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CN-122013200-A - Nano-catalysis acid-free rust removal circulating equipment and method for heat treatment of metal parts

CN122013200ACN 122013200 ACN122013200 ACN 122013200ACN-122013200-A

Abstract

The invention provides nano-catalysis acid-free rust removal circulating equipment for heat treatment of metal parts, which comprises a nano-catalysis rust removal reaction unit, a circulating purification and regeneration unit and a regeneration unit, wherein the nano-catalysis rust removal reaction unit comprises a reaction tank for containing neutral nano-catalysis working fluid, the working fluid comprises a nano-catalyst serving as a catalytic active center and an oxidant or complexing agent which is cooperated with the nano-catalyst, a regulating and controlling mechanism for maintaining the reaction temperature and uniformly dispersing the catalyst is arranged in the reaction tank, the circulating purification and regeneration unit is connected with the reaction tank through a pipeline to form a closed loop, and the unit comprises a multi-stage filtering device for removing reaction byproducts on line and a regeneration device for maintaining or recovering the activity of the nano-catalyst on line. The whole process chain is completed under neutral condition, no acid mist or strong acid waste water is generated, and the real green manufacturing is realized.

Inventors

  • DING YAQING

Assignees

  • 春雨(东莞)五金制品有限公司

Dates

Publication Date
20260512
Application Date
20260129

Claims (10)

  1. 1. A nano-catalytic acid-free rust removal circulation device for heat treatment of metal pieces, comprising: A nanocatalytic reaction unit having a reaction tank for containing a neutral nanocatalytic working fluid comprising a nanocatalytic catalyst and an oxidizing or complexing agent; A circulating purifying and regenerating unit connected with the reaction tank to form a working solution circulating loop, wherein the unit comprises a filtering device for separating solid impurities from the used working solution and a regenerating device for separating and regenerating the nano catalyst from the used working solution; The intelligent control unit is used for monitoring the chemical state of the working solution in real time and automatically regulating and controlling the operation parameters of the reaction unit and the regeneration unit so as to maintain the stability and the high efficiency of the rust removal process; Wherein, the nano-catalysis acid-free rust removal circulating equipment is configured to maintain the working solution in a neutral environment with pH value of 6-8 in the whole rust removal and working solution regeneration process.
  2. 2. The nano-catalytic acid-free rust removal circulating equipment for heat treatment of metal pieces according to claim 1, wherein the nano-catalyst is nano-particles with catalytic oxidation or reduction activity.
  3. 3. The nano-catalysis acid-free rust removal circulating equipment for heat treatment of metal pieces, which is disclosed in claim 1, is characterized in that the nano-catalyst is a magnetic nano-catalyst, and the regenerating device is a high-gradient magnetic separator.
  4. 4. The nano-catalysis acid-free rust removal circulating equipment for heat treatment of metal parts according to claim 1, wherein the circulating purification and regeneration unit further comprises an on-line monitoring and automatic dosing system.
  5. 5. The nano-catalytic acid-free rust removal recycling apparatus for heat treated metal articles as set forth in claim 1, further comprising a heat recovery module disposed on the feed path.
  6. 6. The nano-catalytic acid-free rust removal circulating equipment for heat treatment of metal parts according to claim 1, wherein the nano-catalytic reaction unit further comprises an ultrasonic generator or a weak electrolysis device.
  7. 7. An acid-free rust removal method for heat-treated metal parts using the nano-catalytic acid-free rust removal circulation apparatus according to any one of claims 1 to 6, characterized by comprising the steps of: immersing the metal piece with the oxide skin after heat treatment into the neutral nano catalytic working solution, and carrying out catalytic rust removal reaction at 60-85 ℃; Allowing the reacted working solution to flow through the circulating purification and regeneration unit to remove solid reaction products and regenerate the nano catalyst, and simultaneously maintaining the pH value of the working solution to be 6-8; And returning the regenerated working solution to the reaction tank for recycling.
  8. 8. The method for acid-free rust removal of heat treated metal parts according to claim 7, wherein the nanocatalyst is a magnetic nanocatalyst, and the regenerating step in the regenerating unit comprises separating the magnetic nanocatalyst from the working fluid using a high gradient magnetic separator and performing a surface regeneration treatment.
  9. 9. The acid-free rust removing method for heat treated metal parts as set forth in claim 7, further comprising the step of preheating the working fluid by utilizing waste heat from the heat treatment process of the metal parts before the rust removing reaction.
  10. 10. The nano catalytic rust removing working fluid is characterized in that the working fluid is used for the acid-free rust removing method of the heat treatment metal piece according to any one of claims 7-9, and consists of deionized water or neutral salt solution, 0.5-2.0 g/L of nano catalyst and 1-3% of hydrogen peroxide or equivalent complexing agent.

Description

Nano-catalysis acid-free rust removal circulating equipment and method for heat treatment of metal parts Technical Field The invention relates to the technical field of metal surface treatment, in particular to an environment-friendly, efficient and resource circulation type rust removing device and method for oxide skin on the surface of a metal workpiece (such as a screw, a spring and other standard components) after heat treatment. Background After annealing heat treatment, a compact oxide scale (mainly Fe 3O4 and Fe 2O3) is formed on the surface of the metal standard parts such as screws. The traditional mainstream technology adopts strong acid such as hydrochloric acid, sulfuric acid and the like for pickling. The method has heavy environmental pollution, generates acid mist and heavy metal-containing wastewater, has excessive corrosion risk on a workpiece matrix, and has a severe working environment. The Chinese application publication No. CN109940503A discloses a degreasing and rust removing method for a steel structural member, wherein the degreasing and rust removing method for the steel structural member comprises the steps of firstly placing the steel structural member into a degreasing tank with a turbulence device for soaking, degreasing and rust removing, leading the degreasing slurry in the degreasing tank into a rust removing tank, adding an acid solution into the tank to keep the PH value in the rust removing tank to be 9-11, stirring and soaking for 10-30 min, dissolving iron rust contained in the slurry, finally carrying out solid-liquid separation on the slurry dissolved with the iron rust through centrifugal separation equipment, and putting the separated solid abrasive into the degreasing tank again for continuous use. By the method, most of grease and rust on the steel structural member can be removed by using physical action, the acid and alkali consumption in the pretreatment procedure of the hot galvanizing process is reduced, the pollution to water resources is reduced, and the pressure of subsequent wastewater treatment is reduced. This prior art has the following inherent drawbacks: 1. The rust removing mechanism is limited in that the core is physical and mechanical scraping, and the removal efficiency is low for compact and firm oxide skin layers formed after annealing, so that uneven treatment or damage to edges and corners of a workpiece are easy to occur. 2. The acid-free process is not really realized, that is, an acid solution is still required to be introduced to dissolve rust in the abrasive regeneration stage, the acid chemistry is still basically relied on, and the use of deacidification and the subsequent treatment of acid-containing waste liquid cannot be achieved. 3. The medium has single function, the nano material is only used as a mechanical abrasive, and can be 'invalid' due to the adhesion of rust after use, and an additional and complex off-line pickling regeneration step is needed, so that the circulation flow is long, and the system is complex. 4. The energy consumption is high mainly by means of turbulent kinetic energy, and the energy source cooperation with the heat treatment process is not considered. Therefore, a truly green and intelligent rust removal technology and equipment capable of thoroughly discarding acidic substances in principle, achieving zero damage to a workpiece and realizing online efficient regeneration of a working medium is needed. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides intelligent rust removal circulating equipment and method based on nano catalytic chemical action, which are free of acid in the whole process and can realize in-situ regeneration of catalytic media. A nano-catalytic acid-free rust removal circulation device for heat treatment of metal pieces, comprising: The nano catalytic rust removal reaction unit comprises a reaction tank for containing neutral nano catalytic working fluid, wherein the working fluid comprises a nano catalyst serving as a catalytic active center and an oxidant or complexing agent which is cooperated with the nano catalyst, and a regulating and controlling mechanism for maintaining the reaction temperature and uniformly dispersing the catalyst is arranged in the reaction tank; The circulating purification and regeneration unit is connected with the reaction tank through a pipeline to form a closed loop, and comprises a multi-stage filtering device for removing reaction byproducts on line and a regeneration device for maintaining or recovering the activity of the nano catalyst on line; and the intelligent control unit is used for monitoring the chemical state of the working solution in real time and automatically regulating and controlling the operation parameters of the reaction unit and the regeneration unit so as to maintain the stability and the high efficiency of the rust removal process. Further, the nano catalyst is nano particles with