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CN-121135062-B - Steel rotary hearth furnace waste water mixes pond and waste water purification device soon

CN121135062BCN 121135062 BCN121135062 BCN 121135062BCN-121135062-B

Abstract

The invention relates to the technical field of wastewater treatment equipment, in particular to a steel rotary hearth furnace wastewater rapid mixing tank and a wastewater purifying device. The steel rotary hearth furnace waste water quick mixing pool comprises a pool body, a quick mixing device and a blade assembly, wherein the top of the pool body is provided with a cover body, a pool cavity is formed by enclosing the cover body and the pool body, a magnetic powder filling port for filling magnetic powder is formed in the cover body, the quick mixing device is arranged on the cover body and comprises a power mechanism, a rotating shaft and a blade assembly, the power mechanism is driven by the power mechanism and penetrates through the cover body in a sealing mode to vertically extend into the pool cavity, the blade assembly is fixed on the rotating shaft, the outer side of a flow facing surface of the blade is covered with a wear-resistant floating piece, the wear-resistant floating piece is detachably connected with a corresponding blade through an elastic piece, a coupling relation with elastic compliance is formed between the wear-resistant floating piece and the blade, and a main body bearing wear is transferred onto the replaceable wear-resistant floating piece from the blade on the premise that the turbulence mixing intensity required by the quick mixing pool is not sacrificed, so that the service life problem of equipment caused by magnetic powder erosion is essentially solved.

Inventors

  • CHEN LEI

Assignees

  • 北京东雷恒业环保科技有限公司

Dates

Publication Date
20260512
Application Date
20251114

Claims (9)

  1. 1. A steel rotary hearth furnace wastewater rapid mixing tank, comprising: the top of the tank body is provided with a cover body, the cover body and the tank body enclose a tank cavity, and the tank cavity is provided with a liquid inlet and a liquid outlet; the coagulant aid filling device comprises a magnetic powder filling port which is communicated with the tank cavity and used for filling magnetic powder; the quick mixing device is arranged on the cover body and comprises a power mechanism, a rotating shaft and a blade assembly, wherein the power mechanism is fixed on the outer side of the cover body, the rotating shaft is driven by the power mechanism and penetrates through the cover body in a sealing way to vertically extend into the pool cavity, and the blade assembly is fixed on the rotating shaft; The blade assembly comprises at least two blades, wherein the outer side of the flow facing surface of each blade is covered with a wear-resistant floating piece, the wear-resistant floating piece is in a shell shape and covers the flow facing surface and the outer side end surface of each blade, the wear-resistant floating piece is detachably connected with the corresponding blade through an elastic piece and forms a coupling relation with the blade with elastic compliance, a blade root area of the corresponding blade is provided with a hinge shaft, the elastic piece comprises a pre-tightening torsion spring sleeved on the hinge shaft and providing restoring torque, so that the wear-resistant floating piece can rotate relative to the blade, and under the action of liquid flow and/or particle impact load, the elastic piece deforms, and the wear-resistant floating piece generates relative displacement relative to the blade along the flow facing surface normal direction and is close to the flow facing surface, and the wear-resistant floating piece is restored by the elastic piece after the load is relieved; The blade has preset thickness in the area covered by the wear-resistant floating piece, an accommodating cavity is formed in the blade, and a magnetic piece with preset magnetic force is arranged in the accommodating cavity; The preset thickness and the magnetic force parameter of the magnetic piece are configured such that when the wear-resistant floating piece is close to the blade and the minimum distance between the magnetic piece and the outer surface of the wear-resistant floating piece is reduced to a preset distance, the magnetic piece provides a magnetic field for adsorbing magnetic powder and forming a magnetic powder coating on the outer side of the wear-resistant floating piece.
  2. 2. The steel rotary hearth furnace wastewater rapid mixing tank according to claim 1, wherein, The blade has a convergent profile on a section parallel to the flow-facing surface, and the thickness of the blade gradually decreases from the blade root to the blade tip side.
  3. 3. The steel rotary hearth furnace wastewater rapid mixing tank according to claim 2, wherein, The accommodating cavity comprises a sliding cavity channel extending from the blade end side of the blade to the blade root along the radial direction of the blade; The magnetic piece comprises a magnetic sliding block which is in sliding connection with the inner wall of the sliding cavity, and the inner end of the magnetic sliding block is connected with the inner end of the sliding cavity through a return component; When the rotating shaft drives the blade assembly to rotate, the magnetic sliding block slides between the inner end and the outer end of the sliding cavity under the combined action of centrifugal force and return force of the return member, when the rotating speed is higher than a preset rotating speed threshold value, the magnetic sliding block slides to the outer end of the sliding cavity, and when the rotating speed is not higher than the preset rotating speed threshold value, the magnetic sliding block is positioned at the inner end of the sliding cavity.
  4. 4. The steel rotary hearth furnace wastewater fast mixing tank according to claim 3, wherein the magnetic sliding block is made of a permanent magnet.
  5. 5. A steel rotary hearth furnace wastewater fast mixing tank according to any of claims 1 to 3, characterized in that said wear resistant float member is made of alumina-based composite ceramic.
  6. 6. The steel rotary hearth furnace wastewater fast mixing tank according to claim 1, wherein the blades are arranged obliquely relative to a plane perpendicular to the rotating shaft and form an inclination angle with the rotating shaft, and the flow facing surfaces of the blades are arranged upwards.
  7. 7. The steel rotary hearth furnace wastewater rapid mixing tank according to claim 1, wherein the bottom of the tank body is configured into a reverse pyramid shape, an air inlet hole is arranged on the side wall of the reverse pyramid shape, and the position of the air inlet hole is lower than the lowest position of the blade assembly.
  8. 8. The steel rotary hearth furnace wastewater rapid mixing tank according to claim 1, wherein, Under the action of the pre-tightening torsion spring, a wedge-shaped gap which gradually increases from a blade root to a blade end side is formed between the inner surface of the wear-resistant floating piece and the flow facing surface of the blade; A seal is provided at the engagement edge of the wear float member and the blade for sealing the wedge gap while permitting relative rotation of the wear float member.
  9. 9. A steel rotary hearth furnace wastewater purification device, comprising: The flash pool of any one of claims 1 to 8; A flocculation tank in fluid communication with a liquid outlet of the rapid mixing tank; a clarifier-settling tank in fluid communication with the water outlet of the flocculation tank, and The mud inlet of the magnetic powder recovery system is communicated with the mud outlet of the clarification sedimentation tank, and the magnetic powder outlet of the magnetic powder recovery system is communicated with the magnetic powder filling port of the rapid mixing tank.

Description

Steel rotary hearth furnace waste water mixes pond and waste water purification device soon Technical Field The invention relates to the technical field of wastewater treatment equipment, in particular to a steel rotary hearth furnace wastewater rapid mixing tank and a wastewater purifying device. Background The iron and steel rotary hearth furnace is a key device for treating metallurgical iron-containing dust, realizing iron-zinc separation and iron resource recovery, and can generate a large amount of wastewater with complex components in the operation and subsequent flue gas washing processes. The wastewater generally contains high-concentration suspended matters, heavy metal ions, ferric salts and zinc salts which are not fully reacted and fine mineralized particles, and the efficient pretreatment is a precondition for guaranteeing the stable operation of a subsequent advanced treatment system and realizing the recycling and standard-reaching discharge of water resources. In the prior art, the reinforced magnetic precipitation technology has been gradually applied to the pretreatment link of the steel rotary hearth furnace wastewater due to the advantages of high sedimentation speed, small occupied area, high treatment efficiency and the like. The core of the technology is that magnetic powder is added into the wastewater to serve as crystal nucleus and weighting medium, and high-density magnetic floccules taking the magnetic powder as the core are formed through coagulation and flocculation, so that suspended matters and partial soluble pollutants are quickly settled and separated. However, this technology exposes a technical bottleneck to be solved in the industrial application process, especially in the fast mixing tank, which is a key unit. The rapid mixing tank plays a core role of uniformly and vigorously mixing magnetic powder, medicament and wastewater in a moment, and the stirring device of the rapid mixing tank is required to maintain high rotation speed and shearing force. However, the main component of the magnetic powder, ferroferric oxide, has high hardness and large specific gravity, and in the turbulence formed by high-speed stirring, the solid particles generate continuous and intense impact and abrasion on the stirring blade. The existing rapid mixing pool commonly adopts a metal or alloy blade with a rigid structure, and even if a wear-resistant coating is applied to the surface of the metal or alloy blade, the coating is extremely easy to peel off, the base material is worn or even deformed under the condition of long-term collision of particles bearing high frequency and high kinetic energy. The method not only obviously shortens the service life of the core stirring component and increases the equipment maintenance cost and production stopping risk, but also directly influences the flow field distribution and the mixing efficiency due to the change of the blade shape, so that the magnetic powder is unevenly dispersed and the flocculation effect is reduced. In addition, to cope with wear and maintain the mixing strength, the system is often forced to use higher-specification materials or increase the stirring power, indirectly increasing the construction and operation costs. Therefore, the field is faced with a remarkable contradiction for a long time that enhanced stirring is required to obtain an excellent magnetic powder mixing effect, and the enhanced stirring working condition inevitably aggravates equipment abrasion and affects the reliability and economy of system operation. The prior art proposal is improved in material upgrading or structural reinforcement, and can not fundamentally solve the problem of long-acting and stable operation of the moving part in a strong abrasive medium. The development of a novel rapid mixing technology capable of effectively reconciling contradiction between mixing efficiency and equipment durability has become an urgent need for promoting further development of steel rotary hearth furnace wastewater strengthening pretreatment technology. Disclosure of Invention The invention aims to solve the technical problems that when the reinforced magnetic precipitation process is carried out in the field of reinforced pretreatment of the waste water of the existing steel rotary hearth furnace, the instant and efficient mixing of magnetic powder and the waste water is realized in a rapid mixing pool, but the added high-hardness and high-specific gravity magnetic powder causes continuous and severe erosion on key parts of a mixing unit under the condition of strong turbulence, so that the reliability of equipment is reduced, the maintenance frequency is increased, the operation cost is increased, and the long-acting stable exertion of the overall efficiency of the high-efficiency water treatment technology is restricted. (II) technical scheme In order to solve the technical problems, the invention provides a steel rotary hearth furnace wastewater rapid m