CN111437983A - Method for efficiently activating pellet iron concentrate through high-pressure roller milling - Google Patents

Method for efficiently activating pellet iron concentrate through high-pressure roller milling Download PDF

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CN111437983A
CN111437983A CN202010146060.XA CN202010146060A CN111437983A CN 111437983 A CN111437983 A CN 111437983A CN 202010146060 A CN202010146060 A CN 202010146060A CN 111437983 A CN111437983 A CN 111437983A
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iron ore
ore concentrate
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concentrate
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CN111437983B (en
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范晓慧
甘敏
陈许玲
季志云
黄晓贤
高志勇
袁礼顺
王殊
汪国靖
邢金鑫
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Central South University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract

The invention discloses a method for efficiently activating pelletized iron concentrate by a high-pressure roller mill. The method aims at iron ore concentrates with different properties, and parameters such as high-pressure roller milling pressure, power consumption and the like which are suitable for the iron ore concentrates are quickly and accurately determined, so that the purposes of iron ore concentrate granularity refinement and lattice activation are achieved under the condition of efficiently utilizing the energy consumption of the high-pressure roller milling. In the method, in the process of high-pressure roll milling of iron ore concentrate, the milling energy consumption and the change of the specific surface area of the iron ore concentrate under different roll milling pressure conditions are obtained through testing, a relational expression between the increment of the specific surface area and the energy consumption of the high-pressure roll milling is established, influence factors such as the type and the granularity of the iron ore concentrate are considered, a proper roll milling pressure model is established, the optimal roll milling pressure is obtained, the granularity refinement and the lattice activation of the iron ore concentrate are ensured to be realized under the condition that the energy consumption of the high-pressure roll milling is efficiently utilized, the balling performance and the consolidation performance of the iron ore concentrate are greatly improved, the consumption of bentonite is reduced, and the.

Description

Method for efficiently activating pellet iron concentrate through high-pressure roller milling
Technical Field
The invention relates to a method for activating pellet iron ore concentrate by a high-pressure roller mill, in particular to a method for realizing efficient activation and refinement of iron ore concentrate under the condition of ensuring efficient utilization of energy consumption of the high-pressure roller mill by controlling parameters such as roller mill pressure in the high-pressure roller mill process, and belongs to the field of iron ore pellet preparation in ferrous metallurgy.
Background
The iron ore oxidized pellet is a high-quality iron-making furnace charge, and has the advantages of uniform particle size, high cold-state compression strength, high wear resistance, good reduction metallurgical performance and the like. The oxidized pellet ore and the high-alkalinity sintering ore are used in a matching way, so that the effects of increasing yield, saving coke and reducing cost are achieved for blast furnace smelting, and the oxidized pellet ore is considered as a reasonable blast furnace burden structural mode. The productivity of the pellet ore in China is increased year by year, and the production of the high-quality pellet ore is emphasized by various iron and steel enterprises.
With the reduction of the reserve of high-quality magnetite, the use amount of iron ore resources such as hematite, specularite, vanadium-titanium magnetite and the like with poor balling performance and roasting performance is increased year by year, and the problems of low iron grade, coarse granularity, poor balling performance, high preheating and roasting temperature, high energy consumption and the like of raw materials in the production of the pellets are solved, so that the main trend of the production development of the iron ore pellets is realized by reasonably utilizing various iron ore resources, improving the balling performance of iron ore concentrate and the iron grade of the pellets, improving the consolidation and metallurgical performance of the pellets and saving energy and reducing consumption in the production process.
The high-pressure roller grinding is adopted to change the properties of granularity, specific surface area, shape, hydrophilicity and the like of iron ore concentrate particles, can improve the balling performance and the consolidation performance of the iron ore concentrate, and is an important measure for preparing high-quality pellets. Through the treatment of the high-pressure roller mill, fine iron powder particles are mutually extruded and crushed to generate a plurality of fine-grained particles, the fine iron powder has fine granularity and the specific surface area is increased. In addition, when the pressure is raised to a certain degree, lattice distortion and crystal block size reduction also occur, so that the surface energy and free energy of the material are increased, the activation energy of the consolidation reaction is reduced, the activity is enhanced, and the balling performance of the iron ore concentrate and the consolidation capability of the iron ore concentrate can be improved. High-pressure roller milling is widely adopted by pelletizing plants at home and abroad to pretreat iron ore concentrate, so that a good industrial production effect is obtained, and practice shows that the high-pressure roller milling has the effects of obviously improving the quality of iron ore pellets, reducing energy consumption, improving productivity and the like.
When the roller grinding pressure is high to a certain degree, the crushing effect on the iron ore concentrate is reduced along with the increase of the roller pressure, at the moment, the variation amplitude of the granularity and the specific surface area of the iron ore concentrate is obviously slowed down, the excessive energy consumption is converted into lattice energy storage, the activity of the iron ore concentrate is continuously increased, and the balling performance and the consolidation performance can be further improved; however, if the pressure on the roller is continuously increased, the activity of the iron ore concentrate is not obviously improved, and even agglomeration is generated among particles, so that the apparent granularity of the particles becomes coarse, the unit ore grinding energy consumption is sharply increased, the abrasion degree of the surface of the pressing roller is increased, and obviously, the increase of the pressure on the roller is unreasonable in the aspect of economical efficiency. Therefore, the proper rolling and the corresponding ore grinding power consumption are determined, so that the iron ore concentrate achieves better fine grinding effect and lattice activation effect, and the method has important significance for reducing the comprehensive energy consumption of two procedures of iron ore concentrate crushing and pellet consolidation.
Then, when the iron ore concentrates with different particle sizes and properties are treated by the high-pressure roller mill, the suitable fine grinding degrees of the iron ore concentrates are different, the requirements on the lattice activation degrees are also different, the suitable parameters of the high-pressure roller mill, such as pressure, power consumption and the like, can be determined only by the high-pressure roller mill test of the iron ore concentrates, a large amount of experimental researches on pelletizing, roasting and the like of the iron ore concentrates obtained after the roller mill are carried out, even the pellet industrial test is carried out, the ductility of the test result is poor, the properties of the raw materials are slightly changed, the high-pressure roller mill test and the pellet test need to be repeatedly carried out, and the consumption of manpower and material resources is large, so that the requirements.
Disclosure of Invention
The invention aims to provide a method for efficiently activating pelletized iron ore concentrate by high-pressure roller milling, which can quickly and accurately determine the appropriate range values of the parameters such as roller milling pressure, power consumption and the like for different types of iron ore concentrates, ensure that the granularity refinement and lattice activation of the iron ore concentrate are realized under the condition of high-pressure roller milling energy consumption efficient utilization, greatly improve the pelletizing performance and the consolidation performance of the iron ore concentrate, reduce the consumption of bentonite and reduce the roasting energy consumption of the pellets, and further realize the efficient production of the pellets.
In order to realize the technical purpose, the invention provides a method for efficiently activating pelletized iron concentrate by high-pressure roller millingIs suitable for，
Figure BDA0002400762550000021
Figure BDA0002400762550000022
PIs suitable forThe unit is MPa;
wherein, PminIs composed of
Figure BDA0002400762550000023
In the graph relating to the pressure P of the roller mill,
Figure BDA0002400762550000024
taking the corresponding pressure at the minimum value;
a is a value related to the type of the iron ore concentrate, the value range of a is x × 0.8.8 + y × 1.0.0 + z × 1.4.4, x, y and z are mass ratios of magnetite, hematite and specularite in the iron ore concentrate in sequence, the selection ranges of x, y and z are 0-1, and x + y + z is 1;
S0the specific surface area of the iron concentrate before high-pressure roller milling is m2/t；
SpThe specific surface area of the iron ore concentrate after high-pressure roller grinding at the roller grinding pressure P is m2/t；
D0The average particle size of the iron ore concentrate before high-pressure roller grinding is in the unit of mu m;
Qpenergy consumption, Q, consumed for treating each ton of iron ore concentrate for different roller milling pressures PpThe unit is KJ/t.
According to the preferable scheme, in the process of high-pressure roll grinding of the iron ore concentrate, the change of the specific surface area of the iron ore concentrate under different roll grinding pressures P is measured, so that the relation between the newly increased specific surface area of the iron ore concentrate and the energy consumption of the high-pressure roll grinding under different roll grinding pressures P is obtained, and meanwhile, factors of the type and the granularity of the iron ore concentrate are considered, and a model suitable for the roll grinding pressure is established.
According to the preferable scheme, in the high-pressure roll grinding process of the iron ore concentrate, the energy consumption Q consumed by each ton of iron ore concentrate of roll grinding under the condition of different roll grinding pressures P is measuredpAnd obtaining the corresponding relation between Qp and the rolling pressure.
Preferably, the specific surface area S of the iron concentrate before the iron concentrate is rolled is measured in the high-pressure roll milling process of the iron concentrate0And the specific surface area S of the iron ore concentrate after being rolled by different rolling pressures PpCalculating the increment S of the specific surface area of each ton of iron concentrate before and after the roller millingP－S0And obtaining the corresponding relation between the specific surface area increment and the roller grinding pressure P.
According to the method for efficiently activating the pellet iron ore concentrate by the high-pressure roller mill, the proper roller mill pressure and the ore grinding power consumption range can be determined only by measuring the change of the iron ore concentrate granularity and the change rule of the iron ore concentrate along with the change of the roller mill pressure and the ore grinding energy consumption in the high-pressure roller mill process without carrying out a large number of pellet tests, the iron ore concentrate with the proper specific surface area and the proper lattice activation can be obtained, the pelletizing performance and the consolidation performance of the iron ore concentrate can be greatly improved, the consumption of bentonite can be reduced, and the pellet roasting energy consumption can be reduced.
The average particle size of the iron ore concentrate is measured by a laser diffraction scattering particle size analyzer: absolute ethyl alcohol is used as a dispersing agent, the particle size distribution of the iron ore concentrate is measured in an ultrasonic dispersion environment, and the average particle size D of the iron ore concentrate before high-pressure roller grinding is obtained0The average particle diameter is in μm.
The specific surface area of the iron concentrate is measured by an electric Boehringer's air permeability specific surface area measuring instrument according to the Boehringer's method (GB/T8074-2008).
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
(1) according to the technical scheme, the proper parameters such as the roller milling pressure, the ore milling energy consumption and the like can be determined only by measuring the change along with the roller milling pressure and the ore milling power consumption and the change rule of the iron ore concentrate granularity and the surface energy, so that a large amount of pellet tests are not required to be carried out, and the method has the characteristics of quickness and high efficiency;
(2) according to the proper high-pressure roller milling method provided by the technical scheme of the invention, the granularity characteristic D of the iron ore concentrate is considered, the type of the iron-containing minerals of the iron ore concentrate is considered, and the adaptability and the ductility are strong;
(3) according to the technical scheme, the obtained iron ore concentrate has a higher specific surface area and contains moderate lattice energy storage by controlling the proper roller grinding pressure and ore grinding power consumption, so that the problems that the roller grinding pressure selection is too low, the roller grinding effect cannot be exerted, the roller grinding pressure selection is too high and the ore grinding energy consumption is wasted are avoided.
Therefore, the technical scheme of the invention enables the iron ore concentrate to have high activity under the condition of controlling ore grinding energy consumption, and compared with the iron ore concentrate without high-pressure roller grinding, the proportioning of the bentonite can be reduced by 0.5-1% under the condition of proper high-pressure roller grinding parameters, the balling rate is improved by 5-20%, the preheating temperature is reduced by 50-120 ℃, the roasting temperature is reduced by 30-100 ℃, and the energy consumption of the balling is reduced by 2-5 kgce.
Drawings
FIG. 1 shows the results of example 1
Figure BDA0002400762550000041
Graph with P.
Detailed Description
The following specific examples are intended to further illustrate the present disclosure, but not to limit the scope of the claims.
Example 1:
aiming at specularite A, detecting by using a laser particle size analyzer to obtain the average particle diameter D of specularite A0A specific surface area S of 55 μm measured by the Boehringer method0Is 7.52 × 104m2T (see table 1), and the corresponding relation between the power consumption per ton of ore Qp and P and the specific surface area increment (S) are obtained through high-pressure roll milling tests under different roll milling pressures Pp-S0) The correspondence with P (see Table 2); by making
Figure BDA0002400762550000042
Curve form of P and quadratic fit (see fig. 1) to obtain
Figure BDA0002400762550000043
The Pmin at which the minimum value is achieved is 2.7MPa, so the suitable rolling pressure:
Figure BDA0002400762550000044
Figure BDA0002400762550000045
the high-pressure roller milling of the specularite A by adopting the roller milling pressure can obtain the best roller milling effect, compared with pellets which are not subjected to roller milling, when the specularite A is processed under the condition of the suitable roller milling pressure, the proportion of bentonite is reduced by 0.8-1% during pelletizing, the pelletizing rate is improved by 16-20%, the preheating temperature of the pellets is reduced by 100-120 ℃, the roasting temperature is reduced by 80-100 ℃, and the energy consumption of the pellets is reduced by 4.6-5 kgce.
Comparative example 1: by adopting the specularite A, when the roller milling pressure of 2.5MPa is adopted, the pressure is too small, the proportioning of the bentonite during pelletizing can be only reduced by 0.5 percent, the pelletizing rate is only improved by 8 percent, the preheating temperature of the pellets is only reduced by 50 ℃, the roasting temperature is only reduced by 40 ℃, and the energy consumption of the pellets is only reduced by 2.2 kgce.
Comparative example 2: by adopting the specularite A, when the rolling pressure of 3.5MPa is adopted, the pressure is overlarge, the proportioning of bentonite is reduced by 0.7 percent during pelletizing, the pelletizing rate is improved by 12 percent, the preheating temperature of pellets is reduced by 80 ℃, the roasting temperature is reduced by 60 ℃, the roasted pellets easily form a shell structure, the energy consumption of the pellets is only reduced by 3.2kgce, and the power consumption of the high-pressure rolling mill is obviously increased compared with that of the high-pressure rolling mill when the pressure is proper.
TABLE 1 pressure ranges for suitable roller mills for different iron concentrates
Figure BDA0002400762550000051
TABLE 2 Qp, (S)p-S0) Corresponding relation with P
Figure BDA0002400762550000052
Example 2
Aiming at hematite A, detecting by adopting a laser particle size analyzer to obtain the average particle size D0A specific surface area S of 46 μm as measured by the Boehringer method0Is 13.34 × 104m2T (see table 1), and the corresponding relation between the power consumption per ton of ore Qp and P and the specific surface area increment (S) are obtained through high-pressure roll milling tests under different roll milling pressures Pp-S0) A correspondence with P; by making
Figure BDA0002400762550000053
Performing quadratic fitting with the curve chart of P to obtain
Figure BDA0002400762550000054
The Pmin at which the minimum value is achieved is 2.3MPa, so the suitable rolling pressure:
Figure BDA0002400762550000061
Figure BDA0002400762550000062
compared with pellets which are not subjected to roll milling, the hematite A is treated under the condition of suitable roll milling pressure, the proportion of bentonite is reduced by 0.6-1.0% during pelletizing, the pelletizing rate is improved by 12-15%, the preheating temperature of the pellets is reduced by 70-100 ℃, the roasting temperature is reduced by 40-50 ℃, and the energy consumption of the pellets is reduced by 2.7-3.3 kgce.
Example 3
Aiming at the magnetite A, detecting by a laser particle size analyzer to obtain the average particle diameter D0A specific surface area S of 42 μm measured by the Boehringer method0Is 15.61 × 104m2T (see table 1), and the corresponding relation between the power consumption per ton of ore Qp and P and the specific surface area increment (S) are obtained through high-pressure roll milling tests under different roll milling pressures Pp-S0) A correspondence with P; by making
Figure BDA0002400762550000063
Performing quadratic fitting with the curve chart of P to obtain
Figure BDA0002400762550000064
The Pmin at which the minimum value is obtained is 2.1MPa, so the suitable rolling pressure:
Figure BDA0002400762550000065
Figure BDA0002400762550000066
compared with pellets which are not subjected to roll milling, the magnetite A is processed under the condition of suitable roll milling pressure, the proportion of bentonite is reduced by 0.5-0.6% during pelletizing, the pelletizing rate is improved by 5-8%, the preheating temperature of the pellets is reduced by 50-60 ℃, the roasting temperature is reduced by 30-40 ℃, and the energy consumption of the pellets is reduced by 2-2.5 kgce.
Example 4
For 50% magnetite A + 50% hematiteThe mixed iron concentrate of the iron ore A is detected by a laser particle size analyzer to obtain the average particle size D0A specific surface area S of 44 μm measured by the Boehringer method0Is 14.50 × 104m2T (see table 1), and the corresponding relation between the power consumption per ton of ore Qp and P and the specific surface area increment (S) are obtained through high-pressure roll milling tests under different roll milling pressures Pp-S0) A correspondence with P; by making
Figure BDA0002400762550000067
Performing quadratic fitting with the curve chart of P to obtain
Figure BDA0002400762550000068
The Pmin at which the minimum value is achieved is 2.2MPa, so the suitable rolling pressure:
Figure BDA0002400762550000069
compared with pellets which are not subjected to roll milling, the mixed ore is processed under the condition of suitable roll milling pressure, the proportion of bentonite is reduced by 0.5-0.8% during pelletizing, the pelletizing rate is improved by 10-13%, the preheating temperature of the pellets is reduced by 60-80 ℃, the roasting temperature is reduced by 30-50 ℃, and the energy consumption of the pellets is reduced by 2.2-2.5 kgce.
Example 5
Aiming at the mixed iron concentrate of 70 percent of magnetite A, 20 percent of hematite A and 10 percent of specularite A, detecting by a laser particle size analyzer to obtain the average particle size D0A specific surface area S of 43 μm measured by the Boehringer method0Is 14.32 × 104m2T (see table 1), and the corresponding relation between the power consumption per ton of ore Qp and P and the specific surface area increment (S) are obtained through high-pressure roll milling tests under different roll milling pressures Pp-S0) A correspondence with P; by making
Figure BDA0002400762550000071
Performing quadratic fitting with the curve chart of P to obtain
Figure BDA0002400762550000072
The Pmin at which the minimum value is achieved is 2.4MPa, so the suitable rolling pressure:
Figure BDA0002400762550000073
compared with pellets which are not subjected to roll milling, the mixed ore is processed under the condition of suitable roll milling pressure, the proportion of bentonite during pelletizing is reduced by 0.5-0.7%, the pelletizing rate is improved by 11-14%, the preheating temperature of the pellets is reduced by 50-70 ℃, the roasting temperature is reduced by 30-50 ℃, and the energy consumption of the pellets is reduced by 2.2-2.6 kgce.

Claims (4)

1. A method for efficiently activating pellet iron ore concentrate by high-pressure roller milling is characterized by comprising the following steps: controlling the rolling pressure P to be P in the high-pressure rolling process of the iron ore concentrateIs suitable for，
Figure FDA0002400762540000011
PIs suitable forThe unit is MPa;
wherein, PminIs composed of
Figure FDA0002400762540000012
In the graph relating to the pressure P of the roller mill,
Figure FDA0002400762540000013
taking the corresponding pressure at the minimum value;
a is a value related to the type of the iron ore concentrate, the value range of a is x × 0.8.8 + y × 1.0.0 + z × 1.4.4, x, y and z are mass ratios of magnetite, hematite and specularite in the iron ore concentrate in sequence, the selection ranges of x, y and z are 0-1, and x + y + z is 1;
S0the specific surface area of the iron concentrate before high-pressure roller milling is m2/t；
SpThe specific surface area of the iron ore concentrate after high-pressure roller grinding at the roller grinding pressure P is m2/t；
D0The average particle size of the iron ore concentrate before high-pressure roller grinding is in the unit of mu m;
Qpenergy consumption, Q, consumed for treating each ton of iron ore concentrate for different roller milling pressures PpThe unit is KJ/t.
2. The method for high-efficiency activation of pelletized iron concentrate by high-pressure roller milling according to claim 1, characterized in that: in the process of high-pressure roll milling of the iron ore concentrate, the change of the specific surface area of the iron ore concentrate under different roll milling pressures P is measured so as to obtain the relationship between the new specific surface area of the iron ore concentrate under different roll milling pressures P and the energy consumption of the high-pressure roll milling, and meanwhile, the type and granularity factors of the iron ore concentrate are considered, so that a model suitable for the roll milling pressure is established.
3. The method for high-efficiency activation of pelletized iron concentrate by high-pressure roller milling according to claim 1, characterized in that: in the high-pressure roll milling process of the iron ore concentrate, the energy consumption Q consumed by each ton of iron ore concentrate of roll milling under different roll milling pressures P is measuredpAnd obtaining the corresponding relation between Qp and the rolling pressure.
4. The method for high-efficiency activation of pelletized iron concentrate by high-pressure roller milling according to claim 1, characterized in that: in the high-pressure roll grinding process of iron ore concentrate, the specific surface area S of the iron ore concentrate before roll grinding is measured0And the specific surface area S of the iron ore concentrate after being rolled by different rolling pressures PpCalculating the increment S of the specific surface area of each ton of iron concentrate before and after the roller millingP－S0And obtaining the corresponding relation between the specific surface area increment and the roller grinding pressure P.
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