Calcination and cleaning method of spinneret

Abstract

The invention relates to a method for calcination and cleaning of a spinneret. The spinneret is calcined in a muffle furnace. A cathode wire and an anode wire are arranged in the furnace of the muffle furnace. The cathode wire and the anode wire are Through the furnace body of the muffle furnace and insulated from heat, the cathode wire is connected to the cathode, the anode wire is connected to the negative pole of the DC power supply, the positive pole of the DC power supply is connected to the anode through a wire, and the cathode and the anode are placed In the electrolytic cell; the two sides of the spinneret are respectively connected to the cathode wire and the anode wire. Under the action of an external power supply, the oxidation or sulfidation corrosion of the spinneret under high temperature calcination is greatly inhibited, so that the material and structure of the spinneret are guaranteed to be complete while the calcination is effective, so as to prolong the use of objects and furnace body Long service life and ensure the stability and high efficiency of spinning work.

Description

technical field [0001] The invention relates to a method for calcination and cleaning of a spinneret, in particular to a method for calcination and cleaning of a spinneret to prevent corrosion. Background technique [0002] At present, during the production and development of chemical fibers, the spinneret needs to be cleaned, and the spinneret needs to be placed in a muffle furnace for high-temperature calcination and cleaning at a temperature of 300-600°C. [0003] Since the spinneret is made of alloy steel, if the polymer raw material contains highly oxidizing elements such as oxygen and sulfur, the metal will lose electrons under high temperature conditions, and the valence will increase, while oxygen or sulfur will gain electrons, maintaining the The electrical neutrality of the system forms a metal oxide or sulfide, which is called metal oxidation or sulfide. If the oxidation or sulfide corrosion of the spinneret material is caused during the calcination and cleaning ...

AI Technical Summary

Problems solved by technology

[0004] 1. The material of the spinneret is corroded, the structure of the material is defective, the material becomes brittle, and the size is deformed, which affects the next production process;

[0005] 2. The accumulation of metal corrosion products covers the chemicals that need to be calcined and cleaned, resulting in unclean cleaning and affecting production;

[0006] 3. Metal corrosion will accumulate in a large amount in the muffle furnace, which will affect the thermal efficiency and lead to a short service life of the equipment

[0008] 1. Control the corrosion environment, that is, vacuum calcination, so that the sulfur oxides produced by the calcination process can be removed from the furnace chamber in time, so as to reduce the contact between the compound and the objects to be cleaned. Although this method can reduce the corrosion degree of the material, it does not prevent it from Basically eliminate the corrosion of materials;

[0009] 2. Choose corrosion-resistant materials, but the selectivity of materials is small, because if the metal undergoes sulfide corrosion, the generated sulfide has special properties, unstable, large volume ratio, easy peeling of the film, many lattice defects, melting point and boiling point Low, easy to generate various sulfides without price. Such sulfides and oxides, sulfates and metals are easy to form low-melting eutectics, so there are not many high-temperature-resistant vulcanized materials;

[0010] 3. Select an effective anti-corrosion layer, that is, carry out anti-corrosion treatment on the surface of the object to be cleaned. Commonly used protection technologies include using NiCr, FeCr and Inconel625 thermal coatings on the material surface for arc spraying, supersonic spraying, etc. It has a certain protective effect, but the thermal coating used contains Cr, which will make the material more brittle, making it difficult to carry out high-pressure spinning for a long time, and the repair and maintenance costs are high

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