Welding method for cathode netted bag of electrolyzer

A welding method and electrolytic cell technology, which are applied to electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of leaving pits, unevenness not greater than 1/1000, and difficulty in adsorption of diaphragms, achieving good adsorption and good flatness. Effect

Inactive Publication Date: 2003-09-10
徐文新
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the cathode mesh bag used as a metal anode electrolyzer in the chlor-alkali chemical industry is composed of a wire mesh and a conductive grid. Specifically, a hexahedral mesh bag is made of a wire mesh, and a conductive grid is placed in the wire mesh bag. The wire mesh and the conductive grid are connected. Fixing is by direct resistance welding on the membrane adsorption surface of the wire mesh; thus leaving pits on the membrane adsorption surface of the wire mesh, if the diameter of the resistance welding head is greater than 8mm, it is easy to cause the wire mesh around the welding point to block the holes ;Now the production requirements for mesh bags are: the surface unevenness is not greater than 1mm, the unevenness is not greater than 1 / 1000, and the solder joints shall not be greater than 4 meshes, otherwise it is necessary to drill holes at the larger solder joints
Because the current welding method inevitably causes unevenness and hole blocking on the membrane adsorption surface of the wire mesh, when the membrane is adsorbed by the mesh bag, it will cause uneven adsorption of the membrane on the surface of the wire mesh, and pits will be formed on the surface after the membrane is adsorbed and formed. There will also be difficulties in the adsorption of the diaphragm at the welded part of the barbed wire mesh with plugged holes.
Due to the above defects, during the production and use of chlor-alkali, the permeability of the cathode will be uneven, so that the hydrogen content of chlorine in the electrolytic cell is greater than or equal to 2% and the concentration of NaOH is low.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Further understanding of the present invention and its advantages can be obtained from the following examples.

[0015] 1. Put the conductive grid in the wire mesh bag, position and press them tightly, use a special welding rod to extend into the mesh bag through the gap between the wire mesh and the conductive grid, and weld between the wire mesh and the conductive grid. The plate is welded and fixed to make A cathode mesh bag. The special welding rod is made by welding a welding rod with a diameter of 4mm and a welding rod with a diameter of 3.2mm together by gas welding, and the welding rod with a diameter of 4mm is in the special The welding rod is used for conducting electricity, and the welding rod with a diameter of 3.2mm is used for welding when the special welding rod is used. The diameter of the welding point of the prepared cathode mesh bag is less than one mesh hole, and there are no pits and hole blocking defects on the outer surface of the wire mesh.

[0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The welding process of netted cathode bag for electrolyzer with metal anode including positioning and pressing the conducting grid plate inside the wire net bag; extending the special welding rod via the wire net bag to weld the conducting grid plate and the wire net bag together. The said special welding rod is one of several welding rods in the diameter not greather than 4 mm and connected together via gas welding. The said welding process forms no notch to the surface of and no blocking in the wire net bag, and this is favorable to adsorption of the diaphragm.

Description

1. Technical field: [0001] The invention relates to a welding method for a cathode mesh bag of an electrolytic cell, in particular to a welding method for a cathode mesh bag of a metal anode electrolytic cell used in the chlor-alkali chemical industry. 2. Technical background: [0002] At present, the cathode mesh bag used as a metal anode electrolyzer in the chlor-alkali chemical industry is composed of a wire mesh and a conductive grid. Specifically, a hexahedral mesh bag is made of a wire mesh, and a conductive grid is placed in the wire mesh bag. The wire mesh and the conductive grid are connected. Fixing is by direct resistance welding on the membrane adsorption surface of the wire mesh; thus leaving pits on the membrane adsorption surface of the wire mesh, if the diameter of the resistance welding head is greater than 8mm, it is easy to cause the wire mesh around the welding point to block the holes ; Now the production requirements for mesh bags are: the surface uneve...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/46C25B11/00
Inventor 徐文新
Owner 徐文新
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products