CN107519781B - High-corrosion-resistance stirrer and manufacturing method thereof - Google Patents

High-corrosion-resistance stirrer and manufacturing method thereof Download PDF

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CN107519781B
CN107519781B CN201710568760.6A CN201710568760A CN107519781B CN 107519781 B CN107519781 B CN 107519781B CN 201710568760 A CN201710568760 A CN 201710568760A CN 107519781 B CN107519781 B CN 107519781B
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blade
fixing plate
ratio
blades
hub
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CN107519781A (en
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姚长江
王新鹏
罗利阳
梁晓辉
朱晓锋
张娟娟
陈帅超
张春林
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CSSC Shuangrui Luoyang Special Equipment Co Ltd
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Luoyang Sunrui Special Equipment Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/02—Apparatus therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
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Abstract

A high corrosion resistant stirrer comprises a stirring shaft, a hub, a blade fixing plate and blades, wherein one end of the stirring shaft is connected with a power device, the other end of the stirring shaft is welded with the hub, one end of the blade fixing plate is welded with the hub, the other end of the blade fixing plate is connected with the blades through fasteners, the blade fixing plate is a flat plate, the angle between the blade fixing plate and the axis of the stirring shaft is 30 degrees to 50 degrees, the surface hardness of the blades is 20 HRC to 24HRC, the inclination angle and the width of the blades are changed along with the length direction of the blades, the blades are refined through a medium frequency induction furnace and an argon oxygen decarburization furnace in sequence, a super duplex stainless steel ingot is smelted by adopting an electroslag remelting process, the super duplex stainless steel ingot is forged and formed, and the super duplex.

Description

High-corrosion-resistance stirrer and manufacturing method thereof
Technical Field
The invention belongs to the technical field of special liquid stirring, and particularly relates to a high-corrosion-resistance stirrer and a manufacturing method thereof.
Background
The liquid stirring problem is involved in the industries of chemical industry, food, metallurgy, paper making, petroleum, water treatment and the like, namely: different industrial liquids are mixed by a stirrer, so that the components, heat and density of the industrial liquids are uniform, and the requirements of actual production are met.
The stirrer generally comprises a shaft and a blade, wherein the blade is a core part of the stirrer, and a certain flow field is formed by the rotation of the blade, so that the mixing of different liquids is realized.
The hydrometallurgical zinc industry uses liquids for extraction, leaching, pickling and other processes that are highly corrosive and, therefore, the stirrers used for stirring the liquids must have good corrosion resistance. At present, the design method of the stirrer used in the domestic wet-process zinc smelting industry is as follows: the shaft and the blade are made of carbon steel, and then the outer surface of the shaft and the blade is coated with resin, so that the corrosion resistance of the stirrer is improved. The technical advantages of the scheme are as follows: the resin can effectively prevent corrosive liquid from contacting with carbon steel, and has good corrosion resistance. The technical defects of the scheme are as follows: firstly, the coating process of the resin is complex and the manufacturing cost is high; secondly, the wear resistance of the resin is poor, particles in the liquid collide with the resin to rub in the liquid stirring process, so that the resin is damaged, and the corrosive liquid and the carbon steel undergo severe chemical reaction to cause corrosion failure; the stirrer is short in service life and needs to be replaced once a year on average.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-corrosion-resistance stirrer and a manufacturing method thereof through material design, structural design and the like of a stirrer, so that the production cost is reduced, and the service life and the use safety of zinc-making industrial equipment are improved.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a high corrosion resistant stirrer comprises a stirring shaft, a hub, a blade fixing plate and blades, wherein one end of the stirring shaft is connected with a power device, the other end of the stirring shaft is welded with the hub, at least three fixing plate slots are uniformly distributed on the excircle of the hub, one end of the blade fixing plate is matched with the fixing plate slots and welded in the fixing plate slots, the other end of the blade fixing plate is connected with the blades through fasteners, the blade fixing plate is a flat plate, the angle between the blade fixing plate and the axis of the stirring shaft is 30-50 degrees, the surface hardness of the blades is 20-24HRC, the inclination angle and the width of the blades are changed along with the length direction of the blades, and the shape and the size,
b＝(0.2～0.55)L1 (1)
b1＝(0.35～0.7)b (2)
5L<0.8L1 (3)
wherein L1 is the length of the blade; the end part of the blade is divided into five parts I, II, III, IV and V on average, and L is the distance between each part; b is the width of the blade root; b1 is the width of the blade tip; alpha is the angle of the root of the blade, and the range of the alpha is 0-26 degrees; beta is the included angle between the end part and the root part of the blade, and the range of the beta is 16 degrees to 24 degrees.
The stirring shaft, the hub, the blade fixing plate and the blades are all made of super duplex stainless steel.
A preparation method of a high-corrosion-resistance stirrer comprises the following steps:
firstly, smelting a consumable electrode by a primary smelting process of a medium-frequency induction furnace and a refining process of an argon-oxygen decarburization furnace in sequence, and smelting a super duplex stainless steel ingot by an electroslag remelting process;
heating the super duplex stainless steel ingot to 1100-1180 ℃, preserving heat for 4-5 hours, and then quickly discharging the steel ingot out of the furnace, forging the steel ingot into each component by adopting forging equipment, wherein the upsetting ratio R1 is more than or equal to 1.8, the drawing ratio R2 is more than or equal to 3, and the total forging ratio R is more than or equal to 5; the upsetting ratio R1 is the ratio of the height of the blank before upsetting to the height of the blank after upsetting, the drawing ratio R2 is the ratio of the sectional area of the blank before drawing to the sectional area of the blank after drawing, and the total forging R is R1+ R2-1;
and step three, heating the forged and formed assembly to 1050-.
The contents of Cr, Mo, W and N elements in the super duplex stainless steel meet the condition that Cr +3.3 x (Mo +0.5W) +16N is more than or equal to 42.
The electroslag remelting process specifically comprises the following steps
a) The selected slag components and the weight percentage are as follows: CaF2:Al2O3:CaO:SiO250 percent, 25 percent, 20 percent, 5 percent or CaF2:Al2O3:CaO:SiO255 percent, 20 percent, 5 percent and 80kg of slag charge, wherein the baking temperature of the slag charge is 800 ℃, and the baking time is 8-10 hours;
b) the baked slag system is according to CaF2、SiO2、CaO、Al2O3The raw materials are sequentially added into a crystallizer, arc striking and slagging are carried out, and the slagging time is 50 minutes;
c) moving the consumable electrode into a liquid slag bath, and starting electroslag remelting, wherein the melting speed of the electrode is 390 kg/h;
d) after the consumable electrode is melted, preserving the heat in the crystallizer for 60 minutes;
e) after demolding, the material is slowly cooled in a slow cooling pit for 36 hours.
Compared with the prior art, the invention has the beneficial effects that: through the design of the blades of the stirrer, the actual shaft power is reduced by 20-30% compared with that of the traditional inclined blade paddle stirrer under the same stirring effect, and the energy consumption can be effectively reduced. The stirrer has high strength, high hardness and high corrosion resistance, can be completely adapted to the abrasive fluid liquid environment containing corrosive media and solid particles, has the service life prolonged to 8-10 years and far exceeds that of the existing stirrer, ensures the safety and reliability of stirring equipment, greatly reduces the maintenance frequency and cost of the equipment, and has obvious economic benefit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a stirrer shaft of the present invention;
FIG. 3 is a schematic view of the hub of the present invention;
FIG. 4 is a schematic view of a blade of the present invention;
in the figure: 1. the device comprises a connecting flange, 2, reinforcing ribs, 3, a stirring shaft, 4, a hub, 5, a blade fixing plate, 6 and a fastener; 7. blade, 8, axle, 9, location axle, 10, locating hole, 11, fixed plate slot, 12, blade tip, 13, blade root, 14, bolt hole.
Detailed Description
Structural design of stirrer
The structure of the novel stirrer comprises a stirring shaft 3, a hub 4, blades 7 and a blade fixing plate 5, and can also be provided with a connecting flange 1 and a reinforcing rib 8, wherein one end of the stirring shaft 3 is connected with a power device, and the other end of the stirring shaft is connected with the hub 4, as shown in figure 1.
One end of the connecting flange 1 is connected with the stirring shaft 3 in a welding mode, and the other end of the connecting flange is connected with the power device.
The reinforcing ribs 2 are triangular, are distributed along the circumferential direction of the shaft, are welded on the stirring shaft and the flange, and strengthen the strength between the connecting flange and the shaft.
The stirring shaft 3 is characterized in that: the step shaft structure is integrally forged and machined by corrosion-resistant materials, the diameter of the outer circle of the positioning shaft 9 at one end is as large as that of a positioning hole 10 in the end face of the hub, and the positioning shaft 9 is welded and connected after being inserted into the positioning hole 10.
The hub 4 is characterized in that: adopt corrosion resistant material integral forging, machine-shaping, there is a locating hole 10 on the wheel hub, and the diameter of downthehole circle is big as the excircle diameter of location axle 9, guarantees the coaxial design of wheel hub and axle, and the excircle of wheel hub has three evenly distributed's fixed plate slot 11. As shown in fig. 3.
The blade fixing plate 5 is characterized in that: the anti-corrosion material is adopted for integral forging and machining forming, the shape of the blade fixing plate 5 is matched with the fixing plate slot 11 on the hub, the blade fixing plate 5 is inserted into the fixing plate slot 11, and then welding is firm. Three bolt holes are uniformly distributed in the blade fixing plate 5, the three bolt holes are completely coincided with the bolt holes in the blades, the fixing plate and the blades are connected through the fastener 6 through the bolt holes, and the blades are easily detached and replaced. The blade fixing plate and the axial line of the stirring shaft form an included angle of 30-50 degrees.
The blade 7 is shown in fig. 4, and the blade is characterized in that: firstly, adopting corrosion-resistant materials to integrally forge and machine and form; secondly, the surface hardness of the blade is 20-24HRC, and the blade has good wear resistance; and the inclination angle and the width of the blade are changed along with the length direction of the blade. The shape and size of the blade satisfy the formulas (1), (2) and (3),
b＝(0.2～0.55)L1 (1)
b1＝(0.35～0.7)b (2)
5L<0.8L1 (3)
wherein L1 is the length of the blade; the end part of the blade is divided into five parts I, II, III, IV and V on average, and L is the distance between each part; b is the width of the blade root; b1 is the width of the blade tip; alpha is the angle of the root of the blade, and the range of the alpha is 0-26 degrees; beta is the included angle between the end part and the root part of the blade, and the range of the beta is 16 degrees to 24 degrees.
The corrosion-resistant material is super duplex stainless steel.
And (II) smelting the consumable electrode by an intermediate frequency induction furnace primary smelting and Argon Oxygen Decarburization (AOD) furnace refining process, and smelting a super duplex stainless steel ingot by an electroslag remelting (ESR) process, wherein the weight percentage of the element content of the steel ingot is shown in Table 1. Wherein, the content of Cr, Mo, W and N elements satisfies the formula (4):
Cr+3.3×(Mo+0.5W)+16N≥42 (4)
TABLE 1 chemical composition (wt%) of super duplex stainless steel
Figure GDA0002889655910000041
And thirdly, heating the steel ingot to 1100-1180 ℃, preserving heat for 4-5 hours, then quickly discharging, and forging the steel ingot into shapes of a stirring shaft, a hub, blades and the like by adopting forging equipment. In order to ensure the performance uniformity of products and improve the service performance, hot working forming is carried out through upsetting and drawing, wherein the upsetting ratio R1 is more than or equal to 1.8, the drawing ratio R2 is more than or equal to 3, and the total forging ratio R is more than or equal to 5.
The upsetting ratio R1 is the ratio of the height of the blank before upsetting to the height of the blank after upsetting, the drawing ratio R2 is the ratio of the sectional area of the blank before drawing to the sectional area of the blank after drawing, and the total forging R is R1+ R2-1.
And fourthly, heating the forged and formed workpiece to 1050-.
And (V) processing the workpiece subjected to the solution treatment to the designed shape.
And (VI) assembling the components into a stirrer according to the figure 1.
The present invention will be further described with reference to the following examples.
Example 1: 00Cr25Ni7Mo3.5WCuN super duplex stainless steel stirrer
Structural design of stirrer
a) According to the fluid mechanics principle, calculating the critical rotating speed N of the stirrer according to the formula (5)cAnd 74.8r/min, wherein the rotating speed meets the requirement of the output rotating speed of the speed reducer.
Figure GDA0002889655910000051
Wherein K is a constant, d is the diameter of the blade, dpIs the diameter of solution particles, C is the solid-liquid mass ratio, v is the kinematic viscosity of the liquid, rho is the density of the liquid phase, and rho issAs solid phase density, g is the acceleration of weight.
b) According to the principle of fluid mechanics, the power P of the stirrer is calculated to be 6.2KW according to the formulas (6) to (11), and is smaller than the power of the motor. Therefore, the diameter and the width of the paddle are reasonably selected, and the design requirement is met.
P＝NpρMediumN3d5 (6)
Figure GDA0002889655910000052
Figure GDA0002889655910000053
Figure GDA0002889655910000054
Figure GDA0002889655910000055
Figure GDA0002889655910000056
Wherein N isPThe method is characterized in that the method is a power standard number, N is the rotating speed of a blade, rho medium is the equivalent density of liquid and solid, D is the diameter of the blade, eta is the viscosity of liquid, D is the diameter of a groove body, theta is the included angle between the installation angle of the blade and a rotating plane, and H is the height of the liquid.
c) According to the strength checking principle and considering that the corrosion allowance of the material is 4mm, the shaft diameter d shaft of the stirrer is calculated to be 80mm according to the formulas (12) to (19), and the design requirement is met.
Figure GDA0002889655910000057
M＝Mr+Mx (13)
Figure GDA0002889655910000061
F0＝0.05Fp (15)
Mr＝(Fp+F0)*ι (16)
Figure GDA0002889655910000062
Figure GDA0002889655910000063
Figure GDA0002889655910000064
Wherein T is the torque of the stirrer, M is the bending moment, P is the power of the motor, N is the rotating speed of the stirrer, FpFor unsteady forces, F0For eccentric forces, MrIs the bending moment of the shaft, iota is the distance of the impeller from the upper flange, TeIs equivalent moment, σbIs the tensile strength, [ lambda ] of the material]For allowable twist angle, G is the material shear modulus of elasticity.
d) The width of a blade fixing plate is designed to be 100mm and the length of the blade fixing plate is designed to be 80mm according to the size of the shaft diameter, the diameter of a hub is phi 200mm, three fixing plate slots are uniformly distributed on the outer circle of the hub, and the three fixing plate slots and the axis of the hub form an angle of 45 degrees, so that the uniform distribution of blades is guaranteed.
e) According to the blade diameter and the hub diameter, the size of the blade is determined: l is1＝530mm，b＝0.47L1＝250mm,b1＝0.6b＝150mm,L＝80mm。
f) Performing numerical modeling according to the data, and determining through three simulation calculations: the angle alpha of the root part of the blade is 18 degrees, when the included angle beta between the end part of the blade and the root part is 22 degrees, the power of the stirring shaft is minimum, the bottom surface has no deep product phenomenon, and the structure is the optimal result.
And (II) smelting the consumable electrode by an intermediate frequency induction furnace primary smelting and Argon Oxygen Decarburization (AOD) furnace refining process, and smelting a 00Cr25Ni7Mo3.5WCuN super duplex stainless steel ingot by an electroslag remelting (ESR) process, wherein the diameter of the steel ingot is 440mm, and the weight percentage of the element content of the steel ingot is shown in Table 2.
TABLE 200 chemical composition (wt%) of Cr25Ni7Mo3.5WCuN super duplex stainless steel
Figure GDA0002889655910000065
Figure GDA0002889655910000071
The electroslag remelting process comprises the following steps:
a) the selected slag components and the weight percentage are as follows: CaF2:Al2O3:CaO:SiO250 percent of 25 percent of 20 percent of 5 percent of slag charge is 80kg of slag charge, the baking temperature of the slag charge is 800 ℃, and the baking time is 8-10 hours;
b) the baked slag system is according to CaF2、SiO2、CaO、Al2O3The raw materials are sequentially added into a crystallizer, arc striking and slagging are carried out, and the slagging time is 50 minutes;
c) moving the consumable electrode into a liquid slag bath, and starting electroslag remelting, wherein the melting speed of the electrode is 390 kg/h;
d) after the consumable electrode is melted, preserving the heat in the crystallizer for 60 minutes;
e) and after demolding, slowly cooling the steel ingot in the slow cooling pit for 36 hours to remove macroscopic cracks, slag inclusion and other defects on the surface of the steel ingot.
(III) putting the steel ingot into a natural gas heating furnace, heating to 1180 +/-10 ℃, keeping the temperature for 5 hours, then quickly discharging, forging the steel ingot into shapes of a stirring shaft, a hub, blades and the like by adopting a 5-ton forging hammer, wherein the upsetting ratio R is12, elongation ratio R2The total forging ratio R is 9 as 8.
And (IV) putting the forged and formed workpiece into a box-type resistance furnace, heating to 1130 +/-10 ℃, preserving the temperature for 1.5 hours, dissolving a precipitated phase in the microstructure, quickly discharging from the furnace, cooling to room temperature by water, and carrying out solid solution treatment. The yield strength Rp0.2 of the material is 590MPa, and the tensile strength RmIs 800 MPa.
And (V) processing the workpiece subjected to the solution treatment to the designed shape.
And (VI) assembling the components into a stirrer according to the figure 1.
The 00Cr25Ni7Mo3.5WCuN super duplex stainless steel stirrer has good abrasion resistance in an acid medium in the zinc hydrometallurgy industry, does not change along with the change of the PH value of the medium, has the abrasion loss of the material less than 15 mg/month, has the service life longer than 8 years, effectively ensures the safety and the reliability of stirring equipment, greatly reduces the maintenance frequency and the cost of the equipment, and has obvious economic benefit.
Example 2: 00Cr25Ni7Mo4N super duplex stainless steel stirrer
Structural design of stirrer
a) According to the fluid mechanics principle, calculating the critical rotating speed N of the stirrer according to the formula (5)cAnd when the rotating speed is 66r/min, the rotating speed meets the requirement of the output rotating speed of the speed reducer.
b) According to the principle of fluid mechanics, the power P of the stirrer is calculated according to the formulas (6) to (11) to be 19.4KW which is smaller than the power of the motor. Therefore, the diameter and the width of the paddle are reasonably selected, and the design requirement is met.
c) According to the principle of intensity checking and considering the corrosion of the materialThe amount of erosion is 6mm, and the shaft diameter d of the stirrer is calculated according to the formulas (12) to (19)ShaftIs 110mm and meets the design requirement.
d) The width of a blade fixing plate is 100mm and the length of the blade fixing plate is 80mm according to the size of the shaft diameter, the diameter of a hub is phi 240mm, three fixing plate slots are uniformly distributed on the outer circle of the hub, and the three fixing plate slots and the axis of the hub form an angle of 45 degrees, so that the uniform distribution of blades is guaranteed.
e) According to the blade diameter and the hub diameter, the size of the blade is determined: l is1＝720mm，b＝0.39L1＝280mm,b1＝0.5b＝140mm,L＝100mm。
f) Performing numerical modeling according to the data, and determining through three simulation calculations: the value of the angle alpha of the root part of the blade is 16 degrees, when the included angle beta between the end part of the blade and the root part is 24 degrees, the power of the stirring shaft is minimum, the bottom surface has no deep product phenomenon, and the structure is the optimal result.
And (II) smelting a consumable electrode by an intermediate frequency induction furnace primary smelting and Argon Oxygen Decarburization (AOD) furnace refining process, and smelting a 00Cr25Ni7Mo4N super duplex stainless steel ingot by an electroslag remelting (ESR) process, wherein the diameter of the steel ingot is 440mm, and the weight percentage of the elements in the steel ingot is shown in Table 3.
TABLE 300 chemical composition (wt%) of Cr25Ni7Mo4N super duplex stainless steel
Figure GDA0002889655910000081
The electroslag remelting process comprises the following steps:
a) the selected slag components and the weight percentage are as follows: CaF2:Al2O3:CaO:SiO255 percent, 20 percent, 5 percent and 80kg of slag charge, wherein the baking temperature of the slag charge is 800 ℃, and the baking time is 8-10 hours;
b) the baked slag system is according to CaF2、SiO2、CaO、Al2O3The raw materials are sequentially added into a crystallizer, arc striking and slagging are carried out, and the slagging time is 50 minutes;
c) moving the consumable electrode into a liquid slag bath, and starting electroslag remelting, wherein the melting speed of the electrode is 400 kg/h;
d) after the consumable electrode is melted, preserving the heat in the crystallizer for 60 minutes;
e) and after demolding, slowly cooling the steel ingot in the slow cooling pit for 36 hours to remove macroscopic cracks, slag inclusion and other defects on the surface of the steel ingot.
Thirdly, the steel ingot is put into a natural gas heating furnace, the temperature is raised to 1150 +/-10 ℃, the steel ingot is rapidly discharged after being kept for 5 hours, and the steel ingot is forged into the shapes of a shaft, a hub, a blade and the like by adopting a 5-ton forging hammer, wherein the upsetting ratio R is12.5, elongation ratio R2The total forging ratio R was 7.5, 6.
And (IV) putting the forged and formed workpiece into a box-type resistance furnace, heating to 1080 +/-10 ℃, preserving the temperature for 1.5 hours, dissolving a precipitated phase in the microstructure, quickly discharging from the furnace, cooling to room temperature by water, and carrying out solid solution treatment. The yield strength Rp0.2 of the material is 570MPa, and the tensile strength R ismIs 816 MPa.
And (V) processing the workpiece subjected to the solution treatment to the designed shape.
And (VI) assembling the components into a stirrer according to the figure 1.
The 00Cr25Ni7Mo4N super duplex stainless steel stirrer has good abrasion resistance in an acid medium in the zinc hydrometallurgy industry, does not change along with the change of a PH value of the medium, has the abrasion loss of the material less than 18 mg/month, has the service life longer than 8 years, effectively ensures the safety and reliability of stirring equipment, greatly reduces the maintenance frequency and cost of the equipment, and has obvious economic benefit.

Claims (5)

1. The utility model provides a high anti-corrosion stirrer, including (mixing) shaft (3), wheel hub (4), blade fixed plate (5) and blade (7), power device is connected to the one end of (mixing) shaft (3), the other end welding wheel hub (4) of (mixing) shaft (3), three at least fixed plate slot (11) of evenly distributed on the excircle of wheel hub (4), the one end and fixed plate slot (11) phase-match of blade fixed plate (5), and the welding is in fixed plate slot (11), the other end of blade fixed plate (5) is connected with blade (7) through the fastener, its characterized in that: the blade fixing plate (5) is a flat plate, the angle between the blade fixing plate and the axis of the stirring shaft (3) is 30-50 degrees, the surface hardness of the blade is 20-24HRC, the inclination angle and the width of the blade are changed along with the length direction of the blade, the shape and the size of the blade meet the formulas (1), (2) and (3),
b=(0.2~0.55)L1 （1）
b1=(0.35~0.7)b （2）
5L<0.8L1 （3）
in the formula, L1Is the length of the blade; the end part of the blade is divided into five parts I, II, III, IV and V on average, and L is the distance between each part; b is the width of the blade root; b1The width of the blade tip; alpha is the angle of the root of the blade, and the range of alpha is 16-26 degrees; beta is an included angle between the end part of the blade and the root part, the range of beta is 16-24 degrees, the included angle between the end part of the part II and the part I is 0.2 beta, the included angle between the end part of the part III and the part I is 0.4 beta, the included angle between the end part of the part IV and the part III is 0.6 beta, and the included angle between the end part of the part V and the part I is 0.8 beta.
2. A highly corrosion-resistant agitator as claimed in claim 1, wherein: the stirring shaft (3), the hub (4), the blade fixing plate (5) and the blades (7) are all made of super duplex stainless steel.
3. The method for manufacturing a highly corrosion-resistant agitator as claimed in claim 1, wherein: comprises the following steps of (a) carrying out,
firstly, smelting a consumable electrode by a primary smelting process of a medium-frequency induction furnace and a refining process of an argon-oxygen decarburization furnace in sequence, and smelting a super duplex stainless steel ingot by an electroslag remelting process;
step two, heating the super duplex stainless steel ingot to 1100-1180 ℃, preserving heat for 4-5 hours, then quickly discharging, forging the ingot into each component by adopting forging equipment, wherein the upsetting ratio R is1Not less than 1.8, and the draw ratio R2The total forging ratio R is more than or equal to 3 and more than or equal to 5; upsetting ratio R1The ratio of the height of the blank before upsetting to the height of the blank after upsetting, the drawing ratio R2The sectional area of the blank before drawing and the section of the blank after drawingArea ratio, total forging R = R1+ R2-1；
And step three, heating the forged and formed assembly to 1050-.
4. A method for manufacturing a highly corrosion-resistant agitator as claimed in claim 3, wherein: the contents of Cr, Mo, W and N in said super duplex stainless steel meet Cr +3.3 x (Mo +0.5W) +16N not less than 42.
5. A method for manufacturing a highly corrosion-resistant agitator as claimed in claim 3, wherein: the electroslag remelting process comprises the specific steps of
a) The selected slag components and the weight percentage are as follows: CaF2:Al2O3:CaO: SiO225%:20%:5% or CaF =50%: 5%: or2:Al2O3:CaO: SiO220 percent to 5 percent, 80kg of slag charge, 800 ℃ of baking temperature of the slag charge and 8 to 10 hours of baking time;
b) the baked slag system is according to CaF2、SiO2、CaO、Al2O3The raw materials are sequentially added into a crystallizer, arc striking and slagging are carried out, and the slagging time is 50 minutes;
c) moving the consumable electrode into a liquid slag bath, and starting electroslag remelting, wherein the melting speed of the electrode is 390-;
d) after the consumable electrode is melted, preserving the heat in the crystallizer for 60 minutes;
e) after demolding, the material is slowly cooled in a slow cooling pit for 36 hours.
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