iron ore powder to be measured1-m2)/m0And w is used for characterizing the water retention property of the iron ore powder.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, in the step Sa1, the drying temperature is 105-120 ℃, and the drying time is 3-5 h.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, in the step Sa2, the applied load force is 10-30N, and the duration of the applied load force is 30-50 min.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, in the step Sa2, 100mL-200mL of iron ore powder to be measured is taken, the mass of the iron ore powder to be measured is weighed, the iron ore powder to be measured is placed in a measuring cylinder with the diameter of 20mm and the volume of 200mL, the iron ore powder to be measured is in a natural stacking state in the measuring cylinder, and the initial density of the iron ore powder to be measured is calculated.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, in the step Sb1, the drying temperature is 105-120 ℃, and the drying time is 3-5 h.
In step Sb2, the water saturation state is that water is added dropwise into a container containing iron ore powder to be measured, and the dropwise addition is stopped when a solid-liquid separation interface just appears, and the mixture is left for 1 hour, and if the solid-liquid separation state does not change, the mixture is considered to reach the water saturation state; if the solid-liquid separation state changes, the process is repeated until the solid-liquid separation state is not changed.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, in the step Sb3, the drying temperature is 105-120 ℃, and the drying time is 3-5 h.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, the iron ore powder is any one of magnetite and hematite.
As an improvement of the powder characteristic characterization method in the iron ore powder pelletizing process, the particle size distribution of the iron ore powder is more than 40 meshes.
As an improvement of the characterization method of the powder characteristics in the iron ore powder pelletizing process, the volume change characteristics and the water holding characteristics of the iron ore powder are measured according to the characterization method of the powder characteristics in the iron ore powder pelletizing process; the compression strength and the falling strength value of the iron ore powder green pellets with different volume change characteristics and water retention characteristics are compared, and the influence of the difference of the volume change characteristics and the water retention characteristics on the compression strength and the falling strength of the green pellets is researched.
(III) advantageous effects
The invention has the beneficial effects that:
by providing a characterization method of the variable characteristics and the water retention characteristics of the iron ore powder, related physical property data of the iron ore powder are obtained; the quality of the green pellets of the pellet can be evaluated and estimated according to related physical property data by researching the influence of the variable property and the water holding property of the iron ore powder on the green pellets of the pellet; meanwhile, the invention also correspondingly supplements the iron ore powder characteristic evaluation system. Therefore, the method has important theoretical and practical significance for fully representing the powder bulk variation characteristic and the water retention characteristic and exploring the relation between the powder bulk variation characteristic and the water retention characteristic and the green pellet quality of the pellet ore and improving the production efficiency of the pellet ore and the quality of the pellet ore.
Drawings
The invention is described with the aid of the following figures:
FIG. 1 is a schematic view of an iron ore powder compression test apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of an iron ore powder compression test apparatus according to an embodiment of the present invention;
FIG. 3 is a line graph showing the change in density before and after compression of a test sample in example 1 of the present invention;
FIG. 4 is a bar graph showing the change in volume of the test sample before and after compression in example 1 of the present invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
The selected iron ore powder is from magnetite, and the chemical components of the magnetite are shown in the table 1. In this example, three ore powders of different size fraction levels were obtained by screening the selected iron ore powders. Wherein the sample is named as a tested sample 1 with the particle size distribution of 40-200 meshes; the sample 2 is named as a tested sample with the particle size distribution of 200-300 meshes; the sample 3 designated as tested had a particle size distribution of less than 300 mesh.
Table 1 example 1 chemical composition of iron ore powder (mass%,%)
(1) Volume change property of iron ore powder
S1, placing the sample to be tested in a drying oven for drying at the temperature of 110 ℃ for 4h to obtain the iron ore powder to be tested. Drying makes the tested product remove all free water, i.e. the drying process is not weightless.
S2, as shown in FIG. 1, 100mL (V)1) Weighing the mass (m) of the iron ore powder to be measured, placing the iron ore powder to be measured into a measuring cylinder with the diameter of 20mm and the volume of 200mL, enabling the iron ore powder to be measured to be in a natural accumulation state in the measuring cylinder, and calculating the initial density rho of the iron ore powder1＝m/V1。
S3, applying a force of 20N to the iron ore powder to be measured in the measuring cylinder for compression for 40min, and recording the compression volume (V) of the compressed iron ore powder2) And calculating the compressed density ρ thereof2＝m/V2。
S4, respectively calculating the volume change (delta V-V) of the iron ore powder to be measured1-V2) And density variation (Δ ρ ═ ρ)2-ρ1＝m/V2-m/V1) (ii) a And obtaining the volume change characteristic data of the iron ore powder. By calculating the volume change and the density change, the process of mineral powder balling and compacting can be better represented, namely the volume change characteristic is better represented.
The volume change characteristic data of the samples with different particle size distributions are shown in Table 2
TABLE 2100 mL volume change characteristics of iron ore powders of different particle sizes
As shown in fig. 3, a line graph of the density change before and after compression of the test sample, and as shown in fig. 4, a bar graph of the volume change before and after compression of the test sample, it can be seen that the smaller the particle size distribution of the test sample, the larger the change amount of the volume and the density, and the more easily the test sample becomes dense.
(2) Water-holding property of iron ore powder
S1, placing the sample to be tested in a drying oven for drying at the temperature of 110 ℃ for 4h to obtain the iron ore powder to be tested.
S2, as shown in FIG. 2, taking 10mL of iron ore powder to be measured, and weighing the mass (m)0) Then placing the iron ore powder into a measuring cylinder with the volume of 20mL, dropwise adding water into a container containing the iron ore powder to be measured, stopping dropwise adding until a solid-liquid separation interface just appears, standing for 1h, and considering that the iron ore powder reaches a water saturation state at the moment if the solid-liquid separation state does not change; if the solid-liquid separation state changes, repeating the above process until the solid-liquid separation state does not change, obtaining iron ore powder in water saturation state, and measuring the total mass (m) of the iron ore powder in water saturation state and the measuring cylinder1)。
S3, placing the measuring cylinder filled with the iron ore powder in the water saturation state in an oven for drying at the drying temperature of 110 ℃ for 4h, and measuring the total mass (m) of the dried iron ore powder and the container2)。
S4, calculating the saturated water content (w ═ m) of the iron ore powder to be measured1-m2)/m0) And obtaining the water holding characteristic data of the iron ore powder.
In step S2, the solid-liquid separation state means that water is no longer immersed in the ore powder to be measured, excess water floats on the ore powder to be measured, and the solid-liquid separation interface means a contact surface between the excess water and the ore powder to be measured.
The water holding characteristic data of the test samples with different particle size distributions are shown in Table 3
TABLE 3 Water holding Properties of iron ore powders of different particle sizes
(3) Influence of iron ore powder variable property and water holding property on pellet quality
The green pellet compression strength and drop strength results obtained when pellets were prepared from the three test samples of this example are shown in table 4.
TABLE 4 relationship between the variable and water holding properties of iron ore powder of different particle sizes and the green pellet quality
As can be seen from Table 4, when the volume change rate Δ V of the iron ore powder is more than 10% and the density change rate Δ ρ is more than 15% (volume change characteristics), the pellet green pellet has better strength; when the saturated water content w of the mineral powder is more than 10 percent (water holding characteristic), the mineral powder can be ensured to have better affinity with water, and then better balling performance is obtained. In addition, the volume change characteristic and the water retention characteristic of the iron ore powder are related to the particle size of the iron ore powder, and the green ball quality and the balling efficiency can be improved by reducing the particle size of the iron ore powder. The volume change characteristic of the iron ore powder has an obvious effect of improving the green pellet strength, the quality of the ore powder such as the compression strength and the falling strength of the green pellets can be controlled by controlling the volume change characteristic of the ore powder, the control on the water retention characteristic can influence the water content of the raw materials and the addition amount of water in the pelletizing process, and the regulation effect is achieved.
Example 2
Two kinds of iron ore powder are selected and respectively come from magnetite and hematite, and the chemical components of the two kinds of iron ore powder are shown in a table 5. In this example, 80.11% magnetite powder with a particle size distribution of 200 mesh or less and 83.57% hematite powder with a particle size distribution of 200 mesh or less were used, the magnetite powder was named as iron ore powder 1 and the hematite powder was named as iron ore powder 2, and then, two kinds of raw materials were used for pelletizing, and the compressive strength and the falling strength of green pellets were measured.
Table 5 chemical composition of iron ore powder of example 2 (mass%,%)
(1) Volume change characteristics of two kinds of iron ore powder
S1, placing the iron ore powder in a drying box to be dried, wherein the drying temperature is 120 ℃, and the drying time is 3 hours, so as to obtain the iron ore powder to be detected.
S2, as shown in FIG. 1, 100mL (V)1) Weighing the mass (m) of the iron ore powder to be measured, placing the iron ore powder to be measured into a measuring cylinder with the diameter of 20mm and the volume of 200mL, enabling the iron ore powder to be measured to be in a natural accumulation state in the measuring cylinder, and calculating the initial density rho of the iron ore powder1＝m/V1。
S3, applying 25N force to the iron ore powder to be measured in the measuring cylinder for compression, lasting for 30min, and recording the compression volume (V) of the compressed iron ore powder2) And calculating the compressed density ρ thereof2＝m/V2。
S4, calculating the volume change rate (Δ V ═ V) of the iron ore powder to be measured1-V2)/V1) And density change rate (Δ ρ ═ ρ (ρ ═ ρ)2-ρ1)/ρ1) (ii) a And obtaining the volume change characteristic data of the iron ore powder.
The volume change characteristics of the two iron ore powders are shown in Table 6
TABLE 6 relationship between the variation and water holding characteristics of two kinds of iron ore powder and the green pellet quality
(2) Water holding property of two kinds of iron ore powder
S1, placing the sample to be tested in a drying oven for drying at 120 ℃ for 3h to obtain the iron ore powder to be tested.
S2, as shown in FIG. 2, taking 10mL of iron ore powder to be measured, and weighing the mass (m)0) Then placing the iron ore powder into a measuring cylinder with the volume of 20mL, dropwise adding water into a container containing the iron ore powder to be measured, stopping dropwise adding until a solid-liquid separation interface just appears, standing for 1h, and if the solid-liquid separation state does not changeThe formation is that the water saturation state is reached at the moment; if the solid-liquid separation state changes, repeating the above process until the solid-liquid separation state does not change, obtaining iron ore powder in water saturation state, and measuring the total mass (m) of the iron ore powder in water saturation state and the measuring cylinder1)。
S3, placing the measuring cylinder filled with the iron ore powder in the water saturation state in an oven for drying at 105 ℃ for 5h, and measuring the total mass (m) of the dried iron ore powder and the container2)。
S4, calculating the saturated water content (w ═ m) of the iron ore powder to be measured2-m1)/m0) And obtaining the water holding characteristic data of the iron ore powder.
TABLE 7 Water holding Properties of two iron ore powders
(3) Influence of variable characteristics and water retention characteristics of two iron ore powders on quality of pellets
TABLE 8 Water holding Properties of two iron ore powders
As can be seen from table 8, under the same granulation conditions, the bulk transformation characteristics of the ore powder 2 are high (the volume change rate can reach 2.5%), and the water retention characteristics are high (the saturated water content w can reach 15.73%), that is: the volume change property and the water retention property of the mineral powder 2 are superior to those of the mineral powder 1, so the compressive strength and the falling strength of green pellets corresponding to the mineral powder 2 are superior to those of the mineral powder 1.
The invention provides a method for representing the variable characteristics and the water retention characteristics of iron ore powder, researches the influence of the variable characteristics and the water retention characteristics of the iron ore powder on the quality of the iron ore pellets, can evaluate and estimate the quality of the iron ore pellets according to the influence, and has important theoretical and practical significance.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (8)
1. A characterization method for powder characteristics in an iron ore powder pelletizing process is characterized in that the powder characteristics in the iron ore powder pelletizing process comprise a volume change characteristic and a water retention characteristic, and the characterization of the volume change characteristic comprises the following steps:
sa1, drying the iron ore powder to obtain iron ore powder to be detected; the drying temperature is 105-120 ℃, and the drying time is 3-5 h;
sa2, measuring initial volume V of iron ore powder to be measured1And initial density ρ1Then applying load force to the iron ore powder to be measured to compress the iron ore powder, and measuring the compression volume V of the iron ore powder2And a compressed density ρ2(ii) a The applied load force is 10-30N, and the duration of the applied load force is 30-50 min;
sa3, calculating the volume change rate △ V (V) of the iron ore powder to be measured1-V2)/V1And a density change rate △ ρ ═ ([ ρ ])2-ρ1)/ρ1△ V and △ rho are used for representing the iron ore powder deformation characteristics;
the characterization of the water retention characteristics comprises the steps of:
sb1, drying iron ore powder to obtain iron ore powder to be detected;
sb2, measuring initial mass m of iron ore powder to be measured0Then placing the iron ore powder into a container, adding water into the container filled with the iron ore powder to be measured in a dropwise manner to obtain the iron ore powder in a water saturation state, and measuring the total mass m of the iron ore powder in the water saturation state and the container1；
Sb3, drying the iron ore powder in the water saturation state and a container to obtain dried iron ore powder, and measuring the total mass m of the dried iron ore powder and the container2；
Sb4, calculating the saturated water content w ═ m of the iron ore powder to be measured1-m2)/m0And w is used for characterizing the water retention property of the iron ore powder.
2. The characterization method of the powder characteristics in the iron ore powder pelletizing process according to claim 1, characterized in that:
in the step Sa2, 100mL-200mL of iron ore powder to be measured is taken, the mass of the iron ore powder is weighed, the iron ore powder to be measured is placed in a measuring cylinder with the diameter of 20mm and the volume of 200mL, the iron ore powder to be measured is in a natural stacking state in the measuring cylinder, and the initial density of the iron ore powder is calculated.
3. The characterization method of the powder characteristics in the iron ore powder pelletizing process according to claim 1, characterized in that:
in the step Sb1, the drying temperature is 105-120 ℃, and the drying time is 3-5 h.
4. The method for characterizing powder characteristics in the iron ore powder pelletizing process as claimed in claim 1, wherein,
in step Sb2, the water saturation state is that water is dripped into a container containing iron ore powder to be detected, the dripping is stopped when a solid-liquid separation interface happens, the mixture is kept stand for 1 hour, and if the solid-liquid separation state does not change, the mixture is considered to reach the water saturation state; if the solid-liquid separation state changes, the process is repeated until the solid-liquid separation state is not changed.
5. The characterization method of the powder characteristics in the iron ore powder pelletizing process according to claim 1, characterized in that:
in the step Sb3, the drying temperature is 105-120 ℃, and the drying time is 3-5 h.
6. The method for characterizing powder characteristics in the process of pelletizing iron ore powder according to any one of claims 1 to 5, wherein the method comprises the following steps:
the iron ore powder is any one of magnetite and hematite.
7. The method for characterizing powder characteristics in the process of pelletizing iron ore powder according to any one of claims 1 to 5, wherein the method comprises the following steps:
the particle size distribution of the iron ore powder is more than 40 meshes.
8. The application of the iron ore powder variable property and the water holding property in the iron ore pellet is characterized in that:
measuring the volume change characteristic and the water retention characteristic of the iron ore powder according to the characterization method of the powder characteristics in the iron ore powder pelletizing process of any one of claims 1 to 7;
the compression strength and the falling strength value of the iron ore powder green pellets with different volume change characteristics and water retention characteristics are compared, and the influence of the difference of the volume change characteristics and the water retention characteristics on the compression strength and the falling strength of the green pellets is researched.
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