CN111363916B - Method for determining rotating speed of sintering granulator - Google Patents
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- CN111363916B CN111363916B CN202010389271.6A CN202010389271A CN111363916B CN 111363916 B CN111363916 B CN 111363916B CN 202010389271 A CN202010389271 A CN 202010389271A CN 111363916 B CN111363916 B CN 111363916B
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- 238000005245 sintering Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 claims abstract description 52
- 238000005469 granulation Methods 0.000 claims abstract description 32
- 230000003179 granulation Effects 0.000 claims abstract description 30
- 230000014509 gene expression Effects 0.000 claims abstract description 7
- 239000002023 wood Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 5
- 244000089409 Erythrina poeppigiana Species 0.000 claims description 4
- 235000009776 Rathbunia alamosensis Nutrition 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 13
- 238000004364 calculation method Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007771 core particle Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 flux Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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Abstract
The invention belongs to the field of granulation and sintering, and particularly relates to a method for determining the rotating speed of a sintering granulator. Under the condition of different sintering production capacities, the appropriate filling rate of the granulator is logically determined, the optional rotating speed range of the granulator is obtained, and the aim of improving the granulating effect of the mixture is fulfilled. And step 1, obtaining the proper filling rate of the granulator according to the sintering design manual and the mixer process design parameters. And 2, determining the repose angle psi of the mixture. Step 3, measuring bulk density rho of the mixture; and 4, obtaining the relation between the granulation time t and the rotating speed n according to the functional relation between the granulation time t and the rotating speed n. And 5, obtaining the relation between the filling rate phi and the production capacity Q and the granulation time t according to the functional relation between the filling rate phi and the production capacity Q and the granulation time t. And 6, obtaining a relational expression of the filling rate and the rotating speed of the granulator and the production capacity t/h through the functional relational expression of the step 4 and the step 5, and calculating to obtain the suitable rotating speed range under different production capacities.
Description
Technical Field
The invention belongs to the field of granulation and sintering, and particularly relates to a method for determining the rotating speed of a sintering granulator.
Background
The sintering is a process of proportioning iron ore powder, flux, solid fuel and the like according to a certain proportion, adding water for wetting, uniformly mixing and granulating to form a mixture, then distributing the mixture on a sintering machine, and bonding the mixture into sintered ore under the condition of incomplete melting through a series of physical and chemical changes under the action of high temperature by ignition and forced air draft. The granulator is used for adhering 0.25mm of fine powder in the mixture to 1-3 mm of core particles, so that the granulation effect is enhanced, the air permeability of the mixture is improved, and the quality of sintered minerals is improved.
The proportion of different raw materials is different, and the proportion of adhesive powder and nuclear particles in the mixture is different, and in order to improve the pelletization effect, the rotating speed of the granulator is designed to be adjustable within a certain range, but because of the frequent changes of the raw material proportion, the granularity composition of each raw material and the water adding amount, the factors for improving the pelletization effect are complicated, and the rotating speed of the granulator is rarely adjusted in the sintering production.
Analysis shows that the granulating effect is related to the ratio of adhering powder to core particles in the raw materials on one hand, and more importantly, the movement state of the mixture in a granulator, the rolling movement is favorable for granulating, the turning movement is favorable for uniformly mixing, and the sliding movement is unfavorable for uniformly mixing and granulating. The motion state of the mixture is mainly determined by the rotating speed and the filling rate of the granulator, and if the sintering production capacity is greatly changed without adjusting the rotating speed, the filling rate is not in a proper range, so that the granulation effect is influenced.
The sintering throughput varies greatly in the following production modes. 1) Under the production mode that a steel enterprise has one sintering machine to ensure that a plurality of blast furnaces can supply the needed sintering ore, the sintering capacity is restricted by the blast furnaces, and when the furnace conditions are good and the capacity of the blast furnaces is high, full-load production is required to be sintered, and even the yield is improved. When the furnace condition is poor, the productivity of the blast furnace is low, and sintering is required to limit the production. 2) In order to reduce the powder rate generated by transferring the sinter and improve the effective charging amount, the sintering production is also restricted by a blast furnace under the production mode that the sinter is directly transferred to the blast furnace but not fallen to the ground, or the full load production or the limited production, and the filling rate of a granulator is greatly changed from 1.3 times to 0.5 time of the normal level. 3) Under the normal production condition, the two main exhaust fans of sintering produce, when a main exhaust fan trouble, adopt single main exhaust fan production, then the sintering productivity is normal horizontally 50 ~ 60%. 4) When the blast furnace is overhauled but the sintering is not overhauled, and the frequent starting and stopping of the sintering machine are reduced, a single main exhaust fan production mode is adopted, and the sintering capacity is reduced. 5) In cold areas in winter, the raw material frozen blocks influence the semi-productive energy production of sintering and the like.
Disclosure of Invention
The invention provides a method for determining the rotating speed of a sintering granulator, aiming at overcoming the defects in the prior art, wherein the method is used for logically determining the proper filling rate of the granulator under the condition of sintering with different production capacities, so as to obtain the rotating speed range of an optional granulator and achieve the purpose of improving the granulating effect of a mixture.
In order to achieve the purpose, the invention adopts the following technical scheme that the method comprises the following steps:
step 1, obtaining the appropriate filling rate of the granulator to be 9-13% and the optimal filling rate to be 10-12% according to a sintering design manual and mixing machine process design parameters.
Step 2, determining a mixture repose angle psi; wherein, angle of repose psi indicates that under the mixture natural pile-up state, the hypotenuse and horizontal direction's contained angle, unit: degree.
Step 3, measuring bulk density rho of the mixture; wherein, the bulk density rho refers to the mass number of the mixture in unit volume, unit: t/m3。
Le is the effective length of the granulator, which is a design parameter of the granulator; the unit is m, Le = actual length L-1 m.
De is the effective diameter of the granulator, and the unit is m, De = the actual diameter D-0.1m, which is the design parameter of the granulator.
v is the granulator advancement angle, tan v = sinv = sina ÷ sin ψ; wherein a is the installation inclination angle of the granulator, the unit is DEG, and the design parameter of the granulator is shown; psi is the blend repose angle in units.
And n is the rotating speed of the granulator and the unit is r/min. (provision is made for calculating the appropriate rate of rotation for the appropriate fill factor;).
φ＝［Qt÷（60πRe2le. rho) ] × 100% to obtain the relation between the filling rate phi and the production capacity Q and the granulation time t;
in the formula: phi is the fill factor,%.
Q is the production capacity of the granulator, and the unit is t/h, which is production data.
Re is the effective granulator radius in m, Re = De ÷ 2, the granulator design parameter.
Rho is the bulk density of the mixture and has the unit of t/m3Obtained by measurement.
t is the granulation time in min.
And 6, obtaining a relational expression of the filling rate and the rotating speed of the granulator and the production capacity t/h (batch, sintering capacity) through the functional relational expression of the step 4 and the step 5, and calculating to obtain the suitable rotating speed range under different production capacities.
Further, the filling rate is equal to the percentage of the volume of the mixture to the effective volume of the granulator.
Further, in step 2, the determination method of the mixture repose angle psi comprises the following steps: and naturally dropping the mixture into a shape of a delta isosceles triangle, and measuring an internal included angle between the inclined edge and the bottom edge of the isosceles triangle to obtain the repose angle psi of the mixture.
Further, in step 3, the method for measuring the bulk density ρ of the mixture includes the following steps.
Step 3.1, manufacturing the product with the length, width and height of 0.5m and the volume of 0.125m3The weight G of the wooden box is weighed1The unit: t.
Step 3.2, filling the mixture into the wood box, leveling the material surface by using a batten along the upper edge of the wood box, and weighing the wood box and the mass G of the mixture2The unit: t.
Step 3.3, according to a formula: bulk density of the mixture rho ═ (G)2－G1) And 0.125, and calculating to obtain the bulk density rho of the mixture.
Compared with the prior art, the invention has the beneficial effects.
Under the condition of different sintering production capacities, the proper filling rate of the granulator is determined logically, the optional rotating speed range of the granulator is obtained, and the aim of improving the granulating effect of the mixture is fulfilled.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is an exemplary table of fill fraction calculation values in accordance with the present invention.
FIG. 2 is a table showing an example of the calculated values of the granulation time according to the present invention.
Fig. 3 is an exemplary table of trigonometric values for the installation inclination in fig. 2.
FIG. 4 is an example table of suitable rotation speed ranges under a certain production capacity and a filling rate of 9-13%.
Detailed Description
The quality of the granulating effect of the mixture is mainly determined by the rotating speed and the filling rate of the granulator, the rotating speed and the filling rate are proper, the mixture is in a rolling motion state in the granulator, the twisting granulating effect formed between materials is good, and the granulating is not good when the rotating speed and the filling rate are too large or too small.
According to sintering design manual, production experience data and mixer process design parameters.
The granulator has a suitable filling rate of 9-13% and an optimal filling rate of 10-12%. The method is characterized in that a functional relation among the filling rate, the rotating speed and the production capacity t/h (batch, sintering capacity) of the granulator is obtained through logical calculation, the filling rate is determined to be 9-13%, and a suitable rotating speed range under different production capacities is obtained through calculation, so that the purposes of effectively utilizing the rotating speed of the granulator, improving the granulating effect of a mixture, promoting the sintering of a thick material layer, and achieving high quality, high yield and low consumption are achieved.
The granulator with the diameter of 4.4 multiplied by 20m is arranged with the inclination angle of 1.7 degrees and the bulk density of the mixed material of 1.68 t/m3Taking the mixture repose angle of 37 degrees as an example, a functional relation is deduced: and when the production capacity t/h is 9.75 multiplied by the filling rate% multiplied by the rotating speed r/min, and the calculated filling rate is in a proper range of 9-13% and an optimal range of 10-12%, the rotating speed of the granulator which is suitable for different production capacities is selected.
The method comprises the following specific technical steps: .
1. The sintering theory yields: the granulator has a suitable filling rate of 9-13% and an optimal filling rate of 10-12%.
The filling rate is equal to the percentage of the volume of the mixture in the effective volume of the granulator. The filling rate is calculated from the production capacity and the granulation time.
2. The repose angle psi of the mixture was determined.
The repose angle psi refers to the included angle between the bevel edge and the horizontal direction in the natural stacking state of the mixture, and the unit is as follows: degree.
The determination method comprises the following steps: and naturally dropping the mixture into a shape of a delta isosceles triangle, and measuring an internal included angle between the inclined edge and the bottom edge of the isosceles triangle to obtain the repose angle psi of the mixture.
3. Measurement of bulk Density of mixture ρ
The bulk density ρ is the mass number of the mixture per unit volume, unit: t/m3。
The determination method comprises the following steps: 1) the length, width and height of the product are 0.5m, and the volume is 0.125m3The weight G of the wooden box is weighed1The unit: t. 2) Filling the wood box with the mixture, leveling the charge level with a batten along the upper edge of the wood box, weighing the wood box and the mixture mass G2The unit: t. 3) According to the formula: bulk density of the mixture rho ═ (G)2－G1) And 0.125, and calculating to obtain the bulk density rho of the mixture.
4. The granulation time t as a function of the rotational speed n is expressed by the equation t ═ Le ÷ (π De n tan v).
Wherein t-granulating time, min, is obtained by calculation.
Le- -effective length of granulator, m, Le = actual length L-1m, is a design parameter for the granulator.
De- - -the effective diameter of the granulator, m, De = the actual diameter D-0.1m, is a design parameter of the granulator.
n-granulator speed, r/min, and calculating the appropriate filling rate to obtain the appropriate speed.
v- -granulator advancement angle, tan v = sinv = sina ÷ sin ψ.
a- -granulator installation inclination angle, °, design parameters for the granulator.
ψ - -angle of repose of the mixture, ° is determined.
5. Fill rate phi as a function of throughput Q and granulation time t.
φ＝［Qt÷（60πRe2•Le•ρ）］×100%。
Wherein phi-filling rate,%, is obtained by calculation.
Q- -granulator capacity, t/h, is production data.
t- -granulation time, min, is calculated.
Re- - -effective granulator radius, m, Re = De/2, as a granulator design parameter.
Rho- - - -bulk density of the mixture, t/m3Obtained by measurement.
6. The calculation formulas of the granulation time t with the rotation speed n, the filling rate phi with the production capacity Q and the granulation time t are tabulated as shown in fig. 1 to 3.
Examples are: a granulator with the diameter of 4.4 multiplied by 20m (the diameter is 4.4m, the length is 20 m),the installation inclination angle is 1.7 degrees, and the bulk density of the mixed material is 1.68 t/m3The repose angle of the mixture is 37 degrees.
A certain production capacity value Q is input, the rotating speed n is changed, and different filling rates phi are obtained, and the table 1 shows.
As shown in FIG. 4, the mark red in the example table is the optional rotation speed n corresponding to the appropriate filling rate phi of 9-13% under a certain production capacity Q, and if the production capacity Q is 350t/h, the optional rotation speed n is 4 r/min. The production capacity Q is 550t/h, and the optional rotating speed n is 4.5-6 r/min.
The structure and the working principle of the technology are as follows.
1. The granulator strengthens the working principle of granulation.
Because friction force exists between the mixture and the inner wall of the barrel of the granulator and between the mixture and the barrel of the granulator, under the action of the rotating centrifugal force of the barrel, the mixture is brought to a certain height of the barrel (the height corresponds to the repose angle of the material) and then rolls downwards along the barrel wall, a certain installation inclination angle is formed due to the high inlet and the low outlet of the barrel, the mixture rolls forwards along the axial direction of the barrel of the granulator to form a spiral curve track, the mixture contains 7-8% of physical water, and the purpose of fully wetting, uniformly mixing and granulating the mixture in the rolling process is achieved due to the surface tension of the water and the hydrophilicity of the mixture.
The fill rate is equal to the percentage of the volume of the mix in the granulator to the effective volume of the granulator.
The centrifugal acting force on the mixture is different, the movement tracks in the granulator are different, the movement tracks show three states of sliding, rolling and turning along with the acting force from small to large, and the movement state of the mixture is mainly determined by the filling rate and the rotating speed of the granulator. The filling rate is 9-13%, particularly 10-12%, and under the condition of proper rotating speed, the rolling and twisting motion tracks of the mixture are favorable for strengthening granulation.
2. The technological parameters of the granulator comprise length, rotating speed, installation inclination angle, granulation time and filling rate, wherein the length, the rotating speed and the installation inclination angle are the parameters of the granulator, and the granulation time and the filling rate are calculated according to the following formula.
1）t＝Le÷（πDe·n·tanv）。
Wherein t-granulating time, min.
Le- -effective length of granulator, m, Le = actual length L-1 m.
De- - -effective diameter of granulator, m, De = actual diameter D-0.1 m.
n- -granulator speed, r/min.
v- -granulator advancement angle, tan v = sinv = sina ÷ sin ψ.
a- -granulator mounting inclination angle, °.
ψ - -angle of repose of the mixture, ° is determined.
It can be seen that the granulating time and the rotating speed of the granulator with a certain specification are in inverse proportion, namely the product of the granulating time and the rotating speed is a certain value.
2）φ＝［Qt÷（60πRe2·Le·ρ）］×100%。
Wherein phi-filling rate,%.
Q- -granulator throughput, t/h, i.e.batch.
t- -granulation time, min.
Re- - -granulator effective radius, m, Re = De ÷ 2.
Rho- - - -bulk density of the mixture, t/m3Obtained by measurement.
And (3) integrating the formula 1) and the formula 2) to obtain that the filling rate and the rotating speed of the granulator under a certain specification are in a direct proportional function relationship with the production capacity.
By "YCapacity of production＝f(filling rate. speed of rotation)The functional relation is used for logically determining the appropriate filling rate and rotating speed under the condition of calculating different production capacities of the granulator so as to achieve the purpose of improving the granulating effect of the mixture.
In the production process, the speed-regulating hydraulic coupler is used for connecting the granulator and the speed reducer, and the continuous speed-regulating function of the granulator can be realized by setting the opening degree of the speed-regulating hydraulic coupler oil circuit.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (4)
1. A method of determining the rotational speed of a sintering granulator comprising the steps of:
step 1, obtaining a proper filling rate of 10-12% of a granulator according to a sintering design manual and mixer process design parameters;
step 2, determining a mixture repose angle psi; wherein, angle of repose psi indicates that under the mixture natural pile-up state, the hypotenuse and horizontal direction's contained angle, unit: (iv) DEG;
step 3, measuring bulk density rho of the mixture; wherein, the bulk density rho refers to the mass number of the mixture in unit volume, unit: t/m3；
Step 4, obtaining the relation between the granulation time t and the rotating speed n according to a functional relation formula t of the granulation time t and the rotating speed n, wherein t is Le ÷ (pi De · n · tanv); wherein,
t is the granulation time in min;
le is the effective length of the granulator, which is a design parameter of the granulator; the unit is m, Le = actual length L-1 m;
de is the effective diameter of the granulator, the unit is m, De = the actual diameter D-0.1m, and the De is a design parameter of the granulator;
v is the granulator advancement angle, tan v = sinv = sina ÷ sin ψ; wherein a is the installation inclination angle of the granulator, the unit is DEG, and the design parameter of the granulator is shown; psi is the blend repose angle, in degrees;
n is the rotating speed of the granulator, and the unit is r/min;
step 5, according to a functional relation of the filling rate phi, the production capacity Q and the granulation time t,
φ＝［Qt÷（60πRe2le. rho) ] × 100% to obtain the relation between the filling rate phi and the production capacity Q and the granulation time t;
in the formula: phi is the fill fraction,%;
q is the production capacity of the granulator, the unit is t/h, and the production data is;
re is the effective radius of the granulator, the unit is m, Re = De/2, and is a design parameter of the granulator;
rho is the bulk density of the mixture and has the unit of t/m3Obtained by measurement;
t is the granulation time in min;
and 6, obtaining a relational expression of the filling rate and the rotating speed of the granulator and the production capacity t/h through the functional relational expression of the step 4 and the step 5, and calculating to obtain the suitable rotating speed range under different production capacities.
2. The method of determining the rotational speed of a sintering granulator according to claim 1, wherein: the filling rate is equal to the percentage of the volume of the mixture in the effective volume of the granulator.
3. The method of determining the rotational speed of a sintering granulator according to claim 1, wherein: in the step 2, the determination method of the mixture repose angle psi comprises the following steps: and naturally dropping the mixture into a shape of a delta isosceles triangle, and measuring an internal included angle between the inclined edge and the bottom edge of the isosceles triangle to obtain the repose angle psi of the mixture.
4. The method of determining the rotational speed of a sintering granulator according to claim 1, wherein: in step 3, the method for measuring the bulk density rho of the mixed material comprises the following steps:
step 3.1, manufacturing the product with the length, width and height of 0.5m and the volume of 0.125m3The weight G of the wooden box is weighed1The unit: t;
step 3.2, filling the mixture into the wood box, leveling the material surface by using a batten along the upper edge of the wood box, and weighing the wood box and the mass G of the mixture2The unit: t;
step 3.3, according to a formula: bulk density of the mixture rho ═ (G)2－G1) And 0.125, and calculating to obtain the bulk density rho of the mixture.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS58189028A (en) * | 1982-04-28 | 1983-11-04 | Nippon Steel Corp | Granulation of sintered stock material |
| JPH06327960A (en) * | 1993-05-24 | 1994-11-29 | Kawasaki Steel Corp | Constant control method for occupying volume pate of mixer for sintering material |
| CN2460793Y (en) * | 2000-12-01 | 2001-11-21 | 江苏正昌集团有限公司 | Adjustable-speed gearing for granular making machine |
| CN101898102A (en) * | 2009-05-31 | 2010-12-01 | 上海亦晨信息科技发展有限公司 | Rotating speed adjustable pelletizing device |
| CN103334004B (en) * | 2013-06-30 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Method for producing sinter from Yuanjia village concentrate powder by using large sintering machine |
| CN103344116B (en) * | 2013-07-05 | 2015-03-25 | 山西太钢不锈钢股份有限公司 | Method of regulating and controlling air volume of sintering machine by using main ventilation valve and rotating speed in combined mode |
| JP2015096651A (en) * | 2013-10-22 | 2015-05-21 | ヴァーレ、ソシエダージ、アノニマＶａｌｅ Ｓ．Ａ． | Apparatus for improving crude pellet and pelletization method |
| CN103757202B (en) * | 2014-01-30 | 2016-06-29 | 首钢总公司 | Sintering method for sintering part of return ores without granulation |
| CN104933227B (en) * | 2015-05-26 | 2019-06-25 | 武汉钢铁有限公司 | A kind of sintering mixer based on numerical simulation is suitable for the determination method of grain made parameter |
| CN108396136B (en) * | 2017-02-05 | 2019-06-25 | 鞍钢股份有限公司 | Preparation method of sintering mixture and material distribution method and device thereof |
| CN109200933A (en) * | 2018-11-15 | 2019-01-15 | 燕山大学 | Intelligent trommel mixer mixing is granulated production equipment and its production method |
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