Basic Introduction

• Composition: It is mainly composed of three parts: the plasma gun, the furnace body, and the DC power supply. The plasma gun is composed of a water-cooled copper nozzle and a water-cooled cerium-tungsten rod electrode. The furnace body is similar to an ordinary electric arc furnace, including a water-cooled furnace cover, furnace walls and furnace bottom built with refractory materials, and is also equipped with a furnace door and a tapping groove. A conductive bottom anode is buried at the furnace bottom to form a conductive loop.
• Working Principle: First, a DC voltage is applied between the cathode and the nozzle, and then argon is introduced. A high-frequency igniter is used to strike an arc, ionizing the argon to generate a non-transfer arc. Then, a DC voltage is applied between the cathode and the bottom anode of the furnace, and the plasma gun is lowered to make the non-transfer arc approach the charge, generating a transfer arc. Once the transfer arc is formed, the non-transfer arc is extinguished.

Characteristics

• High Arc Temperature: The arc temperature can reach about 20,000 °C, which can melt refractory metals such as tungsten, molybdenum, niobium, zirconium, titanium and their alloys.
• Controllable Atmosphere: By selecting different working gases such as argon and nitrogen, the furnace atmosphere can be controlled to achieve special metallurgical effects, such as smelting nitrogen-containing austenitic stainless steel.
• Avoidance of Carbon Increase: The water-cooled metal plasma gun replaces the graphite electrode, avoiding the carbon increase of the molten steel by the electrode, which is suitable for the smelting of ultra-low carbon stainless steel.
• Good Refining Effect: The inert gas in the furnace is similar to the vacuum melting effect, and the gas content in the molten steel is low. At the same time, high-basicity slag can be formed, and the desulfurization effect is good.
• High Alloy Element Recovery Rate: The recovery rate of various alloy elements during the smelting process is significantly higher than that of ordinary electric arc furnaces, and the recovery rate of most elements is above 96%.

Technical Parameters of Plasma Direct Current Electric Arc Furnace

1. Core Power Supply Parameters

2. Plasma Gun Parameters

3. Furnace Body Structure Parameters

4. Metallurgical Performance Parameters

5. Auxiliary System Parameters

Application Fields

• Special Steel Smelting: It is used to produce high-quality special steels such as bearing steel, ultra-low carbon stainless steel, heat-resistant steel, high-speed tool steel, precision alloy, superalloy and electric heating alloy.
• Refractory Metal Melting: It can melt and refine refractory metals and their alloys.
• Metal Recycling: It can be used to recycle metals from waste metals, slag, smelting waste residue and other materials to achieve resource recycling.