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The Difference Between Three Processes Of Stainless Steel Permanent Cathode Electrolysis

- Nov 08, 2018 -

The permanent cathode electrolytic copper technology was first developed and produced in 1978 by the Townsville Refinery of Australia's Mount Aisa, known as the Isa (ISA) electrolysis method; the electrolytic copper produced by the ISA method currently accounts for the world. One third of the output. The earliest introduction of this technology in China is the Jiangxi Copper Guixi Smelter.

In 1986, Canada's Eagle Bridge Company's Kidd Creek smelter also developed another stainless steel cathode production process, becoming the Kidd method. This process is adopted by Jinlong Company of Tongling, China.

The OT method is another stainless steel cathode production process developed by Outokumpu in Finland in recent years. This process is adopted by Shandong Yanggu Xiangguang Copper Company of China.

EPCM has been manufacturing stainless steel cathodes for more than 20 years. The company was founded in 1980 and was the first to supply cathode plates to Canadian Eagle Bridge, the manufacturer of the Kidd method. Since Eagle Bridge was acquired by XSTRATA in 2006, the two parties failed to reach a cooperation agreement and terminated cooperation in 2007. So began to independently develop the EPCM process, including high-performance cathode plates (SP) and robotic stripping units.

ISA method, Kidd method and OT method each have their own characteristics, but the performance of ISA method in a domestic factory is not ideal. For example, the quality of the "V" groove processing at the bottom of the cathode plate leads to poor stripping effect, which affects the processing capacity of the stripping unit. The cathode plate has a short service life. After the production is completed for 20 months, all the edge strips have been replaced, which is time consuming and labor intensive. The Kidd method has obvious advantages in the development of the cathode stripping unit and the invention and utilization of the "V" type tank.

Mainly due to the difference in cathode material and design structure, the difference between the method and technology of cathode copper stripping and the equipment unit. In fact, these three kinds of stainless steel technologies are similar in general, each has its own merits. The inventor of V-groove is KIDD, which is actually EPCM. At present, Cobra is a subsidiary of EPCM and is the sole manufacturer of KIDD technology. So far, COBRA is still the only factory in the world with experience in manufacturing KDOD process HP cathode. It only has equipment production technology and electroless copper production technology. ISA electrolysis technology should be relatively mature, with many years of production experience, and continuous innovation in the process, but the breakthrough on the cathode plate is not big. Now ISA and KIDD belong to the Chaoda Group. They should complement each other. Now the ISA copper plating layer is from 2.5mm to 3.0mm, and the copper plating on the board surface is also increased to 55mm. The resistivity is greatly reduced. In order to know the details, the three companies must send their respective relevant information to compare. At present, Jiangxi Copper uses ISA technology, Shandong Xiangguang Copper uses OT, and Jinlong Copper uses KIDD technology.

In fact, the permanent stainless steel cathode technology only has three process technologies: ISA, KIDD and OT. All three have complete electrolysis technology and related supporting equipment manufacturers. In 2002, Chaoda Group merged with MIM Company and owned ISA technology. The company merged with Eagle Bridge and owned KIDD technology. EPCM was a supplier of cathode plates and stripping units for KIDD technology before 2006. Eagle Bridge was acquired after EPCM was independent and currently has the world's largest cathode plate manufacturer. Cobra is a subsidiary of EPCM and the sole manufacturer of the KIDD process. To date, COBRA is still the only factory in the world with experience in manufacturing KDOD process HP cathodes. It only has equipment production technology and electroless copper production process technology.

    ISA, KIDD, OT are mainly different between cathode plate and cathode stripping unit. The difference between cathode plate and main electrode is mainly in the form of conductive rod. ISA adopts 304L stainless steel rod, and the section is hollow rectangular (or cross-section is I-shaped). The thickness of the copper layer is 2.5mm. Now the thickness of the copper plated layer of the BR cathode plate is 3.0mm. The coating covers all the welds and extends to the surface of the cathode plate at 55mm. The resistivity is the lowest. The stainless steel edge opens the small hole and is coated with polymer glue, and the edge strip and the surface of the board are adhered by glue, and the clip is stuck at the opening. ISA2000 technology uses a v-groove. KIDD uses a solid pure copper rod, the copper rod part is tightly wrapped with a stainless steel sleeve, and the strength is high; the stainless steel plate and the copper rod are welded with copper solder; the gap between the stainless steel sleeve and the copper weld is sealed with a sealant. Inventor of the V-shaped groove. The polypropylene material is die cast and heat treated. Then, it is processed into a groove shape on both sides, and the stainless steel plate is stuck on one side, and the polypropylene rod is inserted on the other side to increase the clamping force, and a layer of tape is adhered between the edge strip and the stainless steel. The conductive rod device of the OT cathode plate is a solid copper rod inside, and the outside is stainless steel. The lower part of the conductive rod exposes copper to make contact with the conductive bar between the slots, and the welding between the lifting lug and the board surface is laser-proof, and the corrosion resistance is strong. Outotec uses a grooved double-contact conductive row. There is a wireless transmitting device in the middle of each of the two slots, which can transmit information such as voltage, short circuit, temperature and current to the control center. The OT stainless steel edge opens the small hole, and the edging strip and the board surface are mechanically adhered and melted and extruded. Disadvantages: The edges are prone to long copper particles, and the copper sheets are not aligned. ISA stripping uses traditional mechanical techniques. KIDD stripping uses a robotic system. OT stripping uses traditional mechanical techniques.